Residential Gas Energy Saver Combi2™ TTW® Water Heater System
254/255 C
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The Combi2 TTW FVIR Defender Safety System® Models Feature (50 gallon model only): ■ Advanced ScreenLok® Technology flame arrestor design ■ Flammable vapor sensor All Combi2™ TTW® Models Feature: ■ Bradford White ICON System™ ■ Heat Exchanger—Double wall 11⁄2" O.D. enamel coated (Vitraglas®) steel coil ensures separation of potable water and heating fluid ■ Provides domestic hot water and hydronic heating in one system ■ Low Heat Exchanger Head Loss—Up to 10 GPM flow, with less than 3.75 ft. of head loss ■ Integrated Mixing Device
■ Vitraglas lining ■ Factory installed Hydrojet® Total Performance System ■ Power vented ■ Horizontal venting ■ Vertical venting ■ Water Connections – K 3/4" NPT factory installed true dielectric fittings ■ 3/4" Front supply and return connections ■ 2" Non-CFC foam insulation ■ Two protective anode rods ■ T&P relief valve installed ■ Low restriction brass drain valve ■ Pedestal base ®
B D&G
A J H
F E
Photo of C-DW2-TW50T10FBN
Meet or exceed ASHRAE 90.1b (current standard) CEC Listed Recovery Efficiency ranging up to 80% (Minimum)
Combi2™ Power Vented Energy Saver Models DIMENSIONS IN INCHES
A
NATURAL GAS AND LIQUID PROPANE GAS MODELS Model Number
Gal. Cap.
C-DW2-TW50T10FBN C-DW2-TW75T10BN
45 72
Input BTU/Hr.
67,000 76,000
Floor to GPH Vent Recovery 90°F Rise* Conn.
72 82
657/8 683/8
B
C
D
E
Jacket Dia.
Vent Size
Floor to T&P Conn.
Floor to Gas Conn.
22 26
3 3
501/8 53
113/4 15
F
28 307/8
All propane models feature a Titanium Stainless Steel burner. For propane (LP) models change suffix “BN” to “SX”. *Based on manufacturers rated recovery efficiency. 110 V.A.C Required for Power Venting / 110 V.A.C., 60HZ, 3.1 Amperes.
Supply Temperature Return Temperature Differential Flow Rate Net Output
140°F 120°F 20°F 2.3 GPM 20,000 BTU/Hr.
120°F 100°F 20°F 3.4 GPM 29,000 BTU/Hr.
100°F 80°F 20°F 4.4 GPM 38,000 BTU/Hr.
*These values were obtained using 180°F stored tank temperature. Net Output is the space heating capacity based on normal piping and pickup allowance of 15%. Actual values may vary based on circulator flow rate, number of zones, water and space heating demands. Numbers subject to change.
H
J
K
501/8 53
563/8 601/4
603/4 641/4
263/4 31
(LP) LP Gas Inputs
Heat Exchanger Head Loss
Heat Exchanger Values*
G
Floor to Floor to Floor to Floor to Approx. Exchanger Exchanger Top of Top Water Shipping Inlet Outlet Heater Conn. Depth Weight (lbs)
GPM
Ft. of Hd. Loss
2 5 8 10 12
0.15 0.94 2.40 3.75 5.40
245 315 GPH Rec. 90°F Rise
C-DW2-TW50T10FSX 60,000 BTU/Hr. 65 C-DW2-TW75T10SX 75,500 BTU/Hr. 81 C-DW2-TW50 C-DW2-TW75
Max. Equivalent Length Min. Equivalent Length Number of 90° Elbows†
3" 4" Vent Pipe Vent Pipe
1 2 3
60 ft.** 7 ft. 55 ft. 50 ft. 45 ft.
180 ft. 15 ft. 175 ft. 170 ft. 165 ft.
Subtract 5ft. for each additional 90° elbow. †Consult the I&O manual for Four or more elbows. **C-DW2-TW75 maximum 3" vent length is 50ft.