Operation Control Function By The Outdoor Control; Determination Of Comressor Speed (Frequency); Compressor Start Control - Mitsubishi Heavy Industries SRK100VNXPZSX Technical Manual

2.9.4

Operation control function by the outdoor control

Models FDC100-140VN, 100-140VS
(1) Determination of compressor speed (Frequency)
Required frequency
(a) Cooling/dehumidifying operation
Max. required
frequency
Min. required frequency
(b) Heating operation
Max. required
frequency
Min. required frequency
(c) If the indoor unit fan speed becomes "Me" or "Lo", Max required frequentcy goes down accordingly depending
on indoor unit model.
(d) Max. required frequency under high outdoor air temperature in cooling mode
Maximum required frequency is selected according to the outdoor air temperature (Tho-A).
Max. required
frequency
(e) Max. required frequency under outdoor air temperature in heating mode
Maximum required frequency is selected according to the outdoor air temperature (Tho-A).
Max. required
frequency
(f) Selection of max. required frequency by heat exchanger temperature
(i) Maximum required frequency is selected according to the outdoor unit heat exchanger temperature (Tho-R) during
cooling/dehumidifying or according to the indoor unit heat exchanger temperature (Th2) during heating mode.
(ii) When there are 3 indoor unit heat exchanger temperatures (Th2), whichever the highest applies,
Max. required
frequency
(g) When any of the controls from (a) to (f) above may duplicate, whichever the smallest value among duplicated
controls is taken as the maximum required frequency.
(h) During heating, it is operated with the maximum required frequency until the indoor unit heat exchanger
temperature becomes 40°C or higher.

(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, "
Model
Usual operation
Silent mode, outdoor temperature ≦15°C
Model
Usual operation
Silent mode
Model
Outdoor air temperature is
40°C or higher
Outdoor air temperature is
46°C or higher
Model
Outdoor air temperature is
18°C or higher
Model
Cooling/ Outdoor unit heat exchanger
dehumidifying temperature is 56°C or higher
Indoor unit heat exchanger
Heating
temperature is 56°C or higher
PREPARATION" is displayed for 3 seconds on the remote control.
179
-
FDC100 FDC125
90 105
60 80
20 20
FDC100 FDC125
90 105
60 80
20 20
FDC100 FDC125
75 90
75 75
FDC100 FDC125
60 80
FDC100 FDC125
90 100
90 100
-
'17 • PAC-T-257
Unit: rps
FDC140
105
85
20
Unit: rps
FDC140
110
85
20
Unit: rps
FDC140
96
75
Unit: rps
FDC140
85
Unit: rps
FDC140
100
100