Bradford-White CorpメーカーTW450S65Fの使用説明書/サービス説明書
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Save this manual for future reference Manual 238-46238A-00A SERVICE MANUAL Troubleshooting Guide and Instructions for Service (To be performed ONLY by qualified service providers) Models Covered by Th.
Page TTW Service Procedure Introduction 4 - - - How to use this manual 5 - - - Tool required for service 5 - - - Specifications 6 - - - Control Timings 9 - - - Sequence of Operation 10 - - - Troublesh.
WARNING: If the information in these instructions is not followed exactly, a fire or explosion may result causing property damage, personal injury, or death. WHAT TO DO IF YOU SMELL GAS Do not try to light any appliance. Do not touch any electrical switch; do not use any phone in your building.
Page 4 Introduction The new Bradford White TTW1, TTW2 & TW4 water heaters are designed to provide reliable performance with enhanced standard features. New design features include reliable spark to pilot ignition system, enhanced diagnostics, simplified servicing, significantly quiet operation and additional vent lengths.
It is intended for this manual to be used by qualified service personal for the primary purpose of troubleshooting and repair of the Bradford White TTW Series water heaters. Understanding the sequence of operation section of this manual will contribute greatly to troubleshooting the water heater.
Specifications Thermal well TCO Limit Residential 188°F (87°C), Commercial 199°F (93°C) Residential Temperature Set Point Range 60°F (16°C) to 160°F (71°C) (Ap proximate temperatures) Blower Temperature Switch Normally closed, opens @ 165°F (74°C), auto reset @ 130°F (54°C).
Specifications Venting Specifications for : 40 Gallon 50 Gallon 60 Gallon Through the Wall Terminating # of Elbows Maximum Straight Length ft (m) Minimum Straight Length ft (m) 2" Diameter (5.1 cm) PVC Vent Connector Lengths 1 45 (13.7) 2 (.6) Through the Wall 2 40 (12.
Specifications Venting Specifications for : 48 Gallon 65 Gallon Through the Wall Terminating # of Elbows Maximum Straight Length ft (m) Minimum Straight Length ft (m) 3" Diameter (7.6 cm) PVC Vent Connector Lengths 1 55 (16.8) 2 (.6) Through the Wall 2 50 (15.
Control Timings Ignition State Timing Pre-purge 2 Seconds Trial for Ignition 90 Seconds Flame Stabilization Period 3 Seconds Inter-purge 15 Seconds Flame Failure Response Time 1.
Sequence of Operation Thermostat calls for heat. Prior to energizing blower, gas control checks safety circuit to insure the circuit is open. Normal switch positions in the safety circuit are as follows: a) Pressure switch normally open. b) Blower temperature switch normally closed.
Steady state operation. During Steady State Operation the Control Monitors: Thermostat temperature sensor- When set point temperature is satisfied, gas valve is shut down an d blower will post purge for 15 seconds. Control LED flashes a short flash once every 4 seconds (idle) status code.
Sequence of Operation 3. Pressure Switch/Blower Temperature Fault: a) Pressure switch closed at start of call for heat - The gas control waits four seconds then, proceeds to flash 2 times with 3 second pause. The control waits 2 minutes and then turns on blower for 30 seconds.
Short flash, once every four seconds “Heartbeat”, alternates bright/dim Thermostat calling for heat (no fault). Short flash once per second Weak pilot signal on last call for heat. Two flash, three second pause Pressure switch not working - closed position.
Six-four flash, three second pause Undesired-false pilot flame sensed. System auto resets. Seven flash, three second pause Eight-one flash, three second paus Eight-three flash, three second pause Thermal well sensor damaged or unplugged LED Status Control Status Service Procedure Probable Cause Pilot valve stuck in open position .
Step 1. With main burner in operation, remove outer jacket door and inner door per service procedure XIII on page 34. Step 2. To adjust for proper burning, loosen the air shutter nut, rotate the air s.
Burner Cleaning Step 1. Position gas control power switch to the “OFF” position and unplug heater from wall outlet. Step 2. Turn off gas supply to water heater. Step 3. Remove outer jacket door and slide inner door open from left to right. Remove Outer door.
TTW SERVICE PROCEDURE II Pilot testing, Cleaning and Replacement Pilot Inspection, Testing and Replacement Step 1. Position gas control power switch to the “OFF” position and unplug heater from wall outlet. Step 2. Turn off gas supply to water heater.
TTW SERVICE PROCEDURE III Pressure Switch Testing and Replacement Pressure Switch Testing WARNING 115 volt potential exposure. Use caution making voltage checks to avoid personal injury. Step 1. Position power switch on gas control to the “OFF” position.
Pressure Switch Replacement WARNING 115 volt potential exposure. Use caution to avoid personal injury. Step 6. Reconnect wires from step 5 to new pressure switch. Step 7. Reconnect tubing to new pressure switch. Step 8. Carefully position pressure switch into blower housing.
TTW SERVICE PROCEDURE IV Blower Testing and Replacement WARNING 115 volt potential exposure. Use caution when making voltage checks to avoid personal injury. Blower Testing Is there 115VAC across terminals shown in photo 12 ? Incorrect supply voltage polarity Determine power source problem and correct.
TTW SERVICE PROCEDURE IV Blower Testing and Replacement Step 1. Position gas control power switch to the “OFF” position. Step 2. Unplug blower power cord from wall outlet. Step 3. Disconnect vent system from exhaust adapter on top of blower. Step 4.
TTW SERVICE PROCEDURE V Blower Temperature Switch Testing and Replacement Blower Temperature Switch Testing. WARNING 115 volt potential exposure. Use caution to avoid personal injury.
TTW SERVICE PROCEDURE V Blower Temperature Switch Testing and Replacement Blower Temperature Switch Replacement. WARNING 115 volt potential exposure. Use caution to avoid personal injury. Step 1. Position gas control power switch to the “OFF” position and unplug heater from wall outlet.
Thermal Well Testing Thermal well testing Position gas control power switch to the “OFF” position and disconnect thermal well harness from gas control.
° F 012345678 9 40 26109 25400 24712 24045 23399 22771 22163 21573 21000 20445 50 19906 19383 18876 18383 17905 17440 16990 16553 16128 15715 60 15314 14925 14548 14180 1382 3 13477 13140 12812 12494.
TTW SERVICE PROCEDURE VI Gas Control & Thermal Well Testing and Replacement Gas Control & Thermal Well Removal From Water Heater Step 1. Position gas valve power switch to the “OFF” position and Unplug Heater from power supply. Step 2. Drain heater to a point below the gas control level.
Gas Control Assembly to Thermal Well Step 6. Reconnect wire harnesses to gas control per the illustration. Step 7. Reconnect gas piping to gas control.
P age 28 TTW SERVICE PROCEDURE VII Flammable Vapor Device Testing Flammable Vapor Sensor Step 1. Position power switch on gas control to the “OFF” position. Step 2. Disconnect flammable vapor sensor from gas control. Step 3. Using a multi-meter set to the ohms setting check resistance of flammable vapor sensor.
TTW SERVICE PROCEDURE VIII Safety Circuit Voltage Trace Safety Circuit Voltage Trace WARNING 115 volt potential exposure. Use caution making voltage checks to avoid personal injury.
TTW SERVICE PROCEDURE IX 115 VAC Trace WARNING 115 volt potential exposure. Use caution making voltage checks to avoid personal injury. Disconnect cord set as shown in photo 28 LED status None, Control LED not on or flashing. Step 1. Verify 115VAC and proper polarity at wall outlet.
TTW SERVICE PROCEDURE X Dip Tube Inspection and replacement Step 1. Position on/off switch of gas control valve to “OFF” position and unplug water heater from wall outlet. Step 2. Turn off cold water supply to water heater. Connect hose to drain valve of water heater and route to an open drain.
TTW SERVICE PROCEDURE XI Anode Inspection and replacement Step 1. Position on/off switch of gas control valve to the “OFF” position and unplug water heater from wall outlet. Step 2. Turn off cold water supply to water heater. Connect hose to drain valve of water heater and route to an open drain.
TTW SERVICE PROCEDURE XII Flue Baffle Inspection and replacement Step 1. Position gas control power switch to the “OFF” position and unplug blower from wall outlet. Step 2. Disconnect vent system from exhaust adapter on top of blower. Step 3. Unplug cord sets from blower.
Inner Door Removal Procedure Step 1. Position gas control power switch to the “OFF” position. Step 2. Remove outer jacket burner access door Step 3. Inner Door Removal. a) Remove (2) 1/4" hex drive screws from right side inner door. b) Remove (2) 1/4" drive screws from flange section of inner door.
Installation of Inner Door With Gasket. WARNING Stripped fastener connections may allow for seal breach of inner door. A seal breach may result in a fire or explosion causing property damage, personal injury or death. Do not over tighten screws in steps 8, 10 and 11.
Step 10. Firmly place right side inner door flange against the left side inner door flange and secure with two ¼” drive screws from step 3b. DO NOT OVER TIGHTEN SCREW S . Step 11. Align right side inner door to combustion chamber and verify the fastener holes of the combustion chamber are aligned with the right side inner door slotted opening.
P age 37 Scr eenLok ® Flame Arr estor Cleaning: Step 1. P osition Gas Control P o w er Switch to the OFF position. Step 2. Remo ve outer jack et. Step 3.
NOTES Page 34 Glossary of Terms BTU British Thermal Units GPM Gallons per Minute Hz Hertz KW/h Killo-watts per hour LED Light Emitting Diode NPT National Pipe Thread Ohms Ohms of resistance PSI Pounds per Square Inch RPM Revolutions per Minute TCO Temperature Cut Off VAC Volts Alternating Current W.
Parts List 1. Blower Complete 2. Air Mixing Inlet cover 3. Pressure Switch 4. Blower Temp. Switch 5. Blower Gasket 6. Blower Power Cord 7. Vent Adapter w/vent term. 8. Condensate Hose Kit 9. Flue Reducer (M2 only) 10. Heat Trap Out let 11. Hot Water Outlet Anode 12.
Email parts@bradfordwhite.com techserv@bradfordwhite.com www .bradfordwhite.com.
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