Bradford White POWER VENTED GAS WATER HEATER Instruction Manual

238-45917-00F REV 3/08 POWER VENTED GAS WATER HEATER A Spanish language version of these instructions is available by contacting the company listed o

10 Venting continued- Vent pipes serving power vented appliances are classified by building codes as “vent connectors”. Required clearances from

11 Part I - Venting Specifications for: 25 Gallon (94.6 L), 48 Gallon (181.6 L), 55 Gallon (208.2 L), 65 Gallon (246.0 L) 75 Gallon (283.

12 Venting (Part I) continued- TABLE 2 -VENT CONNECTOR LENGTHS FOR 4” (10.2 cm) DIAMETER VENT PIPE Maximum straight Length ft (m) Terminating # o

13 Venting (Part I) continued- THROUGH THE WALL VENTING: (HORIZONTAL VENTING) Cut a 3 1/2 in. (8.9 cm) diameter hole in the wall at the point wher

14 Venting (Part I) continued- THROUGH THE ROOF VENTING: (VERTICAL VENTING) Cut the necessary holes through the roof and ceiling and install the

15 Venting (Part I) continued- THROUGH THE WALL VENTING WITH LOW GROUND CLEARANCE: When venting cannot exit through the wall at a height greater t

16 Venting (Part I) continued- TABLE 3 3” (7.6 cm) VENT CONNECTOR LENGTHS FROM INSIDE WALL FOR LOW GROUND CLEARANCE INSTALLATIONS Max Straight Len

17 Part II - Venting Specifications for: 40 Gallon (151.4 L) 50 Gallon (189.2 L) This water heater is a power vented appliance and is designe

18 Venting (Part II) continued- TABLE 6 VENT CONNECTOR LENGTHS FOR 3” (7.6 cm) DIAMETER VENT PIPE Terminating # of 90° Elbows (excluding vent term

19 Venting (Part II) continued- NOTE: Properly sized PVC, CPVC or ABS pipe must be used. THROUGH THE WALL VENTING: (HORIZONTAL VENTING) Cut a 2

2 CONGRATULATIONS! You have just purchased one of the finest water heaters on the market today! This installation, operation and instruction

20 Venting (Part II) continued- THROUGH THE ROOF VENTING: (VERTICAL VENTING) Cut the necessary holes through the roof and ceiling and install the

21 Venting (Part II) continued- THROUGH THE WALL VENTING WITH LOW GROUND CLEARANCE: When venting cannot exit through the wall at a height greater

22 Venting (Part II) continued- TABLE 7 2” (5.1 cm) VENT PIPE LENGTHS FROM INSIDE WALL FOR LOW GROUND CLEARANCE INSTALLATIONS Terminating # of Elb

23 Vent Pipe Preparation and Joining Most failures in vent systems result from improper preparation and joining of pipe and fittings. The guideli

24 Vent Pipe Preparation and Joining continued- d) Cementing must be done quickly to avoid over-drying before joining. i) Apply one coat to the

25 Combustion Air Supply Provide adequate air for combustion and ventilation. An insufficient supply of air will cause recirculation of combust

26 Installation (Combustion Air Supply) continued- All Air From Inside the Building: The confined space must be provided with two permanent openi

27 Water Connections NOTE: BEFORE PROCEEDING WITH THE INSTALLATION, CLOSE THE MAIN WATER SUPPLY VALVE. After shutting off the main water supply,

28 Water Connections continued- WARNING For protection against excessive temperatures and pressure, install temperature and pressure protectiv

29 Water Connections continued- This water heater can deliver scalding temperature water at any faucet in the system. Be careful whenever using

3 TABLE OF CONTENTS page GENERAL INFORMATION... 4 INSTALLATION...

30 Gas Connections The gas supply lines must meet all requirements of the National Fuel Gas Code (ANSI Z223.1-Latest Edition), or in Canada CAN/CG

31 Electrical Connections All electrical wiring and connections must be in accordance with the National Electric Code ANSI/NFPA No. 70 (latest edi

32 Wiring Diagram Figure 10

33 GENERAL OPERATION TO FILL THE WATER HEATER 1. Close the water heater drain valve by turning the stem clockwise. 2. Open the cold water supp

34 Lighting and shutdown instructions                

35 Hotter water increases the risk of scald injury. Scalding may occur within five (5) seconds at a temperature setting of 140°F (60°C). To prot

36 Burner Flame Check Cast Iron Burner: At the time of installation and at periodic intervals (not more than 6 months), a visual check of the mai

37 MAINTENANCE The following maintenance should be performed by a qualified service technician at the minimum periodic intervals suggested below

38 Maintenance continued- 5. Annually remove the inner door and main burner assembly to clean orifices and related parts of any dirt or other for

39 Maintenance continued- Contact your supplier or plumbing professional for replacement parts or contact the company at the address given on the

4 GENERAL INFORMATION This gas-fired water heater’s design is certified by CSA International under the American National Standard Z21.10.1, CSA 4.

40 TROUBLESHOOTING One short flash everyfour secondsAlternates bright anddim (Heartbeat)Thermostat callingfor heat (no fault).Short flash once eve

41 Troubleshooting continued- Six flashes-fourflashes, three secondpauseUndesired-false pilotflame sensed.System auto resets.Seven flashes, threes

42 PARTS LIST DRAWING (ACTUAL WATER HEATER VISUAL REPRESENTATION MAY VARY) PARTS LIST PART NAME AND DESCRIPTION 1. Blower Assembly 11. Diptu

43 THE FOLLOWING INSTRUCTIONS ARE FOR INSTALLATION OF: GAS WATER HEATERS SUITABLE FOR WATER (POTABLE) HEATING AND SPACE HEATING 1. All piping com

44 NOTES

Save this manual for future referenceManual 47150ASERVICEMANUALFor Bradford WhiteTTW® Series Models:M2TW75T*(BN,CX)TW475S76(B,C)* (N,X)(*) Denotes War

Bradford WhiteTTW SeriesGas Water HeatersTable of ContentsPage TTW Service ProcedureIntroduction 4 - - -How to use this manual 5 - - -Tool required

WARNING: If the information in theseinstructions is not followed exactly, a fire orexplosion may result causing property damage,personal injury, or d

Page 4IntroductionThe new Bradford White TTW2 & TW4 water heaters are designed to provide reliableperformance with enhanced standard features. Ne

Tools Required for ServiceIt is intended for this manual to be used by qualified service personal for the primary purpose oftroubleshooting and repair

5 General Information continued- A sacrificial anode is used to extend tank life. The removal of this anode, for any reason, will nullify the warr

SpecificationsThermal well TCO Limit Residential 188°F (87°C), Commercial 199°F (93°C)Residential TemperatureSet Point Range60°F (16°C) to 160°F (71°C

SpecificationsVenting Specifications:Through the WallTerminating# ofElbowsMaximumLength ft (m)MinimumLength ft (m)3" Diameter (7.6 cm) PVC Vent C

Control TimingsIgnition StateTimingPre-purge2 SecondsTrial for Ignition 90 SecondsFlame Stabilization Period 3 SecondsInter-purge 15 SecondsFlame Fail

Sequence of OperationThermostat calls for heat.Prior to energizing blower, gas control checks safety circuit to insure the circuit is open. Normal swi

Steady state operation.During Steady State Operation the Control Monitors:Thermostat temperature sensor- When set point temperature is satisfied, gas

Sequence of OperationAbnormal Operation (cont.)3. Pressure Switch/Blower Temperature Fault:a) Pressure switch closed at start of call for heat - The g

Short flash, once everyfour seconds“Heartbeat”, alternatesbright/dimThermostat callingfor heat (no fault).Short flash once persecondWeak pilot signalo

Six-four flash, threesecond pauseUndesired-falsepilot flamesensed.System autoresets.Seven flash, threesecond pauseSimulatedResistive DeviceHarness out

Step 1. With main burner in operation, remove outer jacket door and slide inner door from left to right to open.Step 2. To adjust for proper burning,

Burner CleaningStep 1. Position gas control power switch to the“OFF” position and unplug heater from walloutlet.Step 2. Turn off gas supply to water h

6 Installation (Locating The Water Heater) continued- Water heater corrosion and component failure can be caused by the heating and breakdown of a

TTW SERVICE PROCEDURE IIPilot testing, Cleaning and ReplacementPilot Inspection, Testing and ReplacementStep 1. Position gas control power switch to

TTW SERVICE PROCEDURE IIIPressure Switch Testing andReplacementPressure Switch TestingWARNING120 volt potential exposure. Use cautionmaking voltage ch

Pressure Switch ReplacementWARNING120 volt potential exposure. Use cautionto avoid personal injury.Step 6. Reconnect wires from step 5 to new pressure

TTW SERVICE PROCEDURE IVBlower Testing and ReplacementWARNING115 volt potential exposure. Use caution whenmaking voltage checks to avoid personal inj

TTW SERVICE PROCEDURE IVBlower Testing and ReplacementStep 1. Position gas control power switch to the “OFF” position.Step 2. Unplug blower power cor

TTW SERVICE PROCEDURE VBlower Temperature Switch Testingand ReplacementBlower Temperature SwitchTesting.WARNING120 volt potential exposure. Use cauti

TTW SERVICE PROCEDURE VBlower Temperature Switch Testingand ReplacementBlower Temperature SwitchReplacement.WARNING120 volt potential exposure. Use c

Thermal Well TestingPosition gas valve powerswitch to the “OFF”position and disconnectthermal well harness fromgas control.NYUsing a multi-meter set t

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TTW SERVICE PROCEDURE VIGas Control & Thermal Well Testingand ReplacementGas Control & Thermal Well Removal From Water HeaterStep 1. Position

7 Installation (Locating The Water Heater) continued- The water heater must be located close enough to the outside wall to keep the venting dista

Gas Control Assembly to Thermal WellStep 6. Reconnect wire harnesses to gas controlper the illustration.Step 7. Reconnect gas piping to gas control.Re

TTW SERVICE PROCEDURE VIISimulated Resistive Device TestingSimulated ResistivedeviceStep 1. Position power switch on gas control to the“OFF” position

TTW SERVICE PROCEDURE VIIISafety Circuit Voltage TraceSafety Circuit VoltageTraceWARNING120 volt potential exposure. Use cautionmaking voltage checks

TTW SERVICE PROCEDURE IX120 VAC TraceWARNING120 volt potential exposure. Use cautionmaking voltage checks to avoid personal injury.Disconnect cord set

TTW SERVICE PROCEDURE XDip TubeInspection and replacementStep 1. Position on/off switch of gas control valve to “OFF” position and unplug water heate

TTW SERVICE PROCEDURE XIAnodeInspection and replacementStep 1. Position on/off switch of gas control valve to the “OFF” position and unplug water heat

TTW SERVICE PROCEDURE XIIFlue BaffleInspection and replacementStep 1. Position gas control power switch to the “OFF” positionand unplug blower from wa

NOTESPage 33Glossary of TermsBTU British Thermal UnitsGPM Gallons per MinuteHz HertzKW/h Kilowatts per hourLED Light Emitting DiodeNPT National Pipe T

NOTESPage 3434

Parts List1. Blower Complete2. Air Mixing Inlet cover3. Pressure Switch4. Blower Temp. Switch5. Blower Gasket6. Blower Power Cord7. Vent Adapter8. Con

8 Minimum Clearances This installation must allow access to the front of the water heater and adequate clearance must be provided for servicing a

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9 Venting continued- Canadian Installations1 US Installations2 A= Clearance above grade, veranda, porch, deck or balcony 12 inches (30 cm) 12