ERQ125~250A7W1B
Inverter condensing unit
4PW51323-1C – 2018.04
Installation manual
11
Setting the cool/heat operation
1
Performing cool/heat setting with the remote controller
connected to the control box.
Keep the cool/heat selector switch (DS1) on the outdoor unit PC
board at the factory setting position IN/D UNIT.
2
Performing cool/heat setting with the cool/heat selector.
Connect the cool/heat selector remote controller (optional) to the
A/B/C terminals and set the cool/heat selector switch (DS1) on
the outdoor unit PC board (A1P) to OUT/D UNIT.
3
Perform cool/heat setting with the field supplied controller.
Set the cool/heat selector switch (DS1) on the outdoor unit PC
board (A1P) to OUT/D UNIT.
.
Connect the A/B/C terminals with the field supplied controller so
that:
- A/B/C terminals are not connected for cooling operation
- A and C terminals are short-circuited for heating operation
- B and C are short-circuited for fan only operation
8.8.
Field line connection: power wiring
The power cord must be clamped to the plastic bracket using field
supplied clamp material.
The green and yellow striped wrapped wires must be used for
grounding.
Be sure to keep the power line and transmission line
apart from each other.
Be careful about polarity of the transmission line.
Make sure that the transmission line is clamped as
shown in
Check that wiring lines do not make contact with
refrigerant piping.
Firmly close the lid and arrange the electrical wires so
as to prevent the lid or other parts from coming loose.
When you do not use a wire conduit, be sure to
protect the wires with vinyl tubes etc, to prevent the
edge of the knock-out hole from cutting the wires.
1
Remote controller
1
Cool/heat selector
For low-noise operation, it is necessary to get the optional
'External control adaptor for outdoor unit' (DTA104A61/62).
For details, see the installation manual attached to the
adaptor.
1
Power supply (400 V, 3N~ 50 Hz)
2
Fuse
3
Earth leakage breaker
4
Grounding wire
5
Power supply terminal block
6
Connect each power wire
RED to L1, WHT to L2, BLK to L3 and BLU to N
7
Ground wire (GRN/YLW)
8
Clamp the power wire to the plastic bracket using a field supplied
clamp to prevent external force being applied to the terminal.
9
Clamp (field supply)
10
Cup washer
11
When connecting the earth wire, it is recommended to perform
curling.
When routing ground wires, secure clearance of
50 mm or more away from compressor lead wires.
Failure to observe this instruction properly may
adversely effect correct operation of other units
connected to the same ground.
When connecting the power supply cord, the earth
connection must be made before the current-carrying
connections are established. When disconnecting the
power supply cord, the current-carrying connections
must be separated before the earth connection is.
Length of the conductors between the power supply
cord anchorage and the terminal block itself must be
such that the current-carrying conductors are
tautened before the earthing conductor is in case the
power supply cord is pulled loose from the cord
anchorage.
Precautions when laying power wiring
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.
Recommendations when connecting the ground
When pulling the ground wire out, wire it so that it comes
through the cut out section of the cup washer. (An
improper ground connection may prevent a good ground
from being achieved.)
Tightening torque (N•m)
M8 (Power terminal block)
5.5~7.3
M8 (Ground)
M3 (Inter-unit wiring terminal block)
0.8~0.97
4PWEN51323-1C_2018_04.book Page 11 Thursday, May 31, 2018 9:12 PM
