Mitsubishi Heavy Industries FDTC40ZHXV Technical Manual page 176

(c) Compressor soft start control
1) 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.
2) Compressor protection start III - model 71
[Control condition] At 30 minutes or more after turning the power supply breaker and the number of compressor starts is
[Control contents]
a) Low frequency operation control during cooling/dehumidifying
[Control condition] When the conditions of compressor protection start III are established and one of following
[Control contents]
b) Forced heating operation control
[Control condition] When the conditions of compressor protection start III are established and the following
[Control contents]
c) Low frequency operation control during heating
[Control condition] When the conditions of compressor protection start III are established and at 30 minutes
[Control contents]
3) Compressor protection start III, models 100 - 250
[Control condition] Number of compressor starts is only 1 counted after the power supply breaker ON.
[Control contents]
a) Low frequency operation control during cooling/dehumidifying
[Control condition] Upon establishing the conditions of compressor protection start III, the low frequency
[Control contents]
However, when the outdoor air temperature (Tho-A) is 35°C or higher during cooling/
dehumidifying or the indoor return air temperature (Th
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
Cooling/dehumidifying
71
Cooling/dehumidifying
100~140
Cooling/dehumidifying
200, 250
only 1 counted after the power supply breaker ON.
Operates by selecting one of following operation patterns a), b) and c) according to the operation
mode and the outdoor air temperature (Tho-A).
conditions and
cooling/dehumidifying.
When the cooling or dehumidifying operation mode is selected, 6 hours or more have
elapsed after turning the power supply breaker on.
When the cooling or dehumidifying operation mode is selected, the outdoor air temperature
(Tho-A) is 5°C or higher. (Less than 6 hours after the power supply breaker on)
Compressor runs at 20 rps for 10 minutes from starting.
conditions are satisfied, the forced heating operation control is performed.
When the cooling or dehumidifying operation mode is selected, the outdoor air temperature
(Tho-A) is 5°C or lower. (Less than 6 hours after turning the power supply breaker on)
Operates the compressor at 42 rps for 10 minutes forcibly in the heating mode.
Stops the compressor after the end of the control in
the cooling mode.
After the restart, it operates with the compressor's frequency at 20 rps for 10 minutes in the
cooling mode.
or more after turning the power supply breaker on, the low frequency operation control is
performed during heating.
For 10 minutes from the start of compressor, it runs at 42 rps. However, when the outdoor air
temperature (Tho-A) is 35°C or higher, it starts at 40 rps and changes to 42 rps 30 seconds
later.
Operates by selecting one of following start patterns according to the operation mode and the
outdoor air temperature (Tho-A).
operation control is performed during cooling/dehumidifying.
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.
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
100~140 Cooling/dehumidifying
200, 250 Cooling/dehumidifying
A rps
42
Heating 62
55
Heating 55
55
Heating 55
is satisfied, the low frequency operation control is performed during
Operation mode A rps
169
– –
-A) is 25°C or higher during heating, it
I
B rps C rps
42
62
55
55
55
55
above and restarts 3 minutes later in
B rps
55 55
55 30
40
40
30
30
30
30
C rps
30
30