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5

Important: 

 The water heater should be located in 

an area where leakage of the tank or connections will 
not result in damage to the area adjacent to the water 
heater or to lower floors of the structure. 

Due to the 

normal corrosive action of the water, the tank will 
eventually leak after an extended period of time. 
Also any external plumbing leak, including those 
from improper installation, may cause early failure 
of the tank due to corrosion if not repaired.  If the 
homeowner is uncomfortable with making the repair 
a qualified service technician should be contacted.

  

A suitable metal drain pan should be installed under 
the water heater as shown below, to help protect 
the property from damage which may occur from 
condensate formation or leaks in the piping connections 
or tank. The pan must limit the water level to a maximum 
depth of 1-3/4” and be two inches wider than the heater 
and piped to an adequate drain. 

The pan must not 

restrict combustion air flow. 

Locate the water heater 

near a suitable indoor drain. Outside drains are subject 
to freezing temperatures which can obstruct the drain 
line. The piping should be at least 3/4” ID and pitched 
for proper drainage. Under no circumstances will the 
manufacturer or seller of this water heater be held liable 
for any water damage which is caused by your failure to 
follow these instructions.

1 3/4” maximum

Pipe to

adequate

drain

At least 2” greater than the
diameter of the water heater.

Reverse flow 
of gases

Exhaust

Fan

Figure 1
Air-moving
Devices

Back

Sides

Sides

Top

View

Top

to

ceiling

Vent

Front
24” minimum
for service

Figure 2
Minimum Clearance
Locations

Clearances and Accessibility

Notice:

  Minimum clearances from combustible 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 installing over carpeting, the carpeting 

must be protected by a metal or wood panel beneath 
the water heater. The protective panel must extend 
beyond the full width and depth of the water heater by 
at least three inches (76.2mm) in any direction; or if in 
an alcove or closet installation, the entire floor must be 
covered by the panel. 

• 

Figure 2 may be used as a reference guide to locate 
the specific clearance locations. A minimum of 24 
inches of front clearance should be provided for 
inspection and service.

State of California
Note:

  The water heater must be braced, anchored, or 

strapped to avoid moving during an earthquake. 
Contact local utilities for code requirements in your area 
or call 

1-800-999-9515

 and request instructions.

• 

The water heater should be located in an area not 
subject to freezing temperatures. Water heaters located 
in unconditioned spaces (i.e., attics, basements, 
etc.) may require insulation of the water piping and 
drain piping to protect against freezing. The drain and 
controls must be easily accessible for operation and 
service. Maintain proper clearances as specified on the 
data plate.

• 

Do not locate the water heater near an air-moving 
device. The operation of air-moving devices such as 
exhaust fans, ventilation systems, clothes dryers, 
fire-places, etc., can affect the proper operation of 
the water heater. Special attention must be given to 
conditions these devices may create. Flow reversal of 
flue gases may cause an increase of carbon monoxide 
inside of the dwelling.

• 

If the water heater is located in an area that is 
subjected to lint, dirt, and oil, it may be necessary 
to periodically clean the flame-trap (see “External 
Inspection & Cleaning of the Flame-trap,” Page 22).

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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