Use and Care Manual

Phase III
®
5
Installation
T&P Relief Valve Discharge Piping
T&P relief valve discharge piping must be:
- made of material serviceable for tempera-
tures of 250ºF or greater.
- directed so that hot water flows away from
all persons.
- directed to a suitable place for disposal.
- installed so as to allow complete draining
of the T&P relief valve and discharge line.
T&P relief valve discharge piping must not
be:
- excessively long. Using more than 2
elbows or 15 feet of piping can reduce dis-
charge capacity.
- directly connected to a drain. Terminate
discharge piping within 6” from drain.
Refer to local codes.
- plugged, reduced or restricted.
- subject to freezing.
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 (Figures 1 and 2 pages 8 and 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
• Insert an open-end dip tube into the Auxiliary
connection on top of water heater.
• Install a 3/4” NPT elbow to the Auxiliary con-
nection (Figure 3).
• 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 1/2” x 1/8” reducer bushing provided with
water heater, using suitable pipe dope or tape.
3. Install automatic air vent provided with water
heater, using suitable pipe dope or tape.
4. Unscrew vent cap on air vent one full turn. Leave
cap unscrewed one turn for normal venting.
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.
CAUTION
WARNING