ERSQ+ERRQ011~Y1
Outdoor unit for air to water heat pump
4PW49635-1C
Installation manual
16
Field line connection: Control wiring
■
The wiring from the indoor unit must be connected to the F1/F2
(In-Out) terminals on the PC board in the outdoor unit.
■
After installing the interconnecting wires inside the unit, wrap
them along with the on-site refrigerant pipes using finishing tape,
as shown in the figure.
For the above wiring, always use vinyl cords with 0.75 to 1.25 mm
2
sheath or cables (2-core wires).
10. S
TART
-
UP
AND
CONFIGURATION
10.1. Pre-operation checks
After the installation, check the following before switching on the
circuit breaker:
1
Transportation stay
Be sure that the transportation stay is removed from the
compressor.
2
Power supply wiring and transmission wiring
Use a designated power supply and transmission wiring and
make sure that it has been carried out according to the
instructions described in this manual, according to the wiring
diagrams and according to local and national regulations.
3
Pipe sizes and pipe insulation
Make sure that correct pipe sizes are installed and that the
insulation work is properly executed.
4
Additional refrigerant charge
The amount of refrigerant to be added to the unit should be
written on the included "Added Refrigerant" plate and attached
to the rear side of the front cover.
5
Insulation test of the main power circuit
Using a megatester for 500
V, check that the insulation
resistance of 2 M
Ω
or more is attained by applying a voltage of
500 V DC between power terminals and earth. Never use the
megatester for the transmission wiring.
6
Stop valves
Be sure that the stop valves are open on both liquid and gas
side.
Precautions when laying power wiring
Use round pressure terminals for connections to the power
terminal block.
When none are available, follow the instructions below.
■
Do not connect wiring of different thicknesses to the
power terminal block. (Slack in the power wiring may
cause abnormal heat.)
■
When connecting wiring which is the same thickness,
do as shown in the figure below.
■
For wiring, use the designated power wire and
connect firmly, then secure to prevent outside
pressure being exerted on the terminal board.
■
Use an appropriate screwdriver for tightening the
terminal screws. A screwdriver with a small head will
strip the head and make proper tightening impossible.
■
Over-tightening the terminal screws may break them.
■
See the table below for tightening torque for the
terminal screws.
Be sure to follow the limits below. If the unit-to-unit cables
are beyond these limits, it may result in malfunction of
transmission.
Maximum wiring length: 300 m
Total wiring length: 600 m
1
2
1
Round pressure
terminal
2
Power wire
Tightening torque (N•m)
M5 (Power terminal block/ground wire)
2.39~2.92
M4 (Shielded ground)
1.18~1.44
M3.5 (Control wiring block)
0.79~0.97
1
2
3
4
5
4
1
Liquid pipe
2
Gas pipe
3
Interconnecting wiring
4
Insulator
5
Finishing tape
■
Make sure that the circuit breaker on the power supply
panel of the installation is switched off.
■
Attach the power wire securely.
■
Introducing power with a missing N-phase or with a
mistaken N-phase will break the equipment.
