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(iii) Discharge pipe temperature control (Models FDCA301~601 only)
If the discharge pipe temperature (sensed by Tho-D) exceeds the set value, the expansion valve opening angle is
controlled to prevent the discharge pipe temperature from rising. If it continues to rise anyway, the compressor is
stopped.
2) After the compressor stops the first time, if 60 seconds pass with the detected current not dropping to 1.5~2 A or
lower for 60 minutes, An abnormal stop is performed after the first time.
⽧Models FDCA801, 1001 only
1) If an overcurrent of 20A or greater is detected 5 times in 60 minutes after the compressor goes ON, or if an
overcurrent of 20A or greater is detected continuously for 60 minutes while the compressor is stopped, an abnormal
stop (E33) occurs.
2) If the overcurrent is detected to be 1.5 ~ 2A, operation recovers automatically.
(ii) Reverse phase and out of phase detection
1) Reverse phase protection
The phase sequence in the 52C secondary side is detected, and in cases other than those shown below, reverse phase
is judged and the unit is subjected to an abnormal stop (E32).
2) Out of phase detection (Detected by the T-phase)
If a current of 1.5 ~ 2A or lower is detected continuously for 4 seconds during compressor operation, the compres-
sor is stopped. If it is detected again within 60 minutes after it is detected the first time, and if it is detected while the
compressor is ON within 10 minutes after the power is turned ON (FDCA801, 1001 only), an abnormal stop (E34)
occurs.
Terminal block display
Wire connections
L1 · L2 · L3 · N
L1 · L2 · L3 · N
L3 · L1 · L2 · N
L2 · L3 · L1 · N
Retention
Expansion valve control
Release
Discharge pipe temperature (˚C)
90 100
2) Abnormal discharge pipe temperature
a) If the discharge pipe temperature rises to 121ºC or higher, the compressor is stopped [the outdoor unit’s fan
motor stops 30 seconds later. If the temperature drops to 80ºC or lower, the compressor recovers automatically.
b) If the abnormal discharge pipe temperature occurs 5 times in 60 minutes, or continues at 121ºC or higher for 60
minutes, including when the compressor is stopped, the unit performs an abnormal stop (E36).
Note (1) If the abnormal discharge pipe temperature continues for 45 minutes from the time it first occurs and does not drop below 80ºC,
the compressor cannot be operated again.. (It can be reset using the remote control unit.)
(iv) Abnormal discharge pipe temperature (Models FDCA801, 1001)
1) If the discharge pipe temperature rises to 135ºC or higher, the compressor stops. If the temperature drops to 90ºC or
lower, the compressor recovers automatically.
2) If the discharge pipe temperature is abnormal 5 times within 60 minutes, including when the compressor is stopped,
or is 135ºC or higher continuously for 60 minutes, then unit undergoes an abnormal stop (E36).
Retention
Compressor stops
Compressor operates
80 121
Discharge pipe temperature (˚C)
1) Compressor speed (Expansion valve) control
90 135
Compressor stop
Compressor operation
Discharge pipe temperature (˚C)
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