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4

Location Requirements

The Flame Guard

®

 Safety System is designed to reduce the 

risk of flammable vapor-related fires. The patented system 
protects your family by trapping the burning vapors within 
the water heater combustion chamber through the special 
flame-trap. The burning vapors literally “burn themselves 
out” without escaping back into the room. In the event of a 
flammable vapor incident, the Flame Guard

®

 Safety System 

shuts off the gas supply to the water heater’s burner and 
pilot, preventing re-ignition of any remaining flammable 
vapors in the area. This will disable the water heater until 
the system is reset. Note: Not following these instructions 
and/or an inadequate air supply can cause the Flame 
Guard

®

 Safety System to disable the water heater. Please 

make required installation and venting/air supply changes 
prior to resetting the system.

Important: This water heater has a resettable thermal 
switch installed as part of the Flame Guard

®

 Safety System. 

DO NOT attempt to disable or modify this feature in any 
way.

Do not use or store flammable products such as gasoline, 
solvents, or adhesives in the same room or area near the 
water heater. If such flammables must be used, all gas 
burning appliances in the vicinity must be shut off and their 
pilot lights extinguished. Open the doors and windows for 
ventilation while flammable substances are in use. 

If flammable liquids or vapors have spilled 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 
extinguished.

Do not store combustible materials (boxes, magazines, 
clothes, etc.) on or in close proximity to the water heater.

Site Location

• 

Select a location near the center of the water piping 
system. The water heater must be installed indoors 
and in a vertical position on a level surface. DO NOT 
install in bathrooms, bedrooms, or any occupied room 
normally kept closed.

• 

Locate the water heater as close to the chimney or gas 
vent as practical. Consider the vent system piping and 
combustion air supply requirements when selecting the 
water heater location. The venting system must be able 
to run from the water heater to termination with minimal 
length and elbows. 

• 

Locate the water heater near the existing gas piping. 
If installing a new gas line, locate the water heater to 
minimize the pipe length and elbows. 

Note:  This water heater 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.

Do not store or use gasoline or other 

flammable vapors and liquids in the 
vicinity of this or any other appliance. 
Storage of or use of gasoline or other 
flammable vapors or liquids in the 
vicinity of this or any other appliance can 
result in serious injury or death.

Flammable Vapors

FLAMMABLES

FIRE AND EXPLOSION HAZARD

Can result in serious injury or death

Read and follow water heater warnings 
and instructions. 

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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