Compressor Soft Start Control; Outdoor Unit Fan Control - Mitsubishi Heavy Industries SRK100VNXPZSX Technical Manual

(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] Upon establishing the conditions of compressor protection start III, the low frequency
[Control contents]
(ii) Low frequency operation control during heating
[Control condition] When the conditions of compressor protection start III are established and one of following conditions
[Control contents]
(4)

Outdoor unit fan control

(a) Outdoor unit fan tap and fan motor speed
Model
FDC100-140
Note (1) Value in ( ) are for the model FDC125, 140.
(b) Fan tap control during Cooling/Defumidifying operation
Fan taps are selected depending on the outdoor unit heat exchanger temperature (Tho-R1, R2) and the outdoor air temperature (Tho-A).
Note (1) It is detected by Tho-R1 or R2, whichever the higher.
zone Tap 5
zone Tap 5
zone Tap 4
zone Tap 3
zone
zone
15 18
However, when the ambient air temperature (Tho-A) is 35°C or higher during cooling/
dehumidifying or the indoor return air temperature (Th1) 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
Cooling/Dehumidifying
FDC100-140
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.
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
FDC100-140
➀ is satisfied, the low number of revolutions operation control is performed during heating.
➀ At 30 minutes or more after turning the power source breaker on
➀ Starts the compressor with its target frequency at A rps. However, when the indoor unit
return air temperature (Th1) 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
FDC100-140
Mode
Cooling/Dehumidifying
Heating
zone zone zone
Tap 5 Tap 5
Tap 5 Tap 4
(1)
Tap 4 Tap 3
(1)
Tap 3 Tap 2
zone
zone
46 48
30 37
Outdoor air temp. (˚C)
Operation mode A rps
Heating
Operation mode
Cooling/Dehumidifying
Operation mode
Heating
➀ speed ➁ speed ➂ speed ➃ speed ➄ speed ➅ speed ➆ speed
200 350 600
200 350 600
Note (1) If the "silent mode start" signal is received from the remote control,
zone
the speed changes from Tap 4 to Tap 3.
Tap 4
Tap 3
Tap 2
Tap 1
zone
zone
20 30
Outdoor unit heat exchanger temp. (˚C)
180
- -
'17 • PAC-T-257
B rps
55 55
55 55
A rps B rps
55 55
A rps B rps
55 55
Fan motor tap
740 820 870
740 820 870
zone
zone
43 53
33 40
C rps
30
30
C rps
30
C rps
30
Unit: min -1
910 (950)
(1)
910 (950)
(1)