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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) on the
outdoor unit PC board (A1P) to OUT/D UNIT.
1
Cool/heat selector
For low-noise 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.
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
Maximum No. of branches: 9
Never connect the power supply to unit-to-unit cabling
terminal block. Otherwise the entire system may
break down.
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
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
sheath or cables (2 core wires). (3 core wire cables are allowable for
the cooler/heater changeover remote controller only.)
RMXS112~160D7V3B
Super Multi Plus System air conditioner
4PW19516-1B
(See figure
13).
14.
11. B
EFORE OPERATION
11.1. Service precautions
WARNING: ELECTRIC SHOCK
Caution
when
equipment
Do not touch live parts for 10 minutes after the power
supply is turned off because of high voltage risk.
Additionaly, 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.
1
1
A
B
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.
2
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.
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.
11.2. Checks before initial start-up
Make sure that the circuit breaker on the power supply
panel of the installation is switched off.
Attach the power wire securely.
Introducing power with a missing N-phase or with a
mistaken N-phase will break the equipment.
After the installation, check the following before switching on the
circuit breaker:
1
Transportation fittings
Be sure that the transportation fittings are removed from the
compressor.
2
The position of the switches that require an initial setting
Make sure that switches are set according to your application
needs before turning the power supply on.
performing
service
A3P
A2P
L1R
B
A
B
Fan connections of outdoor unit
Front view
View B
to
inverter
C+ C-
Installation manual
14
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