Rheem MPi Series Installation Instructions Manual page 33

COMMISSIONING
The system will not switch back to heat pump operation from the booster
heating unit if the detected ambient air temperature has moved back within the
heat pump‟s operating temperature range. The heating cycle will be completed
by the booster heating unit.
Note: The heat pump may not turn on after either having just completed a
heating cycle and more hot water is drawn from the water heater or power is
shut down to the compressor, either during or at the end of a heating cycle. The
heat pump will wait until the compressor has cooled down and the conditions
for start up are favourable in order to protect the compressor from damage.
This will be a minimum of forty five (45) minutes and may take up to
ninety (90) minutes from the last heating cycle.
It is important to wait for five (5) minutes after the heat pump has activated to
ensure it continues to operate and is functioning correctly.
Explain to the householder or a responsible officer the functions and operation
of the heat pump water heater. Upon completion of the installation and
commissioning of the water heating system, leave this guide with the
householder or a responsible officer.
TO TURN OFF THE WATER HEATER
"To Turn Off the Water Heater"
Refer to on page 8.
DIAGNOSTIC FEATURES OF THE HEAT PUMP CONTROLLER
An operating mode monitor is located on the front of the heat pump module and
houses a green and a red LED.
The green LED, marked "NORMAL", indicates the current operating mode (with
the red LED off) of the heat pump water heater and the red LED, marked
"ATTENTION", may indicate a potential fault mode.
The green LED will emit either a
constant glow or a series of flashes,
with a 2 second interval between
each series. A series of long green
flashes may also be emitted.
The red LED will emit either a solid glow or a series of flashes, with a 2 second
interval between each series. A series of flashes indicates there may be a
particular fault condition with the system.
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