American Standard PLC 100-76 Operation, Installation And Service Manual Download Page 8

Figure 1

Figure 2

Figure 3

Clearance/Flooring-

 If the water heater is installed directly on carpeting, it must be installed on a metal or wood panel which extends beyond 

the full width and depth of the water heater by at least 3 inches in any direction. If the water heater is installed in an alcove, the entire floor must 
be covered by the panel. A minimum of 24 inches front clearance shall be provided for inspection and servicing.

This water heater may be installed in an alcove on combustible flooring with clearances from combustible materials 

as shown in Figures 1 and 2. Tank Leg Thermal Breaks shall always be used when installed on combustible flooring.

For Vent Termination Horizontal 12” min. above grade/snow level.

REMEMBER: Flammable vapors may be drawn to this water heater from 
other areas of the structure by air currents.
NOTE: HEATER SHALL BE LOCATED OR PROTECTED SO IT IS NOT 
SUBJECT TO PHYSICAL DAMAGE BY MOVING VEHICLES OR AREA 
FLOODING.

Typical Installation in Residential Garages (Illustration copyright by the American 
Gas Association. Used by permission of the copyright holder.)

The National Fuel Gas Code (ANSI Z223.1 /NFPA 54) expressly prohibits the following:
a) Installation of a water heater in a bathroom, bedroom, or any occupied room normally kept closed.
b) Installation of a water heater in a garage, unless the unit is installed so that the burner and ignition devices are at least eighteen (18) inches above 
floor level and protected to avoid damage by moving vehicle. See Figure 3.

CAUTION

CLEARANCES FROM COMBUSTIBLE 
CONSTRUCTION

PLC 75 - 76

PLC 100 - 76

PLR 75 - 76

PLR 100 - 76

18”     2”      6”     6”

18”     2”      6”     6”

18”     2”      6”     6”

18”     2”      6”     6”

A       B       C      D

FRONT OPEN

CERTIFIED FOR INSTALLATION ON COMBUSTIBLE FLOOR*

*Tank Leg Thermal Breaks shall always be used when installed on combustible flooring.

CERTIFIED FOR ALCOVE INSTALLATION

B

B

B

D

C

D

A

A

Vehicle Stop

Garage

18”

4

3

GENERAL

INSPECT SHIPMENT: Inspect water heater for possible damage. If damaged, notify carrier immediately. Check markings on rating plate to make 
certain it corresponds with your application.

Read these instructions thoroughly before proceeding with the installation of this new gas-fired water heater. If there is any difficulty understanding 
all or any part of these instructions, it is recommended that a qualified service person perform the installation.

NOTICE: The manufacturer's warranty does not cover damage or injury cause by the use of any energy-saving devices (other than those authorized 
by the manufacturer) in conjunction with this water heater. The use of unauthorized energy-saving devices may decrease the life of the water heater 
and endanger life and/or property. The manufacturer will not be held liable for loss or injury resulting from the use of any unauthorized device in 
conjunction with this water heater.

This water heater has been equipped for use with one type of gas only. Compare the information provided on the rating plate affixed to the front 
of the water heater, making sure that the gas stated on the rating plate is the same as the gas to be used. DO NOT ATTEMPT TO USE THIS 
WATER HEATER WITH ANY GAS OTHER THAN THE TYPE LISTED ON THE RATING PLATE. Do not attempt to convert this water heater 
for use with a gas other than the type for which it is equipped. Failure to use the proper gas can create an unsafe condition resulting in property 
damage, bodily injury, or death. Consult local gas supplier or gas company if there are any questions.

For installations 2000 ft. and above, this water heater must be ordered from the supplier to the manufacturer's specifications for that particular 
altitude. Contact the company listed on the rating label when ordering high altitude constructed water heaters.

For any questions not covered in this booklet, contact your dealer or write to us at the address shown  the rating plate affixed to the front of the 
water heater.

This water heater has been designed and manufactured for the express purpose of heating and storing potable water and space heating. See page 
23 for space heating instructions. Any use other than this purpose will release the manufacturer from any liability or warranty claims stemming from 
the issue of this product. Consult local authorities.

INSTALLATION

Location-

 Select a location accessible to water lines, gas supply (type identified on the rating plate), an adequate open drain, and as close as practi-

cal to a chimney or gas vent. When installed, the water heater must be level. To prevent excessive heat loss through water piping, locate the water 
heater as close as practical to the areas of greatest hot water usage. Do not locate the water heater where lines could be subjected to freezing 
temperatures.

Adequate clearances shall be provided for easy access to controls by service personnel to enable proper cleaning, servicing, and operation of the 
water heater. Under no circumstances is the front of the water heater to be placed in a position where the burner tray assembly cannot slide out 
for removal when servicing.

DO NOT STORE OR USE FLAMMABLE LIQUIDS, VAPORS, OR MATERIALS IN THE VICINITY OF THIS OR ANY OTHER APPLIANCE.

CAUTION

IMPORTANT
 

BEFORE PROCEEDING WITH THE INSTALLATION OF THIS WATER HEATER, READ AND THOROUGHLY UNDERSTAND THESE 
INSTALLATION AND OPERATION INSTRUCTIONS. IF THERE ARE ANY QUESTIONS, THIS INSTALLATION SHOULD BE PERFORMED 
BY A QUALIFIED SERVICE PERSON.

When installed in combustible flooring, the tank leg thermal break piece identified as part No. 4 on the replacement part 

illustration ( Figure 17), must be installed under each leg.

Summary of Contents for PLC 100-76

Page 1: ...e Do not touch any electrical switch do not use any phone in your building Immediately call your gas supplier from a neighbor s phone Follow the gas supplier s instructions If you cannot reach your ga...

Page 2: ...OUR RECEIPT TO SHOW TO THE SERVICE PERSON IF SERVICE IS REQUIRED OPERATING INSTALLATION AND SERVICE MANUAL STORAGE TYPE GAS WATER HEATER WITH FLUE DAMPER WARNING If the information in these instructio...

Page 3: ...ts Water temperature over 125 F can cause severe burns instantly or death from scalds Children disabled and elderly are at highest risk of being scalded See instruction manual before setting temperatu...

Page 4: ...d replace anode Install in location with drainage Fill tank with water before operation Be alert for thermal expansion Refer to instrucion manual for installation and service Improper installation and...

Page 5: ...EATER WITH WATER INSTALLATION CHECK LIST NATURAL GAS MODELS L P PROPANE BOTTLED GAS MODELS OUT OF FUEL EXPOSURE TO WATER INSTRUCTIONS FOR CLEANING TANK TO RETURN WATER HEATER TO OPERATION VACATION COM...

Page 6: ...E THIS MANUAL HAS BEEN PREPARED TO ACQUAINT YOU WITH THE INSTALLATION OPERATION AND MAINTENANCE OF YOUR GAS WATER HEATER AND TO PROVIDE IMPORTANT SAFETY INFORMATION WE URGE YOU TO READ ALL INSTRUCTION...

Page 7: ...ion adjustment alteration service or maintenance can cause injury or property damage Refer to this manual For assistance or additional information consult a qualified installer service agency or the g...

Page 8: ...ude Contact the company listed on the rating label when ordering high altitude constructed water heaters For any questions not covered in this booklet contact your dealer or write to us at the address...

Page 9: ...rents NOTE HEATER SHALL BE LOCATED OR PROTECTED SO IT IS NOT SUBJECT TO PHYSICAL DAMAGE BY MOVING VEHICLES OR AREA FLOODING Typical Installation in Residential Garages Illustration copyright by the Am...

Page 10: ...the water heater and the combustion air inlet must be in the same atmospheric pressure zone Large exhaust fans in kitchens or other locations can lower the air pressure inside an enclosure and interfe...

Page 11: ...r to check the installation for venting and for spillage all around the draft hood relief opening after five minutes of operation the method to check for flue products spillage should utilize a flame...

Page 12: ...e a good grade of pipe joint compound Be familiar with the location of the shut off valve in the cold water line feeding the water heater See Figure 5 If a valve is not present one shall be installed...

Page 13: ...ft 91 cm above if within 10ft 3m Horizontally E Clearance to unventilated 12 in L Above paved sidewalk or paved driveway located on public property 7 ft 2 13 m for mechanical draft systems category I...

Page 14: ...H SUITABLE DRAIN OPEN DRAIN HAND HOLE CLEAN OUT T P RELIEFVALVE COLDWATER INLET SHUT OFFVALVE EXPANSIONTANK STORAGETANK CHECK VALVE DRAINVALVE Use an ExpansionTank in a closed water system ColdWater S...

Page 15: ...ff valve Shut off valve Shut off valve Shut off valve Bleed valve System return Union Union Expansion tank Water supply Back flow preventers PUMP SINGLE COMMERCIAL GAS MODEL TOP CONNECTIONS WITH RETUR...

Page 16: ...er commercial or household products When urned vapors from these products form highly corrosive acid compounds These products should not be stored or used near the water heater or air inlet Combustion...

Page 17: ...ommunicating with the outdoors through vertical ducts each opening shall have a minimum free area of 1 square inch per 4 000 BTU per hour of total input rating of all equipment in the enclosure Figure...

Page 18: ...equipment in the enclosure Illustration for Figures 6 9 copyright by the American Gas Association Used by permission of the copyright holder MECHANICAL EXHAUSTING AND FIREPLACES the operation of air...

Page 19: ...ground level will serve as pockets for accumulation of leaking gas Before lighting sniff at floor level IF YOU SMELL GAS follow applicable instructions on Front Cover or Page 21 DO NOT OPERATE APPLIAN...

Page 20: ...e cigar or pipe Do not smoke If hydrogen is present there will probably be an unusual sound such as air escaping through the faucet as the water begins to flow Remember no smoking or open flame near t...

Page 21: ...the water flow may cause property damage The discharge line 1 Must not be smaller than the pipe size of the relief valve 2 Must not be plugged or blocked 3 Must be of material capable of withstanding...

Page 22: ...ING THE HEATER WITH WATER 1 Close the heater drain valve by turning the handle to the right clockwise The drain valve is on the lower front of heater 2 Open the cold water supply valve to the heater 3...

Page 23: ...ure 5 Approved pipe joint compound used Soap and water solution used to check all connections and fittings for possible gas leaks The installer to visually determine that the main burner flames are bu...

Page 24: ...t FLOOR LEVEL IF YOU SMELL GAS FOLLOW THESE RULES 1 Open windows 2 Get all people out of the building 3 DO NOT light matches Extinguish any open flame 4 DO NOT touch electrical switches on or off 5 SH...

Page 25: ...dge 7 After tank has cooled remove loose scale and lime deposits from inside tank being careful not to break glass lining TO RETURN WATER HEATER TO OPERATION I Replace hand hole clean out gasket 2 Re...

Page 26: ...140 F a mixing valve or other means should be installed in the domestic potable hot water supply to limit the RISK OF SCALD DAMAGE SOME JURISDICTIONS may require a backflow preventer in the incoming c...

Page 27: ...D Do not use this appliance if any part has been under water Immediately call a qualified service technician to inspect the appliance and to replace any part of the control system and any gas control...

Page 28: ...IMIT The thermostat on this water heater is equipped with a high temperature limit switch ECO The ECO will shut off the gas supply to the burner and pilot in the event the water temperature exceeds 19...

Page 29: ...urner and pilot flames Observation of the gas flame should show the burner flame to be a soft blue with the suggestion of slight yellow tips It is to be noted that the flame of a light color may not b...

Page 30: ...d if being shut down during freezing temperatures Also periodic draining and cleaning of sediment from the tank may be necessary See Page 22 I Turn gas valve knob clockwise to the OFF position 2 Close...

Page 31: ...eplace with correct orifice Clear the area near the heater Check with utility Clean check for source of trouble correct Clean check for source of trouble correct Provide ventilation by use of louvers...

Page 32: ...ice too small Thermostat set too low Sediment or lime in tank Heater too small for job Wasted hot water Clear the area near the heater Check with utility Replace with correct orifice Turn temperature...

Page 33: ...number from the following list part description voltage and wattage when applicable It is imperative that replacement of main burner orifices pilot burner and gas valve be ordered for the gas type Nat...

Page 34: ...29 REPLACEMENT PARTS ILLUSTRATION STANDARD MODEL SHOWN Figure 17 1 2 3 4 5 6 7 8 9 10 11 12 13...

Page 35: ...NG POTABLE WATER HEATING SYSTEM WATER POTABLE HEATING AND SPACE HEATING NON SCALD TEMPERING VALVE SUGGESTED PIPING ARRANGEMENT FOR TOP CONNECTIONS TEMPERED POTABLE WATER COLD WATER INLET RETURN FROM H...

Page 36: ...REV APRIL 2021 ITEM 420011141900 561 New York Drive Pomona California 91768 Toll Free 800 900 9063 Fax 909 392 7302...

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