Daikin EWYQ230DAYN [395/524] Way valve

Daikin EWAQ240DAYN [395/524] Way valve
ESIE06-05 Functional Control for a Standalone Unit
Part 2 – Functional Description 2–169
3
2
4
5
1
Actions during
defrost start
Actions during start and execution of the defrost cycle.
1 DEFROST CONDITIONS SATISFIED.
2 Only 1 compressor in operation of this circuit during defrost.
3 Open Cooling EV completely.
4 30 seconds (A) normal SH control (heating) before defrost start.
5 DEFROST START.
6 Switch 4way valve and close heating EV totally.
7 Turn OFF fans.
8 Open Cooling EV with “initial pulses” 200pls (B pls) for 5 sec (B sec)
9 Continue normal SH control (cooling)
10 Mask low pressure protection control and superheat error during defrost.
Remark : the EWYQ080DAYN* has a modified control during defrost.
If the unit is starting a defrost cycle, then keep the number of running compressors.
- If 1 compressor is running then 1 compressor defrost.
- If 2 compressors are running then 2 compressor defrost.
Defrost starting conditions satisfied
Defrost start
Comp load 50%
heatingEV
CoolingEV
4way valve
Fan
Asec Bsec
ON
ON
OFF
B(PLS)
OFF
Completely
Open
Normal SH
Normal SH control
Low pressure mask
Superheat error mask
control
Totally open
EV

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