LREQ5~20B7Y1
Air cooled refrigeration condensing unit
4PW74302-1D – 2016.11
Installation manual
12
• If not factory installed, a main switch or other means for
disconnection, having a contact separation in all poles providing
full disconnection under overvoltage category III condition, shall be
installed in the fixed wiring.
• Electrical wiring must be done in accordance with the wiring
diagrams and the description herein.
• Do not operate until refrigerant piping work is completed.
(If operated before complete the piping work, the compressor may
be broken down.)
• Never remove thermistor, sensor or etc. when connecting power
wiring and transmission wiring.
(If operated with thermistor, sensor or etc. removed, the
compressor may be broken down.)
• This product have reversed phase protection detector that only
works when the power is turned on. If there exists black out or the
power goes on and off which the product is operating, attach a
reversed phase protection circuit. Running the product in reversed
phase may break the compressor and other parts.
• Attach the power wire securely. Introducing power with a missing
N-phase or with a mistaken N-phase will break the unit.
• Never connect the power supply in reversed phase.
The unit can not operate normally in reversed phase.
If you connect in reversed phase, replace two of the three phases.
• Make sure the electrical unbalance ratio is no greater than 2%. If it
is larger than this, the unit’s lifespan will be reduced.
If the ratio exceeds 4%, the unit will shut down and an malfunction
code will be displayed on the indoor remote controller.
• Connect the wire securely using designated wire and fix it with
attached clamp without applying external pressure on the terminal
parts (terminal for power wiring, terminal for transmission wiring
and earth terminal).
• Install a switch that allows you to switch OFF all poles from the
main power supply.
7-1 Example of wiring entire system
1
3 phase 50 Hz 380~415 V
Earth leakage circuit breaker (high-frequency type) (for earth
fault, overload, and short-circuit protection)
2
Outdoor units
3
Earth leakage circuit breaker (for earth fault, overload, and
short-circuit protection)
4
Remote switch (See Note 1.)
5
High-voltage AC 220~240 V (See Note 2.)
Warning output
Caution output
Operation output
Run output
6
Caution input
7
Warning input
8
Alarm panel
9
Control board (field supply)
10
Timer
11
Indoor unit
12
Indoor unit
13
Earth leakage circuit breaker
14
Earth leakage circuit breaker
15
Panel
16
Run input
17
Earth
18
OFF: Normal mode
ON : Low noise mode
Note
• Use conduit for power supply wiring.
• Make sure the weak electric wiring (i.e. for the remote controller,
between units, etc.) and the power wiring do not pass near each
other, keeping them at least 50 mm apart.
Proximity may cause electrical interference, malfunctions, and
breakage.
• Be sure to connect the power wiring to the power wiring terminal
block and secure it as described in
.
• Do not connect the power supply to the terminal block for the
transmission wiring for warning, alarm, operation output, and
remote operation switch. Otherwise the entire system will be
damaged.
• Transmission wiring should be secured as described
"7-3 Procedure for power supply wiring" on page 13
• Secure wiring with clamp such as insulation lock ties to avoid
contact with piping.
• Shape the wires to prevent the structure such as the control box lid
deforming. And close the cover firmly.
7-2 Procedure for incoming wiring
• Route high-voltage wiring (power supply wiring, earth wires, and
warning/alarm/operation wiring) through wiring openings located
on the side or front of the unit (knock holes) or on the bottom frame
(knock holes).
• Route low-voltage wiring (for remote operating switches) through
wiring openings (knock holes) located on the front of the unit or
through wiring intakes.
Note
• Open the knock holes with a hammer or the like.
• After knocking out the holes, we recommend you remove any burrs
and paint them using the repair paint to prevent rusting.
• When passing electrical wiring through the knock holes, protect the
wiring with a conduit or bushings, making sure not to damage the
wiring.
T1
Timer
Ry0, Ry1
Relay
K1M
Electromagnetic contactor (Defrosting heater)
E1H
Defrosting heater
S1T
Thermostat for inner temperature adjustment
S2T
Defrost completion thermostat
Y1S
Solenoid valve
H1P
Defrost lamp
1
17
15
16
13
11
14
12
4
18
3
9
10
5
2
8
6
7
Note: 1. In case of used remote switch, use non-voltage contact for
microcurrent (not more than 1mA, 12VDC).
Note: 2. Total capacity for caution, warning : 0.5A or less at AC 220 to 240V.
Capacity for operation output run output : 0.5A or less at AC 220 to 240V.
t°
K1M
Y1S
Ry0
X1M
L2
L1
L3 N
C
C1
X2M
W1
P1
P2
R
Y1S
RY0
RY1
K1M
RY0
2
1
X3M
Ry0
No
H1P
K1M
Ry0
t°
Ry0
T1
t°
S2T
A5P
T1
K1M
E1H
H1P
S1T
C
NC
B
S1T
X1M
A
Ry0
TeS1
S2T
Ry1
E1H
t°
Through-hole cover
Cut the shaded area
Electric wiring label
(Rear side of control
box lid)
Conduit
Piping outlet
High-voltage wiring
Low-voltage wiring
4PWEN74302-1D.book Page 12 Thursday, April 27, 2017 9:01 PM
