Specifications

FDC-HKX
800
(i) Non-inverter compressor (CM2) overcurrent protection (Only for 224, 280 models)
If the T phase current at the secondary side of 52C2 is detected exceeding the setting value for approx. 0.5 second, the compressor
stops. The compressor is reset automatically after a 3-minute delay. If the error is detected at second time within 40 minutes after
the initial detection, the unit stops with the error stop.
(m) Compressor oil level protection
When operation has continued at less than 30 Hz for 9 minutes or more, and if operation at 35 Hz per minute continued for 30
minutes or more, CM1 is stopped forcibly for 3 minutes.
However, when the frequency is at less than 30 Hz the protective control has been actuated, its control dominates.
(n) Compressor (CM1) motor lock protection
If the current value exceeds the setting value for 0.5 seconds continuously during operation, the compressor stops. If the current
detected after a 3- minute delay is less than 2A, the compressor can be started again.
If the detection is repeated 5 times within 60 minutes after the initial detection or the condition that the current does not drop below
2A continues for 10 minutes after the first to fourth stops of compressor, the compressor stops with the error stop.
(p) Open phase protection (Only for 224, 280 models)
If the T phase current at the secondary side of 52C2 is detected to be less than 2A for 5 seconds continuously, the compressor stops
with the error stop.
(q) Antiphase protection and open T phase at 52C1 primary side
This function monitors the phase order on the primary side of 52C1 (whenever power is turned ON) and judges R→T→S→R as the
antiphase (monitors simultaneously also open phase of T phase at the primary side). If the antiphase continues for 2 seconds, the
compressor is stopped with the error stop.
(r) Compressor motor protection
If the T phase current drops below 0.5 A for 4 seconds continuously during CM1 ON (≥ 20 Hz), both CM1 and CM2 are stopped.
The operation enters the frequency reset mode after a delay of 3 minutes.
(s) Indoor unit connection number protection
If the number of indoor units on the connection exceeds the number as listed below, the compressor stops with the error stop.
(10) Value shift adjustment of room air temperature detection in heating
Under the standard specifications, the room temperature is adjusted at the setting temperature by controlling the indoor unit
capacity based on the setting temperature of thermostat and the suction air temperature.
However, where the unit is installed in the ceiling and warm air tends to stay around the ceiling, temperature in the living space may
not be adjusted at the setting temperature. In such occasion, it is recommended to change the setting of dip switch SW5-2, which is
found on the PCB of the indoor unit, to ON position so that the capacity control is tripped at +3˚C above the setting temperature of
thermostat and thus the heating feeling will improve.
Note (1) They are the numbers of units used for judgement of error for the purpose of control and not
equal to the numbers of units which can be connected.
Number of units on connection 10 units 16 units
model
Item
140 model 224, 280 model
High
Low
Heating
capacity
Heating
capacity
Standard
High
-1˚C +1˚C +2˚C +4˚C
Low
Heating
capacity
Heating
capacity
Thermostat setting temperature
Standard
High
Low
Heating
capacity
Heating
capacity
With SW5-2 "ON"
Thermostat setting temperature
Note (1) Refer to page 000 for position of SW