Commercial Air to Water Heat Pump Water Heater
55
COMMISSIONING
DRAINING THE WATER HEATER
To Turn Off The Water Heater
If it is necessary to turn off the water heater on completion
of the installation, such as on a building site or where the
premises are vacant, then:
• Switch off the electrical supply at the isolating
switch to the water heater.
• Close the cold water isolation valve at the inlet to
the system.
To drain the water heater:
• Turn off the water heater (refer to “To Turn Off The
Water Heater” on page 56.
• Close all hot water taps.
• Operate the relief valve release lever on one of
the storage tanks - do not let the lever snap back
or you will damage the valve seat.
• Operating the lever will release the pressure in
the water heater.
• Close the isolation valves at the inlet and outlet
of the water heater and place a bucket under the
cold water inlet.
• Undo the unions at the inlet and outlet of the wa-
ter heater. The heat pump heat exchanger holds
1.3 to 2.6 gallons of water (model dependent)
and will drain into the bucket.
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