A.O. Smith GPST-75L Owner'S Manual Download Page 1

Page: 1 / 20

PRINTED IN U.S.A. 0805

PART NO. 185388-000

KEEP THIS MANUAL IN THE POCKET ON THE HEATER FOR FUTURE REFERENCE

WHENEVER MAINTENANCE ADJUSTMENT OR SERVICE IS REQUIRED.

Power Vented Gas Models

GPSX

with Hot Surface Ignition

& 2"/3"/4" PVC Vent

Capability

Thank you for buying this energy efficient water heater from
A.O. Smith Water Products Company. We appreciate your
confidence in our product.

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.

CAUTION

TEXT PRINTED OR OUTLINED IN RED CONTAINS
INFORMATION RELATIVE TO YOUR SAFETY. PLEASE READ
THOROUGHLY BEFORE INSTALLING AND USING THIS
APPLIANCE.

OWNER'S MANUAL

GET TO KNOW YOUR WATER HEATER

GENERAL SAFETY INFORMATION

INSTALLATION

4-12

OPERATION & LIGHTING INSTRUCTIONS

12-15

MAINTENANCE

15-16

TROUBLESHOOTING

17-18

WARRANTY

TABLE OF CONTENTS

PAGE

RESIDENTIAL

GAS WATER HEATERS

A DIVISION OF A.O. SMITH CORPORATION

MCBEE, SOUTH CAROLINA

www.hotwater.com

Summary of Contents for GPST-75L

Page 1: ...e 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 CAUTION TEXT PRINTED OR OUTLINED IN RED CONTAINS INFORMATION RELATIVE TO YOUR SAFETY PLEASE READ THOROUGHLY BEFORE INSTALLING AND USING THIS APPLIANCE OWNER S MANUAL GET TO KNOWYOUR WATER HEATER 2 GENERAL SAFETYINFORMATION 3 IN...

Page 2: ...545 When ordering parts provide complete model and serial numbers see rating plate quantity and name of part desired as listed in Figure 1 Standard hardware items may be purchased locally FIGURE1 N COLDWATERINLET O INLETDIPTUBE P TEMPERATUREAND PRESSURERELIEFVALVE Q EMBLEMANDRATINGPLATE R INSULATION S VENTTERMINAL T DRAIN VALVE U HSI BURNERASSEMBLY V FLUE W DRAIN PAN X GAS VALVE Y CONTROL HARNESS ...

Page 3: ...eep it on the side of the water heater or nearby for future reference Do obtain new warning and instruction labels for placement on the blanket directly over the existing labels Do inspect the insulation blanket frequently to make certain it does not sag thereby obstructing combustion air flow GENERAL SAFETY INFORMATION EXTERNAL DAMAGE Do not operate the water heater until it has been fully checke...

Page 4: ...ng jurisdiction In the absence of local codes the installation must comply with the current editions of the National Fuel Gas Code ANSI Z223 1 NFPA 54 and the National Electrical Code NFPA 70 The former is available from the Canadian Standards Association 8501 East Pleasant Valley Road Cleveland OH 44131 and both documents are available from the National Fire Protection Association 1 Batterymarch ...

Page 5: ...l be suitable for use with potable water 2 Toxic chemicals 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 potable water heating appliance 4 When the system requires water for space heating at temperatures higher than required for domestic water purposes a ...

Page 6: ...23 1 NFPA54 7 3 4e and 7 8a b as follows 1 The exit terminals of a mechanical vent system shall be not less than 7 feet above grade when located adjacent to public walkways Figure 3 2 A venting system shall terminate at least 3 feet above any forced air inlet located within 10 feet Figure 3 3 The venting system shall terminate at least 4 feet below 4 feet horizontally from or 1 foot above any door...

Page 7: ...terminal to mount on the pipe Before the vent terminal is installed caulk not supplied around the pipe on the exterior wall and install the wall plate can be held to the outside wall by placing some of the caulking on the back of the plate The wall plate is supplied for decorative purposes only and is not a requirement for the vent termination if not needed by the installer SEQUENCEOFINSTALLATION ...

Page 8: ... SERVICING THIS UNITIS MANUFACTURED WITHAN EXTERNALCONTROL HARNESS FOR EASIER REPLACEMENT IF THE HARNESS OR CONNECTORS GET DAMAGED Do not plug in power cord until vent system is completely installed The Power Vent operates on 110 120 Vac therefore a grounded outlet must be within reach of the six 6 foot flexible power cord supplied with the unit see fig 1 The power cord supplied may be used only w...

Page 9: ...The vent piping should be connected to the blower with a rubber adapter and secured with hose clamps The adapter and clamps are provided with the heater 5 Even though the flue gas temperature leaving the blower is between 140 F and 175 F some installations will have water condense in the vent piping If this occurs then adequate means of draining and disposing of the condensate needs to be made by ...

Page 10: ...far the majority of failures in PVC and CPVC systems are the result of shortcuts and or improper joining techniques 2 SELECTIONOFMATERIALS Cutting Device Saw or Pipe Cutter Deburring Tool Knife File or Beveling Machine 2 and above Brush Pure Bristle Rag Cotton Not Synthetic Primer and Cleaner Solvent Cement PVC for PVC Components and CPVC for CPVC Components Containers Metal or Glass to hold Prime...

Page 11: ... fitting sockets and remove all dirt grease or moisture with a clean dry rag If wiping fails to clean the surfaces a chemical cleaner must be used Check for possible damage such as splits or cracks and replace if necessary Depth of entry Marking the depth of entry is a way to check if the pipe has reached the bottom of the fitting socket in Step F Measure the fitting depth and mark this distance o...

Page 12: ...hot water line Make sure that the insulation is against the top cover of the heater Fit T P valve insulation over valve Make sure that the insulation does not interfere with the lever of the T P valve Secure all insulation using tape OPERATION WARNING NEVER OPERATE THE HEATER WITHOUT FIRST BEING CERTAIN IT IS FILLED WITH WATER AND A TEMPERATURE AND PRESSURE RELIEF VALVE IS INSTALLED IN THE RELIEF ...

Page 13: ...OLER 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 Turn off all electric power to the appliance if service is to be performed BEFORE OPERATING ENTIRE SYSTEM MUST BE FILLED WITH WATERANDAIR PURGED FROMALL LINES 1 STOP Read the safety information above on...

Page 14: ... you experience this type of use you should consider using lower 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 attach to faucets to limit hot water temperatures Contact a licensed plumber or the local plumbing authority To avoid any unintentional chang...

Page 15: ...TY INFORMATION SECTION FIRST USERS OF THIS APPLIANCE SHOULD BE AWARE THAT GAS COMPONENTS WEAR OUT OVER A PERIOD OF TIME THE GAS CARRYING COMPONENTS OFTHISAPPLIANCE SHOULD BE INSPECTED FOR PROPER OPERATION PERIODICALLY BY A QUALIFIED SERVICE TECHNICIAN MAIN BURNER FIG 1 Check main burner every 12 months for proper flame characteristics This is done by removing door s on heater fig 1 The main burner...

Page 16: ...e 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 VALVETO CARRYTHE WATERAWAY DANGER THE WATER MAYBE HOT The drain valve must be left open during the shutdown period To resta...

Page 17: ... correct and secure 2 Replace hot surface ignitor System in lockout 1 Gas supply is off or too low to operate 2 Hot surface ignitor 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 th...

Page 18: ...ng and YELLOWFLAME air openings in bottom base pan for obstructions or blockage C Not enough dilution air for proper Check dilution air intake for obstructions combustion or blockage A Water on the floor under heater See CONDENSATION section B Water dripping from blower assembly Install condensate drain hose supplied locally CONDENSATION on drain port of rubber boot of blower assembly or provide a...

Page 19: ...tempt to repair tank leaks or parts will void this warranty SERVICEANDLABORRESPONSIBILITY UNDERTHISLIMITEDWARRANTY THEWARRANTORWILLPROVIDE ONLYAREPLACEMENTWATERHEATERORPARTTHEREOF THEOWNER ISRESPONSIBLEFORALLOTHERCOSTS Suchcostsmayincludebut are not limited to a Labor charges for service removal or reinstallation of the water heater or part thereof LIMITED RESIDENTIAL GAS WARRANTY b Shipping and d...

Page 20: ...20 5621 W 115TH STREET ALSIP IL 60803 PHONE 1 800 433 2545 FAX 1 800 433 2515 www hotwater com E mail parts hotwater com REPLACEMENT PARTS ...

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