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FDCA301~601 models
1) Heating
a) After the compressor starts, the temperature at the indoor heat exchanger temperature (ThI-R) is checked,
and when all the following conditions are met, the electronic expansion valve (EEV) is controlled to control
the high pressure rise.
1
The indoor heat exchanger temperature (ThI-R) is 60 (56)ºC or higher while the compressor is running.
2
The electronic expansion valve’s (EEV) opening angle is 470 pulses or lower.
b) This control ends when the indoor heat exchanger temperature (ThI-R) becomes 57 (54) ºC or lower.
Note (1) Values in ( ) show the setting when DIP switch SW 5-3 is ON. (It is normally OFF.)
2) Cooling
a) After the compressor starts, when all the following conditions are met, the electronic expansion valve
(EEV) is controlled to control the high pressure rise.
1
The outdoor heat exchanger temperature (Tho-R) is 58ºC or higher while the compressor is running.
2
The outdoor air temperature (Tho-A) is 41ºC or higher.
3
The outdoor fan motor runs continuously for 30 seconds or longer at the UHi tap.
4
The electronic expansion valve’s (EEV) opening angle is 470 pulses or lower.
b) This control ends when the temperature at the outdoor heat exchanger (Tho-R) becomes 53ºC or lower.
3) High pressure abnormal
a) Heating, cooling
1
If the high pressure switch (63H1) opens (4.15 MPa), the compressor stops (the outdoor unit’s fan
motor stops after running for 30 seconds longer). After a 3-minute delay, when the high pressure switch
(63H1) is restored to the closed state (3.15 MPa), the compressor restarts. If the same condition occurs
5 times within 60 minutes after the first detection, an abnormal stop is performed and an error message
(E40) is displayed.
b) Cooling
1
If the outdoor heat exchanger temperature (sensed by Tho-R) is 65ºC or higher 5 times within 60
minutes while the compressor is operating, or if that temperature is detected continuously for 60 min-
utes, an abnormal stop is performed.
2
If the outdoor heat exchanger temperature becomes 48ºC or lower, it becomes possible to reset the unit
using the remote control unit.
(vii) Heating low outdoor temperature protection control (FDCVA 151~251 models only)
If a temperature of –10ºC is sensed at the heat exchanger (sensed by Tho-R) continuously for 1 minute during opera-
tion, the upper limit of the compressor speed is changed to 100 rps.
OFF
-7
Heat exchanger temperature (˚C)
-10
ON
(h) Inverter protection control (FDCVA 151~251 models only)
1) Current cut control
This prevents overcurrent in the inverter unit. If the current exceeds the set value, the compressor is stopped. It restarts
automatically after 3 minutes, but if current cut operates 3 times in a period of 20 minutes, . an abnormal stop (E42) is
performed.
2) Power transistor temperature control
The power transistor’s temperature is detected from the time when the compressor starts operation. When the tempera-
ture at speeds that are higher than the set speed is 82ºC or higher, the compressor’s speed is controlled. If the power
transistor’s temperature drops to 77ºC or lower, protection control is cancelled.
3) Excessive voltage protection control
The converter’s voltage is detected, and if it exceeds approximately 340V, abnormal detection control is exercised. If the
same trouble occurs 3 times in 20 minutes after the compressor starts, or if it continues unchanged for 15 minutes, an
abnormal stop (E47) is performed.
(i)
Thermistor disconnection (discharge pipe, outdoor heat exchanger and outdoor temperature thermistor)
1) Outdoor heat exchanger temperature, outdoor air temperature thermistor
If the detected temperature is –30ºC or lower at the outdoor heat exchanger temperature thermistor and outdoor air
temperature thermistor continuously for 5 seconds during the interval from 2 minutes to 2 minutes 20 seconds after the
compressor goes ON, the compressor is stopped. After a 3-minute delay, the compressor is restarted, but in the case of the
151~251 models, if this condition is detected 3 times in a 40-minute period, or if it is detected again within a 60-minute
period in the case of the 301~601 models, an abnormal stop is performed.
Note (1) The temperature is not detected during defrosting or for 3 minutes after defrosting is ended.
