Outdoor Unit Control; Electronic Expansion Valve (Eev) Control; 4-Way Valve Control In Heating; Electric Heater Control - Haier Super Match Series Service Manual

3.2 Outdoor unit control

3.2.1 Outdoor frequency control
A. Compressor running frequency range: 3U19:20-100RPS 3U24:20-94RPS, the others are 20~95RPS

3.2.2 Electronic expansion valve (EEV) control

A: Electronic characteristic
Max. open angle 500 pulse
Driving speed PPS
B: Standard open angle control
In Cool/Dry mode, standard open angle: outdoor ambient temp.≥20
o
temp.<20 C, 210 pulse(E);
In Heat mode, standard open angle: outdoor ambient temp.≥10
o
temp.<10 C, 210 pulse (E).
E. 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
o
100 C<discharging temp.
o
90 C< discharging temp.<=100
o
<=90 C
Heating mode
o
100 C<discharging temp.
o
90 C< discharging temp.<=100
o
<=90 C

3.2.3 4-way valve control in heating

Multi: 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

3.2.4 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 not go down greatly.
• Ambient temp. TA≤27degree, when compressor stops, the electric heater will be electrified.
• When TA≥32degree, or compressor running, the electric heater will be off.
Heater ON
Ambient temp. TA( ℃ )
Indoor modification angle
+50degree/30seconds, it will stop until up to the max. permitted
opening angle
o
C Keep the angle
-5degree/30seconds, and reduce to 0 degree gradually
Indoor modification angle
+50degree/30seconds, it will stop until up to the max. permitted
opening angle
o
C Keep the angle
-5degree/30seconds, and reduce to 0 degree gradually
15 S（E ）
OFF
Super Match
o
C, 250 pulse(E);Outdoor ambient
o
C, pulse (E);outdoor ambient
2 minutes and 55s
27 32
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