45
8.2.2 - Temperature and pressure
Relief valve
This water heater is supplied with a Safety Temperature
and Pressure Relief valve which discharge connection
must be piped in accordance with the ANSI/ASME
Boiler and Pressure Vessel Code, Section IV, to prevent
scalding in the event of a discharge.
Pipe the discharge of the safety relief valve like on
Figures 8-2 or 8-3. to a suitable drain to prevent injury in
the event of pressure relief. Pipe the discharge to a drain.
Provide piping that is the same size as the safety relief
valve outlet.
WARNING!!!
Failure to properly pipe the
relief valve discharge can result in scalding of
individuals and animals.
WARNING!!!
Never block the outlet of
the safety relief valve or an explosion causing
extensive property damage, severe personal
injury or death may occur!
WARNING!!!
Never install any type of valve
between the water heater and the relief valve
or an explosion causing extensive property
damage, severe personal injury or death may
occur!
NOTICE! The separate storage vessel must have a
temperature and pressure relief valve installed. This
relief valve shall comply with the Standard for Relief
Valves for Hot Water Supply Systems, ANSI Z21.22 •
CSA 4.4.
NOTICE! If the relief valve discharges periodically, this
may be due to thermal expansion in a closed water
supply system. Contact the water supplier or local
plumbing inspector on how to correct this situation. Do
not plug the relief valve.
Key to Figures 8-2 and 8-3
E = ASME Safety Temperature and Pressure relief valve
F = Temperature and pressure gauge
G = Elbow (Field supplied)
H = Relief valve discharge piping (Field supplied)
L = Hot water outlet
H
G
L
010.01.008
F
E
H
L
F
E
G
H
F
E
G
H
G
020009.01.009
Figure 8-2 Piping of the P-T relief valve
discharge on models 199
Figure 8-3 Piping of the P-T relief valve
discharge on models 399 up to 1000
8 - INSTALLATION - IW water connections
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