Mitsubishi Heavy Industries SRK100VNXWZRF Service Manual page 19

(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 source breaker, it may enter the standby state for maximum 30 minutes
(" PREPARATION" is displayed on the remote control) in order to prevent the oil loss in the compressor.
If the cooling/dehumidifying/heating operation is selected from the remote control when the outdoor unit is in the
standby state, "
PREPARATION" is displayed for 3 seconds on the remote control.
(3) Compressor soft start control
(a) Compressor protection start I
[Control condition] Normally, the compressor operation speed is raised in this start pattern.
[Control contents] (i) Starts with the target compressor speed 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 operation compressor speed control during cooling/dehumidifying
[Control condition]
[Control contents]
(ii) Low operation compressor speed control during heating
[Control condition]
[Control contents]
However, when the outdoor air temperature (Tho-A) is 35°C or higher and the outdoor air
temperature (Tho-A) is 10°C or higher during cooling/dehumidifying or the room air
temperature (Th1) is 25°C or higher and the outdoor air temperature (Tho-A) is 10°C or higher
during heating, it starts at C rps.
(ii) At 30 seconds after the start of compressor, its target compressor speed changes to B rps and
the compressor is operated for 2 - 4 minutes with its operation speed fixed at B rps.
Model Operation mode
Cooling/Dehumidifying
FDC100
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 operation
compressor speed control is performed during cooling/dehumidifying.
1) Starts with the target compressor speed 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 target compressor speed is changed to B
rps and the operation compressor speed is fixed for 10 minutes.
Model
FDC100 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 compressor speed at A rps. However, when the room
air temperature (Th1) is 25°C or higher, it starts at C rps.
2) At 30 seconds after the start of compressor, the compressor's target compressor speed is
changed to B rps and the operation compressor speed is fixed for 10 minutes.
Model
FDC100
-
A rps
35
Heating 35
A
Operation mode
A
Operation mode
35
Heating
18
-
'22 • PAC-SM-422
B rps C rps
35
35
B
rps rps
35 35
B
rps rps
35
25
25
C
rps
25
C
rps
25