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16

TROUBLE SHOOTING HELP

THERMOSTAT AND GAS SUPPLY CHECK

A hydrogen sulfide (rotten egg) odor may result if water contains
high sulfate and/or minerals. Chlorinating the water supply
should minimize the problem, see EXTENDED NON-USE
PERIODS.

NOTE: Anode rod must remain installed (except for inspection)
to avoid shortening tank life. See LIMITED WARRANTY. Replace
as necessary.

SERVICE AND REPAIR

The A.O. Smith water heater requires no special care other than
the normal maintenance as noted above. If you are having a
problem with your water heater, before calling for service please
refer to the following TROUBLESHOOTING sections. If service
becomes necessary, contact your dealer, installer or an
authorized service agent. Do not attempt to repair the water heater
yourself. Any work performed by unauthorized personnel may
void the warranty.

If you are having a problem with your A.O. Smith water heater
and are not pleased with the service you received:

First, please contact your dealer or the A.O. Smith authorized
service agent in your area and explain to them why you are
not satisfied. This will usually correct the problem.

If after working with your dealer or service agent the problem
has not been resolved to your satisfaction, please let us
know by either writing to us at:

A.O. Smith Water Products Company
Service Department
106 Adkisson St.
Ashland City, TN 37015

or, going to our website at:

 www.aosmithwaterheaters.com

Please click on: "Mail"
then click on: "Service"
and leave us a message.

Please be sure to provide the following information when writing
or e-mailing:

•  Model Number

•  Serial Number

•  Date of Original Purchase

•  Date Problem Originated

•  Explanation of Problem

Also, please be sure to include a daytime telephone number.

No

Turn "ON" gas supply.

Is gas being supplied to the thermostat?

Yes

Is thermostat calling for heat? Run (hot) water from heater
and set adjustment button higher. Check using a
manometer at thermostat pressure tap.

Is there a minimum gas pressure 4" (1kPa) W.C.
for natural gas or 10" (2.5 kPa) W.C. for propane
(L.P.) gas?

Call gas company to
increase gas pressure.

GO TO TROUBLE SHOOTING
SECTION, PAGE 17.

Yes

Yes

Yes

No

Summary of Contents for GPDH

Page 1: ...er heater from A O Smith Water Products Company We appreciate your confidence in our products You should thoroughly read this manual before installation and or operation of this water heater Please pay particular attention to the important safety and operating instructions as well as the WARNINGS and CAUTIONS ADIVISION OFA O SMITH CORPORATION www aosmithwaterheaters com GET TO KNOWYOUR WATER HEATE...

Page 2: ...CONTROL HARNESS AND INSIDE JACKET GAS MODEL GPDH GPDT GPDX WITH HOT SURFACE IGNITION CERTAIN MODELS ARE EQUIPPED WITH SIDE PLUMBING CONNECTIONS FOR SPACE HEATING HOT AND COLD FITTING ASSEMBLIES PART NO 900126 2 TEMPERATURE INDICATORS TEMPERATURE ADJUSTMENT BUTTONS TYPICALNATURALGAS PILOT MAIN BURNER HOT SURFACE IGNITION ASSEMBLY Replacement parts and recommended delimer may be ordered through auth...

Page 3: ...aking an insulation blanket unnecessary WARNING Should you choose to apply an insulation blanket to this heater you should follow these instructions see Figure 1 for identification of components mentioned below Failure to follow these instructions can restrict the air flow required for proper combustion potentially resulting in fire asphyxiation serious personal injury or death Do not cover the ou...

Page 4: ...THE HEATER OR TO LOWER FLOORS OF THE STRUCTURE When such locations cannot be avoided a suitable drain pan should be installed under the heater see Figure 1 The pan should have a minimum length and width of at least 2 inches 51mm greater than the diameter of the heater and should be piped to an adequate drain Drain pans suitable for these heaters are available from your dealer or A O Smith Water Pr...

Page 5: ...UT OFF VALVE FROM THE GAS SUPPLY PIPING SYSTEM DURING ANY SUPPLY PRESSURE TESTING EXCEEDING 1 2 PSI 3 5 kPa GAS SUPPLY LINE MUST BE CAPPED WHEN DISCONNECTEDFROMTHEHEATER FORTESTPRESSURESAT 1 2 PSI 3 5 kPa OR LESS THE APPLIANCE NEED NOT BE DISCONNECTED BUT MUST BE ISOLATED FROM THE SUPPLY PRESSURETESTBYCLOSINGTHE MAIN MANUALGAS VALVE BEFORE PLACING THE HEATER IN OPERATION CHECK FOR GAS LEAKAGE USE ...

Page 6: ...ve any door window or gravity air inlet into the building see Figure 4 The Power Direct Vent outlet terminal of over 50 000 BtuH input models shall terminate at least 12 30 5 cm below 12 30 5 cm horizontally from or 12 30 5 cm above any door window or gravity air inlet into the building see Figure 4 18 45 7 cm minimum from other natural draft gravity direct vent power vent or power direct vent app...

Page 7: ...pported at 3 1 2 foot 8 9 cm intervals and vertical runs supported at 5 foot 1 5 cm intervals VENTING THROUGH AN OUTSIDE WALL A ALL 75 GAL 283 9L 65 000 70 000 BTU HR MODELS 50 GAL 189 3L 60 000 65 000BTU HRMODELS SEE FIGURE 10 In the carton is supplied 1 Two 3 inlet and outlet PVC Schedule 40 45 vent caps 2 A 3 ABS Schedule 40 90 street elbow used to connect the outlet vent pipe to the water heat...

Page 8: ... vent piping cannot under any circumstances be run downhill FIGURE 12 The vent piping can be installed as follows 1 Horizontal runs require a minimum1 8 3 2mm rise per 5 1 52 m FIGURE 13 FIGURE 14 FIGURE 15 2 The total vertical and horizontal vent runs cannot exceed the maximum length with the number of 90 elbows as specified in the table below If more elbows are required the venting distance must...

Page 9: ...mer cleaner 4 Apply a thin coat of cement to fitting avoiding puddling inside 5 Apply a liberal coat of cement to pipe leaving no voids 6 QUICKLY assemble parts while cement is fluid If you wait too long re coat pipes 7 Push pipe completely into socket of fitting turning as it goes until it bottoms 8 Hold pipe and fitting together for 30 seconds Then carefully clean off excess with a cloth Allow c...

Page 10: ...al 189 3 L Hi BTU input all 75 Gal 283 9 L Models only is supplied on certain models only More may be required and must be supplied locally 1 The water heater requires its own separate venting system 2 Only 3 ABS Schedule 40 piping and fittings are acceptable materials on the first 5 1 52 m of the outlet vent system for some 50 Gal 189 3 L and 75 Gal 283 9 L models 3 3 PVC ABS or CPVC Schedule 40 ...

Page 11: ...secure with screws FIGURE 24 SCHEMATIC DIAGRAMS FIGURE 25 WARNING DISCONNECT FROM ELECTRICAL SUPPLY BEFORE SERVICING UNIT REPLACE ALL DOORS AND PANELS BEFORE OPERATING HEATER IF ANY OF THE ORIGINAL WIRES SUPPLIED WITH THE APPLIANCE MUST BE REPLACED IT MUST BE REPLACED WITH APPLIANCE WIRE MATERIAL WITH MINIMUM TEMPERATURE RATING OF 105 C AND A MINIMUM SIZE OF NO 18 AWG FIGURE 26 T P VALVE AND PIPE ...

Page 12: ...cond Then press the COOLER button until the WARM indicator light appears BEFORE OPERATING ENTIRE SYSTEM MUST BE FILLED WITH WATERANDAIR PURGED FROMALL LINES 1 STOP Read the safety information above on this label 2 Set the ON OFF switch on the control box to the ON position 3 Set the thermostat to the lowest setting by first pressing the COOLER and HOTTER buttons together and holding for 1 second T...

Page 13: ...G OF GAS VALVE WILL REDUCE THE RISK OF SCALDS Some states require settings at specific lower temperatures Figure 28 shows the approximate water temperatures produced at various thermostat dial settings Short repeated heating cycles caused by small hot water uses can cause temperatures at the point of use to exceed the thermostat setting by up to 30 F 1 C If you experience this type of use you shou...

Page 14: ...onds Flame Recognition Period 1 second Ignition Trial 4 seconds Interpurge 5 seconds Post purge 5 seconds Retries 2 Reset from Lockout 1 hr Flame Sensing Nominal HSI Off Run Mode 4 0µ DC HIGH ALTITUDE INSTALLATION WARNING INSTALLATIONS ABOVE 2000 610 m FEET REQUIRE REPLACEMENT OF THE BURNER ORIFICE IN ACCORDANCE WITH THE NATIONAL FUEL GAS CODE ANSIZ223 1 NFPA54 FAILURE TOREPLACETHEORIFICEWILLRESUL...

Page 15: ...ING OUT OF THE VALVE DURING THIS CHECKING OPERATION MAY BE EXTREMELY HOT AVOID CONTACT AND DISCHARGE SAFELY TO PREVENT WATER DAMAGE DRAINING If the heater is to be shut off and exposed to freezing temperatures it must be drained Water if left in the tank and allowed to freeze will damage the heater Turn off the gas and cold water inlet valve to the heater Open a nearby hot water faucet and the hea...

Page 16: ...ontact your dealer or theA O Smith authorized service agent in your area and explain to them why you are not satisfied This will usually correct the problem If after working with your dealer or service agent the problem has not been resolved to your satisfaction please let us know by either writing to us at A O Smith Water Products Company Service Department 106 Adkisson St Ashland City TN 37015 o...

Page 17: ...s correct and secure 2 Replace hot surface igniter System in lockout 1 Gas supply is off or too low to operate 2 Hot surface igniter not positioned correctly 3 Low voltage to the water heater 4 Electric polarity to unit is incorrect test and correct Problem in the gas valve driver circuit 1 Turn power to the water heater off for 10 seconds and the back on 2 Replace gas control valve Problem with t...

Page 18: ...ice A Dirt in burner ports Turn off heater and gas clean burner head B Combustion air path restricted Check intake venting arrangements for YELLOWFLAME obstructions C Not enough dilution air for proper Check Intake venting arrangement for combustion obstructions A Water on the floor under heater See CONDENSATION section CONDENSATION B Water dripping from pan Provide drip TEE to catch condensation ...

Page 19: ...IBILITY UNDER THIS LIMITED WARRANTY THE WARRANTOR WILLPROVIDE ONLY A REPLACEMENT WATER HEATER OR PART THEREOF THE OWNER IS RESPONSIBLE FOR ALL OTHER COSTS Such costs may include but are not limited to LIMITED RESIDENTIAL GAS WARRANTY a Labor charges for service removal or reinstallation of the water heater or part thereof b Shipping and delivery charges for forwarding the new water heater or repla...

Page 20: ...20 125 SOUTHEAST PARKWAY FRANKLIN TN 37068 Phone 1 800 433 2545 Fax 1 800 433 2515 www aosmithwaterheaters com email parts hotwater com ...

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