Make sure no external pressure is applied to the terminal connectors.
When installing the ground fault circuit interrupter make sure that it is compatible with the inverter (resistant to high
frequency electrical noise) to avoid unnecessary opening of the ground fault circuit interrupter
This unit is equipped with an inverter. Installing a phase advancing capacitor not only reduce the power factor
improvement effect, but also may cause abnormal heating of the capacitor due to high frequency waves. Never
install a phase advancing capacitor as it could lead to an accident.
4.3
Guideless
Most field wiring on the unit is to be made on the terminal block inside the switch box. To gain access to the terminal
block, remove the switch box service panel.
Fix all cables using cable ties.
A dedicated power circuit is required for the backup electric heater.
Installation equipped with a domestic hot water tank (field supplied) requires a dedicated power circuit for the
immersion heater.
Secure the wiring in the order shown below:
Lay out the electrical wiring so that the front cover does not rise up when doing wiring work and attach the front
cover securely.
Follow the electric wiring diagrams for electrical wiring works. Refer to Figure 2-4.1, Figure 2-4.2 and Figure 2-4.3 in
part 2, 4 “Wiring Diagram”.
Install the wires and fix the cover firmly so that the cover may be fit in properly.
4.4
Wiring Overview
Figure 3-4.3: Wiring overview for 5/7kW models
Legend
A
Outdoor unit
I
P_d: DHW pump (field supplied)
B
Solar energy kit (field supplied)
J
SV2: Motorized 2-way valve (field supplied)
C
User interface
K
SV1: Motorized 3-way valve (field supplied)
D
Room thermostat (field supplied)
L
Domestic water tank (field supplied)
E
Auxiliary heating source (field supplied)
M
Immersion heater (field supplied)
F
P_s: Solar pump (field supplied)
N
Contactor (field supplied)
G
P_c: Mixing pump (field supplied)
O
Power supply
H
P_o: External circulator pump (field supplied)
P
Backup electric heater (customized)
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