Commercial Air to Water Heat Pump Water Heater
10
REGULAR CARE
TEMPERATURE AND PRESSURE
RELIEF VALVE EXPANSION
CONTROL VALVE AND
EXPANSION TANK
A temperature and pressure relief valve should be used
with the storage tanks. In many areas, an expansion con-
trol valve or expansion control tank is also fitted to the
cold water line to the water heater system. The expansion
control valve may discharge a small quantity of water from
its drain line during the heating period instead of the tem-
perature pressure relief valve on the storage tanks.
Operate the easing lever on the temperature and pres-
sure relief valve and expansion control valve. It is very
important you raise and lower the lever gently.
WARNING: Exercise care to avoid any
splashing of water, as water discharged from
the drain line will be hot. Stand clear of the
drain line’s point of discharge when operating
the valve’s lever.
If water does not flow freely from the drain line when the
lever is lifted, then the water heater must be checked con-
tact a local service technician to arrange for an inspection.
The temperature and pressure relief and expansion con-
trol valve or expansion control tank should be replaced
at intervals not exceeding 5 years, or more frequently in
areas where there is a high incidence of water deposits
(refer to “Water Supplies” section).
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