11-13
CONTROL SYSTEM
SM TQDCI 1-A.1 GB
EEV Opening
60
Change
to Idle
EEV is initialized by
current EEV o 20
and defined as 0.
200
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).
∑
+
=
CVi
OLi
i
EEV
EEV
EEV
EEVi
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
# of active IDU units
IDU Capacity Code
Mode
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.
CONTENTS