Determination Of Comressor Speed (Frequency); Compressor Start Control - Mitsubishi Heavy Industries V Multi FDC71VNX Technical Manual

( II ) Models FDC200, 250VSA
(1) Determination of compressor speed (Frequency)
Required frequency
(a) Cooling/dehumidifying operation.
Max. required
frequency
Min. required frequency
Note(1) Value in (
(b) Heating operation.
Max. required
frequency
Min. required frequency
Note(1) Value in (
(c) If the indoor fan speed becomes "Me" or "Lo", Max required frequency 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 heat exchanger temperature (Tho-R) during
cooling/dehumidifying or according to the indoor heat exchanger temperature (Thi-R) during heating mode.
(ii) When there are 3 indoor heat exchanger temperatures (Thi-R), 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 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
Outdoor air temperature ≦ 15°C or
indoor return air temperature ≦ 20°C
Silent mode
) are for the SW7-3 OFF.
Model
Usual operation
Silent mode
) are for the SW7-3 OFF.
Model
Outdoor air temperature is
40°C or higher
Model
Outdoor air temperature is
10°C or higher
Outdoor air temperature is
18°C or higher
Model
Cooling/ Outdoor heat exchanger
dehumidifying temperature is 56°C or higher
Indoor heat exchanger
Heating
temperature is 56°C or higher
PREPARATION" is displayed for 3 seconds on the remote control.
Unit: rps
FDC200 FDC250
120 120
100 100
80 (100) 70 (100)
15 20
Unit: rps
FDC200 FDC250
120 120
80 (100) 70 (100)
15 20
Unit: rps
FDC200 FDC250
100 120
Unit: rps
FDC200 FDC250
120 120
100 120
Unit: rps
FDC200 FDC250
110 120
120 120
335
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'19 • PAC-T-327