7
Function and Control
ELECTRONIC EXPANSION VALVE OPERATION — Electronic expansion valves of the indoor unit regulate the refrigerant
flow to control superheat during cooling operation and subcooling during heating operation.
Table 6 —List of 500P EEV Opening in Cooling Mode
Table 7 —List of 2000P EEV Opening in Cooling Mode
500P EEV Operation Driver
When the indoor unit receives the following signal:
• Signal to turn OFF
• Indoor unit error signal
• Indoor unit turns to fan mode
• Indoor unit turns to thermo-OFF
• Indoor unit shut down due to low temperature protection on the evaporator
The EEV’s control uses the following logic:
• If the outdoor unit shuts down without cooling capacity requirement:
The EEVs keep previous opening for three minutes.
Then EEVs conduct 300P opening (EEV whose opening is not equal to zero will close to 0P first, then open to 300P).
• If the cooling capacity requirement of the outdoor unit is not equal to 0, the EEVs keep the previous opening for 25 seconds
after the indoor unit turns off, then close to -16P to reset the opening and standby.
When the indoor unit receives the turn ON signal, the EEVs control uses the following logic:
CAPACITY INDEX INITIAL OPENING MINIMUM OPENING MAXIMUM OPENING
7~18 120 54 480
24 120 54 480
30 120 54 480
36 120 54 480
Larger than 48 120 54 480
CAPACITY INITIAL OPENING MINIMUM OPENING MAXIMUM OPENING
Less than 12 300 104 2000
15~18 200 104 2000
24 300 104 2000
30 400 104 2000
Larger than 36 400 104 2000
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