Compressor Start Control; Low Frequency Operation Control During Cooling/Dehumidifying - Mitsubishi Electric FDF71VNXVD Technical Manual

(2) Compressor start control
(a) Compressor starts upon receipt of the thermostat ON signal from the indoor unit.
(b) However, at initial start after turning the power supply breaker, it may enter the standby state for maximum 30 minutes
(" PREPARATION" is displayed on the remote controller) in order to prevent the oil loss in the compressor.
If the cooling/dehumidifying/heating operation is selected from the remote controller when the outdoor unit is in the
standby state, " PREPARATION" is displayed for 3 seconds on the remote controller.
(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] 1) 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 supply breaker ON.
[Control contents] O perates by selecting one of following start patterns according to the operation mode and the
1) Low frequency operation control during cooling/dehumidifying
[Control condition] U pon establishing the conditions of compressor protection start III, the low frequency
[Control contents] a) S tarts with the compressor's target frequency at A rps. When the outdoor air temperature
2) Low frequency operation control during heating
[Control condition] W hen the conditions of compressor protection start III are established and one of following conditions
[Control contents] a) S tarts the compressor with its target frequency at A rps. However, when the indoor unit
H owever, when the ambient air temperature (Tho-A) is 35°C or higher during cooling/
dehumidifying or the indoor return air temperature (Th
starts at C rps.
2) A t 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
71
Cooling/Dehumidifying
100, 125, 140
outdoor air temperature (Tho-A).
operation control is performed during cooling/dehumidifying.
(Tho-A) is 35°C or higher, it starts at C rps.
b) A t 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
71 Cooling/Dehumidifying
100,
125, 140 Cooling/Dehumidifying
a) and b) is satisfied, the low number of revolutions operation control is performed during heating.
a) At 30 minutes or more after turning the power supply breaker on
b) C ompressor underneath temperature (Tho-H) is 4°C or higher and the difference from the
outdoor air temperature (Tho-A) becomes 4°C or higher. [model 200, 250 only]
return air temperature (Th
b) A t 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
71
100,
125, 140
A rps
42
Heating 62
45
Heating 45
A
Operation mode
-A) is 25°C or higher, it start at C rps.
I
A
Operation mode
42
Heating
45
Heating
111
- -
'11 • PAC-T-160
-A) is 25°C or higher during heating, it
I
B rps C rps
42
62
45
45
B
rps rps
42 42
45 45
B
rps rps
42
45
40
40
25
25
C
rps
40
25
C
rps
40
25