Mitsubishi Electric SRK100VNPZJX, Technical Manual

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318
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(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] a) Starts with the compressor’s target frequency at
A
rps.
However, when the ambient air temperature (Tho-A) is 35°C or higher during cooling/
dehumidifying or the indoor return air temperature (Th
I
-A) is 25°C or higher during heating, it
starts at
C
rps.
b) 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 A rps B rps C rps
100-140
Cooling/Dehumidifying 55 55 30
Heating 55 55 30
200, 250
Cooling/Dehumidifying 55 55 30
Heating 55 55 30
(b) Compressor protection start III
[Control condition] Number of compressor starts is only 1 counted after the power supply breaker ON.
[Control contents] Operates by selecting one of following start patterns according to the operation mode and the
outdoor air temperature (Tho-A).
1) Low frequency operation control during cooling/dehumidifying
[Control condition] Upon establishing the conditions of compressor protection start III, the low frequency
operation control is performed during cooling/dehumidifying.
[Control contents]
➀
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.
➁
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 Operation mode A rps B rps C rps
100-140 Cooling/Dehumidifying 55 55 30
200, 250 Cooling/Dehumidifying 55 30 30
2) Low frequency operation control during heating
[Control condition] When the conditions of compressor protection start III are established and one of following conditions
➀
and
➁
is satisfied, the low number of revolutions operation control is performed during heating.
➀
At 30 minutes or more after turning the power supply breaker on
➁
Compressor 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]
[Control contents]
➀
Starts the compressor with its target frequency at
A
rps. However, when the indoor unit
return air temperature (Th
I
-A) is 25°C or higher, it start at
C
rps.
➁
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 Operation mode A rps B rps C rps
100-140 Heating
55 55 30
200, 250 Heating
55 30 30