Electra WNG 50 DCI Service Manual page 68

CONTROL SYSTEM
12.5.4 EEV Control
12.5.4.1 Operation Range
The EEV operation range is defined according to the operation mode as following
ODU Mode
SB
COOL
HEAT
12.5.4.2 Reaching target value rules
For all cases except at EEV initialization procedure, each EEV can move no more than 20
steps at a time.
12.5.4.3 EEV Operation when ODU changes to SB Mode
When the ODU mode is changed to SB, the following is performed immediately:
- EEV is set to 200.
- They remain in this position for 60 Sec.
Then, performs reset (homing) procedure.
-
EEV Opening
200
12.5.4.4 EEV Opening Determination
The target EEV value is the sum of open loop value (OL) and a result of the accumulative
correction values (CV).
12.5.4.5 EEV initial value determination
The EEV initial value (open loop) is determined according to the mode, and the capacity code
of the unit.
12-12
Normal operation
200
80 to 350
70 to 400
60
EEV is initialized by
Change
current EEV opening + 20
to Idle
and defined as 0.
Revision Y05-02
CONTENT
IDU inactive Compressor off
200
0
60 to 140
Service Manual - WNG 50_60_80 DCI