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Bradford White UDH Series, Руководство по обслуживанию

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Manual 238-49640-00A

SERVICE

MANUAL

Troubleshooting Guide

and Instructions for Service

(To be performed ONLY by

qualified service providers)

Models Covered

by This Manual:

ECO-Defender Safety System

®

 Models

UDS140S*FRN
UDS150S*FRN
UDH1504T*FRN
UDH165T*FRN
UDH175S*FRN
UDH50T45FR*N
UDH65T45FR*N
UDH75T50FR*N

(*) Denotes Warranty Years

Ultra Low NOx Direct Vent Water Heaters

UDS / UDH Series

Содержание UDH Series

Страница 1: ...ions for Service To be performed ONLY by qualified service providers Models Covered by This Manual ECO Defender Safety System Models UDS140S FRN UDS150S FRN UDH1504T FRN UDH165T FRN UDH175S FRN UDH50T45FR N UDH65T45FR N UDH75T50FR N Denotes Warranty Years Ultra Low NOx Direct Vent Water Heaters UDS UDH Series ...

Страница 2: ...ement and Installation 6 I Thermopile Testing and Replacement 9 II Pilot Assembly Inspection Cleaning and Replacement 10 III Igniter Electrode Testing and Replacement 11 IV Honeywell Gas Control Testing Disassembly and Replacement 20 V Burner Operation Inspection Adjustment Cleaning and Replacement 21 VI Dip Tube and Anode Inspection and Replacement 23 VII Generic Parts List 25 2 2 ...

Страница 3: ...gned to facilitate problem diagnosis and enhance service efficiency To further promote quicker service times the gas valve can be removed and replaced without draining the water heater Please read the service manual completely before attempting service on this new series of direct vent water heaters How the Safety System Works During normal operation air for the combustion chamber is drawn into th...

Страница 4: ...lure 2 Unstable pilot 3 Pilot tube block or restricted Service Procedure If the pilot will not stay lit replace pilot assembly If problem persists replace Gas Control 1 Adjust set point knob to desired setting Normal operation 1 See service procedure II 2 See service procedure III 3 See service procedure III Flammable Vapor Ignition Resistant Water Heaters Green LED Indicator Observe green LED ind...

Страница 5: ...ontrol is wet or physically damaged Pilot valve stuck in open position Service Procedure 1 See service procedure V 1 Reset Gas Control 2 Replace Gas Control Replace Gas Control Flammable Vapor Ignition Resistant Water Heaters Green LED Indicator Observe green LED indicator on Gas Control Error flash codes are displayed with a three second pause before repeating Check and repair the system as noted...

Страница 6: ...ch Remove the main burner feedline from the gas control with a wrench Step 7 Disconnect the spark igniter wire from the gas control Step 8 Remove the burner assembly from the combustion chamber Step 9 Fully inspect burner and inner door gaskets for the following Tears Other imperfections that will inhibit proper seal Missing Material Gasket adhesion to inner door Cracks Material left on combustion...

Страница 7: ...with the built in washer to secure the left side of the burner door in place DO NOT OVER TIGHTEN SCREWS Step 14 Position the fiberglass sock containing the igniter wire the pilot tube and the armored thermopile cable against the inner door flange Inner Door Gasket Replacement Procedure WARNING If the information in these instructions is not followed exactly a fire or explosion may result causing p...

Страница 8: ...opening Secure right side inner door using 1 4 hex drive screws from step 5 DO NOT OVER TIGHTEN SCREWS Verify both burner and right sides of the inner door are properly positioned and sealed against the combustion chamber Step 17 Reconnect the igniter wire to the gas control Step 18 Replace outer jacket burner access door Step 19 To resume operation follow the instructions located on the lighting ...

Страница 9: ...connector OPEN CIRCUIT THERMOPILE TESTING Normal thermopile operation will be between 350mV 850mV If reading is less than 350mV replacement of pilot assembly is recommended following SERVICE PROCEDURE III Step 4 If thermopile reading is between 350mV 850mV remove multimeter and reconnect red thermopile wire to red wire leading from the gas control Reconnect white thermopile wire negative terminal ...

Страница 10: ...8 Inspect pilot orifice a Remove nut from bottom of pilot assembly b Remove pilot tube and pilot orifice c Inspect pilot orifice for blockage must be cleaned or replaced Honeywell pilot orifice not replaceable replace pilot assembly Step 9 Install pilot electrode assembly to feedline secure with screw from step 6 Step 10 Re Install burner assembly and right side inner door per SERVICE PROCEDURE I ...

Страница 11: ...er and install a jumper wire in its place Hold the other end of the jumper by the wire insulation or using an insulated tool next to an unpainted surface such as the feedline and depress the igniter If there is a spark the igniter is OK the pilot is not functioning and must be replaced see SERVICE PROCEDURE III for pilot replacement If no spark is present the igniter is not functioning and must be...

Страница 12: ...of these components may be replaced without replacing the entire Gas Control LINE PRESSURE The Gas Control is designed for a maximum line pressure of 14 0 w c and a minimum line pressure of 1 0 w c over the water heater s rated manifold pressure check rating plate Line pressure must be checked with the main burner on and off to assure proper readings Gas Control Cover Piezo Igniter Valve Body Back...

Страница 13: ...sure tap plug Check for gas leaks prior to placing water heater back into operation by following the instructions located on the lighting instruction label or the lighting instructions located in the installation and operation manual Step 7 If gas pressure is outside the specification noted above refer to Honeywell Gas Control Testing Disassembly and Replacement to replace Gas Control or valve bod...

Страница 14: ...ance of temperature sensor see caution and photos above Replace Gas Control Once the temperature sensor resistance values are known the water temperature must also be known to determine if the resistance values are correct See next page to obtain water temperature Are temperature sensor resistance values correct CAUTION DO NOT use standard multimeter probes for this test Doing so will damage conne...

Страница 15: ...arious Temperatures Example If temperature of water is 84 F then the resistance through the sensor would be 8449 see shaded area NOTE Sensor resistance increases as the temperature decreases WARNING Stored water may be HOT when performing the following steps in this procedure Take necessary precaution to prevent personal injury Step 1 Set the Gas Control knob to the OFF position Step 2 Turn off in...

Страница 16: ...ep 4 Disconnect igniter wire Step 5 Disconnect main burner feedline pilot tube and thermopile wires from gas control Step 6 Remove Gas Control cover screw Rotate knob counter clockwise to the OFF posistion Step 7 Depress both tabs on the top of the Gas Control cover and pull to remove Gas Control cover screw CAUTION Use caution not to bend or damage valve body pins when removing or installing Gas ...

Страница 17: ...ect temperature sensor from control board and remove wire from the temperature sensor wire routing clip Disconnect temperature sensor Step 9 Remove the piezo igniter from the control cover by releasing the lock tab on the control cover Release lock tab Temperature sensor wire routing clip 17 The Bradford White 17 ...

Страница 18: ...ion stick make sure the assembly is inserted FULLY into the backplate and the wires are routed through the wire routing clips Failure to do so will not allow valve body to be reinstalled properly and may damage temperature sensor wires Insertion stick fully inserted into backplate Step 10 Remove the valve body by removing screw located at the lower left corner then unclipping the lower right side ...

Страница 19: ...rection Step 13 To reassemble Gas Control follow the previous steps in reverse order Once Gas Control is reassembled burner assembly is reinstalled and the gas supply line is reconnected resume water supply to water heater Be sure tank is full of water before relighting Step 14 To resume operation follow the instructions located on the lighting instruction label or the lighting instructions locate...

Страница 20: ...the water heater a Install gas control into water heater by rotating clockwise DO NOT use a wrench on the gas control body or damage to the gas control may occur If necessary use a length of NPT pipe threaded into gas inlet of gas control b Bend the main burner feedline and pilot tube back to the gas control and attach to the gas control Connect the igniter wire and the white thermopile wire to th...

Страница 21: ...AIN BURNER Inspection Cleaning and Replacement DANGER Under no circumstances shall flammable materials be used or stored in the vicinity of the water heater With the inner door removed the Bradford White Defender Safety System will be inactivated If flammable vapors are present a fire or explosion may result causing property damage personal injury or death WARNING Inner door and burner components ...

Страница 22: ...if necessary Step 6 Remove pilot assembly refer to SERVICE PROCEDURE III for cleaning and inspection Step 7 Reassemble burner Step 8 Reinstall burner and inner door per SERVICE PROCEDURE I steps 9 through 19 Step 9 To resume operation follow the instructions located on the lighting instruction label or the lighting instructions located in the installation and operation manual Feedline Main Burner ...

Страница 23: ...ould be open and free of any blockage Anti siphon hole located approximately 6 from the bottom of nipple should be free of any blockage Any damage such as cracks restriction due to deformation or unintentional holes are not field repairable and the inlet nipple dip tube must be replaced Step 6 Upon completion of inspection or subsequent replacement reinstall inlet nipple dip tube into heater Conne...

Страница 24: ...f the original anode diameter approximately 5 8 diameter replacement is recommended If any of thesteel core of the anode is exposed replacement is recommended Step 6 Upon completion of inspection or subsequent replacement reinstall outlet nipple anode into heater Connect nipple to plumbing system resume water supply and refill heater with water Step 7 To resume operation follow the instructions lo...

Страница 25: ...et Anode 18 Heat Trap Outlet 19 T P Relief Valve 20 NPT Tank Plug UDH Models 21 Feedline Spring Clip 22 Air Intake Boot 23 Air Intake Boot Gasket 24 Complete Right Side Inner Door 25 Screw 10 12 x Hex Washer Head 26 Screw 8 18 x Hex Washer Head 27 Brass Drain Valve 28 Outer Door 29 Gas Control 30 Inner Door Gasket Kit 31 Heat Trap Kit 32 ASSE Approved Mixing Valve Optional 33 Ultra Low NOx Burner ...

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