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Use
3.3 Closed system thermal expansion
Periodic discharge of the temperature and pressure
relief valve or failure of the element gasket may be
due to thermal expansion in a closed water supply
system. The water utility supply meter may contain
a check valve, backflow preventer or water pressure
reducing valve which will create a closed water
system.
During the heating cycle of the water heater, the
water expands causing pressure inside the water
heater to increase.
The temperature and pressure relief valve may
discharge hot water under these conditions which
results in a loss of energy and a build-up of lime on
the relief valve seat.
The temperature and pressure relief valve may
discharge hot water under these conditions which
results in a loss of energy and a build-up of lime on
the relief valve seat.
To prevent this from happening, there are two
recommendations:
Install a diaphragm-type expansion tank that is
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suitable for potable water on the cold water
supply line. A minimum 0.5 gallon expansion
tank should be used.
Contact the local water supplier or plumbing
inspector for information on how to control this
situation. Do not plug the temperature and pressure
relief valve.
4 Use
4.1 Starting and testing
CAUTION
DO NOT supply power to water heater until
filled with water.
To fill the heater:
Open supply valve for water heater to fill with
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water.
Open hot water tap(s) supplied by the water
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heater to purge air out of the system. Once air is
purged, close hot water tap.
Visually check for any leaks.
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Turning heater on
For models which are not fitted with a switch:
Supply power to the water heater by plugging in
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the power cord.
If the light does not come on, turn the control
knob in a clockwise direction.
The light will come on until water temperature
has reached the thermostat temperature setting.
The light will come back on any time the water
temperature inside the tank drops below the
thermostat setting.
DANGER
If user's water pressure is high, TP valve
may relieve pressure under high pressure
during the heating process, water
temperature will be over 145 °F after
pressure relief, which can cause severe
burns instantly or death from scalds. Please
take attention!
4.2 Temperature setting
To fill the heater:
The temperature of the hot water is adjusted by
rotating the knob M (Fig.5) located on the front
cover. Temperature range is 55-145 °F.
Turn the knob clockwise to increase
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temperature.
Turn the knob counter-clockwise to decrease
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temperature.
S
Fig. 5
C
M
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