Service manual

15-10
CONTROL SYSTEM > GC 24
SM HADDCI 1-A.2 GB
15.4.13.5.2 Step 3 limit
The speed cannot go higher than Step3RPS unless it was operating for more than 1 continuous minute
between Step3RPS - 5 and Step3RPS.
15.4.14 EEV Control
15.4.15.1 Operation Range
The EEV operation range is defined according to the operation mode as following
ODU Mode Normal operation IDU inactive Compressor off
SB 200
200
COOL 80 to 350 0
HEAT 70 to 400 60 to 140
15.4.15.2 Reaching target value rules
For all cases except at EEV initialization procedure, each EEV can move no more than 20 steps at a time.
15.4.15.3 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.
15.4.15.4 EEV Opening Determination
The target EEV value is the sum of open loop value (OL) and a result of the accumulative correction values
(CV).
EEV = EEV
OL
+ ∑ EEV
CV
15.4.15.5 EEV initial value determination
The EEV initial value (open loop) is determined according to the mode, and the capacity code of the unit.
Basic EEV Open loop
Mode
WNG72 and 80
12 34
COOL 220 - - -
HEAT 210 - - -
EEV Opening
60
Change
to Idle
EEV is initialized by
current EEV opening + 20
and defined as 0.
200
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