9
2000P 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 of 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 1200P opening (EEVs whose opening is not equal to
zero will close to 0P first, and then open to 1200 P).
• 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, and then close to -40P to reset the opening and open to 224P (Standby).
When the indoor unit receives the turn ON signal, the EEVs controls use the following logic:
Fig. 16 —2000P EEV Operation Driver
Initial EEV opening
Is Pe 14.5psi?
Keep the EEV
open for five minutes
NO
YES
Pump down order
NO
EEV Superheated
degree control
EEV open to
1000P for three minutes
Is DSH 27F?
YES
NO
7~12K: EEV open to 1200P,
15~30K: EEV open to 1000P,
36~54K: EEV open to 800P.
NO
Is Pe 44psi?
YES
Is startup time
30 minutes?
Pe 17psi,
or Tdsh 45,
or Pc 464psi
Pe 36psi?
YES
NO
EEV Superheated
degree control until initial
EEV opening three minutes
YES
YES
NO
EEV -40P until close,
then open to 24P
YES
NO
EEV open to 1000P for one
minute, if Pe 14.5psi, the
next time EEV opening
+400P until 2000P
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