Installation - Piping
5
Do not install any valve between T&P relief
valve and tank connection or on T&P relief
valve discharge piping. Do not plug T&P
relief valve or discharge piping. Improper
placement and piping of T&P relief valve
can cause severe personal injury, death or
substantial property damage.
Drain Valve
Drain valve and fittings are supplied by others.
Standard Installation
• Install a tee connection at the domestic cold
water inlet (Fig. 1 and 2 page 8 and Fig. 2A
on page 9).
• Pipe the drain piping with drain valve from
the tee connection to:
- a suitable place for disposal
or
- terminate within 12” of the floor
Commonwealth of Massachusetts Installation
• Thread a 3/4” close nipple onto the
Auxiliary connection and insert an open-
end dip tube into the Auxiliary connection
on top of water heater. As shown in Fig. 3A
page 9.
• Install a 3/4” NPT elbow to the Auxiliary
connection, see Fig. 3B page 10.
• Pipe the drain piping with drain valve from
the elbow connection to:
- a suitable place for disposal
or
- terminate within 12” of the floor
Automatic Air Vent
1. Remove plastic shipping cap from 1/2” NPT
pipe fitting on top center of water heater.
2. Install automatic air vent provided with water
heater, using suitable pipe dope or tape.
3. Once the tank is full and air has stop escaping and
air vent is seated and closed, screw the vent cap
completely close.
For proper operation of the air vent ensure
vent cap is tighten at all times. The air vent is
provided both a hygroscopic cap that prevents
leakage of water due to an internal membrane.
Thermal Expansion
If a backflow preventer, check valve or pressure
reducing valve is piped on cold water supply piping
of water heater, install an expansion tank on cold
water supply line to prevent normal thermal expan-
sion from repeatedly forcing open T&P relief valve.
T&P relief valve is not intended for constant
duty, such as relief of pressure due to
repeated normal system expansion. Correct
this condition by installing a properly sized
expansion tank in domestic water system.
Refer to expansion tank manufacturer’s
installation instructions for proper sizing.
Water Hammer
Dishwashers, clothes washers and fast-closing pos-
itive shut-off valves incorporated in the system all
contribute to creating water shock. Install a water
hammer arrester to prevent damage to pipes and
appliances. See device manufacturer’s instructions
for application and installation.
CAUTION
WARNING
NOTICE
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