York YHKMXH009BARX-FX, Service Manual, Page: 231 / 269

3.2 Outdoor unit control
3.2.1 Outdoor frequency control
A. Compressor running frequency range: unitary:
30-91RPS YJU3YH019BARXA-X:20-100RPS, the others are 20~95RPS
B. defination of high-efficiency operation and its frequency control
In order to meet the cooling request at a high ambient temperature and the heating request at low ambient
temperature, we set the high-efficiency operation.
Entering condition: cooling mode, Tao≥33
o
C( E), heating mode, Tao≤5
o
C( E)
3.2.2 Electronic expansion valve (EEV) control
A: Electronic characteristic
Max. open angle 500 pulse
Driving speed PPS
B: Initialization of EEV
EEV driving speed: open direction: 32MS; close direction: 32MS
C: Open angle limitation of EEV
Unitary Unit stop Adjustable upper limit
Cool/dry 250(E) 480(E)
heat 250(E) 480(E)
Unit stop Adjustable upper limit Thermostat ON Thermostat OFF
Adjustable lower
limitation
Cool/ dry 5(E) 450(E)
standard open
angle+tolerance
5(E) 80(E)
Heat 60(E) 450(E)
standard open
angle+tolerance
60(E) 80(E)
D: Standard open angle control
Unitary: In Cool/Dry mode, standard open angle: outdoor ambient temp.≥22
o
C, 260pulse (E);Outdoor ambient
temp.≤22
o
C, 210pulse (E);
In heat mode, standard open angle: outdoor ambient temp.≥6
o
C, 240pulses (E) ;Outdoor ambient
temp. ≤6
o
C, 160pulse (E)
Multi: In Cool/Dry mode, standard open angle: outdoor ambient temp.≥20
o
C, 250 pulse(E);Outdoor ambient
temp.<20
o
C, 210 pulse(E);
In Heat mode, standard open angle: outdoor ambient temp.≥10
o
C, pulse (E);outdoor ambient
temp.<10
o
C, 210 pulse (E).
F: When discharging temp. Td is too high or too low, modify the EEV angle Unitary
mode Modification process Max. modification
Cooling If TD>106 degree and -1 degree /2 minutes, open angle keeps between 106-50 . -3
Cooling If TD<50 degree and +1 degree /2 minutes, open angle keeps between 50-106. +3
Heating If TD>100 degree and -1 degree /2 minutes, open angle keeps between 100-50 . -3
Heating If TD<50 degree and +1 degree /2 minutes, open angle keeps between 50-100 +3
Multi: In order to cooperate the compressor discharging temp. over high protection, the system will enlarge
the EEV open angle. Within 5 minutes after compressor starts up, it will not modify. The detecting period is 30
seconds.
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