Operation Control Function By The Outdoor Controller - Mitsubishi Electric FDT125VNVF Technical Manual

1.11.4 Operation control function by the outdoor controller

(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
1) 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 (Th
2) When there are 3 indoor unit heat exchanger temperatures (Th
Max. required
frequency
Note (1) Value in ( ) are for the 3 phase models.
(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 supply breaker, it may enter the standby state for maximum 30 minutes
(" PREPARATION" is displayed on the remote controller) in order to prevent the oil loss in the compressor.
If the cooling/dehumidifying/heating operation is selected from the remote controller 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 controller.
100 125
90 105
60 80
20 20
100 125
90 105
60 80
20 20
100 125
75 90
75 75
100 125
60 80
-R), whichever the highest applies,
I
100 125
90 100
90 100
317
- -
'12 • PAC-T-174
Unit: rps
140 200 250
105 100 120
85 70 80
20 30 30
Unit: rps
140 200 250
110 100 120
85 70 80
20 30 30
Unit: rps
140 200 250
96 75 98
75 66 66
Unit: rps
140 200 250
85 70 80
-R) during heating mode.
I
Unit: rps
140 200 250
100 100 120
100 100 120