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The 3-phase auxiliary relay box must be directly connected to a 415 V AC 50 Hz mains power
supply. The 3-phase auxiliary relay box must be on its own circuit with an isolating switch installed
at the switchboard. A secondary isolating switch must be installed within reach of the box.
IMPORTANT
Connect all ACTIVE and NEUTRAL wires in accordance with the wiring diagram. Ensure the
incoming EARTH wire is securely fixed to the earth post.
Select suitable cable size according to the electric element capacity of the tank. Normally each
3-phase auxiliary relay box works with one electric tank.
NOTE
AUXILIARY BOOSTER SIGNAL
Wire terminals "3" and "4" to heat pump with a minimum 0.75mm
length should be less than 10 metres.
POWER SUPPLY TO ELECTRIC TANK
Connect all active, neutral and earth wires directly from the contactor or terminals and wire to electric tank. Normally
each 3-phase auxiliary relay box works with one electric tank. Refer to the electric tank wiring diagram for tank
wiring.
Rinnai
L1
L2 L3
To Electric Tank
5
two-core cable (provided by installer). The cable
2
3 4
L1
N
Main Power Supply
To Heat
Pump
BASIC OPERATION
L2 L3
N
3PH Auxiliary Relay Box OIM
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