Install Instructions

6
2. INSTALLATION – PIPING
A. TEMPERATURE & PRESSURE (T&P)
RELIEF VALVE
1 Every Peerless
®
Partner
®
water heater must be
protected with a T&P relief valve.
2 Determine T&P relief valve size by the following
specifications, unless they conflict with local codes:
a. Peerless
®
Partner
®
30/40/50: 3/4" NPT with an
AGA Rating of 100,000 BTU/hr and a maximum
pressure rating of 150 psig. (Watts 100XL-8 or
equivalent).
b. Peerless
®
Partner
®
60/80/100/120: 3/4" NPT with
an AGA Rating of 200,000 BTU/hr and a
maximum pressure rating of 150 psig. (Watts
40XL-8 or equivalent).
3. Standard Installation:
Install T&P relief valve in the Auxiliary connection
located behind the air vent on the top of the water
heater (Figure 3.1).
or
Install the T&P relief valve in the run (straight through
leg) of a tee located at the domestic hot water outlet
when using the Auxiliary connection for a
recirculation return (Figure 3.2).
4. Commonwealth of Massachusetts Installation:
Follow this procedure for jurisdictions requiring a
vacuum breaker to be installed on the domestic cold
water inlet.
• Install the T&P in the run (straight through leg) of
tee located at the domestic hot water outlet. Use a
long element T&P relief valve (Fig. 3.4).
5. T&P Relief Valve Discharge Piping:
T&P relief valve discharge piping must be:
• made of material serviceable for temperatures 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 discharge capacity.
• directly connected to a drain. Terminate the
discharge piping within 6" from a drain and within
6" of the floor. Refer to local codes.
• plugged, reduced or restricted.
• subject to freezing.
B. DRAIN VALVE
Drain valve and fittings are supplied by others.
1. Standard Installation
a. Install a tee connection at the domestic cold water
inlet (Fig. 3.1 and 3.2).
b. Pipe the drain piping with drain valve from the tee
connection to:
i. a suitable place for disposal
or
ii. terminate within 12" of the floor
2. Commonwealth of Massachusetts Installation
a. Use the drain tube assembly supplied in the tank
carton.
b. 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. 3.3.
c. Install a 3/4" NPT elbow to the Auxiliary
connection, see Fig. 3.4.
d. Pipe the drain piping with drain valve from the
elbow connection to:
To reduce risk of excessive pressures and
temperatures in the water heater, install temperature
and pressure protective equipment required by local
codes, but no less than a combination temperature
and pressure relief valve 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 Shutoff Devices for Hot
Water Supply Systems, ANSI Z21.22. This valve must
be marked with a maximum working pressure of the
water heater.
CAUTION
For proper operation of the T&P and to prevent the
T&P from activating due to boiler water temperature,
use a T&P relief valve with extended element.
Recommended, an 8" minimum length.
NOTICE
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.
WARNING
INSTALLATION - PIPING