Mitsubishi KXZ Series - 8.4 Operation control function by the outdoor control

(1) Operation of major functional components under each operation mode
Operation mode
Functional components
Cooling/Dehumidifying Heating
Compressor
ON
Compressor
OFF
All stop by
remote control
Compressor
ON
Compressor
OFF
All stop by
remote control
Magnetic contactor for
compressor (52C1)
ON OFF ON OFF
Crankcase heater (CH1) ON/OFF*1 ON/OFF*1 ON ON/OFF*1 ON/OFF*1 ON
Compressor (CM1)
Cooling low
pressure control
Stop Stop
Heating high
pressure control
Stop Stop
Fan motor (FMo1)
Normal control Stop Stop Normal control Stop Stop
4-way valve (20S) OFF OFF OFF ON ON ONOFF*2
Electronic expansion
valve for sub-cooling coil
(EEVSC)
Normal control Fully closed Fully closed Fully closed Fully closed Fully closed
Electronic expansion
valve for heating (EEVH)
Fully open Fully open Fully open
Normal
control
Fully closed Fully closed
Notes (1) Above list shows the conditions at steady state under each operation mode.
(2) *1 According to discharge superheat
(3) *2 It turns OFF after retaining ON condition for a certain minutes
(2) Compressor control
Compressor rotation speed at cooling (dehumidifying) and heating operations are as follows.
Unit: rps
Item
Model
Cooling (Dehumidifying) operation Heating operation
FDC121KXZE1-W 40 - 77 20 - 110
FDC140KXZE1-W 40 - 100 20 - 110
FDC155KXZE1-W 40 - 106 20 - 110
(3) Outdoor fan control
(a) Control contents of fan tap and fan speed
Outdoor fan tap
Fan speed
Cooling Heating
FMo1 [min
-1
] FMo1 [min
-1
]
0th speed 0 0
1st speed 200 130
2nd speed 300 300
3rd speed 350 350
4th speed 500 500
5th speed 600 600
6th speed 740 740
7th speed 820 820
8th speed 870 870
9th speed – 950
(b) Fan control during cooling
During cooling and dehumidifying, fan speed is controlled in accordance with the high pressure (sensed by
PSH) and the outdoor air temperature (sensed by Tho-A).
(i) Initial fan speeds are as follows.
Initial outdoor fan speed at cooling
Model 15°C < Outdoor air temperature < 20°C 20°C ≦ Outdoor air temperature
All models 3rd speed 5th speed
Outdoor air temperature ≤ 15°C
1st speed
(ii) During normal operation, the speed is changed in accordance with the high pressure value.
(A) Normal control
ON/OFF ON/OFF
8.4
Operation control function by the outdoor control
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'20 • KX-T-373