Mitsubishi Heavy Industries V Multi FDC71VNX Technical Manual page 125

(3) Compressor soft start control
(a) Compressor protection start I
[Control condition] Normally, the compressor operation frequency is raised in this start pattern.
[Control contents] (i) Starts with the compressor's target frequency at A rps.
(b) Compressor protection start III
[Control condition] Number of compressor starts is only 1 counted after the power source breaker ON.
[Control contents]
(i) Low frequency operation control during cooling/dehumidifying
[Control condition]
[Control contents]
(ii) Low frequency operation control during heating
[Control condition]
[Control contents]
However, when the outdoor air temperature (Tho-A) is 35°C or higher during cooling/
dehumidifying or the indoor return air temperature (Thi-A) is 25°C or higher during heating, it
starts at C rps.
(ii) At 30 seconds after the start of compressor, its target frequency changes to B rps and the
compressor is operated for 2 - 4 minutes with its operation frequency fixed at B rps.
Model Operation mode
Cooling/Dehumidifying
FDC71
Cooling/Dehumidifying
FDC100
Cooling/Dehumidifying
FDC125, 140
Operates by selecting one of following start patterns according to the operation mode and the
outdoor air temperature (Tho-A).
Upon establishing the conditions of compressor protection start III, the low frequency
operation control is performed during cooling/dehumidifying.
1) Starts with the compressor's target frequency at A rps. When the outdoor air temperature
(Tho-A) is 35°C or higher, it starts at C rps.
2) At 30 seconds after the compressor start, the compressor's target frequency is changed to B
rps and the compressor's operation frequency is fixed for 10 minutes.
Model
FDC71 Cooling/Dehumidifying
FDC100 Cooling/Dehumidifying
FDC125, 140 Cooling/Dehumidifying
When the conditions of compressor protection start III are established and one of following
conditions 1) is satisfied, the low number of revolutions operation control is performed during
heating.
1) At 30 minutes or more after turning the power source breaker on.
1) Starts the compressor with its target frequency at A rps. However, when the indoor
return air temperature (Thi-A) is 25°C or higher, it start at C rps.
2) At 30 seconds after the start of compressor, the compressor's target frequency is changed to
B rps and the compressor's operation frequency is fixed for 10 minutes.
Model
FDC71
FDC100
FDC125, 140
A rps
42
Heating 62
45
Heating 45
45
Heating 45
A
Operation mode
A
Operation mode
Heating
Heating
Heating
124
- -
'19 • PAC-T-327
B rps C rps
42
62
45
45
45
45
B
rps rps
42 42
45 45
45 45
B
rps rps
42 42
45 45
45 45
40
40
25
25
25
25
C
rps
40
25
25
C
rps
40
25
25