8 REMOTE CONTROLLER OPERATION
It is advisable to use PC-ART or PC-ARF remote controller (both optional). For more information about it installation and operation,
please refer to its corresponding Installation and Operation Manuals.
7
7 BEFORE OPERATION
CAUTION
• Supply electrical power to the system for approximately 12
hours before start-up or a long shutdown. Do not start the
system immediately after power supply, it may cause a com-
pressor failure because the compressor is not heated well.
• When the system is started after a shutdown longer that ap-
proximately 3 months, it is recommended to check the system
by your service contractor.
• Turn OFF the main switch when the system is to be stopped
for a long period of time: If the main switch is not turned OFF,
electricity will be used, because the oil heater is always ener-
gised during compressor stopping.
• 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 that 50°C, it will cau-
se damage to plastic parts.
9 AUTOMATIC CONTROLS
The system is equipped with the following functions.
Three minute guard
The compressor remains off for at least 3 minutes once it has stop-
ped. 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.
Operation may stop for 6 minutes maximum to protect compressor.
Frost prevention during cooling operation
When the system is operated in a low temperature room, the coo-
ling operation may be changed to fan operation for a while to
avoid frost formation on the indoor heat exchanger.
Automatic restart after power failure
If the power supply is interrupted for short periods of time (up to
2 seconds) the Remote Control switch will retain the settings and
the unit will restart when the power is restored.
If Automatic Restart is required after periods of lost power supply
in excess of 2 seconds please contact your distributor (optional
function).
Slow air control during heating operation
When the compressor is stopped while the thermostat is OFF, or
the system is performing the automatic defrosting operation, the
fan speed is set at the slow position.
Automatic defrosting cycle
When the heating operation is stopped by pressing RUN/STOP
switch, frosting on the outdoor unit is checked and the defrosting
operation may be performed for the maximum of 10 minutes.
Prevention of overload operation
When the outdoor temperature is too high during heating opera-
tion, heating operation is stopped due to activation of the outdoor
thermistor until the temperature becomes low.
Hot start during heating operation
To prevent cold air discharge, the fan speed is controlled from
the slow position to the set position according to the discharge air
temperature. At this time the lover is xes horizontally.
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