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• Use a T-joint for the gas refrigerant branch and connect from the
top of the main piping.
T-joint
Main piping
T-joint
Branch piping
Make the piping
slant downward
• Make sure that the horizontal portion of the gas piping slants
downward to the outdoor unit (see the illustration above).
• If the outdoor unit is located above, make a trap on the gas pipe at
5 m intervals from outdoor unit. This will ensure the smooth
returning of oil in the piping slanting upward.
Gas piping
• Make sure that the horizontal run of the gas piping slants
downward to the outdoor unit.
• In order to prevent oil retention, do not make a trap in the horizontal
run of the gas piping.
7.
FIELD WIRING
To electric engineering contractors
• Be sure to install an earth leakage breaker. The product
incorporates inverter equipment. In order to prevent the
malfunctioning of the earth leakage breaker, make sure that the
earth leakage breaker withstands harmonic interference.
• Do not operate the condensing unit until refrigerant piping work is
completed, or otherwise the compressor will malfunction.
• Do not remove any electrical components such as thermistors or
sensors when connecting power supply wires or transmission
wires. The compressor may malfunction if the condensing unit is
operated with such electrical components removed.
CAUTION
• All field wiring and components must be installed by a licensed
electrician and must comply with relevant local and national
regulations.
• Be sure to use a dedicated power circuit. Never use a power supply
shared by another appliance.
• Never install a phase advancing capacitor. As this unit is equipped
with an inverter, installing a phase advancing capacitor will not only
deteriorate power factor improvement effect, but also may cause
capacitor abnormal heating accident due to high-frequency waves.
• Only proceed with wiring work after blocking off all power.
• Always ground wires in accordance with relevant local and national
regulations.
• This machine includes an inverter device. Connect earth and leave
charge to eliminate the impact on other devices by reducing noise
generated from the inverter device and to prevent leaked current
from being charged in the outer hull of the product.
• Do not connect the ground wire to gas pipes, sewage pipes,
lightning rods, or telephone ground wires.
Gas pipes: can explode or catch fire if there is a gas leak.
Sewage pipes: no grounding effect is possible if hard plastic
piping is used.
Telephone ground wires and lightning rods: dangerous when
struck by lightning due to abnormal rise in electrical potential in the
grounding.
Installation manual
13
Indoor unit side
Branch piping
Make the piping
slant downward
Main piping
Make the piping
slant downward
Outdoor unit side
• Be sure to install an earth leakage circuit breaker.
This unit uses an inverter, so install the earth leakage circuit
breaker that be capable of handling high harmonics in order to
prevent malfunctioning of the earth leakage circuit breaker itself.
• Earth leakage circuit breaker which are especially for protecting
ground-faults should be used in conjunction with main switch or
fuse for use with 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
Ry1
Relay
S1T
Thermostat for inner temperature adjustment
Y1S
Solenoid valve
2
7
C
C1
W1
R
5
6
8
X1M
L1
L2
L3
N
9
1
11
10
Note: 1. In case of used remote switch, use dry 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.
1 3 phase 50 Hz 380~415 V
Earth leakage circuit breaker (high-frequency type) (for earth
fault, overload, and short-circuit protection)
2 Master units
3 Slave unit
12
Ry1
Ry1
3
P1
P2
X1M(A1P)
13
Q1
Q2
X1M(A5P)
X1M
A
B
C
L1
L2
L3
N
X3M
1
2
4
LREQ15+20B7Y1R
Air cooled refrigeration condensing unit
4P360438-1B – 2014.01
S1T
Y1S
X1M(A1P)
Q1
Q2
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