The Temperature And Pressure Relief Valve; The Discharge Line/Relief Drain Tube; Temperature-Pressure Relief Valve And Pipe; Insulation - John Wood POWER VENTED GAS FIRED WATER HEATER Installation And Operating Instructions Manual

Important: Only a new temperature and pressure relief valve
(supplied) should be used with your water heater. Do not place
any valve between the relief valve and the tank.

The Temperature and Pressure Relief Valve:

•
Must not be in contact with any electrical part.
•
Must be connected to an adequate discharge line.
•
Must not be rated higher than the working pressure
shown on the data plate of the water heater.
WARNING
Explosion Hazard
• If the temperature and pressure relief
valve is dripping or leaking, have a li-
censed plumber repair it..
• Do not plug valve.
• Do not remove valve.
• Failure to follow these instructions can
result in death or an explosion.

The Discharge Line/Relief Drain Tube:

•
Must not be smaller than the pipe size of the relief valve
or have any reducing coupling installed in the discharge
line.
•
Must not be capped, blocked, plugged or contain any
valve between the relief valve and the end of the dis-
charge line.
•
Must terminate a maximum of 300mm (12 in.) above the
floor.
•
Must be capable of withstanding 121°C (250°F) without
distortion.
•
Must be installed to allow complete drainage of both the
valve and discharge line.
The T&P valve shall be manually operated at least once a
year. Caution should be taken to ensure that no one is in
front of or around the outlet of the discharge line, and that the
water manually discharged will not cause any bodily injury or
property damage because the water may be extremely hot. If
after manually operating the valve, it fails to completely reset
and continues to release water, immediately close the cold-
water inlet to the water heater, follow the draining instructions
in this manual, and replace the temperature-pressure relief
valve with a properly rated/sized new one.

Temperature-Pressure Relief Valve and Pipe

Insulation

The T&P valve installed on this water heater is covered by
insulation to minimize heat loss. The insulation has a hole on
the bottom side to accommodate the valve outlet and allow
for the piping connection. Do not restrict the outlet opening
of the T&P valve.
Manual Relief Lever
T&P Relief Valve
T&P Relief Valve
Drain Line
Figure 29
Figure 30

Electrical Supply

Electrical Shock Hazard
• Disconnect power before ser-
• Replace all parts and panels
• Failure to do so can result in
Important: The electrical controls used inside the gas control/
thermostat of this water heater are polarity sensitive. Ensure
the electrical supply is connected correctly in the receptacle
box. Failure to connect correctly will prevent the unit from
functioning properly (see Figure 32). Before performing any
electrical service work, label all wires to avoid connection
errors. If wiring has to be replaced, use only TYPE TEW 105°C
wire, (except igniter wires). If there is a problem with igniter
wires, replace igniter assembly in its entirety. In locations
where a sump pump failure, fl ooding or exposure to water may
be present, a ground fault receptacle is recommended.
Important: Do not use an extension cord to connect the water
heater to an electrical outlet.
– 19 –
T&P Relief Valve Insulation
(Outlet opening on underside)
TEMPERATURE AND
PRESSURE RELIEF
VALVE
DISCHARGE LINE 19mm (3/4 in.)
MIN. DO NOT CAP OR PLUG.
DRAIN PAN. CONNECT TO
PROPERLY OPERATING
FLOOR DRAIN.
WARNING
vicing.

before operating.

death or electrical shock.