Temperature And Pressure (T&P) Relief Valve; The Temperature And Pressure Relief Valve; The Discharge Line/Driptube; Temperature-Pressure Relief Valve And - John Wood JW6 F307 Installation And Operating Manual

Temperature And Pressure (T&P) Relief Valve
WARNING
For protection against excessive pressures and temperatures,
a temperature and pressure relief valve must be installed
in the opening marked "T&P RELIEF VALVE". This valve
must be design certified by a nationally recognized testing
laboratory that maintains periodic inspection of the production
of listed equipment or materials as meeting the requirements
of the "Standard For Relief Valves For Hot Water Supply
Systems", ANSI Z21.22/CSA 4.4". The function of the
temperature and pressure relief valve is to discharge water
in large quantities in the event of excessive temperature or
pressure developing in the water heater. The valve's relief
pressure must not exceed the working pressure of the water
heater as stated on the data plate.
A T&P valve is either installed or supplied loose with this
water heater.
Important: Only a new temperature and pressure relief valve
should be used with your water heater. Do not use an old or
existing valve as it may be damaged or not adequate for the
working pressure of the new 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.
Explosion Hazard
•
Temperature-pressure relief
valve must comply with ANSI
Z21.22-CSA4.4 and ASME
code.
•
Properly sized temperature-
pressure relief valve must be
installed in opening provided.
•
Do not plug, block, or cap the
discharge line.
•
Failure to follow this warning
can result in excessive tank
pressure, serious injury or
death.

The Discharge Line/Driptube:

CAUTION
Water Damage Hazard
Temperature-pressure relief valve discharge pipe
•
must terminate at an adequate drain.
•
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 discharge 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.
Failure to install and maintain a new, properly listed temperature
and pressure relief valve will release the manufacturer from
any claims which may result from excessive temperature or
water pressure.
DANGER
HOT
HOT
BURN
Temperature-Pressure Relief Valve And Pipe Insulation
On some water heater models, the T&P valve will be installed
and 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. If supplied loose, the T&P
valve must be installed in the location indicated on the water
heater and covered with insulation (supplied) as follows:
Manual Relief Lever
T&P Relief Valve
T&P Relief Valve
Drain Line
Figure 9 T&P Valve Insulation
Locate the temperature and pressure relief valve on the water
heater (also known as a T&P relief valve) (see Figure 9).
– 15 –
• Burn hazard.
• Hot water discharge.
• Keep clear of
temperature-pressure
relief valve discharge.
T&P Relief Valve Insulation
(Outlet opening on underside)