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4. Before Operation
4. Before Operation
CAUTION
!
•
Supply electrical power to the system for approximately 12 hours before start-up after long shut down.
Do not start the system immediately after power supply, it may cause a compressor failure, because the
compressor is not heated well.
•
Make sure that the outdoor unit is not covered with snow or ice. If covered, remove it by using hot water
(approximately 50°C). If the water temperature is higher than 50°C, it will cause damage to plastic parts.
When the system is started after a shutdown longer than approximately 3 months it is recommended that
the system be checked by your service contractor.
Turn OFF the main switch when the system is stopped for a long period of time If the main switch is
not turned OFF, electricity is consumed, because the oil heater is always energized during compressor
stopping.
5. Operation Method
Refer the manual for PC-ARFG2-Z or PC-LH8QE.
6. Automatic Control
The system is equipped with the following functions.
NOTE
•
Except for a long period of shutdown, keep the main power switch ON. The drain discharge mechanism
is operated if the drain level is higher than the setting.
Three Minute Guard (Enforced Stoppage)
The compressor remains off for at least 3 minutes once it has stopped. If the system is started within
approximately 3 minutes after it has stopped, the RUN indicator is activated. However, the cooling
operation or the heating operation remains off and does not start until after 3 minutes has elapsed.
Three Minute Guard (Enforced Operation)
If all indoor units of the system are Thermo-OFF within approximately 3 minutes after compressor has
started, compressor is operated during 3 minutes continuously. However, if all indoor units of the system
are stopped by wired remote controller, compressor is stopped.
Frost Prevention During Cooling Operation
When the indoor unit is operated at low discharge air temperature, the cooling operation may be changed
to fan operation for a while to avoid frost formation on the indoor heat exchanger.
Hot Start During Heating Operation
To prevent cold air discharge in the room, the fan speed is controlled from the slow position and the low
position and then to the set position according to the discharge air temperature.
Slow Air Control During Defrosting Operation
When the outdoor unit is performing the automatic defrosting operation, the indoor fan is stopped.
Cooling of Indoor Unit
When the heating operation is stopped, the indoor fan operation is maintained at the slow position for the
maximum of 2 minutes to lower temperature of the inside unit.
Prevention of Overload Operation
When the indoor temperature is high during heating operation, compressor is stopped due to activation of
the indoor thermistor until the temperature becomes low.
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