Daikin RMXS-L Series Service Manual page 68

Branch Provider (BP) Unit Control
6.2.3 Full Closing of Electronic Expansion Valves
Outline
The electronic expansion valves are initialized when the power is turned on.
Detail
The following processes are conducted.
1. Conducts P1 pulses close when power is turned on, and sets current opening to 0 pulse (fully
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 (bypass
6.2.4 Control Based on EV Opening Command from Outdoor Unit
Outline
This function operates the electronic expansion valve based on EV opening command sent from
the outdoor unit.
Detail 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) Defrosting operation
59
closing process).
pulse to 0).
electronic expansion valve) retightening is completed.
Power ON
EVA
EVB
EVC
EVH
P 1
0
P 1
0
P 1
0
P 1
0
SiUS181305E
(M1047)
Function