Full Closing Of Electronic Expansion Valves - Daikin E-Series Service Manual

BP Unit Control

6.2.3 Full Closing of Electronic Expansion Valves

Purpose of the The electronic expansion valves are initialized when the power is turned on.
Function
Details
The following processes are conducted.
1. Conducts P1 pulses close when power is turned on, and sets current opening to 0 pulse
2. Sends electronic expansion valve initialization signal to outdoor unit.
3. Closes the electronic expansion valve of each chamber (sets the electronic expansion valve
4. Stops transmission of electronic expansion valve initialization signal when EVH retightening
6.2.4 Control Based on EV Opening Command from Outdoor Unit
Purpose of the This function operates the electronic expansion valve based on EV opening command sent from
the outdoor unit.
Function
Outline
The electronic expansion valve operation based on EV opening command provides the
following functions.
1) Pressure equalization prior to startup
2) Startup control
3) Restart standby
4) Pump-down residual operation
5) Oil return operation
6) Defrost operation
82
(fully closing process).
pulse to 0).
is completed.
Power ON
EVA
EVB
EVC
EVH
P 1
0
P 1
0
P 1
0
P 1
0
SiENBE18-621
(M1047)
Function