Rinnai
25
Commercial Heat Pump OIM
Primary Pump
For those units without pump stalled inside the unit, the power to the primary pump for each heat pump is supplied
from the unit. Connect the active, neutral and earth wire to the pump terminals located within the heat pump
electrical enclosure marked “A3” and “N” as shown below.
IMPORTANT
For those units integrating pump inside the unit, please skip this step.
Tank Sensor Installation
Connect the supplied temperature sensor to the connection terminal marked
“1” and “2” (as shown above right) located within the electrical enclosure.
Run out the sensor to the nearest storage tanks and insert the sensor to the
thermostat well.
MUST
apply heat transfer sealant to the well prior to insert
the sensor.
Ensure the sensor is securely fitted to the well in the tank (see right).
Each Heat Pump should connect a temperature sensor.
Auxiliary Booster (optional)
If auxiliary booster control box is not provided, please skip this step.
Depending on the installation, an auxiliary booster control box may be supplied for supplementing heat at low
ambient temperature. Terminals “3” and “4” provide a power free signal to control the auxiliary booster (as shown
above right). Use a minimum 0.75mm
2
two-core cable (provided by installer) to wire to auxiliary booster control
box terminals. Refer the electric diagram of control box for wiring between the control box and auxiliary booster.
The auxiliary booster has been interlocked with the heat pump to only operate under low ambient or fault conditions.
•
When ambient temperature falls below 5°C, auxiliary booster is activated. The auxiliary booster will operate
until the set point reaches. Auxiliary booster will remain active until the ambient temperature reaches above
7°C. Heat pump and auxiliary booster may work simultaneously.
•
When ambient temperature falls below 0°C, heat pump is deactivated. Heat pump won’t activate until the
ambient temperature reaches above 2°C. Only the auxiliary booster will operate until the set point reaches.
•
When heap pump is in fault, auxiliary booster will operate instead of the heat pump until the set point
reaches. Auxiliary booster will remain active until the heat pump fault is cleared.
FILLING THE SYSTEM AND COMMISSIONING
If the heat pump is full of cold water, SWITCH ON the electrical supply at the isolating switch to the heat pump,
and SWITCH ON all breaks in the switchboard. The heat pump will start to heat up tanks automatically unless
the ambient temperature is below the ambient sensor set point, in which case the auxiliary booster will operate, if
installed.
Tank Sensor
Auxiliary Booster
Main Power
Primary Pump
Thermostat
well
Sensor
lead
INSTALLATION
