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16

Installation Checklist

Water Heater Location

  Centrally located with the water piping system. Located 

as close to the gas piping and vent pipe system as 
possible.

  Located indoors and in a vertical position. Protected 

from freezing temperatures.

  Proper clearances from combustible surfaces 

maintained and not installed directly on a carpeted floor.

  Provisions made to protect the area from water damage. 

Drain pan installed and piped to an adequate drain.

  Installation area free of corrosive elements and 

flammable materials.

  Sufficient room to service the water heater.

  Water heater not located near an air moving device.

  DO NOT install in bathrooms, bedrooms, or any 

occupied room normally kept closed.

Combustion Air Supply and Ventilation

  Sufficient fresh air supply for proper water heater 

operation.

  Fresh air not taken from areas that contain negative 

pressure producing devices such as exhaust fans, 
fireplaces, etc.

  Fresh air supply free of corrosive elements and 

flammable vapors.

  Fresh air openings sized correctly with consideration 

given to the blocking effect of louvers and grilles.

  Ductwork is the same cross-sectional area as the 

openings.

Vent Pipe System

 Drafthood 

properly 

installed.

  Vent connectors securely fastened with screws and 

supported properly to maintain six inch clearance.

  Vent connector made of approved material and sized 

correctly.

  Vent pipe system must be installed according to all 

local and state codes or, in the absence of local and 
state codes, the “National Fuel Gas Code”, ANSI 
Z223.1(NFPA 54)-latest edition.

  Flue baffle engaged in slots provided in the flue tube.

  Flue way, drafthood, or vent pipe system not obstructed 

in any way.

Water System Piping

  Temperature and pressure relief valve properly installed 

with a discharge line run to an open drain and protected 
from freezing.

  All piping properly installed and free of leaks.

  Heater completely filled with water.

  Closed system pressure build-up precautions installed.

  Tempering valve installed per manufacturer’s 

instructions, when applicable (See Water Temperature 
Regulation section.)

Gas Supply and Piping

  Gas supply is the same type as listed on the water heater 

data plate.

  Gas line equipped with shut-off valve, union, and  drip 

leg.

  Approved pipe joint compound used.

  Adequate pipe size and of approved material.

  An approved noncorrosive leak detection solution to 

check all connections and fittings for possible gas leaks. 
Correct any leak found.

Important Information About 
Your Water Heater

This gas water heater was manufactured to voluntary 
safety standards to reduce the likelihood of a flammable 
vapor ignition incident.  New technology used in meeting 
these standards makes this product less tolerant of 
installation errors or improper installation environments.  
Please review the following information and make any 
necessary installation upgrades or changes:

1.  Check for insufficient combustion air.  Insufficient 

air for the combustion of gas will result in the flame 
becoming “lazy,” thereby allowing heat to build up in 
the combustion chamber.  This excessive heat will 
cause a thermal switch on the door assembly to trip. 
Important: DO NOT attempt to disable or modify this 
feature in any way. Is the water heater installed in a 
closet or other small, enclosed space?  If so: 

• 

Is there an opening for make-up air to enter the 
room/area? 

• 

Is the opening of sufficient size?  Remember, 
if there are other gas-fired or air-consuming 
appliances in the same room, you need more 
make-up air.  Refer to the Location Requirements 
section of this water heater manual for specific 
requirements.

• 

Is there a furnace/air handler in the same room/
space as the water heater?  If so, has a return air 
duct system been attached that exits the room? 
If so, check for leaks on the air duct system. If no 
air duct system is present, correct immediately 
by contacting a local Heating, Ventilation, Air-
Conditioning & Refrigeration (HVAC-R) authorized 
service provider.   

2.  Check for proper drafting at the water heater draft 

hood.  Make sure all other appliances in the area are 
operating and all doors are closed when performing 
the draft test.  To perform the draft test, open a hot 
water faucet for 3-5 minutes or until the burner ignites, 
and then check for a draft at the inlet to the draft hood 
(top of the heater) using a match or small amount of 
smoke.  The smoke should be pulled into the draft 
hood.  If there is no draft:

• Recheck 

#1.

• 

Check the vent system for restrictions/obstructions 
and check the vent termination height.  Refer to 
the Air Supply and Ventilation section of this water 
heater manual for specific requirements.

3.  Is the installed environment dirty (excessive amounts 

of lint, dirt, dust, etc.)?  If so, make sure the flame 
arrestor located on the bottom of the water heater 
has been cleaned.  Refer to the Maintenance of your 
Water Heater section of this manual for information on 
cleaning the flame-trap.  

4.  Is it possible that flammable vapors entered the 

water heater and were ignited in the burner area (a 
flammable vapor incident)?  If a flammable vapor 
incident has occurred or if you are unsure whether it 
has, call the number below immediately.

Proper installation will ensure the safe, effective and 
efficient operation of the water heater.  Make sure that 
you review and follow the instructions in this manual. 
Questions? Call 1-800-999-9515.

Summary of Contents for 6510381

Page 1: ...med by a qualified installer service agency or the gas supplier WARNING If the information in these instructions is not followed exactly a fire or explosion may result causing property damage personal...

Page 2: ...as been under water Immediately call a qualified service technician Water heaters subjected to flood conditions or anytime the gas controls main burner or pilot have been submerged in water require re...

Page 3: ...y personnel a licensed plumber or an authorized service person Important This water heater has a resettable thermal switch installed as part of the Flame Guard Safety System DO NOT attempt to disable...

Page 4: ...led or leaked in the area of the water heater leave the area immediately and call the fire department from a neighbor s home Do not attempt to clean the spill until all ignition sources have been exti...

Page 5: ...stible materials are stated on the data plate adjacent to the gas control valve thermostat of the water heater The water heater is certified for installation on a combustible floor Important If instal...

Page 6: ...f the water heater as shown The drip leg must be no less than three inches long for the accumulation of dirt foreign material and water droplets Figure 3 Gas Piping Manual Gas Shut off Valve Ground Jo...

Page 7: ...areas Combustion air must be free of acid forming chemicals such as sulfur fluorine and chlorine These elements are found in aerosol sprays detergents bleaches cleaning solvents air fresheners paint a...

Page 8: ...an be drawn from outside of the enclosure One opening shall be within 12 inches of the top and one within 12 inches of the bottom of the enclosure as shown in Figure 4 The size of each opening free ar...

Page 9: ...supply openings consideration must be given to the blocking effect of protection louvers grilles and screens These devices can reduce airflow which in turn may require larger openings to achieve the...

Page 10: ...n existing water heater be sure to use the new drafthood supplied with the water heater Figure 9 Drafthood Installation Sheet Metal Screws four provided Drafthood Jacket top Install the drafthood with...

Page 11: ...erms of its listing It must be connected to the water heater s drafthood by a certified vent connector or by directly originating at the drafthood opening Vertical gas vents must terminate with a list...

Page 12: ...ine as shown in Figure 14 These valves reduce the point of use temperature of the water by mixing cold and hot water and are readily available for use 4 If installing the water heater in a closed wate...

Page 13: ...s DO NOT add any chemicals to the system piping which will contaminate the potable water supply Closed System Thermal Expansion Periodic discharge of the temperature and pressure relief valve may be d...

Page 14: ...higher than the working pressure shown on the data plate of the water heater The Discharge Line Must not be smaller than the pipe size of the relief valve or have any reducing coupling installed in th...

Page 15: ...the system Otherwise these bubbles will be trapped in the air handler heat exchanger coil reducing the efficiency Do not connect the water heater to any system or components previously used with non...

Page 16: ...reduce the likelihood of a flammable vapor ignition incident New technology used in meeting these standards makes this product less tolerant of installation errors or improper installation environmen...

Page 17: ...with the igniter repeat steps 4 7 Continue to hold the button for about 1 minute after the pilot is lit Release the reset button and it will pop back up Pilot should remain lit If the pilot light goe...

Page 18: ...r Temperature Regulation UNITROL BEFORE LIG HTIN G READ ALL IN STRUCTIO NS CAUTIO N H O T W A R M V A C A T I O N CAUTION W A TER INCREAS E S HOTTER T H E RISK OF SCALD INJ U R Y V A C A T I O N WAR M...

Page 19: ...rt on page 26 Reset the thermal switch by depressing the small button in the center of the thermal thermal switch Important Correct any issues prior to resetting the thermal switch DO NOT attempt to d...

Page 20: ...age or deterioration in the venting system Make sure the ventilation and combustion air supplies are not obstructed Build up of soot and carbon on the main burner and pilot burner Check for a soft blu...

Page 21: ...to see if it is dirty or clogged The burner may be cleaned with soap and hot water Figure 24 N O T W A H S T R E B O R I A C A V M R A W U T O H T H E R I SK OF Y R U J N I D L A C S R E T T O H W A...

Page 22: ...ly Page 23 Figure 25 Two Piece Wire Connector Assembly Two Piece Wire Connector Thermocouple Retainer Clip Manifold Door Other fittings not shown for clarity Pilot T ube Igniter Wire Figure 26 Thermoc...

Page 23: ...lve for leaks Test the supply connections by brushing on an approved noncorrosive leak detection solution Bubbles forming indicate a leak Correct any leak found 9 Follow the lighting instructions on p...

Page 24: ...ant The gas control valve thermostat is a standard valve with wire leads that connect to a thermal switch Removing the Gas Valve 1 On the gas control valve thermostat turn the temperature dial counter...

Page 25: ...te heater 7 Correct piping dip tube must be in cold inlet 8 Advise customer DRIP FROM RELIEF VALVE 1 Excessive water pressure 2 Heater stacking 3 Closed water system 1 Use a pressure reducing valve an...

Page 26: ...nstructions section of this manual for specific requirements NO Is the pilot tube damaged NO Does the flame trap show signs of discoloration and or debris Shut off the gas supply to the water heater a...

Page 27: ...y System parts Item No Parts Description 1 DRAFTHOOD 2 REDUCER RING SOME MODELS 3 FLUE BAFFLE 4 HEAT TRAP COLD SOME MODELS 5 HEAT TRAP HOT SOME MODELS 6 COLD WATER DIP TUBE 7 ANODE ROD 8 TEMPERATURE P...

Page 28: ...e wire connector with retainer clip thermal switch and pilot assembly Natural Gas Low Nox Item 17 Manifold door assembly which contains the manifold tube gasket door pilot tube thermocouple two piece...

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