ELECTRICAL WIRING
All DSW were set correctly at factory, do not change settings of DSW. The following figures are only for
reference in installation. After installation, make sure all DSW were set as factory setting.
3.3.1 PCB Drawing
3.3.2 Factory Setting of Dip Switch (DSW)
DSW1: Capacity Settings
DSW
2: Optional Function Settings (1)
Setting
Position
ON
1
2
3
Setting
Position
ON
1
2
3
4
Setting
Position
ON
1
2
3
4
DSW
3: Optional Function Settings (2)
The PCB in the Unit is operating with 3 types of DIP switches. The location is as follows:
R
S
T
Mp
Unit Side
If each phase R, S or T of the power source is
incorrectly connected, the compressor does not
start due to the activation of the reverse & single
phase sequence protection relay. Therefore, in
order to check the correct wiring connection, the
utilization of a phase sequence indicator is
recommended when the unit is started after
installation of the unit.
(1) If the phase is wrong, exchange two of the
three wires connected from the main power
source to the main terminals of the unit as
indicated with dotted lines, and then check the
rotation direction of the phase sequence
indicator once again. Do not exchange the
wires in the unit in order to protect the
compressor against the reversal rotation.
3.2 Control Wiring
(2) Do not operate the compressor by depressing
the button of the magnetic switch for the
compressor.
Install the optional room thermostat at a suitable
location in the space to be air-conditioned.
Connect the control wires between the unit
terminals and the thermostat terminals according
to Fig. 6 or the wiring label.
A three-phase condenser fan motor is equipped;
therefore, the fan motor rotation should be
checked. Interchange two of the three main power
source wires, if incorrect rotation is detected
during initial start-up.
Power Source
Fig. 6. Field Wiring Connection
4
3.3 Printed Circuit Board (PCB) Layout
