RXYSQ6P8Y1B9
VRVIII-S System air conditioner
4P357505-1 – 2013.08
Installation manual
17
Setting the cool/heat operation
1
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 13).
1
Remote controller
After installing the interconnecting wires inside the unit, wrap
them along with the on-site refrigerant pipes using finishing tape,
as shown in figure 14.
1
Liquid pipe
2
Gas pipe
3
Interconnecting wiring
4
Insulator
5
Finishing tape
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.)
12. Before operation
12.1. Service precautions
12.2.
Checks before initial start-up
NOTICE
When the cool/heat selector is set to heat, you cannot
select cooling with the remote controller.
NOTICE
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.
CAUTION
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.
No branching is allowed after branching. (See
figure 15).
1
Branch
2
Subbranching
Never connect the power supply to unit-to-unit cabling
terminal block. Otherwise the entire system may
break down.
WARNING
All wiring must be performed by an authorized
electrician.
All components procured on the site and all electric
construction shall comply with the applicable
legislation.
DANGER: HIGH VOLTAGE
To avoid electrical shock, make sure to disconnect the
power supply 1 minute or more before servicing the
electrical parts. Even after 1 minute, always measure the
voltage at the terminals of main circuit capacitors or
electrical parts and, before touching, make sure that those
voltages are 50 V DC or less.
NOTICE
To persons in charge of electrical wiring work:
Do not operate the unit until the refrigerant piping is
complete. (Running it before the piping is ready will break
the compressor.)
WARNING: ELECRTRIC SHOCK
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.
WARNING
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.
NOTICE
Note that during the first running period of the unit,
required power input may be higher than stated on the
nameplate of the unit. This phenomenon originates from
the compressor that needs elapse of a 50 hours run in
period before reaching smooth operation and stable power
consumption.
C+
C–
Y1
4P357505-1.book Page 17 Tuesday, September 10, 2013 7:59 AM
