Service manual

200
CONTROL SYSTEM
EEV Opening
Change
current EEV opening + 20
60
EEV is initialized by
to Idle
and defined as 0.
11.5.3.4 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
i
 EEV
OLi


EEV
CVi
EEV
i
is the EEV opening for each ‘i’ IDU.
11.5.3.5 EEV initial value determination
The EEV initial value (open loop) is determined according to the number of the active indoor
units, mode, and the capacity code of the unit.
Basic EEV open loop Open Loop correction
Mode
# of active IDU units IDU Capacity Code
1 2 3 4 1.5 2
COOL 220 200 170 150 10 25
HEAT 210 190 150 130 20 40
11.5.3.6 Balance time
During the first 6 minutes after SB the correction is not calculated. After that the correction
value is updated every 30 seconds.
11.5.3.7 EEV corrections
The corrections in cool mode will keep the compressor in the proper operation temperature and
will balance between the indoor units by controlling their super heat.
11.5.3.8 Accumulative correction value storage
For each combination of active IDUs, the accumulated EEV correction value (for each IDU) will
be stored in the memory. Default correction values after power up are zero.
Revision 0
11-13