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OUTDOOR TECHNICAL OVERVIEW
B-11
ENGLISH
Operations
Electronic Expansion Valve (EEV) Control
Electronic characteristics
Max. open angle 480 pulses
Driving speed PPS
Open angle limitation of EEV
Unit stop Max. open angle Thermostat OFF Min. open angle
Cool/ dry 5 pulses 480 pulses 5 pulses 80 pulses
Heat 5 pulses 480 pulses 50 pulses 80 pulses
The EEV routinely opens and closes to maintain the compressor discharge temperature within an acceptable range.
c
ompressor ON
OFF
4
-way valve ON
OFF
50S
2 minutes and 55s
4-Way Valve Heating Control
When the compressor starts in the heating mode, there is a 1-minute delay before power is applied to the 4-way valve to switch
the ow of hot refrigerant to the indoor coil. When the call for heat is satised and the compressor shuts o, a 3-minute delay will
occur before the 4-way valve is powered down and switches back to the at-rest (cooling) position.
If the 4-way valve does not switch into the heating mode, after 15 minutes of compressor run time and the indoor coil
temperature is below 41°F/5°C, the compressor will stop and the unit will display a 17-ash error code on the outdoor PCB.
Compressor Sump Heater
The sump (crankcase) heater keeps refrigerant at a higher temperature than the coldest part of the system. This prevents
refrigerant from mixing with the compressor oil and also dries condensed refrigerant inside the sump. The sump heater will be
energized when the ambient temperature is below 81°F/27°C and will be o when the ambient is 90°F/32°C.
Heater OFF Heater ON*min
Ta>50
O
F(10
O
C) OR Td>=68
O
F(20
O
C) 0 0
41
O
F(5
O
C<Ta ≤50
O
F(10
O
C)and Td<68
O
F(20
O
C) 50%*60min 50%*60min
32
O
F(0
O
C)<Ta ≤41
O
F(5
O
C)and Td<68
O
F(20
O
C) 33%*60min 66%*60min
32
O
F(0
O
C)>=Ta andTd<68
O
F(20
O
C) 0 100%*60min
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