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4
Domestic side (tank) piping
Table 4A
Minimum Relief Valve (CSA Rating)
Model
SIT040DW
SIT050DW
SIT065DW
SIT080DW
SIT119DW
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.
Figure 4-2 Recommended Domestic Water Piping
TO BOILER
FROM BOILER
Please note that these illustrations are meant to show system piping concept only, the installer
NOTICE
is responsible for all equipment and detailing required by local codes.
Btu/hr
105,000
105,000
205,000
205,000
205,000
SHOCK ARRESTOR
UNION
(TYPICAL)
ANTI-SCALD
MIXING VALVE
SQUIRE
Installation & Operation Manual
(continued)
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.
Do not install any valve between the T&P
WARNING
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.
The T&P relief valve is not intended for
CAUTION
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.
Failure to install and maintain a new, listed
WARNING
3/4" X 3/4" T&P relief valve will release
the manufacturer from any claim which
might result from excessive temperature
and pressures.
SHUT-OFF VALVE
SHUT-OFF
VALVE
SHUT-OFF
VALVE
EXPANSION
TANK
TANK SENSOR/
AQUASTAT
CHECK VALVE
RECIRCULATION
PUMP
DRAIN
( FIELD SUPPLY)
SHUT-OFF
VALVE
BACKFLOW
PREVENTOR
13
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