3.3.2 Initialization of EEV
EEV driving speed: open direction: 32MS; close direction: 32MS
3.3.3 Open angle limitation of EEV
Unit
stop
Adjustable
upper
limitation
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
）
3.3.4 Standard open angle control
In Cool/Dry mode, standard open angle: outdoor ambient temp.
≥
20
℃
, 250 pulse(E);
Outdoor ambient temp.
＜
20
℃
, 210 pulse(E);
In Heat mode, standard open angle: outdoor ambient temp.
≥
10
℃
, pulse (E);
outdoor ambient temp.
＜
10
℃
, 210 pulse (E).
3.3.5 When discharging temp. Td is too high, modify the EEV angle.
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.
Cooling mode
Indoor modification angle
100
℃
<
discharging temp.
+50degree/30seconds, it will stop until up to the max. permitted
opening angle
90
℃
<
discharging temp.
<
=100
℃
Keep the angle
<
=90
℃
-5degree/30seconds, and reduce to 0 degree gradually
Heating mode
Indoor modification angle
100
℃
<
discharging temp.
+50degree/30seconds, it will stop until up to the max. permitted
opening angle
90
℃
<
discharging temp.
<
=100
℃
Keep the angle
<
=90
℃
-5degree/30seconds, and reduce to 0 degree gradually
3.4 4-way valve control in heating
Protection when 4-way valve can not reverse in heating:
10 minutes later after compressor startup, if indoor coil average temp. is below 15degree and keeps for 1
minute, the unit will stop and occur the 4-way valve protection.
compressor ON
OFF
4-way valve ON
OFF
15s
（
E
）
2minutes and 55s
3.5 Electric heater control
If compressor has not run for a long time, the refrigerant will deposit on the bottom of compressor and mix
with the refrigeranr oil. When re-startup, because low pressure reduces, refrigerant will be segregated
from the refrigerant oil and cause soam in the oil, which will make compressor exhaust a lot of oil.
Therefore please stop heating the compressor bottom to ensure the low pressure in startup period should
-80-
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