Thermostat range

On/Off Control

Specifications at a glance

SET POINT

On/Off control is the method of control used by most heating systems in the UK. The

controls simply switch mains current supplied to the boiler on or off at different times.

On/Off thermostat control

Time Proportional + Integral control (TPI) is a method of calculating the demand from a room thermostat, controlling the boiler so that it fires for shorter periods as the temperature approaches the set point. This is an industry standard term, describing

SET POINT

a mathematical calculation of demand. TPI allows the flow temperature from the boiler to fall as demand reduces, which, in turn, helps the return temperature to stay below the Dew Point (55oC) so that the

DT92E

Load Compensation and currently accrues a 3% boiler efficiency increase under the TPI thermostat control

Modulating Control

CM957

Modulating

Temperature range ( C) 10-30

10-30

5-35

5-35

5-35

5-35

5-28

Y6630D1007

24-230V AC, 5A resistive

DT90E

DT90E1012

24-230V AC, 8(3)A

DT92E

DT92E1000

24-230V AC, 5A resistive

OpenTherm, a Honeywell invention that has been made into an open standard for

CM901

CMT901A1044

24-230V AC, 8A resistive

all to use.†

CM907

CMT907A1041

24-230V AC, 8A resistive

CM921

CMT921A1042

24-230V AC, 5A resistive

CM927

CMT927A1049

24-230V AC, 5A resistive

Many boiler and control manufacturers now recognise the energy savings potential

T87

T87M1029

n/a

of modulating control, so have adopted OpenTherm as the best method to control a

Y87RF

Y87RFXXXX

n/a

CM937

CMT937A1027

n/a

CM957

CMT957A1009

n/a

demand signal. The most common protocol used for modulating control of modulating boilers is

Modulating control

5-28

P P P P

1

3 yrs

Y6630D

SET POINT

7 2 yrs

10(3)A

Instead of switching a boiler on and off at intervals, the modulation of the gas valve

1 2 yrs

T6360B1036*

Small change... big effect with thermostats working to close control, further large

CM937

2 yrs

T6360

Y87RF

4 yrs

Switch Rating

heating system efficiently.†

T87

2 yrs

o

Full Part Number

OpenTherm

CM927

Battery life

Product

Modulating control is a method of control used by modern heating systems in the UK. allows the amount of heat provided by the boiler to be controlled to match the varying

CM907

P TPI On/Off P P P P P OpenTherm modulation P P P Wired P P P P P Wireless P P P Wireless 2 way P Load compensator P P P P P P P P Optimum start P P P 1 day/7 day

boiler can operate in condensing mode more frequently. This effect is referred to as SAP calculations.†

DT90E

Standard On/Off

the boiler to burn whilst there is a live supply to it. When the current is interrupted, the

TPI Control

Y6630D

On/Off Feature

When the controls switch on, the current opens the gas valve, strikes a spark and allows boiler ceases to fire.

T6360

Thermostat Range

7

5-35

5-35

OpenTherm®

OpenTherm®

* Other models available

en

e r g y s a v i ng

Small change... big effect

savings can usually be made without any loss of comfort by reducing the set point.

Honeywell Honeywell House, Bracknell Berkshire, RG12 1EB Tel: 01344 656000 Fax: 01344 656240 E-mail: uk.infocentre@honeywell.com www.honeywelluk.com

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Installation efficiency

On/Off

Modulating

Wired

Wired

Wired

The traditional approach to connecting controls, normally through

What was originally fitted in the home, tends to dictate what

switching mains.

is achievable now. If a system was wired up many years ago,

Cables must be laid in first fix, with the correct number of cores.

then that means that the cables were fitted to suit an old

Once wired up, it is very reliable. • Tried and tested • Familiar • Simple

fashioned system. Some boilers operate at lower voltage, so separate circuits are required to switch 24 or 230V. Fault finding is easy if a standard wiring system is used, or if all cables are marked. If the person who installed the wiring made up their own wiring diagram, the challenge is immense.

DT90E Wired digital room thermostat

CM900 Wired programmable room thermostat

T87 Modulating room thermostat

• Mains voltage room thermostat

• Energy saving TPI control

• Energy saving TPI control

• Attractive modern styling

• Energy saving modulating control

• Well proven dual diaphragm

• ECO button for energy saving mode

• Energy saving profile built in

• Easy to use temperature control dial

• Energy saving profile built in

sensing element

• Slim modern design

• Slim modern design

• Large display for easy to read clear information

• Slim modern design

• Large LCD with easy to read text

• Large LCD with easy to read text

• Room thermostat is wall mounted

• Large LCD with easy to read text

• Large terminals for easy wiring

• Simple user operation

• Simple user operation

• Requires only a low voltage OpenTherm connection

• Simple user operation

• Easy to read, large setting dial

• Up to 4 years battery life

• 2 year battery life

• No batteries required

• Variants include: numbered dial

• Direct replacement of the DT200

By locating the receiver in the right place, a system can be made

benefits over wired approach.

• No first fix

Fault finding is easy, as signals can be induced within the home

• No cable laying

and made to operate the correct devices without reference to

• No chasing out • No lifting floorboards • No making good Wireless controls are quicker and cleaner to fit. The adaptable nature of wireless allows for the user to control their heating requirements, rather than being restricted by what was originally fitted. For example, wireless zoning and wireless radiator valve controllers make use of wireless signals and once installed can be moved to alter how the system performs, with the minimum of fuss.

OpenTherm®

• Intelligent room temperature control of a single zone

digital thermostat

Wireless

The modern way of connecting controls. Numerous extra

CM930 Wired modulating programmable room thermostat

• Standard accurate temperature control

setting, tamper proof model

Wireless

OpenTherm®

Wireless

previous work. Robust RF protocols ensure that signals are sent, received and acted upon reliably, with no confusion of signals, resulting in improved control efficiency and increased confidence in systems acceptability. Two way wireless communication also gives better feedback on installation and during use. Signal strength is displayed on screen and the binding is confirmed at both the sending and receiving devices.

Y6630D Wireless room thermostat

DT92E Wireless digital room thermostat

CM920 Wireless programmable room thermostat

Y87RF Wireless modulating room thermostat

• Battery powered wireless

• Energy saving TPI control

• Energy saving TPI control

• Attractive modern styling

• Energy saving modulating control

• ECO button for energy saving mode

• Energy saving profile built in

• Easy to use temperature control dial

• Energy saving profile built in

• Energy saving TPI control

• Slim modern design

• Slim modern design

• Large display for easy to read clear information

• Slim modern design

• Intelligent room temperature control

• Large LCD with easy to read text

• Large LCD with easy to read text

• No wiring required to thermostat, reducing time

• Large LCD with easy to read text

room thermostat

of a single zone • Simple to install • LED shows demand, battery status and RF signal • Easy to read, large setting dial

• Simple user operation • 2 year battery life

• Simple user operation • 2 year battery life

OpenTherm®

and cost involved

CM950 Wireless modulating programmable room thermostat

OpenTherm®

• Simple user operation

• OpenTherm receiver requires only low voltage connection

• OpenTherm receiver requires only low voltage connection

• 3 year battery life

• 2 year battery life

• Pre-bound wireless thermostat and receiver

• Pre-bound wireless thermostat and receiver

• Battery powered • Volt free connections

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Thermostat-Range (1)
Thermostat-Range (1)