York YHKJXH012BAM--FX Service Manual page 106

3.2 Outdoor frequency control
3.2.1 Compressor running frequency range: 30-91RPS.
3.3 Electronic expansion valve (EEV) control:
3.3.1 Electronic characteristic:
Max. open angle 500 Pulse
Driving speed PPS
3.3.2 Initialization of EEV
EEV driving speed: open direction: 32MS; close direction: 32MS
3.3.3 Open angle limit of EEV
Unit stop
Cool/dry 250（E）
heat 250（E）
3.3.4 6、Standard open angle control
In Cool/Dry mode, standard open angle: outdoor ambient temp.≥22℃, 260pulse (E)
In heat mode, standard open angle: outdoor ambient temp.≥6℃, 240pulses (E)
3.3.5 When discharging temp. Td is too high or too low, modify the EEV angle
mode Modification process
Cooling If TD>106 degree and -1 degree /2 minutes, open
angle keeps between 106-50 .
Cooling If TD<50 degree and +1 degree /2 minutes, open
angle keeps between 50-106.
Heating If TD>100 degree and -1 degree /2 minutes, open
angle keeps between 100-50 .
Heating If TD<50 degree and +1 degree /2 minutes, open
angle keeps between 50-100
3.4 4-way valve control in heating
50s later after compressor start up, the 4-way valve start to operate. When compressor stops
or unit is not in heating mode, the 4-way valve is closed after compressor stop for 2 minutes
and 55s.
compressor ON
OFF
4-way valve ON
OFF
3.5 Control of defrosting in heating
In heating mode, defrosting temp. sensor Te will check the frosting condition of outdoor heat
Adjustable
upper limit
480（E）
480（E）
Outdoor ambient temp.≤22℃, 210pulse (E)
Outdoor ambient temp. ≤6℃, 160pulse (E)
50 秒（E）
106
Max.
modification
-3
+3
-3
+3
2 minutes and 55s