Service manual

150158 Rev. 2 August - 2010
8
FIGURE 8
WARNING
Do not attempt to operate this water heater with the cold water
inlet valve closed. Manually operate the pressure-temperature
relief valve at least once a year. To prevent water damage,
discharge line must terminate at an adequate drain. Standing
clear of the outlet (discharge water may be hot), lift and release
the lever handle on the pressure-temperature relief valve to
make the valve operate freely.
If the temperature and pressure relief valve on the appliance
discharges periodically, this may be due to thermal expansion
in a closed water supply system (see “Pressure Build-Up in
Water System” - Page 1). Contact the water supplier or local
plumbing inspector on how to correct this situation. Do not
plug the temperature and pressure relief valve.
that no contact is made with any live electrical part. Do not
connect discharge line directly to drain. (Figure 5)
To prevent bodily injury, hazard to life or damage to property,
the relief valve must be allowed to discharge water in the event
of excessive temperature or pressure developing in the water
heater. The function of the temperature and pressure relief
valve is to discharge water in large quantities should
circumstances demand. If the discharge pipe is not directed to
a drain as shown in Figure 5, or other suitable means, 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 210°F
without distortion,
(4) Must be installed so as to allow complete drainage of both
the temperature and pressure relief valve and discharge line,
(5) Must terminate at an adequate drain (Figure 5)
(6) Must not have any valve between the relief valve and the
end of the discharge line.
Failure to install and maintain a new properly listed
temperature and pressure relief valve will release the
manufacturer from any claim which might result from
excessive temperature or water pressure.
FIGURE 7
WARNING
HYDROGEN GAS
Hydrogen gas can be produced in a hot water system that has
not been used for a long period of time (generally two weeks
or more).
HYDROGEN GAS IS EXTREMELY
FLAMMABLE.
To prevent the possibility of injury under
these conditions, we recommend the hot water faucet be
opened for several minutes at the kitchen sink before you use
any electrical appliance which is connected to the hot water
system. Do not light a cigarette, 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 the faucet at
the time it is opened.
TEMPERATURE AND
PRESSURE RELIEF VALVE
For protection against excessive pressures and/or tempera-
tures, a temperature and pressure relief valve must be installed
in the opening marked “temperature and pressure relief valve”.
A design certified by a nationally recognized testing laboratory
that maintains periodic inspection of production of listed
equipment or materials, as meeting the requirements for Relief
Valves and Automatic Gas Shut-off devices for Hot Water
Supply Systems, ANSI Z21.22. Pressure rating of the valve
must not exceed the working pressure shown on the rating
plate of the water heater. Relief piping must terminate 6
inches above a floor drain or external to the building. Do not
thread, cap, or plug the end of this discharge line. Be certain
INSTALLATION
Using Top Connect Only