A.O. Smith GPS-75 Owner'S Manual Download Page 16

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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 heater drain valve.

BE CAREFUL TO GRASP THE DRAIN VALVE HANDLE SO
THAT THE HAND IS NOT EXPOSED TO HOT WATER.  IF
DESIRED, A HOSE MAY BE CONNECTED TO THE DRAIN
VALVE TO CARRY THE WATER AWAY.

 

  WARNING:  The water CAN BE HOT.

The drain valve must be left open during the shutdown period.

• To restart heater, refer to the instructions under OPERATION.

CONDENSATION

Water vapor can condense on the cooler surfaces of the tank
forming droplets, these drip into the fire or run out on the floor.
This is common at the time of startup after installation, during
periods of time when incoming water is very cold, or if the water
heater is undersized for the application.

Droplets from the bottom of the flue may be due to corrosive
combustion products or improper vent.  Check with your dealer
for more information.

CATHODIC PROTECTION-ANODE

The anode rod is used to protect the tank from corrosion.  Most
hot water tanks are equipped with an anode rod.  The
submerged rod sacrifices itself to protect the tank.  Instead of
corroding the tank, water ions attack and eat away the anode
rod.  This does not affect the water’s taste or color.  The rod must
be maintained to keep the tank in operating condition.

Anode deterioration depends on water conductivity, not
necessarily water condition.  A corroded or pitted anode rod
indicates high water conductivity and should be checked and/or
replaced more often than an anode rod that appears to be intact.
Replacement of a depleted anode rod can extend the life of your
water heater.  Inspection should be conducted by a qualified
technician, and at a minimum should be checked annually after
the warranty period.

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 must remain installed (except for inspection) to

avoid shortening tank life.  See LIMITED WARRANTY.  Replace
as necessary.

SERVICE AND REPAIR

The 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 water heater and are not
pleased with the service you received:

First, please contact your dealer or the 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 going to our website and e-mailing us or by
addressing an envelope to the manufacturer listed on the
rating plate at:

Service Department
500 Tennessee Waltz Parkway
Ashland City, TN 37015-1299

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.

TROUBLE SHOOTING

Water heater may exhibit problems that are unrelated to a
malfunction of the water heater itself.  The following information
and tables may serve to answer your question about a problem
that you are having without having to call a service agent.

For your safety, water heater service should be performed only
by a qualified service technician.  Read the GENERAL SAFETY
INFORMATION section first.

WATER HEATING IGNITION SEQUENCE

(Make sure gas and electric power are connected properly)

1) The ignition control module is powered and monitors the

system, waiting for a call for heat from the thermostat.

2) The thermostat calls for heat by reading a resistance value

within a given range directly proportional to water temperature.

3) The Control Module:

a) Check the pressure switches for an open circuit.
b) Energizes the blower.
c)

Checks the pressure switches for a closed circuit to prove
draft.

d) Sends line voltage to the hot surface igniter with a 20-

second warm up period.

e) Opens the gas valve and check the sensing rod for flame.

4) The burner heats the water to the desired thermostat setting.

a) The resistance in the thermostat rises to the value

selected by the temperature control knob.

b) The control module closes the gas valve and 5 seconds

later, removes power from the blower.

5) Cycle is completed.

Summary of Contents for GPS-75

Page 1: ...as well as the WARNINGS and CAUTIONS CAUTION TEXT PRINTED OR OUTLINED IN RED CONTAINS INFORMATION RELATIVE TO YOUR SAFETY PLEASE READ THOROUGHLY BEFORE INSTALLINGAND USING THISAPPLIANCE GAS WATER HEA...

Page 2: ...manufacturer by calling 1 800 821 2017 When ordering parts provide complete model and serial numbers see rating plate quantity and name of part desired as listed in fig 1 Standard hardware items may b...

Page 3: ...to find the cause yourself Go to a neighbor s house leaving your doors open to ventilate the house then call your gas supplier or service agent Keep area clear until a service call has been made At ti...

Page 4: ...e clearance for servicing this appliance should be considered before installation such as changing the anodes etc Minimum clearances for proper operation are given above WARNING In cold climates provi...

Page 5: ...micals such as those used for boiler treatment shall NEVER be introduced into this system 3 This unit may NEVER be connected to any existing heating system or component s previously used with a non po...

Page 6: ...ns in this manual or on water heater With main burner in operation paint pipe joints including flanges and control inlet and outlet with rich soap and water solution Bubbles indicate gas leak To stop...

Page 7: ...ower vented appliances are classified by building codes as vent connectors Required clearances from combustible materials must be provided in accordance with information in this manual under LOCATION...

Page 8: ...to the built in drain port of the rubber boot on the blower assembly For your convenience the rubber boot is supplied with a removable cap on the built in drain port Prior to operating the water heat...

Page 9: ...enclosure E Splice field wiring into existing wiring using code authorized method wire nuts etc F Be certain that neutral and line connections are not reversed when making these connections G Ground h...

Page 10: ...be supported every 5 feet of vertical run and every 3 feet of horizontal run All piping and fittings must be joined by the proper procedures as described under VENT PIPE PREPARATION FIGURE9 IMPORTANT...

Page 11: ...type of cutter is used the flare on the end must be completely removed STEP A NOTE Power saws should be specifically designed to cut plastic pipe B Deburring Use a knife plastic pipe deburring tool or...

Page 12: ...ld not be disturbed immediately after the cementing procedure and sufficient time should be allowed for proper curing of the joint Exact drying time is difficult to predict because it depends on varia...

Page 13: ...LER and HOTTER buttons together and holding for 1 second Then press the COOLER button until the WARM indicator light appears 2 Set the ON OFF switch on the blower control box to the OFF position 3 Tur...

Page 14: ...temperature settings to reduce scald hazards Valves for reducing the point of use temperature by mixing cold and hot water are available See figure 2 Also available are inexpensive devices that attac...

Page 15: ...t if necessary to keep burner in operation C CHECKINGTHE DRAFT Operate the water heater for several minutes and check to see if it is venting properly by passing a lit match or paper near the opening...

Page 16: ...d 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...

Page 17: ...lower back into 115 vac outlet Repair service to outlet Replace switch Replace control harness Replace blower and motor Replace switch Check for low voltage less than 102 vac have service checked and...

Page 18: ...water heater off for 10 seconds and then back on 2 Replace gas control valve Problem with the internal circuit 1 Turn power to the water heater off for 10 seconds and then back on 2 Replace gas contr...

Page 19: ...NDLABORRESPONSIBILITY UNDER THIS LIMITED WARRANTY THE WARRANTOR WILL PROVIDE ONLYAREPLACEMENTWATERHEATERORPARTTHEREOF THEOWNER IS RESPONSIBLE FOR ALLOTHER COSTS Such costs may include but are not limi...

Page 20: ...20 A O SMITH WATER PRODUCTS CO INC 500 Tennessee Waltz Parkway Ashland City TN 37015 Phone 1 800 821 2017 Website www hotwater com...

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