Installation & Operation Manual
Standard installation
•
Install the T&P relief valve in the connection marked
“Relief
Valve”.
T&P relief valve discharge piping
T&P relief valve discharge piping
MUST
be:
- made of material serviceable for a temperature of
250°F 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.
- terminated within 6" of the floor.
WARNING
Do not install any valve between the T&P
relief valve and the tank connection or
on the T&P relief valve discharge piping.
Improper placement and piping of T&P
relief valve can cause severe personal injury,
death or substantial property damage.
CAUTION
The 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 a domestic
water system. Refer to the expansion tank
manufacturer’s installation instructions for
proper sizing.
4
Domestic side (tank) piping
(continued)
WARNING
Failure to install and maintain a new, listed
3/4" X 3/4" T&P relief valve will release
the manufacturer from any claim which
might result from excessive temperature
and pressures.
Table 4A
Minimum Relief Valve (CSA Rating)
Model
Btu/hr
SIT040DW
105,000
SIT050DW
105,000
SIT065DW
205,000
SIT080DW
205,000
SIT119DW
205,000
Figure 4-2 Recommended Domestic Water Piping
T&P relief valve discharge piping
MUST NOT
be:
- excessively long. Using more than two (2) elbows or 15
feet of piping can reduce discharge capacity.
- directly connected to a drain. Refer to local codes.
- subject to freezing.
EXPANSION
TANK
UNION
(TYPICAL)
SHOCK ARRESTOR
SHUT-OFF VALVE
SHUT-OFF
VALVE
BACKFLOW
PREVENTOR
SHUT-OFF
VALVE
SHUT-OFF
VALVE
ANTI-SCALD
MIXING VALVE
DRAIN
( FIELD SUPPLY)
RECIRCULATION
PUMP
TO BOILER
FROM BOILER
CHECK VALVE
TANK SENSOR/
AQUASTAT
SQUIRE
13
Please note that these illustrations are meant to show system piping concept only, the installer
is responsible for all equipment and detailing required by local codes.
NOTICE
