Mitsubishi Heavy Industries SRK100VNXWZRF Service Manual page 188

(c) Relationship between compressor speed and outdoor fan speed.
Outdoor fan speed is controlled according to the operation mode (Heating/cooling) and the compressor speed.
Fan speed
Cooling
FDC
100
Heating
(d) Outdoor fan control at low outdoor air temperature
(i) Cooling
1) Operating conditions
When the outdoor air temperature (TH2) is 22ºC or lower continues for 30 seconds while the compressor
speed is other than 0 rps
2) Detail of operation
After the outdoor fan operates at A speed for 60 seconds; the corresponding outdoor heat exchanger tem-
perature shall implement the following controls.
● Value of A
15˚C < Outdoor air temperature
10˚C < Outdoor air temperature < = 15˚C
Outdoor air temperature < = 10˚C
Outdoor heat exchanger temperature = < 21ºC
a)
After the outdoor fan speed drops (down) to 1 speed for 60 seconds; if the outdoor heat exchanger tem-
perature is lower than 21ºC, gradually reduce the outdoor fan speed by 1 speed. (Lower limit 9th speed)
21ºC < Outdoor heat exchanger temperature = < 38ºC
b)
After the outdoor fan speed maintains for 20 seconds; if the outdoor heat exchanger temperature is
21ºC-38ºC, maintain outdoor fan speed again.
c) Outdoor heat exchanger tempeature > 38ºC
After the outdoor fan speed rises (up) to 1 speed for 60 seconds; if the outdoor heat exchanger temperature
is higher than 38ºC, gradually increase outdoor fan speed by 1 speed. (Upper limit 15th speed)
3) Reset conditions
When either of the following conditions is satisfied
a) The outdoor air temperature (TH2) is 25ºC or higher and fan speed is 15th speed or more.
b) The compressor speed is 0 rps.
4) Outdoor fan speed and fan motor speed
Fan speed
FDC100
(ii) Heating
1) Operating condition
When the outdoor air temperature (TH2) is 4ºC or lower continues for 30 seconds while the compressor
speed is other than 0 rps
2) Detail of operation
The outdoor fan is stepped up by 2 speed step at each 20 seconds. (Upper limit 8th speed)
3) Reset conditions
When either of the following conditions is satisfied
a) The outdoor air temperature (TH2) is 6ºC or higher.
b) The compressor speed is 0 rps.
(e) Outdoor fan control at overload
(i) Cooling
1) Operating condition
When the outdoor air temperature (TH2) is 41ºC or higher continues for 30 seconds while the compressor command
speed is other than 0 rps
2) Detail of operation
The outdoor fan is stepped up by 3 speed. (Upper limit 8th speed)
3) Reset conditions
When either of the following conditions is satisfied
a) The outdoor air temperature (TH2) is 40ºC or lower.
b) The compressor speed is 0 rps.
1st speed 2nd speed 3rd speed
– –
– –
9th speed 10th speed 11th speed 12th speed 13th speed 14th speed 15th speed
200 225 250
187
- -
4th speed 5th speed
0-30 30-46 46-64
0-30 30-46 46-70
Outdoor fan
15th speed
12th speed
10th speed
275 300
'22 • PAC-SM-422
Unit: rps
6th speed 7th speed 8th speed
64-70 70-75 75-
70-90 90- –
-1
Unit: min
400 500