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(f) Detection of disconnected wires in temperature thermistors (outdoor heat exchanger, outside air tem-
perature, discharge pipe, suction pipe, under-dome) and low pressure sensor.
1) Outdoor heat exchanger temperature thermistor, outside air temperature thermistor and low pressure
sensor
If the following conditions are detected continuously for 5 seconds between 2 minutes and 2 minutes 20 seconds after the
compressor goes ON, the compressor stops. After a 3-minute delay, the compressor is restarted, but if the same condition
is detected 3 times within 60 minutes (within 40 min.), an abnormal stop occurs.
Note (1) For 3 minutes after dehumidifying and defrosting are finished (2 min ~ 2 min. 20 seconds), there is no detection.
• Outdoor heat exchanger temperature thermistor: -30 (-50) ˚C or lower.
• Outside air temperature thermistor: -30˚C or lower
• Low pressure sensor thermistor: 0V or lower, or 3.49 V or higher (FDCA801, 1001 only)
Note (1) Values in ( ) show in the case of the FDCA801, 1001 models.
2) Discharge pipe temperature thermistor, suction pipe temperature thermistor, under-dome tempera-
ture thermistor
If the following conditions are detected continuously for 5 seconds between 10 minutes and 10 minutes 20 seconds after
the compressor goes ON, the compressor stops. After a 3-minute delay, the compressor is restarted, but if the same
condition is detected 3 times within 60 minutes (within 40 min.), an abnormal stop occurs.
Note (1) For 3 minutes after dehumidifying and defrosting are finished, there is no detection.
• Discharge pipe temperature thermistor: -10˚C or lower
• Suction pipe temperature thermistor: -50˚C or lower (FDCA801, 1001 only)
• Under-dome temperature thermistor: -50˚C or lower (FDCA801, 1001 only)
Note (1) Values in ( ) show in the case of the FDCA801, 1001 models.
(g) Insufficient refrigirant protection control
1) 3 minutes after the compressor starts in the case of cooling and dehumidification, and 4 minutes after in the case of
heating, the indoor heat exchanger temperature (sensed by Thi-R) and indoor return air temperature (sensed by Thi-A)
are detected and at the point when all the following conditions are satisfied, stop control is performed.
a) When the following conditions are detected continuously for 5 minutes or longer.
• During cooling and dehumidification: The indoor heat exchanger temperature (Thi-R) is 4 degrees higher than the
indoor return air temperature (Thi-A).
• During heating: The indoor heat exchanger temperature (Thi-R) is 6 degrees lower than the indoor return air
temperature (Thi-A).
b) If the controls in item a) are implemented 3 times within 30 minutes, an abnormal stop is performed and an error
message is displayed (E57).
2) If the compressor is starting for the first time after the power is turned ON, and abnormal stop is performed the first time
and an error message (E57) is displayed.
Note (1) A defrost operation or pump down control are excluded.
(h) Low voltage protection control
If a power supply voltage of 176 V or lower is detected while the compressor is stopped, or if a power supply voltage of 176
V or lower is detected for 3 minutes during compressor operation, the compressor is stopped.
(i) Oil return solenoid valve (SV6) control (Models FDCA801, 1001 only)
During compressor operation, signals from the under-dome temperature sensor are sent to the oil return solenoid valve (SV6)
to control the dilution rate inside the compressor.
(o) Test operation
1) It is possible to operate the outdoor unit using SW2 (SW3) and SW5-4 (SW3-4) on the outdoor unit PCB.
Note (1) Items in ( ) show in the case of FDCA801, 1001 models.
SW5-4
(SW3-4)
SW2
(SW3)
OFF
ON
Cooling test operation
Heating test operation
After pressing
continuously
for 1 second
Test operation is ended by pressing SW2 (SW3) during test operation.
Note (1) The under-dome superheat rate is the
under-dome sensor value. It is a value
determined by the intake pressure
saturation temperature.
SV6:ON
SV6:OFF
25 20
Under-dome superheat rate
(1)
(deg)
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