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Manual 238-50629-00A

SERVICE

MANUAL

Troubleshooting Guide

and Instructions for Service

(To be performed ONLY by

qualified service providers)

Models Covered

by This Manual:

U2TW75T*RN
UTW475S76R*N
(*) Denotes Warranty Years

Gas Water Heaters

U TTW 75 Series

Содержание U2TW75T*RN

Страница 1: ...238 50629 00A SERVICE MANUAL Troubleshooting Guide and Instructions for Service To be performed ONLY by qualified service providers Models Covered by This Manual U2TW75T RN UTW475S76R N Denotes Warra...

Страница 2: ...I Pilot Testing Cleaning and Replacement 19 III Pressure Switch Testing and Replacement 20 IV Blower Testing and Replacement 22 V Blower Temperature Switch Testing and Replacement 24 VI Gas Control Te...

Страница 3: ...O NOT ATTEMPT TO LIGHT ANY GAS APPLIANCE IF YOU ARE NOT CERTAIN OF THE FOLLOWING x Liquefied petroleum gases propane gas and natural gas have an odorant added by the gas supplier that aids in the dete...

Страница 4: ...d exterior environments Cooler operation increases blower life by reducing bearing wear and noise Rugged Wiring Connections receptacle type connections promote error free wiring Increased Vent Lengths...

Страница 5: ...ual Page 5 Manometer A liquid U tube type or a digital type can be used This device is used to measure gas and or air pressure and vacuum Multi Meter A digital type is strongly recommended This device...

Страница 6: ...rease 1 28 opens on vacuum decrease 1 25 Power supply Dedicated 115VAC 60 Hz 15A Approved Gas Type Natural Venting System Power vent through the wall or vertical through the roof Approved Vent Materia...

Страница 7: ...th ft m 4 Diameter 10 2 cm PVC Vent Connector Lengths 1 175 53 3 10 3 1 Through the Wall 2 170 51 8 10 3 1 Through the Wall 3 165 50 3 10 3 1 Through the Wall 4 160 48 8 10 3 1 Through the Roof 0 50 1...

Страница 8: ...um Post purge 15 Seconds PS Fault Delay failed open close Retry after 2 Minutes Soft Lockout Retry after 5 Minutes ECO Limit Lockout Indefinite cycle power to restart Simulated Resistive Load Lockout...

Страница 9: ...operation with no perceivable delay If the device is out of range the control LED immediately flashes 7 times with 3 second pause Normal Heating Sequence 1 2 Blower Energizes 3 Pressure Switch Proves...

Страница 10: ...eds to verify resistive delay for 2 minutes and flashes 8 times then once with a three second pause This process is repeated 5 times until the control either returns to normal operation or proceeds to...

Страница 11: ...ed the gas control turns off the blower and flashes 6 times then 2 times with 3 second pause The gas control waits 5 minutes before repeating ignition sequence 4 Trial For Ignition Fault a Pressure sw...

Страница 12: ...build up on pilot electrode 4 Wire damage to pilot assembly or bad connection at gas valve 1 4 Page 19 1 Pressure switch tubing kinked or blocked 2 Blocked pressure tap on switch or blower 3 Faulty p...

Страница 13: ...o be reset 2 Control is wet or physically damaged 1 Interrupt power supply 2 Replace gas control page 26 Troubleshooting Six three flash three second pause Pilot flame extinguished System auto resets...

Страница 14: ...rk igniter flame sensor wire and the simulated resistive device from the gas control see photo 1 b Disconnect main burner feed line wrench pilot tube 7 16 wrench and igniter wire from gas control see...

Страница 15: ...O NOT OVER TIGHTEN SCREWS Inner Door Gasket Replacement Procedure WARNING If the information in these instructions is not followed exactly a fire or explosion may result causing property damage person...

Страница 16: ...on chamber Step 13 Reconnect spark igniter flame sensor wire and simulated resistive device to the gas control See photos 1 2 on page 14 Step 14 Reconnect the pilot tube to the gas control and tighten...

Страница 17: ...dure below DANGER Under no circumstances shall flammable materials be used or stored in the vicinity of the water heater If flammable vapors are present a fire or explosion may result causing property...

Страница 18: ...CE PROCEDURE I steps 5 through 16 Step 11 To resume operation follow the instructions located on the lighting instruction label or the lighting instructions located in the installation and operation m...

Страница 19: ...acks in the pilot tube If found the pilot must be replaced Step 7 Inspect pilot orifice a Remove 7 16 nut from bottom of pilot assembly b Remove pilot tube and pilot orifice c inspect pilot orifice fo...

Страница 20: ...blockage Replace switch see page 21 Position gas valve power switch to the ON position and adjust thermostat to call for heat this will start the blower Check with multi meter do pressure switch conta...

Страница 21: ...p 1 Position gas control power switch to the OFF position Step 2 Remove the three screws Phillips screw driver from control access cover on blower assembly and remove cover see photos 4 and 5 Pressure...

Страница 22: ...C Step 1 Position gas control power switch to ON position and adjust control to call for heat Step 2 Remove the three screws Phillips Screw driver from control access cover on blower assembly and rem...

Страница 23: ...et head of water heater Step 8 Set new blower with gasket in place using locating pins on blower flange to line up with location holes in jacket head Be sure not to damage gasket Step 9 Secure blower...

Страница 24: ...driver from control access cover on blower and remove cover see photos 17 and 18 Step 3 Locate blower temperature switch see photo 19 Reconnect wire leads and observe heater operation Do exhaust gas...

Страница 25: ...llow wire leads from switch Step 5 With an appropriate tool such as side cutters snip the retaining lug from the blower housing to allow removal of temperature switch see photo 18 Step 6 Remove switch...

Страница 26: ...or damage to the gas control may occur If necessary use a length of NPT pipe threaded into gas inlet of gas control b Position the main burner feedline and pilot tube back to the gas control and atta...

Страница 27: ...ctions 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...

Страница 28: ...and 45 000 ohms If outside of this range replace the simulated resistive device If there is no continuity test the resettable thermal switch by following SERVICE PROCEDURE IX If the resettable therma...

Страница 29: ...uity is not indicated the switch is open possibly due to an over heating condition The switch is designed to open at predetermined temperatures An open switch can be reset by depressing the red colore...

Страница 30: ...hermal switch into place using screws from step 6 DO NOT OVER TIGHTEN SCREWS Step 8 Place manifold cover back in position and secure using the screws from step 4 Step 9 Reconnect wire leads from gas c...

Страница 31: ...the igniter sparking Y Y Is LED on gas valve flashing the heartbeat code alternating bright dim N Safety circuit voltage is OK No voltage from gas control call for technical support Y NOTE This proced...

Страница 32: ...meter set to volts AC is there 115VAC across terminals shown in photo 28 N Y 27 28 Reconnect cord set shown in photo 27 Repair damage Check for damage to AC supply power cord Y N Replace Blower 31 Che...

Страница 33: ...be Inlet nipple dip tube should be free of cracks and any blockage Hydro jet slots should be open and free of any blockage Any damage such as cracks restriction due to deformation or unintentional hol...

Страница 34: ...spect outlet nipple anode Outlet nipple anode should show signs of depletion this is normal If depletion is of the original anode diameter approximately diameter replacement is recommended If any of t...

Страница 35: ...ary Step 8 Reinstall baffle into flue tube Be sure baffle hanger tab are inserted into notch location at the top of the flue tube see photos 35 36 Step 9 Check Burner to insure no scale has accumulate...

Страница 36: ...ute Hz Hertz KWh Kilowatt hour LED Light Emitting Diode NPT National Pipe Thread Ohms Ohms resistance PSI Pounds per Square Inch RPM Revolutions per Minute ECO Energy Cut Out VAC Volts Alternating Cur...

Страница 37: ...NOTES Page 3 37...

Страница 38: ...NOTES Page 38 38...

Страница 39: ...r 10 Gas Control 11 Gas Control Wire Harness 12 Brass Drain Valve 13 Ultra Low NOx Burner 14 Right Side Inner Door Assembly 15 Pilot Assembly 16 Manifold Mount Hex Head Screw 17 Manifold Mount 18 Main...

Страница 40: ......

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