5 Installation
Installation and operation manual
19
4BY1
Air-cooled refrigeration condensing unit
4P495373-1 – 2017.07
C1
C
W1 R P1 P2
a
b
c
d
a
Caution signal
b
Warning signal
c
Run signal
d
Operation signal
▪ Respect the following guidelines:
Output signal
Guideline
Caution
and
Warning
signal
Connection recommended
when system malfunctions
are likely to occur.
Run
signal
Connection optional.
Operation
signal
Connection mandatory.
Connect the operation signal
to the solenoid valves that are
installed upstream of the
expansion valves of the
indoor unit. The outdoor unit
controls the solenoid valve
opening:
▪ During start-up, to prevent
liquid
refrigerant
from
entering the compressor.
▪ During oil return operation.
See
"5.6.1 Field wiring:
Overview" on page 17
for
more details.
CAUTION
When connecting the power supply, the earth connection
must be made before the current-carrying connections are
established. When disconnecting the power supply, the
current-carrying connections must be separated before the
earth connection is. The length of the conductors between
the power supply stress relief and the terminal block itself
must be as such that the current-carrying wires are
tautened before the earth wire is in case the power supply
is pulled loose from the stress relief.
NOTICE
Never connect the power supply to terminal blocks X2M or
X3M. Otherwise the entire system may break down.
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.
6
Connect the
power supply
as follows:
3N~ 50 Hz
380-415 V
L1 L2 L3
L1 L2 L3
N
X1M
a
b
c
a
Earth leakage circuit breaker
b
Fuse
c
Power supply cable
NOTICE
Keep cables away from the left maintenance stop valve
and piping. The valve and piping can get very hot and
damage the cables.
7
Fix the cables with cable ties.
X1M
X3M
X2M
a
b
c
1×
2×
2×
a
Power supply (including earth)
b
Output signals
c
Remote operation switch, low-noise switch, transmission
8
Route the wiring through the frame and connect it to it.
Routing through
the frame
a
b
a
b
2
1
a
Power supply cable and output signal
cables
b
Remote operation switch cable, low-
noise switch cable, and transmission cable
Summary of Contents for LRMEQ3BY1
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