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RXYSQ4~Y1B
VRVIII-S System air conditioner
4PW68122-1 – 02.2011
Installation manual
21
Setting the cool/heat operation
1
For VRV indoor units only:
Performing cool/heat setting with the remote controller
connected to the indoor unit.
Keep the cool/heat selector switch (DS1-1) on the outdoor unit
PC board at the factory setting position IN/D UNIT.
(See
figure 16)
.
2
For Sky Air or room air conditioner indoor units only:
Performing cool/heat setting with the cool/heat selector.
Connect the cool/heat selector remote controller (optional) to the
A/B/C terminals and set the cool/heat selector switch (DS1-1) on
the outdoor unit PC board to OUT/D UNIT.
(See figure 15)
.
■
The wiring from the BP units must be connected to the F1/F2
(In-Out) terminals on the PC board in the outdoor unit.
■
After installing the interconnecting wires inside the unit, wrap
them along with the on-site refrigerant pipes using finishing
tape, as shown in
figure 17
.
For the above wiring, always use vinyl cords with 0.75 to 1.25 mm
2
sheath or cables (2-core wires). (3-core wire cables are allowable for
the cooler/heater changeover remote controller only.)
11. B
EFORE
OPERATION
11.1. Service precautions
Caution when performing service to inverter equipment
■
Do not touch live parts for 10 minutes after the power supply is
turned off because of high voltage risk.
■
Additionally, measure the points as shown in the figure with a
tester and confirm that the voltage of the capacitor in the main
circuit is no more than 50 V DC.
■
Make sure that the power supply is turned off before performing
the maintenance work. The heater of the compressor may
operate even in stop mode.
■
Please note that some sections of the electric component box
are extremely hot.
■
In order to prevent damage to the PCB, first eliminate static
electricity by touching a metal part (e.g. stop valve) with your
hand. Then pull out the connector.
■
After measuring the residual voltage, pull out the outdoor fan
connector.
■
Make sure you do not touch a conductive section.
■
The outdoor fan may rotate due to strong backblow wind,
causing the capacitor to charge. This may result in an electric
shock.
After maintenance, make sure the outdoor fan connector is
connected again. Otherwise, the unit may break down.
1
Remote controller
1
Cool/heat selector
NOTE
When the cool/heat selector is set to heat, you
cannot select cooling with the remote controller.
For low-noise operation or demand operation, it is
necessary to get the optional 'External control adaptor for
outdoor unit' (DTA104A61/62).
For details, see the installation manual attached to the
adaptor.
■
For Sky Air or room air conditioner indoor units only:
Be sure to follow the limits below. If the unit-to-unit
cables are beyond these limits, it may result in
malfunction of transmission.
Maximum wiring length: 200 m
Total wiring length: 300 m
■
For VRV indoor units only:
Be sure to follow the limits below. If the unit-to-unit
cables are beyond these limits, it may result in
malfunction of transmission.
Maximum wiring length: 300 m
Total wiring length: 600 m
■
Up to 9 branches are possible for unit-to unit cabling.
For VRV indoor units only: No branching is allowed
after branching.
(See figure 18)
.
■
Never connect the power supply to unit-to-unit cabling
terminal block. Otherwise the entire system may
break down.
1
Liquid pipe
2
Gas pipe
3
Interconnecting wiring
4
Insulator
5
Finishing tape
1
Branch
2
Subbranching
WARNING: ELECTRIC SHOCK
Play it safe!
Touch a metal part by hand (such as the stop valve) in
order to eliminate static electricity and to protect the PCB
before performing service.
A2P
A1P
A1P
X2M
A4P
X106A X107A
V1
C+
C–
Y1