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5 Installation
NOTICE
The operation output P1/P2 of the outdoor unit must be
connected to all solenoid valves that are installed upstream
of the expansion valves at the indoor unit. This connection
is required because the outdoor unit must be able to
control the solenoid valves during startup (to prevent liquid
refrigerant from entering the compressor) and oil return
operation.
NOTICE
Remote operation switch. The unit is factory-equipped
with an operation switch with which you can turn unit
operation ON/OFF. If you want to remotely turn outdoor
unit operation ON/OFF, a remote operation switch is
required. Use a voltage-free contact for microcurrent
(≤1 mA, 12 V DC). Connect to X2M/C+D, and set to
"Remote ".
NOTICE
Low-noise switch. If you want to remotely turn ON/OFF
low-noise operation (see setting [2‑18]), you must install a
low-noise
switch.
Use
microcurrent (≤1 mA, 12 V DC). Connect to X2M/A+B.
NOTICE
Output signals. The outdoor unit is provided with a
terminal (X3M) that can output 4 different signals. The
signal is 220~240 V AC. The maximum load for all signals
is 0.5 A. The unit outputs a signal in the following
situations:
▪ C/C1: caution signal – connection recommended –
when an error occurs that does not stop unit operation.
▪ C/W1: warning signal – connection recommended –
when an error occurs that causes unit operation to
stop.
▪ R/P2: run signal – connection optional – when the
compressor is running.
▪ P1/P2: operation signal – connection mandatory –
when the indoor unit solenoid valve is being controlled.
5.6.2
Guidelines when knocking out knockout
holes
NOTICE
Precautions when making knockout holes:
▪ Avoid damaging the casing.
▪ After making the knockout holes, we recommend you
remove the burrs and paint the edges and areas
around the edges using repair paint to prevent rusting.
▪ When passing electrical wiring through the knockout
holes, wrap the wiring with protective tape to prevent
damage.
a
b
a
Knockout hole
b
Burr
c
Sealant etc.
Installation and operation manual
18
a
voltage-free
contact
for
c
5.6.3
Guidelines when connecting the electrical
wiring
Tightening torques
Wiring
X1M: power supply wiring
(power supply + shielded
ground)
X2M: remote operation
switch, low-noise switch
and transmission output
X3M: output signals
5.6.4
To connect the electrical wiring on the
outdoor unit
NOTICE
▪ Follow the wiring diagram (delivered with the unit,
located at the inside of the service cover).
▪ Make sure the electrical wiring does NOT obstruct
proper reattachment of the service cover.
1 Remove the service cover.
2 Connect the remote operation switch as follows:
A
B
C
D
F1 F2
NOTICE
Remote operation switch. The unit is factory-equipped
with an operation switch with which you can turn unit
operation ON/OFF. If you want to remotely turn outdoor
unit operation ON/OFF, a remote operation switch is
required. Use a voltage-free contact for microcurrent
(≤1 mA, 12 V DC). Connect to X2M/C+D, and set to
"Remote ".
3 Connect the low-noise switch as follows:
A
B
C
D
F1 F2
NOTICE
Low-noise switch. If you want to remotely turn ON/OFF
low-noise operation (see setting [2‑18]), you must install a
low-noise
switch.
Use
microcurrent (≤1 mA, 12 V DC). Connect to X2M/A+B.
4 If you want to connect the modbus communication box,
connect the transmission wiring as follows:
A
B
C
D
F1 F2
5 Connect the wiring to the output signals terminal (X3M) as
follows:
Screw size
Tightening
torque (N•m)
M5
2.2~2.7
M3.5
0.8~0.97
M4
2.39~2.91
X2M
X2M
a
voltage-free
contact
for
X2M
LRMEQ3+4BY1
Air-cooled refrigeration condensing unit
4P495373-1 – 2017.07
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Troubleshooting
