2022 Commercial Product Catalog Bosch Thermotechnology is a leading source of high-quality heating and cooling systems, including tankless, point-of-use and electric water heaters, floor-standing and wall-hung boilers, Bosch and FHP geothermal, water-source and air-source heat pump systems as well as controls and accessories for every product line.
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COMMERCIAL WSHP PRODUCT PORTFOLIO Water-to-Air LM
LM Splits
ES
EP
QV
$$$
$$$
$$$-
$$
$+
Water-to-Water LV
CA
EC
MC
WT
WW
$
$
$$
$$
$$
$$
Product
Price 007
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009
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012
✓
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015
✓
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018
✓
✓
✓
024
✓
✓
025 030 Model Sizes <6 Ton
✓
✓
✓ ✓
✓
✓
✓
✓ ✓
✓
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049
✓
✓
✓
✓
✓
✓
✓ ✓
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061 070
✓ ✓
042
060
✓
✓
041
048
✓
✓
035 036
✓
✓ ✓
✓
✓
✓ ✓
✓ ✓
071
✓
✓
✓
072
✓
096
✓
120
✓
✓
122
Model Sizes >6 Ton
✓
150
✓
151
✓
180
✓
181
✓
210
✓
✓ ✓
240
✓
300
✓
360
✓
✓
✓
✓
420
Capacities (WLHP)
2
✓
480
✓
600
✓
720
✓
EER
14.1-19.9
13.9-18.2
13.2-17.1
14.2-17.2
13.9-15.1
12.2-14.9
12.2-13.5
13.0-16.0
18.6-19
12.3-14.7
11.7-13.8
COP
4.8-6.5
4.8-6.0
4.4-5.4
4.8-5.8
4.4-5.2
4.3-5.1
4.3-5.1
4.2-5.6
5.4-5.5
4.1-4.6
4.2-4.6
PRODUCT BROCHURE
LM LM
SPLIT
ES
EC MC EP
▶ 2 to 6 ton capacities ▶ Two Stage High Efficiency ▶ Passive Dehumidification standard ▶ Standard ECM Constant Air (Variable Speed) blower motors
▶ 2 to 6 ton capacities ▶ Two Stage Ultra Efficiency ▶ Standard ECM Constant Air (Variable Speed) blower motors ▶ New consolidated product offering
▶ 2 to 6 ton capacities ▶ Two stage high efficiency ▶ Excellent replacement product for high-rises and condominiums ▶ Standard ECM Constant Air (Variable Speed) blower motors on all sizes
▶ 6 to 30 ton capacities ▶ Two Stage Compact Cabinet ▶ Improved scroll compressors on sizes 072 & 096 ▶ Single blower high static pressure capabilities ▶ 30 to 60 ton capacities ▶ Available in modular construction make it a great replacement for packaged floor-by-floor units (no breaking of refrigerant lines)
▶ Variable air volume and 100% outside air capability(4) ▶ High efficiency Scroll Compressors with multiple independent refrigeration circuits
▶ ½ to 6 ton capacities ▶ Single stage high efficiency ▶ Optional Electric heat and heat recovery features ▶ Optional ECM constant torque blower motors
QV
▶ 2 to 6 ton capacities ▶ Single stage ultra compact cabinet ▶ Sound levels as low as 53dB ▶ Option rich features and components
LV
▶ ½ to 6 ton capacities ▶ Single stage ultra compact cabinet ▶ New and improved rotary & scroll compressors ▶ Option rich features and components
CA WT
INN
O
Bosc VATIV E h-pa tente Sou d Atte nd nuat Syste ion m
Bosch QV Product Video Scan or Click QR
▶ ¾ to 11/2 ton capacities ▶ Quiet and compact design ▶ Optional motorized outdoor air damper ▶ Optional 63” cabinet for third party valves & pumps ▶ 2 to 6 ton capacities ▶ Quiet and compact design ▶ Excellent option for hydronic floor/baseboard heating,hydronic forced air fan coil heating/cooling, ice and snow melting, and swimming pool/spa heating
▶ The industry’s first two stage reverse cycle chiller water heater
WW
▶ 10 to 35 ton capacities ▶ Modular design gives you the flexibility to install units individually or in any combination ▶ Single or Two Stage Scroll Compressors ▶ Geothermal ready
Scan or Click
3
MODEL FEATURES - SUMMARY Water-to-Air Product Features
Water-to-Water
LM
LM Splits
ES
EP
QV
LV
VT Cabinet
X
X
X
X
X
X
HZ Cabinet
X
X
X
X
X
X
X
X
O
O
O
X
O
O
X
X
X
X
X
CF Cabinet X
X
X
WW
X X
X
X X
X
Single Stage High Efficiency
X X
Single Stage Compact Rotary Compressor
X X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
208-230/60/1 Voltage
X
X
X
X
X
X
X
265-277/60/1 Voltage
X
X
X
X
X
X
208-230/60/3 Voltage
X
X
X
X
X
X
X
X
X
460/60/3 Voltage
X
X
X
X
X
X
X
X
X
X
X
X
115/60/1 Voltage
X
PSC Fan Motor ECM Constant Torque (CT) Fan Motor
X
ECM Constant Air (CA) Fan Motor
O
X
X
X
X
X
O
O
O
ECM DecStar EON
X
X
X
X
X
X
X
X
X
X
Total Enclosed Fan Cooled (TEFC)
X
X
Variable Frequency Drive (VFD)
O
O
X
X
Uncoated Air Coil
X
X
575/60/3 Voltage
X
X
X
X
X
X
Epoxy Coated Air Coil
X
Tin Plated Air Coil
O
DuoGuard Air Coil
O
Factory Installed Electric Heat
O
O
O
O
1.5# Dual Density Fiberglass Insulation
X
X
X
1.5# Dual Density Fiberglass Insulation + EQ
O
Closed Cell Foam Insulation
O
Closed Cell Foam Insulation + EQ
O
O
O
O
O
X
X
X
O
O
O
O
O
O
O
O
O
O
O
O
X
X
Whisper Quiet Package
O
X
X
X
O
O
O
X
Double Isolated Compressor Insulation
X
X
X
X
X
X
X
X
EMS Relay
O
O
O
O
O
O
O
O
O
O
Blower Monitor Relay
O
O
O
O
O
O
O
O
Compressor Monitor Relay
O
O
O
O
O
O
O
O
O
O
Phase Monitor
O
O
O
O
O
O
O
O
O
Pump/Valve Relay
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
X
X
X
X
X
X
X
X
X
X
X
Boilerless Control Flow Proving Switch (DPS)
O
O
O
O
O
Disconnect Switch
O
O
O
O
O
O
O
O
O
X
X
X
X
X
X
X
X
X
X
X
X
X
Fire Alarm Relay/Dual Point Power Wire to 208V
X
Fire Alarm Relay/Dual Point Power Wire to 208V X = Standard, O = Option
4
X
WT
X
Two Stage Compact
Scroll Compressor
MC
X O
TXV Application Two Stage High Efficiency
EC
X
CS Cabinet Geothermal (Extended Range) + TXV
CA
X
O
O X X
Water-to-Air Product Features
Comfort Alert Module
LM
LM Splits
O
ES
EP
O
O
QV
Water-to-Water LV
CA
MC
WT
WW
O
Outside Air Damper
O
SmartStart Assist
O
Hot Gas Reheat - ON/OFF
O
O
O
O
Hot Gas Bypass
O
O
O
Straight Cool
O
O
O
Heat Recovery Package
O
O
Modulating Hot Gas Reheat
O
X
X
Transformer - 50VA
X
X X
X
Transformer - 100VA
O
O
O
O
O
O
O
O
O
O
Transformer - 40VA Transformer - 75VA
EC
X
X
X
X
X
O
O
O
O
O
X X
X X
O
X
Unit Protection Module (UPM)
X
X
X
X
X
X
X
X
X
X
X
DDC - Multi-Protocol (BacNET, N2, ModBus)
O
O
O
O
O
O
O
O
O
O
O
DDC - LonWorks
O
O
O
O
O
O
O
O
O
O
DDC - Multi-Protocol w/ Expander
O
O
O
Inverter Drive
O
O
DDC - Multi-Protocol w/ Inverter
O
O
DDC - Multi-Protocol w/ Inverter & Expander
O
DDC - LonWorks w/ Inverter
O
DDC - LonWorks w/ Inverter and Expander
O
2-Way Solenoid Valve
O
O
O
O
O
O
O
X
O
O
O
O
O
O
O
MeasureFlow (Automatic Flow Valve) Water Regulating Valve Connection (Schrader) Circulating Pump
O
X
O
O
O
O
O
X
X
O
Waterside Economizer 1/2" FPT Water IN/OUT Fittings
O
Hot Water Coil
O*
1" Standard Throwaway w/ 2 Sided Filter Rack
X
1" Standard Throwaway w/ 4 Sided Filter Rack
X
MERV 8, 2" Filter with 4 Sided Filter Rack
O
MERV 13, 2" Filter with 4 Sided Filter Rack
O
O
X
X
X
O
O
O
O
O
O
O
O
X X
Cleanable Mesh Filter
X
2" Filter Rack with 1" Filter
X
4" Pleated Filter
X
2" Filter Rack with No Filter
X
4" Pleated Filter
S Field Install Kits
Internally Mounted Electric Heat Kit
O
O
O
SmartStart Relay Kit
O
O
O
O
O
O
Pump/Valve Relay Kit
O
O
O
O
O
O
O
O
O
O
O
Stainless Steel Hose Kits
O
O
O
O
O
O
O
O
O
O
O
Flow Proving Switch (DPS)
O
O
O
O
O
O
O
O
O
O
Comfort Alert Module Horizontal Discharge Air Conversion Kit
O
O O
Field Convertible Discharge Air Conversion
O
O
O
O
Flow Center Kits
O
O
O
O
O
O
Duct Mounted Electric Heat Kit
O
O
O
O
O
O
O
O
X = Standard, O = Option
5
MODEL NOMENCLATURE HOW TO READ A MODEL CODE-STRING In the past an A/C unit was identified only by the model and configuration. FOR EXAMPLE
LM024-1VTN-FRT Units with the same model number can be very different from each other depending on the options that were included. We have modified the code string to describe exactly the model, size and all of the options that may have been ordered with that unit. Each digit in the code string refers to a specific characteristic or option on a unit. In this way the code string is unique to the specific unit, unless identical units are ordered. The code string will be listed on the unit data plate so it is possible to identify what is in the unit without having to remove panels to physically identify what is installed. We have structured the code string so that every position in the code string for different units refers to the same option. This makes it easier to recognize if a specific option is included.
CODE STRING EXAMPLE
LM 024 - 1 V T N-FRT T TA-AHGAENHXX7XXXX8XXXXSSA 1-2 3-5 6 7 8-9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 X
X
X
X
8
X
X
X
X OPEN
S
B
A CODE STRING LEVEL
7
SPECIAL
X
OPEN
X
BLOWER PULLEY
H
MOTOR HP
N
FILTRATION
E
OPEN
REVISION LEVEL
A
ECONOMIZER
AIR COIL
H G
WATER FLOW CONTROL
FAN/MOTOR OPTIONS
A
WATER FLOW CONTROL OPTIONS
DISCHARGE AIR CONFIGURATION
-
TRANSFORMER
A
REFRIGERATION CIRCUIT OPTIONS
T
GENERAL ELECTRICAL OPTIONS
T
APPLICATION
T
CABINET CONSTRUCTION
R
ELECTRIC HEAT (SINGLE POINT)
F
RETURN AIR CONFIGURATION
-
WATER CONNECTIONS
COAX OPTIONS
CABINET CONFIGURATION
VOLTAGE
SIZE
N
MODEL
6
LM 024 - 1 VT
CODE STRING INTERPRETER OPTION
CODE STRING #
CODE
DESCRIPTION
Unit Series
1-2
Series
Unit nominal size
3-5
LV 007 009 .. 720 0 1 2 3 4 5 HZ VT CF UL UR RL RR CS AH AV C N F S B F L R T F R S E B P T A I B D U T D E A… X A C D E A C D F N W R S T T G
6
Voltage
7
Configuration
8-9
Coax Material
10
Water Connections
12
Return Air
13
Discharge Air
14
Fan Motor
15
Air Coil Material
16
11
Revision Level
17 18
Electric Heat
19
Cabinet
20
Cabinet
20
Application
21
Nominal capacity Separator 115/1/60 Voltage 208-230/1/60 Voltage 265/1/60 Voltage 208-230/3/60 Voltage 460/3/60 Voltage 575/3/60 Voltage Horizontal Vertical Downflow (ES/CE models only) Unit Mounted Control, Left Water (Console Series) Unit Mounted Control, Right Water (Console Series) Remote Thermostat Control, Left Water (Console Series) Remote Thermostat Control, Right Water (Console Series) Condensing Section (Splits) Horizontal Air Handler (Splits) Vertical Air Handler (Splits) Copper Cu-Ni Separator Front Side Back Front Left Right Top Front Rear Straight Through End Blow Bottom PSC Motor Constant Torque ECM Constant Air Flow ECM Inverter Duty Belt Drive ECM DEC Star EON Uncoated Tin-Plated DuoGuard Epoxy Coated (Console Series) Revision level of the product Separator None 5 kW 10 kW 15 kW 20 kW 1/2" Standard 1.5lb. Dual Density Fiberglass 1/2" Closed Cell Foam Insulation 1/2" Standard 1.5lb. Dual Density Fiberglass, Extra Quiet Compressor Blanket 1/2" Closed Cell Foam Insulation, Extra Quiet Compressor Blanket No Insulation (Outdoor Application CS only) Whisper Quiet Package Cabinet and Sub-base (Console Series) No Top Cabinet - Sub-base (Console Series) No Top Cabinet - No Sub-base (Console Series) TXV (Standard Range - Boiler/Tower) Geothermal (Extended Range)
7
CODE STRING INTERPRETER OPTION
CODE STRING #
DESCRIPTION None EMS relay Blower Monitor Relay Compressor Monitor Relay Phase Monitor Pump/valve relay Boilerless control Flow proving switch Disconnect Switch Fire Alarm Relay/Dual Power Wire to 208V Comfort Alert Diagnostic Module Start Assist Fault LED Outside Air Damper (Console Series) None Hot Gas Reheat, On/Off Hot Gas Reheat, Modulating Hot Gas Bypass Hot Gas Bypass w/ Hot Gas Reheat, On/Off Heat Recovery Package Straight Cool 40 VA 50 VA 75 VA 100 VA None Multi Protocol DDC (Modbus, BacNET, N2) LonWorks DDC Inverter DDC - Multi-Protocol with Inverter DDC - LonWorks with Inverter None 2 Way Solenoid Valve Automatic Flow Control Valve (AFV) (3 GPM/Ton) 2 Way Solenoid + AFV Circulating Pump 1/2" FPT Fittings (Console Series) None Economizer With 3 Way Valve and Controls None Standard 1" MERV-4 Filter w/ 1" 2-Sided Filter Rack MERV-8 - 2" w/ 4-Sided Filter Rack MERV-13 - 2" w/ 4-Sided Filter Rack Cleanable Mesh Filter (Console Series) None 1 1.5 2 3 5 None None None Standard Special Bosch Revision level of the code string
Blower Pulley Open Open
35 36 37
Special
38
Bosch Code String Revision
39
X A B C D E G H J K M N S T O X H M B C D S 4 5 7 1 X M L I J K X 2 3 4 5 F X E X 1 4 5 7 X A B C D E X X X S Y B
40
A
General Electrical Options
22-26
Refrigerant Circuit Options
27
Transformer
28
Controls
29
Water Flow Control
30
Economizer
31
Open
32
Filtration
33
Motor Sheave
Motor HP
8
CODE
34
ADVANTAGES OF FHP TECHNOLOGY
Quiet operation Energy Efficiency Space savings Superior quality
Flexibility and comfort Simplified installation Economical operating costs
BOSCH FHP EQUIPMENT
Specializing in efficient green technology for commercial heating and cooling products. FHP products are one of the leading Geothermal and Water Source heat pumps in the market, which assures that you are buying a unit that you can trust. Bosch Thermotechnology Corp. is dedicated to providing highly efficient heating and cooling solutions to the private and public sectors. Bosch Thermotechnology Corp. is always on the forefront of product development and innovative design to optimize the performance of FHP units. Our products are designed and manufactured to the highest quality, reflecting the nocompromise standards for which FHP and Bosch are renowned in order to provide our customers with the highest level of satisfaction and comfort. The variety of options, energy efficiency, and uncompromising quality of all FHP products makes them the ideal choice for the commercial new construction market and the ease of designing into tight retrofit spaces of buildings.
CABINET FEATURES, FUNCTIONS AND BENEFITS
The unit cabinetry is constructed using heavy-gauge, galvanized steel. This steel provides superior corrosion protection for units located indoors. Console units consists of three main components: the cabinet, sub-base and the chassis. The slope-top style, single piece cabinetry is constructed with heavy-gauge “paint-grip” galvanized steel and finished with Powder coat beige paint finish. This allows for that professional appearance that is known from FHP products. The cabinet is mounted onto the sub-base and secured with metal screws for security. In addition, the subbase has a bracket that may be secured to the wall to provide stability. The sub-base is constructed of heavy gauge painted steel. The chassis is of compact design and of the same dimensions for all model sizes. Both the compressor and coil compartments are thermally and acoustically insulated, and have removable steel cover plates giving double acoustical protection between the two compartments.
A A B
B
D
C E
COPPER TUBES / ALUMINUM FINNED HX - STANDARD DuoGuard Protective Coating w/Tin Plating – Tin Plated Hair Pins w/Al Fins & Cu tubes - option on ES CONSTANT TOQUE X13 (ECM) BLOWER Constant Air Flow (ECM) as option, Removable Blower housing (with removeable inlet ring)
C
COAXIAL REFRIGERANT-TO-WATER HX Copper/Cupro-Nickel Insulated option for Geothermal application
D
SINGLE STAGE ROTARY/SCROLL COMPRESSOR Ultra Tech 2-Stage Scroll Compressor Compressor Blanked as option
E
UNIT PROTECTION MODULE Solid State Safety Control Circuit with multiple features (anti-short, time delay, random start, brownout, pressure, condensate, freeze, alarm) 9
UNIT CONFIGURATIONS WATER-TO-AIR UNITS VERTICAL (VT) The cabinet is designed in such a way as to be able to be installed in a narrow space such as a closet, basement, or utility room. The return air duct is either mounted on the left or right hand side of the cabinet and the supply air is discharged from the top. HORIZONTAL (HZ) The cabinet is designed in such a way as to be able to be installed in a ceiling, attic, or crawlspace. The return air duct is either mounted on the left or right hand side of the cabinet and the supply air is either discharged end or straight through. COUNTERFLOW (CF) The cabinet is designed in such a way as to be able to be installed in a narrow space such as a closet, basement, or utility room. The return air duct is either mounted on the left or right hand side of the cabinet and the supply air is discharged from the bottom.(*) CONDENSING SECTION (CS) The cabinet is designed in such a way as to be able to be installed in any small space and away from any noise concerned occupants. The CS unit contains major components such as the compressor and water coil. AIR HANDLER SECTION (AH) The cabinet is designed in such a way as to be able to be installed in any small space. The AH unit contains major components such as the blower fan and air coil. The return air duct is either mounted on the left or right hand side of the cabinet and the supply air is either discharged top (AVX), end (AHX), or straight through (AHX). CONSOLE (CA MODELS ONLY) The cabinet is designed in such a way as to be able to be installed underneath windows, in classrooms or stairwells. The return air duct is located on the bottom front part of the unit and the discharge air is discharged top. The unit can be configured with either a Unit Mounted Controller (UL or UR) or Remote Thermostat (RL or RR). The water supply/return locations are located on either the right or left hand side of the unit. and typically on the same side as the Unit Mounted Controller, or the Remote Thermostat connection location *Only offered on the ES units
10
VERTICAL HIGH CONFIGURATION (HIGH-BOY) The VH design concept is to provide a unit that will facilitate on site handling and can be installed in locations difficult to access. All units can be broken down into separate sections that can pass through a 36” wide standard size door or service elevator. The MC360 ships in two sections and can be easily broken down into three separate sections; the fan section, main heating/ cooling section and the economizer/filter bank section. The MC480 through MC720 ships in four sections and can be broken into six separate sections, two each as previously mentioned. Very few competitive equipment manufacturers have this capability. VERTICAL LOW CONFIGURATION (LOW-BOY) The VL is designed for those applications where there is a restriction in the height of the unit. In this unit the blower is dropped into the main coil section reducing the unit’s overall height and increasing unit depth. The MC360 ships in one section and can be separated into two sections, the main refrigeration and blower sections and the filter/ economizer section. Unit sizes MC480 through MC720 ships in two sections and can be separated into four sections for transportation and access into the plant room.
WATER-TO-WATER UNITS
The cabinet is designed in such a way as to be able to be installed in any space. The Unit Mounted Controlled Units (US) and Remote Controlled (CS) units give the end user options to either have the unit controlled locally or through a remote control. The US and CS units contain major components such as the compressor, source side water coil, and load side water coil.
THE CABINET INSULATION
All interior surfaces are lined with 1/2” thick, 1.5 lb./ cu.ft. density, Micromat (dual density) or closed cell foam insulation for thermal insulation and acoustical attenuation. This insulation is non-combustible, nonhydroscopic and does not support fungal growth. Insulation meets NFPA 90A and 90B for fire protection and is certified to meet the GREENGUARD®Indoor Air Quality Standard for Low Emitting Products. Protection against corrosion is a feature in the unit.
STAINLESS STEEL DRAIN PAN
A stainless steel drain pan will last the lifetime of the unit and resist corrosion and cracking that may occur with steel or plastic materials.
TAKE-APART CONSTRUCTION (EC AND MC MODELS ONLY) To make installations possible into buildings where all that is available are standard-sized doorways and elevators, the take-apart special option is the natural choice. This type of unit is shipped fully assembled with the air handling and condensing sections capable of being field-separated for rigging into the space. The refrigerant circuit is separated into two parts, capped, sealed tight, and charged with nitrogen. The installer will be responsible for reassembling the sections, connecting the refrigerant circuit, charging the unit and wiring the unit motor. Allow for an increase of 3” of height on top of catalog dimensions. For MC models, the modules come apart without breaking the refrigerant circuit. The filter sections [filter section may include (optional) Economizer] can be detached in the field so that you can fit the disassembled sections through a door width of 47” or greater on the Vertical Low Configuration (VL) or 33” or greater on Vertical High Configuration (VH). Designed with ease of assembly in mind, the unit comes with bolts to bolt the sections together, unions for the water connections, and the refrigeration circuit remains intact during disassembly / assembly.
BOSCH WSHP OFFER THE QUIETEST COMFORT & OPTIMAL EFFICIENCY SOUND ATTENUATION
Noise is a topic which plays a major role in any HVAC system yet it is a topic which is either misunderstood or not very well understood in the HVAC world. Too much sound or unwanted sound can create SEE THE BOSCH unpleasant living conditions and the end THERMOTECHNOLOGY users prioritize the value of quieter HVAC SOUND TESTING LABS system. Bosch addresses the issue by isolating and insulating the loudest components in the Water source heat pump system.
COMPRESSOR ENCAPSULATION
In our QV model, we offer the Bosch-patented compressor encapsulation where the compressor is isolated from the rest of the unit. In addition, the Mass Loaded Vinyl insulation is added to compressor encapsulation, which dampens the unwanted noise by eliminating vibration transmission to the cabinet. The Mass Loaded Vinyl is a heavy duty material which absorbs the sound energy better than other standard attenuation options currently available in the market.
OTHER SOUND ATTENUATION OPTIONS
Bosch also offers sound attenuation option for the other WSHP models as well. Most of our units have a distinct floating base pan; the compressor is mounted on a heavy steel plate which rests on a high density rubber pad on the base of the unit. In addition, compressors are mounted on rubber grommets and have double isolation. This is standard in all units preventing vibration and noise transmission from the compressor to the unit structure, resulting in exceptionally quiet operation. Units offer optional closed cell foam insulation to help aid indoor air quality (IAQ) and to further attenuate low frequency noise from the compressor compartment. The closed cell foam insulation option is available in all unit sizes. For additional sound attenuation, an optional compressor blanket is available.
SERVICEABILITY
All units are designed to be serviced from the front. Schrader valves for high and low pressure gauges and the electrical box components are easily accessible for diagnosing and servicing the unit. Insulated bulkheads in all units, separate the compressor section from the blower section, allowing the unit to be serviced during operation. Large removable panels aid in servicing the unit, when necessary. Separate electrical knockouts in the unit corner post allow for easy and safe routing of high and low voltage lines to the inside of the cabinet.
11
FILTER RACKS AND OPTIONS
Units come standard with a 1” filter rack and construction filter. A 2” four-sided filter rack and pleated filter is optional and greatly improves air filtration. Filter doors allow for easy routine maintenance and changing of the air filter. A 1” return duct collar is integral to the filter rack eliminating the need for field mounted duct collars. Every CA model comes with a washable, reusable mesh-filter that provides air filtration from the base of the console.
MERV-8 AND MERV-13 FILTERS
The optional 2” MERV-8 or -13 filter is most advantageous for premium air filtration on commercial HVAC projects. High efficiency filtration with 2” of filter material is a cost-effective way of upgrading air quality while maintaining low pressure drop and sustaining long service life. These filters effectively remove up to 98% of airborne matter, such as fine particulates, bacteria, smoke, gases and allergens including dust mites, pollen, mold spores, dust and smog. MERV-8 and MERV-13 rated filters are a minimum requirement for EQ credits 3.1 and 5 on LEED projects. With the standard ECM constant airflow motor the Bosch units are prepared to handle higher external pressure drops when utilizing the higher efficiency MERV13 filters.
FAN MOTOR
Bosch provides several fan motor options for water to- air units. PERMANENT SPLIT CAPACITOR MOTORS (PSC) The standard motor for all LV sizes and EP units 1 ton and under is a PSC motor. For all models other than 575 V units, the supplied motor is a three speed motor. 575 V motors are single speed. ECM CONSTANT TORQUE MOTOR The ECM Constant Torque (ECM CT) blower motor option offers improved efficiency (up to 33%) over the standard 12
PSC motor. This motor is similar in function to a PSC, but can handle up to 1 in.w.g. external static pressure making it a wise choice for high filtration applications. These motors are available in unit sizes 015 to 070. This ECM motor option is an excellent choice for retrofit. The constanttorque motors do not require a neutral wire for 460/3 power. ECM CONSTANT AIRFLOW MOTOR The high efficiency ECM Constant Airflow or CFM (ECM CA) motor option, available in 1/3hp to 1hp, provides constant airflow in a wide static pressure range up to 1 in.w.g. Available in unit sizes 015 to 070, this motor is a great choice in high filtration applications, such as MERV-13, as well as high static conditions. The motor has a soft start/stop feature, keeping noise to a minimum. LV units outfitted with any ECM motor can see an efficiency boost with up to 1.8 additional points of EER. Passive dehumidification can be achieved with the constant airflow ECM by reducing nominal airflow by 15%. This control feature lowers air coil temperature and prevents over-cooling of the space when in dehumidification mode. IMPORTANT NOTE: The ECM CA requires a neutral wire in a 460V application. ECM DEC STAR® BLOWER In addition, the QV unit is equipped with a standard Constant Airflow ECM DEC Star® Blower. Highly efficient, the DEC Star® blower produces the same CFM as the QV but at a lower RPM, resulting in decreased power consumption, lower sound levels, and optimal sound performance. The DEC Star® blower’s high efficiency and improved airflow also keeps maintenance costs to a minimum. Finally, the Mass Loaded Vinyl insulation is added to compressor encapsulation as well to further dampen the noise. VARIABLE FREQUENCY DRIVE (VFD) On large water-to-air EC and MC units, the VFD option is available as a means to adjusting the airfl ow to any CFM value for ideal space conditioning.
WATER FLOW CONTROL
MOTOR HORSEPOWER OPTIONS On large water-to-air EC and MC models, several motor horsepower options are available. A 1, 1.5, 2, 3, and 5 HP motor option is available. Please see table below:
TWO-WAY SOLENOID VALVE
Motor Horsepower Options Motor Code and HP Model 72
A - 1.0 HP
B - 1.5 HP
C - 2.0 HP
D - 3.0 HP
E - 5.0 HP
VT/HZ
VT
VT
VT
VT
*
* *
96
HZ
HZ
HZ
120 150 151 180 181 210
HOSE KIT
*
240 242 300 360
* Not available with VFD,
Standard Feature,
Optional Feature
HANGING BRACKETS
All horizontal units come standard with hanging bracket kits for suspending the unit from field supplied hanger rods (not available on CA, EC, MC, WT, WW models). These kits include heavy-duty steel brackets and rubber grommets for sound and vibration isolation from the building structure.
WATER CONNECTION
The water connection is a front configured heavy duty bronze FPT fitting securely fastened to the unit corner post. This allows connecting to a flexible hose kit without the use of a backup wrench making for easier, faster installation.
COMPRESSORS
HZ
The two-position motorized water valve is optional on all unit sizes and is a great energy savings option. The valve opens to allow 100% fluid flow through the coaxial heat exchanger only when there is a call for cooling or heating. Closing off fluid flow to the unit when there is no call for cooling or heating reduces system operating costs, when using variable speed pumping, by reducing the speed of the primary loop pumps. The valve may also help during field service situations when many units are connected to the common water loop.
Bosch offers two compressors: Rotary and Scroll. Rotary compressors are supplied on capacities 007-018 and on all CA models. On sizes larger than 024 and up, heavy duty and high efficient scroll compressors are standard.
The MeasureFlow option provides a hose kit with an Automatic Flow Valve (AFV) or hose kit, Y-strainer, and Blow Down Valve (BDV). The AFV has a design flow rate preset at the factory per the design conditions and will automatically limit the flow to this value. This will greatly facilitate balancing of the fluid loop and ensuring each unit gets the required flow. The BDV allows for purging of the loop on the supply side. The filter screen is 20 mesh, 304 stainless steel to help prevent dirt and debris from entering the water coil.
AUTOMATIC FLOW CONTROL VALVE (AFV)
A factory mounted Automatic Water Flow Valve that is set to 3 GPM/nominal ton of cooling. Simplifies flow balancing of large systems by setting each unit to an optimal flow rate. Flow cartridges are field changeable. If a hose kit is selected with an AFV, then the internal AFV would be redundant.
TWO-WAY SOLENOID VALVE + AUTOMATIC FLOW VALVE
Includes the two-position motorized water valve (24V) as an option (with 300 psig working pressure) and MeasureFlow. This could be used to shut off flow to the unit when there is not a call for heating or cooling. A typical application would be with VFD pumping.
WATER REGULATING VALVE CONNECTION
The water regulating valve connection includes a Schrader valve port which is used for servicing and charging refrigerant.
13
REFRIGERANT CIRCUIT
Units are designed using the optimum combination of compressor, water and air coils to provide peak performance. Units are rated to withstand 600 PSIG working refrigerant pressure and 400 PSIG working water pressure. Heavy-duty heat pump compressors are used in all units. Rotary and scroll compressors offer optimum performance for each unit size. Refrigerant to water heat exchangers are coaxial tube-intube type providing a robust construction, ensuring years of trouble free operation. Coaxial coils are selected and designed for peak performance, offering the best combination of low water pressure drop and maximum heat transfer in both the cooling and heating modes. Standard coaxial coils have a copper interior water tube and a steel outer shell. Optional Cupro-Nickel coils are available for applications where the water is of lower quality. In geothermal applications where fluid temperatures can drop below the dew point of the surrounding air, optional insulation is available to prevent water coils and refrigerant piping from sweating. Air side refrigerant coils have copper tubes, aluminum fins and side plates to prevent corrosion. Air coils are state of the art, employing lanced fin and rifled tubing for maximum heat transfer. Large face areas result in lower face velocity reducing sound while ensuring high latent heat removal for maximum dehumidification in the cooling mode. A pilot operated four-way reversing valve in the refrigeration circuit allows the unit to operate in either the heating or cooling mode. All FHP units have the reversing valve energized in cooling mode. This will ensure you are not left without heat in the middle of winter, should the reversing valve coil fail. Refrigerant flow to the air coil is metered by Thermal Expansion Valves (TXV) as standard in all units. TXV’s are designed to vary the flow of refrigerant depending on the load. TXV’s provide unit optimization and a more stable control over a wider range of operating conditions while assuring proper refrigerant level in the operating evaporator.
REFRIGERANT FLOW PATH
14
Equalizer Line Oil Return Bleed Line
Check Valve Sub-Assembly
Expansion Valve
Liquid Line
Air Flow
Evaporator Coil
Distributor
Reheat Coil
A hot gas reheat valve and a reheat coil are included in the refrigerant circuit. The refrigerant circuit in the cooling and heating mode is identical to a standard heat pump. In the reheat mode, the compressor discharge gas is diverted through the reheat valve to the reheat coil which is located downstream of the cooling coil. The superheated refrigerant gas reheats the air leaving the cooling coil. The hot refrigerant gas then passes though the water to refrigerant coil where it is condensed to a liquid. From this point the rest of the cooling cycle is completed as in a regular heat pump. There are two check valves to prevent refrigerant flow into the reheat coil during standard cooling/heating cycles. A small copper bleeder line is connected to the outlet line of the reheat coil and between the expansion valve outlet and distributor to the air coil. This line is necessary to let any liquid/ oil that may have migrated to the reheat coil during reheat to escape during standard cooling/heating modes.
Water
Condenser Coil
Air Flow
Reversing Valve Bypass Regulator
TXV Sensing Bulb
Equalizer Line
Hot Gas Line
Hot Gas Reheat Compressor Suction In Discharge Out
HOT GAS REHEAT - ON/OFF
Hot gas reheat (HGR) allows the user to not only control space temperature, but also humidity levels within the conditioned space. Excessive moisture in the space can promote mold growth leading to damage in the structure or interior surfaces, as well as reducing the air quality and creating an unhealthy environment. Possible causes of excess humidity could be a byproduct of the unit having to operate under a widely varying load, an oversized short cycling unit, a high percentage of unconditioned outside air being introduced into the space, a high latent load in the space or any location where humidity infiltration is a problem. Typical unit control is by a wall mounted thermostat that senses temperature in the occupied space. By utilizing a humidistat in addition to the thermostat, LV units with Hot Gas Reheat are able to control the humidity levels in the space as well. The Hot Gas Reheat option allows cooling and dehumidification to satisfy both the thermostat and humidistat while preventing over-cooling of the space while in the dehumidification mode. Once the thermostat reaches set point temperature, the humidity is above set point, the unit controller will energize the reheat valve operating the unit in hot gas reheat mode, first cooling and dehumidifying, then reheating the air (using hot refrigerant gas) before delivering it to the space, usually 2° to 5°F below room temperature. The unit operates like a dehumidifier by reheating the air along a constant sensible heat line, while the relative humidity of the leaving air is reduced. This option offers significant energy savings over reheating air with electric heating coils. The moisture removal capacity of a specific heat pump is determined by the unit latent capacity rating. A heat pump’s latent capacity can be determined by reviewing the heat pump specification data sheets. Depending upon the entering water and air conditions, a total and sensible capacity can be interpolated from the data sheets. Subtracting sensible capacity from total capacity yields latent capacity. Dividing the latent capacity by 1069 converts the amount of moisture removal from BTU/Hr. to Pounds Per/Hr.
(Note: The reheat mode always operates in the cooling mode.) Should the temperature in the space increase above set point, the compressor terminal Y is energized, which will de-energize the reheat valve putting the unit into straight cooling mode. A call for cooling or heating will always take precedence over hot gas reheat.
HOT GAS REHEAT CONTROL OPTIONS
There are several ways to control heat pumps with hot gas reheat. You should choose the means that best suits your specific application. Please refer to the Hot Gas Reheat wiring diagrams for typical thermostat wiring. Most heat pump compatible thermostats in conjunction with a humidistat are acceptable for use. (Note: “O” output for reversing valve energized in cooling mode is required.) Combination thermostat/humidistats are also available.
MODULATING HOT GAS REHEAT (MHGRH)
Modulating Hot Gas Reheat differs from On/Off in that the reheat function is always active. The purpose of Modulating Hot Gas Reheat is to deliver supply air at or close to neutral conditions. Air is cooled and dehumidified by the cooling coil to around 55°F DB/54°F WB. A sensor located in the supply air stream is set at the required leaving dry bulb temperature and will send a signal to the modulating hot gas reheat valve to direct the fl ow of hot gas to maintain that temperature. A typical application for this would be in treating 100% outside air. This air would be ducted directly into the space relieving the unit handling the zone of any outside air load. This can result in a smaller zone unit, less airflow and a savings in both initial and operating cost. Control of the hot gas modulation is by the DDC control logic via the sensor in the supply air duct or through a building management system. A separate controller is used to control the unit itself.
In the reheat mode, on a call from the humidistat, the reheat relay coil is energized through the “H” circuit. The cooling relay remains de-energized enabling the reheat solenoid. The blower relay, reversing valve and compressor contactor are energized through contacts on the reheat relay. 15
PSYCHROMETRIC CHART
85
85
85 W ET B
80
ULB 80 TEM PER
75
70
65
Lvg. Coil
55
80
70
65
60
65
%
Reheat
60
% 70
50
55
45
50%
50
40
50
25%
60%55
45
70
40
40%
45 40
15%
35
30%
35
30
MIDITY TIVE HU 8% RELA
20% 10% RELATIVE
25 20
6%
HUMIDITY
10 0
4%
2%
35
40
45
50
55
60
65
Chart by: HANDS DOWN SOFTWARE, www.handsdownsoftware.com
70
Some applications require special attention to maximize the performance of the hot gas reheat function: Low Temperature Well Water Indoor Pool Dehumidifying During Winter Months (Re: Heating Mode) Please consult with Bosch EAP for special application considerations.
The function of the hot gas bypass valve is to prevent icing of the air coil when the unit is operating at low cooling load conditions. This situation could arise if the space experiences widely different loads, for example a conference center or if a unit is sized for heating, it could be oversized for cooling. Without a hot gas bypass circuit the evaporating temperature could fall and ice could form on the coil restricting airflow and aggravating the situation. Eventually the heat pump could lock out on air coil freeze protection.
16
75
80
85
90
95
100
DRY BULB TEMPERATURE - °F
SPECIAL CONSIDERATIONS
HOT GAS BYPASS
DEW POINT TEMPERATURE - °F
75
Entering
% 90
°F
80
75
60
ATU RE -
The hot gas bypass valve located in the compressor discharge line diverts hot gas to the inlet of the air coil. The valve is factory set to open when the evaporating pressure falls to 90 PSI and will modulate to prevent the pressure falling any lower. This setting is field adjustable and this set point may be adjusted as required. The Hot Gas Bypass option is a freeze prevention device that routes hot refrigerant from the compressor directly to the evaporator (air) coil. This prevents the air coil from freezing in low load operation. The system consists of a bypass regulator, check valve, equalizer line, and T-union.
STRAIGHT COOL
The Straight Cool option allows for heat pump cooling only operation where the reversing valve is removed from the unit. These units are recommended for warm climate regions.
HEAT RECOVERY PACKAGE DESUPERHEATER
Hot water needs account for a large percentage of the energy a home or building consumes every year and Bosch customers know that our efficient technology can help support their hot water needs through the optional heat recovery package. With the Heat Recovery Package, you can have part of the system dedicated to your air conditioning and heating and another portion to supplement your current hot water heating system to meet the needs of the building.
EVAPORATOR (AIR) COIL The air coil provides either heat or cooling to the space occupants. It does this by channeling the superheated refrigerant gas (in heating mode) to the coil or liquid/ gas refrigerant mix (in cooling mode) to the coil. As the blower air from the blower moves over the coil, the hot/cold refrigerant heats/ cools the space.
Bosch air handling sections come standard with a copper tube aluminum fin evaporator coil as standard (uncoated). As an option, tin electro-plated copper tubing protection is available. This Tin-Plating option will protect the evaporator coil from most forms of corrosive elements in the airstream and adds life expectancy to the entire system. Another option is the DuoGuardTM coil coating which provides maximum protection against corrosive elements in the airstream including formicary corrosion. This coil coating includes tin electro-plated copper tubing + high-tech polymer coated aluminum fins. DuoGuardTM protected coils are able to exceed 1000 hours of salt spray as per ASTM standard B-117.
BLOWER HOUSING
A removable inlet ring is a standard feature of the blower housing on all unit sizes. The removable inlet ring helps facilitate motor removal without having to remove the fan housing from the cabinet greatly decreasing field service time.
UNIT PROTECTION MODULE
Each model is factory provided with a Unit Protection Module (UPM) that controls the unit operation and monitors the safety controls that protect the unit. The UPM interfaces with the thermostat or direct digital controller. The main purpose of the UPM is to protect the compressors by monitoring the different states of switches and sensors. This module provides time delays and protects the unit against freezing of the water to refrigerant and air to refrigerant heat exchangers as well as condensate overflow. STANDARD SAFETY CONTROLS INCLUDE:
High pressure switch located in the refrigerant discharge line. Low pressure switch located in the unit refrigerant suction line. Standard low fluid temperature (freeze) protection sensor. The freeze protection sensor, located on the refrigerant liquid line entering the coaxial heat exchanger, is designed to disable compressor operation when the unit is in the heating mode, should the refrigerant temperature fall below either 26°F (-6.6°C) or 15°F (-9.4°C). Condensate overflow protection sensor is standard and factory mounted in the drain pan of the unit. Low air coil temperature (freeze) protection sensor disables the compressor when the refrigerant entering the air coil drops below 30°F (-1.1°C).
UPM CONTROL BOARD FEATURES CONDENSATE OVERFLOW PROTECTION The UPM controller continuously monitors the drain pan for high condensate water level, and if this exceeds normal operating levels, the compressor operation is interrupted to protect against drain pan overflow. ANTI-SHORT CYCLE TIMER 5 minute delay on break timer to prevent compressor short cycling. RANDOM START Each controller has a unique random start delay ranging from 270 to 300 seconds after power is applied to the board. This will prevent the simultaneous start of multiple units after a power outage.
Note: *Not applicable for LM, LM Split CA, WW and WT Series
17
LOW PRESSURE BYPASS TIMER The low pressure switch is bypassed for 120 seconds after a call for compressor operation to prevent nuisance low pressure lockouts during cold start-up in the heating mode.
ADDITIONAL OPTIONS
BROWNOUT/SURGE/POWER PROTECTION Prevents compressor operation should the voltage drop below 10% of unit rated value. The unit will restart once the voltage is within tolerance and the random start has timed out.
BLOWER MONITOR RELAY This optional accessory allows for an output signal to a third party device to shut the fan in an emergency as well as to monitor operation. This relay senses low voltage 24VAC on G call. If the application is critical, a current sensor can be added as an ETO.
MALFUNCTION (ALARM) OUTPUT The controller has a set of contacts for remote fault indication. This can be either a steady output or can be set to pulse with the fault code. Two connections are available – one to provide a 24 volt output, the other to provide a dry contact.
COMPRESSOR MONITOR RELAY This optional accessory allows for visibility of compressor operation. This relay senses low voltage 24VAC on Y call. If the application is critical, please contact our Engineering Applications team for support.
TEST SERVICE MODE A dip switch setting is provided to reduce all time delay settings to 10 seconds maximum during troubleshooting for verifcation of unit operation. LED FAULT INDICATION Two LED indicators are provided as follows: GREEN: Power LED indicates 18 – 30 VAC at the board RED: Fault indicator with blink codes identifying the particular fault. This information is available via the malfunction (alarm) output contacts 1 BLINK - High Pressure
4 BLINKS - Condensate Overflow
2 BLINKS - Low Pressure
5 BLINKS - Brownout condition
3 BLINKS - Low Fluid Temperature (Freeze Protection)
INTELLIGENT RESET If a fault condition is initiated, the 5 minute delay on break time period is initiated and the unit will restart after this delay expires. The UPM is configurable for either 2 or 4 fault occurrences before going into a hard lockout. The selection is made through a dip switch setting on the board. If the fault condition still exists or reoccurs twice or four times within one hour, the unit will go into a hard lockout and requires a manual lockout reset. A condensate overflow fault will, however, put the unit into a hard lockout immediately. LOCKOUT RESET A hard lockout can be reset by turning the unit thermostat off and then back on or by shutting off unit power at the circuit breaker. The method of reset is selectable by the dip switch on the board. 18
EMS RELAY This optional switch allows you to connect to an energy management system that can turn the unit on and off.
PHASE MONITOR This option monitors the electrical phase and protects the compressor from burning up against phase loss or out of phase. PUMP/VALVE RELAY This option can be used to energize a supply pump or solenoid valve when there is a call for compressor operation. This relay can be used to switch either high or low voltage power. DISCONNECT SWITCH This option allows for local electrical circuit disconnect at the unit. FIRE ALARM RELAY/DUAL POINT POWER This optional accessory allows for smoke evacuation in case of fire. The unit fan is wired directly to a third party generator through an interlocking relay. WIRE TO 208V This option is for factory wired 208 voltage as the standard transformer is wired to 230 V. OUTSIDE AIR DAMPER This option is available on CA models only and allows for 100% outside air to enter the unit.
COMFORT ALERT MODULE This option monitors vital scroll compressor data quickly pinpointing a problem in the cooling/heating system. Includes common electrical problems, compressor defects, and system faults. A flashing LED indicator communicates the alert code to the service technician. FLUID DIFFERENTIAL PRESSURE SWITCH (DPS) OR FLOW PROVING This optional accessory protects the unit against water supply loss and to restart the unit without human intervention. The DPS is best used in apartment buildings and condominiums where access to individual WSHP’s is limited. The function of the differential pressure switch is to prevent or stop compressor operation should the water supply fail. This will prevent the unit from locking out on a safety requiring a manual reset to restart, commonly referred to as a nuisance trip. This optional control is internally mounted and factory installed. The switch is piped between the water entering and leaving connections. Should the pressure drop across the water to refrigerant heat exchanger and fall below set value, the switch will open de-energizing the compressor. The blower operation will not be affected by this option.
LOW TEMPERATURE WELL WATER
When low temperature well water is utilized as the water source (below 55°F), a means of establishing two flow rates, one for the cooling/reheat mode and one for heating mode is recommended. In the cooling mode at low entering water temperatures and standard flow rates, discharge pressures and corresponding discharge gas temperatures are relatively low. At these conditions, when the reheat mode is initiated, the low temperature discharge gas can reduce reheat capacity. A means to reduce the water flow rate and elevate the discharge pressure/temperature in cooling/reheat mode should be provided. Conversely, at low entering water temperatures in the heating mode, system suction pressure is reduced causing a loss in heating capacity. A means of providing higher flow in the heating mode should be supplied. The simplest way to accomplish the above is to install water regulating head pressure control valves.
INDOOR POOL DEHUMIDIFYING DURING WINTER MONTHS
It is important to remember that when in the reheat/ dehumidification mode the heat pump is cooling and reheating. A secondary means of heating the space during the dehumidification mode should be provided. For indoor pool environments, the indoor space temperature should be kept at least two (2) degrees F above the pool water temperature. If this is not done the warm pool water attempts to heat the space and the humidity levels increase exponentially. The heat pump is normally sized to handle the design latent load moisture removal. A second heat pump or resistance heat should be provided to handle the structure’s shell loss load. DuoGuard™ evaporator coil option is required for this application. (Note: Protective coatings are highly recommended for all pool applications, due to the highly corrosive chemical environment.)
BOILERLESS CONTROL
An option that allows the water source heat pump to be operated in heating mode safely when installed in a system that has no means of heating the water loop. This option consists of an adjustable aquastat and relay. During the thermostat call for heating, if the aquastat detects a drop in water temperature below a pre-set limit, the relay will disengage the compressor contactor and provide a dry contact closure to divert unit operation from compressor heating to an alternate heat source (generally field provided electric heat).
19
DDC CONTROLS
The optional factory mounted DDC Controller is pre-programmed and installed on the unit with the Unit Protection Module (UPM) to be job site ready. The unit will operate in a 100% stand-alone control mode or connect to a Building Automation System (BAS) using open protocols BACnet. Modbus, or N2. Stand-alone DDC modules must use remote intelligent sensors and are to be programmed by the Control Air M/M+ or Virtual Control Air M (Equipment Touch) controller only. Zone temperatures, leaving air temperatures and water temperatures can be monitored from the central control computer and unit fault indication displayed. AVAILABLE INPUTS/OUTPUTS INCLUDE: Discharge air temperature Leaving water temperature Fan run time Override time remaining Night setback status Percent of units cooling Percent of units heating Cooling set point Heating set point
Status of all the alarms Space temperature Occupied heating and cooling set points Continuous or cycle fan during occupied mode Command for occupied or unoccupied mode Command for override of the unoccupied mode (unit resorts to occupied set points) Set point adjustment
DDC ZONE SENSORS
To complement the controller, Bosch offers a line of intelligent space sensors, which provide precision measurement and communication capabilities in an attractive low profile enclosure. A hidden communications jack provides access to the HVAC control system for commissioning and maintenance. MODELS AVAILABLE INCLUDE ZS Manager Has a large LCD display and easy-to-use occupant controls for set point adjustment, heat/cool mode, and fan on/off/auto selection. ZS Push Has a large LCD display and easy-to –use occupant controls for set point adjustment. ZS Slidebar Has a local set point adjustment and override to an occupied mode and LED indication of current status. ZS Base which has no local temperature set point adjustment. NOTE: CO2 models are available also for ZS Push and ZS Manager only.
CONTROL AIR M/M+
A Control Air M/M+ diagnostic tool is available to allow local access to display and modify user defined properties without any computer software. These space sensors will monitor, sense and provide local control for the room. For more information on ZS Sensors, Control Air M/M+, and Control Air 5600/5830, please visit our website: www.bosch-climate.us 20
WATERSIDE ECONOMIZER COMMON WATERSIDE ECONOMIZER APPLICATIONS
FLUID FLOW
Available only on EC, EP, MC, LV, is a commercial application where perimeter heating takes place while core cooling is required by the controls. Perimeter heat pumps operating in the heating mode extract heat from the building loop, thus dropping the building loop fluid temperature. Internal core cooling requirements are usually high even in the winter months due to people, lighting, and equipment loads. The moderate temperature loop water circulated through a core heat pumps waterside economizer coil can provide free-cooling without the use of (compressor). Also, in many areas code requires some type of economizer cycle. Waterside Economizers in lieu of air side economizers are an inexpensive way to satisfy code requirements in commercial applications.
Fluid flow through heat pumps equipped with waterside economizer coils is directed by the use of a single threeway motorized ball valve. Flow is either through the waterside economizer coil and then through the condenser or through the condenser only. When applying these units to a variable speed pumping system, a separate field provided means of positive flow shut-off is required. (Re: A positive shut-off solenoid valve located down-stream of the heat pump. See figure 43.
AQUASTAT
The aquastat controller used on the Boilerless Control, is mounted to the heat pump electrical control box. All electrical control wiring is factory installed. The controller is supplied with an external range adjustment and screwdriver slot. Actual range is -30° to 100°F and requires field setting. The remote bulb stored inside the heat pump for shipping requires field mounting. Recommended settings: 45° F Cool, 90° F Heat
AIR SIDE PRESSURE DROP
The air side pressure drop shown on the waterside economizer performance tables is considered as additional heat pump external static pressure. Refer to Bosch Select Tools selection software for blower performance and to determine if the unit requires an optional fan upgrade.* *See fhp-mfg.com for BST Software.
Can be sized for preheating. Contact applications for support. Tenant build out commercial applications where the central chilled water fluid loop serves as an individual zoned heat pump condenser water. In this application low temperature fluid is always available for free-cooling.
3-Way motorized ball valve
figure 43.
N.C.
N.O. Aquastat
MBV
Waterside economizer coil
Fluid to refrigerant heat exchanger
N.O.
Fluid in
“Bulb Strapped to Fluid” in Line (field installed)
Positive shut-off solenoid valve for variable speed pumping system (field installed)
21
ACCESSORIES THERMOSTATS
The unit control may be as simple as a single stage thermostat or the unit may have a DDC controller integrated into the building management system. Low voltage control wiring is connected to the low voltage terminal strip located in the unit electrical box. Thermostats may be manual change over, auto change over, programmable or non-programmable depending on the requirements of the project. A full line of thermostats are available as an accessory. If your BCC thermostat is connected to a Bosch WSHP the following fault codes can be displayed on the BCC: High and Low Pressure Alarm Condenser Coil Freeze Alarm Condensate Alarm Brown Out Alarm and Evaporator Coil Freeze Alarm
HOSE KITS
Hose kits are recommended between the unit and system loop piping. This will help eliminate the transmission of vibration and noise from the unit to the space. Hoses are fire rated fiber reinforced EPDM Stainless Steel braid hoses with swivel connections. Maximum working pressure 400 PSI for sizes 1/2” – 1” diameter and 300 PSI for sizes 1 1/4” – 2”. A variety of hose kits are available depending on the job requirement. KIT 1 Hoses only. 3/4” through 2” diameter hoses are available with 24” and 36” hose lengths. 1/2” diameter hose kits are available only with 12” long hoses. KIT 2 With ball valves on the supply and return hoses. Valves have P/T (pressure/temperature) ports to facilitate pressure and temperature readings. KIT 3 With an automatic flow control valve. The design flow rate is preset at the factory per the design conditions and will automatically limit the flow to this value. This will greatly facilitate balancing of the fluid loop and ensuring each unit gets the required flow. KIT 4 With a Y-strainer and blow down valve on the supply side. The filter screen is 20 mesh, 304 stainless steel to help prevent dirt and debris from entering the water coil. KIT 5 With a 24V, 2 position solenoid valve (with 300 psig working pressure). This could be used to shut off flow to the unit when there is not a call for heating or cooling. A typical application would be with VFD pumping. KIT 6 With a 24V, 2 position solenoid valve (with 300 psig working pressure). Hose kit options are available in the accessories section of the BST selection software. 22
SPECIAL OPTIONS (ENGINEERED TO ORDER)
MARINE UNITS
Marine option (for sea faring boats) includes water fittings directly attached to the water coil (eliminating all copper pipe from the water side), oversized openings in the cabinet for routing supply water directly to the water coil, and the A. 2 in. high drain pain drain pan is 2 inches deep. B. Water connections brazed In addition, CuNi water coil directly to the COAX and extended range options must be selected. All of the above is necessary to help protect against the harsh marine environment and required for a limited warranty. A DuoGuard air coil option is also recommended. Available on LV, LM split, and EC units. Call for other series. Bosch is not responsible for damages if standard units are applied in marine applications.
POOL HEATER – WATER TO WATER
A dedicated water to water unit can be very useful for heating a pool and has the added benefit of reducing the building loop temperature. We build these units with a CuNi coil and the marine option to remove the copper and prevent corrosion and premature failure.
100% OUTDOOR AIR
The 100% Outdoor Air unit is purpose built to provide ventilation air, better dehumidification performance, high static, and neutral air delivery. Our value engineered option, is designed for conditioned space / indoor installations and is very competitive against the roof mounted competition. With this CUSTOM ENGINEERING OPTION, we typically slow the airflow down to around 170 CFM per ton to maximize the dehumidification performance BUT we can also accommodate designs with higher airflows with lower design humidity like we might see in California, Colorado, or Arizona. Bosch applications team can use ASHRAE weather or your custom design conditions to design a unit to match. We use EC vertical units for the majority of our 100%OA units BUT we also can-do 100%OA designs with MC series. Units less than 10 tons can be done also but static pressures won’t be very high.
SERIES EVAPORATOR (EC VERTICAL ONLY)
With EC vertical and high humidity loads like we see in Florida, South Carolina, Arkansas, we change the unit so that the evaporator coils are in series (evaporator #2 is behind evaporator #1), thereby dropping the air temperature down lower to aid in dehumidifying the air better. Then the air is reheated to neutral with Modulating Hot Gas Reheat (MHGRH). For shoulder season or part load conditions, only 1 stage of cooling may be utilized. One stage of heating is available with this design. Series Evaporator | Typical Cooling Application Example – 30 ton unit at 5,400 CFM = 180 CFM/ton
BOTTOM WATER
Bottom water and bottom condensate is typically available on LV007-070. This can be useful in tight installation spaces [usually older buildings with shallow AC closets, typically with metal jams and doors, without room for the door to close if units are front water (even with a 90° elbow)]. With this CUSTOM ENGINEERING OPTION, the water fittings are brazed directly to the water coil. An oversized hole is punched in the bottom of the cabinet for routing the water piping and condensate line. This can be combined with the marine CUSTOM ENGINEERING OPTION.
Introducing 5,400 CFM through 2 evaporator coils – use 1 coil in heating. Allows us to keep the head pressure up in the cooling mode with Low CFM
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PARALLEL EVAPORATOR
Standard evaporator arrangement is parallel design (evaporator #2 above evaporator #1). While this won’t provide as deep of dehumidification as series evaporator, this can be an appropriate design for applications that don’t require as much dehumidification or have more consistent temperatures year-round. Parallel design is available on EC vertical and horizontal. Also, MC series are offered only with parallel evaporator design. For units <= 10 tons, we mix and match the series depending on what blower(s) match best; typically choosing ES series when available to give 2 stages of cooling operation. On parallel evap design with low airflows, we provide cooling only units as heating would cause the unit to trip on safety cutoff. With higher airflows (air tempering without much need for dehumidification), we offer heating as well if the entering air is pre-heated to 40 degrees. All 100%OA designs come standard with factory DDC controls and the appropriate software logic.
VAV
Variable Air Volume applications require an inverter duty blower motor, VFD, and DDC / Inverter control to enable the fan speed to vary depending on the supply static pressure. Also note that Hot Gas ByPass (HGBP) is required to protect the compressor in case of low load conditions. Minimum airflow is 50% of nominal CFM for cooling and 80% for heating; these figures will vary based on your application.
VAV WITHOUT LEAVING AIR TEMPERATURE CONTROL (LAT)
The compressors will stage same as a normal unit based on zone / return air temperature. A duct static pressure sensor is used to control the VFD and blower CFM.
VAV WITH LAT CONTROL
For this arrangement, the compressors will stage based on the sensor value for “outdoor” air temperature (OAT). The OAT reading may come from a hardwired OAT sensor or written / re-written by the Building Automation System (BAS) as needed to trigger compressor staging [per 'DAC Multiple Reset Schedule' in the 'DISCHARGE AIR CONTROL (DAC) + VFD SEQUENCE.pdf' manual. Multiple reset is required to get heating mode.] A duct temperature probe is used to report the supply air temperature, and MHGRH is added to maintain a constant LAT in cooling. Please note we are not able to control the LAT in the heating mode.
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SHORT CIRCUIT CURRENT RATING - 65KA
Short-Circuit Current Rating (SCCR) is the maximum shortcircuit current a component or assembly can safely withstand when protected by a specific overcurrent protective device(s) or for a specified time. Adequate short-circuit current rating is required per NEC® 110.10. Short-circuit current ratings provide the level of fault current that a component or piece of equipment can safely withstand (based on a shock hazard or a fire hazard external to the enclosure). Without knowing the available fault current and short-circuit current rating, it is impossible to determine if components or equipment can be safely installed.
TALL CABINET
This custom engineering option is helpful for units where you can’t service the fan from the sides. The extra cabinet height, available on 1.5 - 6 ton models with FFT allows for motor access from the front of the unit. On the larger 6 – 25 ton sizes, the custom engineering option can be LV060 Tall Cabinet with done in FBT, FBR, FBF – that’s Front Return back return top supply, back return rear supply, or back return front supply. While not as easy as side access, all of these allow for motor access from the front of the unit. Rear return would be easiest with front only access (still requires rear access for filter replacement). We can accommodate requests for FFT (front return top supply) but motor service is considerably harder. FFF (front return front supply) is possible BUT side access is required for service. We have also done custom engineering options for different supply and return configurations with standard height cabinets – inquire with applications for details.
BRONZE GLOW
For corrosive environments, like a pool house or water treatment plant, we offer an custom engineering option for epoxy dipped coils. This may be required for some specs and could offer better protection than our DuoGuard offering. However, if not necessary, we would stick with the
Note: EC horizontal units that need a VFD require an custom engineering option (as the VFD doesn’t fit internally / mounting it within the cabinet) whether used for VAV or just balancing and smoke evac.
DuoGuard coil as with all custom engineering options it adds lead time and additional expense.
If galvanized steel cabinets are a primary concern, you can have a 3rd party spray on an epoxy coating or we do offer an custom engineering option for a stainless steel cabinet on EC and MC series.
DOMESTIC HOT WATER
(Heat Recovery Package (HRP) / desuperheater or double wall heat exchanger)
SMALL ECM MOTOR
(PIKA motor) (on sizes 007-012) A small ECM motor (aka “baby ECM / PIKA motor) can be requested as an ETO on LV and / or EP units. This ETO replaces the standard PSC motor with a small 42 frame ECM motor on cabinet sizes 007,009,012. This option is advantageous when a higher static pressure is needed due to high ESP or MERV 13 filter requirements. It will also help overcome the additional pressure drop due to a HGRH coil, available on the small EP sizes. The ECM efficiency improvement is not published or certified but can benefit where specs have specified an ECM motor requirement. New ETO offering. Please inquire with applications for details
Bosch FHP geothermal heat pump systems are some of the most energy and cost efficient on the market, as well as the greenest technology for heating and cooling commercial buildings. The technology utilizes the constant temperature of the earth which makes it extremely efficient.
SYSTEMS
Bosch WSHP Models may be used in a variety of different applications depending on the system design. An overview of tower/boiler and geothermal systems is given below. There could be several variations and combinations of these systems.
GEOTHERMAL SYSTEMS
We can provide an HRP for field installation on units that come without that option standard.
The earth has a tremendous capacity of storing thermal energy, which can be utilized to heat or cool a building. A geothermal system offers all the benefits of a cooling tower and boiler system with the additional advantage of having overall greater energy efficiency.
Not all of our units come with an option for factory installed desuperheater BUT we can provide an HRP for field installation. If a large quantity of domestic hot water is needed, we recommend using a dedicated water to water unit with a separate flat plate heat exchanger to meet the potable requirements.
As the cost of energy increases, geothermal installations are becoming the system of choice by developers and design engineers.There are several alternative methods of utilizing the energy contained in a geothermal system, giving the design engineer several options for selecting the one that is right for a particular application. 25
COOLING TOWER/BOILER SYSTEMS
Water source heat pumps with cooling tower/boiler systems have been used for many years and are recognized as having a low installation cost and providing more energy efficient operation than most other systems on the market. In a typical building, each office or space would receive its own heat pump. This ensures that the unit will independently satisfy the heating or cooling requirements for that space irrespective of the requirements of any other space. Unlike some other systems, this offers individual control and enhanced comfort in all areas. All the units are connected to a common water loop containing, in addition to the heat pumps, a cooling tower, possibly a boiler, a primary and standby pump and a loop water temperature controller. In the summer cooling mode, the units are cooling and rejecting heat to the water loop. This heat is then rejected to the atmosphere through a cooling tower. In winter, heat is taken from the loop and, together with the compressor’s heat of compression, used to heat the space. The heat removed from the loop is then replenished by the boiler, if installed. The loop water temperature controller will keep the fluid within certain temperature limits typically 70°F in winter and 85°F in summer by cycling either the cooling tower or boiler. In today’s modern buildings the interior core usually has a net cooling requirement year round irrespective of the outside temperature. This is due to the internal heat gains from people, office equipment and lighting. The heat from heat pumps operating in cooling is rejected to the common water loop and is absorbed by heat pumps on the building’s perimeter that are in the heating mode. In effect the system is transferring energy around the building areas from where it is in excess to those areas where it is needed. In many instances we find a balanced system where the heat generated in the interior space is sufficient to heat the perimeter, resulting in neither the cooling tower nor boiler operating. This concept, unique to a water source system, provides the most energy efficient system on the market.
EARTH COUPLING OPTIONS GROUND LOOP SYSTEMS (CLOSED LOOP)
Lengths of high density polyethylene (HDPE) piping are buried in the earth either in vertical bore holes or horizontal trenches depending on the space available. Fluid from the loop inside the building circulates through these pipes either rejecting heat to the ground when there is a net cooling requirement or absorbing heat from the ground when heating is the dominant requirement. The temperature of the earth below 6 feet is relatively constant and is not affected by the ambient temperature. For this reason, the ground temperature is cooler than the summer ambient and warmer than the winter ambient in most regions. Geothermal systems are able to operate effectively in extreme ambient conditions exceeding 100°F in summer and -30°F in winter. This is one of the reasons why geothermal systems have such an advantage over other systems. An additional advantage is that no fossil fuels are used, reducing the carbon emission of the building. Even in areas which are cooling or heating dominant a hybrid system can be used with a downsized cooling tower or boiler. This system will reduce the installed cost significantly with only a modest impact on overall operating efficiency. Geothermal systems may cost more to install but the savings in energy and low maintenance costs more than offset this with payback times typically ten years or even less. 26
VERTICAL GROUND LOOP SYSTEM
This method is used mainly in commercial buildings or where space for a loop field is limited. Vertical holes 100 to 400 feet deep are drilled in the ground, and a single loop of high density polyethylene pipe with a U-tube at the bottom is installed. The bore hole is then sealed with grout to ensure good contact for heat transfer with the soil. The size of the project will determine how many bore holes are required. The vertical ground loops are then connected to a horizontal header pipe that carries fluid to the building and circulated to each heat pump. The Earth’s temperature is stable below the surface which is an advantage for this system and provides for the greater efficiency. Vertical ground loop fields may be located under buildings or parking lots. The life expectancy is in excess of 50 years.
HORIZONTAL GROUND LOOP SYSTEM
This type is cost effective on smaller projects or where there is sufficient space for the loop field. Trenches, three to six feet deep are dug in which a series of high density polyethylene pipes are laid. These loops are connected to a manifold and connected to the loop inside the building which feeds the heat pumps. The fluid is then circulated, absorbing or rejecting heat to the earth depending on the requirement for heating or cooling.
TYPICAL HEAT PUMP SYSTEM SURFACE WATER, LAKE OR POND SYSTEM
This type of design is economical when a project is located near a body of water. Fluid circulates through polyethylene piping in a closed system, just as it does through ground loops, but in this case, underwater. The pipes may be coiled in a slinky design to fit more surface into a given amount of space. The lake needs to be a minimum size and depth depending on the building load. Lake loops have no adverse impact on the aquatic system. Specialized lake plate heat exchangers are also available for this application. New technology is emerging for stainless steel and titanium heat exchangers.
WELL WATER SYSTEM
This type of installation is only possible if there is sufficient ground water available in a well. The water must be of good quality. Local codes may limit the use of this system in certain areas. The arrangement is referred to as an open system which means that water is pumped directly from the source into the geothermal unit and then discharged either into a return well or a body of water. The water quality is unaffected other than a change in the temperature. Refer to the installation manuals for water quality guidelines
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TYPICAL HEAT PUMP OPERATION COOLING MODE
When properly installed and functioning, a Water Source Heat Pump (WSHP) can help maintain cool, comfortable temperatures while reducing humidity levels inside any commercial structure. In the cooling mode, the WSHP’s “air coil” air-to-refrigerant heat exchanger acts as an “evaporator” and the “coaxial coil” water-to-refrigerant heat exchanger acts as a “condenser”. The reversing valve is energized for cooling. During cooling, the conditioned space heat load in the air, within the return ductwork, is absorbed by evaporating the cold, liquid/vapor mixture of refrigerant within the “air coil” air-to-refrigerant heat exchanger. The “air coil” cools the air to condition the space, which is distributed by blowers and ductwork. The cool refrigerant liquid/ vapor mixture is then drawn into the compressor where its temperature and pressure are increased. This heat, along with the heat of the compressor, is then directed to the reversing valve, and then to the “coaxial coil” waterto-refrigerant heat exchanger. Hot refrigerant vapor or gas within the “coaxial coil” is then condensed into a liquid when heat is rejected to the water, or an anti-freeze solution, passing through the water-to-refrigerant heat exchanger. The liquid refrigerant then flows through a liquid line filter-drier to absorb system contaminants, and then to a metering device, referred to as a thermostatic expansion device (TXV), that provides a drop in refrigerant pressure and temperature. The liquid refrigerant then returns via the “liquid line” to the “air coil” air-to-refrigerant heat exchanger, so the cycle can be repeated.
Basic Refrigeration Cycle Cool Refrigerant Gas
Air to Refrigerant Heat Exchanger
Cool Refrigerant Gas
Thermal Expansion Valve
WATER-TO-AIR HEAT PUMP CYCLE — COOLING
Loop Fluid Warm Liquid Refrigerant
Loop Fluid
Loop Fluid
Water to Refrigerant Heat Exchanger
Cold Liquid Refrigerant
Cool Refrigerant Gas ReversingValve Hot Refrigerant Gas
Hot Refrigerant Gas Hot Refrigerant Gas
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Compressor
HEATING MODE
When properly installed and functioning, a Water Source Heat Pump (WSHP) can help maintain warm, comfortable temperatures inside any commercial structure.
Basic Refrigeration Cycle
In the heating mode, the WSHP’s “coaxial coil” water-to-refrigerant heat exchanger acts as an “evaporator” and the “air Cool Refrigerant Gas coil” air-to-refrigerant heat exchanger acts as a “condenser”. The reversing valve is deenergized for heating. Air to During heating, cold liquid refrigerant enters the “coaxial coil” water-to-refrigerant heat exchanger, Refrigerant or “evaporator”, Heat where heat is absorbed from the heat source (water, or an anti-freeze solution). Evaporation of the refrigerant Refrigerant inCool the Exchanger Gas “evaporator” causes a change from a liquid to a saturated vapor. Thermal Expansion Valve
Loop Fluid
Warm Liquidsuction Refrigerant side Coldof Liquid Refrigerant The low-pressure saturated vapor, or gas, flows through the reversing valve and to the the compressor. Energy is consumed as the refrigerant is compressed, and then refrigerant vapor at high pressure and temperature Water to leaves the compressor outlet. Refrigerant Loop Fluid
Loop Fluid
Heat Exchanger
Cool Refrigerant Gas ReversingValve
Heat is then transferred from the compressor to the “air coil” air-to-refrigerant heat exchanger, acting as the Hot “condenser” during heating. Condensation from a vapor to a saturated liquid occurs in the “condenser”, Refrigerant and Gas warm, Compressor heated air is then supplied to the conditioned spaces via blowers and ductwork. Hot Refrigerant Gas Hot Refrigerant Gas
The refrigerant leaves the “condenser” as saturated liquid. The liquid refrigerant then flows through a thermostatic expansion valve, or TXV metering, where it is throttled, decreasing refrigerant pressure and temperature and expanding it to a cold liquid, and then to a liquid-line filter-drier to absorb system contaminants. The refrigerant, now in the “liquid line”, finally travels to the entering side of the Hot Refrigerant Gas “coaxial coil” water-to-refrigerant heat exchanger, or “evaporator”, Air to Refrigerant so the cycle can be repeated. Heat Exchanger
Hot Refrigerant Gas
Thermal Expansion Valve Loop Fluid
WATER-TO-AIR HEAT PUMP CYCLE — HEATING
Cold Liquid Refrigerant
Loop Fluid
Loop Fluid
Water to Refrigerant Heat Exchanger
Warm Liquid Refrigerant
Cool Refrigerant Gas ReversingValve Hot Refrigerant Gas
Compressor
Cool Refrigerant Gas Hot Refrigerant Gas
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TYPICAL UNIT INSTALLATION UNIT LOCATION
Any mechanical device will, at some point in time require servicing and repair. With this in mind sufficient space must be provided around the unit for service personnel to perform maintenance or repair. Units are not designed for outdoor installation. Avoid locations where the unit may be exposed to freezing conditions or where the humidity levels could cause condensation on the unit panels, for example, when exposed to outdoor ambient conditions.
VERTICAL UNIT INSTALLATION
Vertical units are normally installed in a closet or mechanical plant room. If installed in a closet or other confined space, ensure adequate space for return air to the unit. Sufficient space must be provided for filter replacement and access to the compressor and blower for service. Units should be set on a piece of rubber, neoprene or other vibration absorbing material at least 1/3” to 1/2” thick. The pad should extend 3/4” over the entire base of the unit. Avoid direct line of sight to the unit. Install a sound baffle over any door that has a return air grille.
HORIZONTAL UNIT INSTALLATION
Horizontal units are typically suspended above the ceiling by four (fi eld supplied) 3/8” threaded rods fastened to the unit by the factory supplied hanger bracket kits. The kits include rubber isolators to help prevent transmission of vibration and noise to the building structure. Units should be located directly below a structural member, so that it is securely anchored. A horizontal unit should be positioned to allow for removal of the filters and access panels. Allow at least 18” clearance on each side of the unit for service and 36” in front of the unit for maintenance access. The filter needs to be slid out and sufficient space must be provided to allow this. Do not install the unit above any piping or electrical raceways. The unit should be able to be removed to the floor without major rearrangement of other mechanical or ceiling components. Consideration needs to be made as to the location of the units. Avoid installing units directly above occupied spaces (e.g. above office desks or classrooms). This will minimize possible disruption to the occupants if maintenance or service is required as well as keeping a potential source of noise out of the area. If possible, units should be installed above the hallway drop ceiling in schools, and the supply and return air is routed directly into classrooms. Local code may require fi re dampers to be used in this application. 30
DUCTWORK AND SOUND ATTENUATION CONSIDERATIONS Sound is becoming an increasingly important factor in all HVAC installations. The LV models has been designed to minimize sound, but sound acoustical design plays an important part of the sound level in the space.
Most of the problems associated with HVAC generated sound can be avoided by paying close attention to duct design and equipment placement. A discharge flange is provided on all horizontal unit models for fastening of ductwork. We recommend using a flexible collar between the discharge flange and the duct transformation to reduce vibration transmission from the cabinet and to simplify disconnection of the unit from the ceiling ductwork.
Lining the first five feet of supply duct reduces noise
Turns attenuate blower noise
Take-offs should be at least five feet away from the plenum
Return air to the unit could be either free return or ducted. The filter rack is provided with a 1” flange should a ducted return be used. We recommend using a flexible collar between the return flange and the duct transformation to reduce vibration transmission from the cabinet and to simplify disconnection of the unit from the ductwork. Sound is transmitted down the ductwork and it is important to avoid direct line of sight between the unit and the space, both on the return or supply side. To accomplish this, design the duct runs with two 90° turns. As a general recommendation, duct interiors should have an acoustic / thermal lining of least 1/2” thick over the entire duct run or a minimum of the first 5 feet of the supply trunk. Line the last five diameters of duct before each outlet with a 1” thick sound blanket. Line elbows and transition pieces, as well as a short distance upstream and downstream of the fittings. Elbows, tees and dampers can create turbulence or distortion in the airflow. Using aerodynamic fittings will help in reducing this effect. Place a straight length of duct, 5 to 10 times the duct width, before the next fitting to smooth out airflow. Diffusers that are located in the bottom of a trunk duct can also produce noise. Balancing dampers should be located several duct widths upstream from an air outlet. Ductwork should be mounted and supported using isolation devices that absorb vibration. Applications such as Hotel, Motel, Dormitory or Nursing Homes that use a single duct discharge are susceptible to noise. These applications typically have low static pressures and short duct lengths. In these applications the discharge duct must be fully lined and have a square elbow without turning vanes. A velocity not exceeding 500 to 600 fpm is recommended. Return air for these applications should enter through a sidewall grille and route up the stud space to a ceiling plenum. For horizontal heat pumps mounted in the ceiling plenum, an insulated return plenum is sometimes placed at the return air opening to further attenuate line-of-sight sound transmission through return openings.
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PIPING
The water loop system is typically designed using a “reverse return” piping system which includes a flow control device so that flow requirements are met for each zone. A high pressure stainless steel flexible hose kit is recommended to connect the unit to the building’s hard piping and acts as a sound attenuator for both the unit operating noise and hydraulic pumping noise. One end of the hose has a swivel fitting to facilitate removal of the unit for replacement or service. Hose kits come in several configurations, but in all cases should include supply and return shutoff ball valves to allow removal of a unit without the need to shut down the entire heat pump system. The hose kit may contain either a manual or automatic flow control that may be preset to ensure correct water flow to the unit. Pressure / Temperature ports should be included and located adjacent to the supply and return coaxial coil connections on the unit. This will allow the service technician to measure temperature and pressure drop across the coaxial coil (refrigerant-to-water heat exchanger, when checking unit operation and proper capacity.
CONDENSATE DRAIN PIPING
Condensate piping can be made of steel, copper or PVC pipe. In most cases, PVC pipe eliminates the need to wrap insulation around the pipe to prevent sweating. A 3/4” FPT condensate drain connection is installed in the unit. The condensate piping must be trapped at the unit and pitched away from the unit not less than 1/4” per foot. A vent is required after the trap so that the condensate will drain away from the unit. The vent can also act as a clean out if the trap becomes clogged. The condensate drain should not be directly piped to a drain/waste/vent stack. See local codes for the correct application of condensate piping to drains.
OPERATING LIMITS
All WSHP are capable of operating over a wide range of conditions. For operation in a geothermal application or any other installation where the loop fluid temperature may drop below the ambient dew point, the extended range option is recommended. This consists of TXV in lieu of capillary tubes and additional insulation on the piping and heat exchanger to prevent condensation. Maximum and minimum fluid conditions are at unit rated flow rate. Maximum and minimum operating limits may not be combined. If one value is at either maximum or minimum, the other two should be at normal operating range. Entering fluid temperatures below 45°F in the heating mode requires antifreeze.
EQUIPMENT SELECTION
To ensure that you get the optimal performance from your FHP heat pump it is important that they be selected accurately to match your design conditions. Prior to making equipment selections the zone conditions need to be determined. Bosch Thermotechnology Corp. recommends using a building load program to determine the heating and cooling loads. The individual product catalogs provide a summary of the unit performance as well as a wide range of entering air and water conditions that will meet most applications. Our Bosch Select Tools Selection Software (BST 2.0) is designed to provide you with a fast and accurate selection based on your specific conditions. This software is available through the commercial website. You may click on the BST link and request an account.
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Bosch Select Tools 2.0 A Single Source For
▶ Product Selection
▶ Quotations
▶ Product Ratings
▶ Ordering
▶ Submittal
bst.bosch-thermotechnology.us/eRep/
Notes
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Bosch Thermotechnology Corp. Watertown, MA | Londonderry, NH | Ft. Lauderdale, FL General Inquiries: 1-800-326-1400 www.boschheatingandcooling.com
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