Compressor Groups
PAK Software Overview • 19
mented. Note that this is not necessarily a rec-
ommendation for setting up all packs using a
MultiFlex PAK controller; choose a fixed step
strategy that is appropriate for each installation.
6.1.5. Suction Float
The E2, in conjunction with the PAK, may
be programmed to adjust, or "float" the suction
pressure setpoint based on the case temperatures
of one or more cases. This feature is called
suc-
tion float
.
Suction float combines the case temperatures
from up to 20 different sources into a single tem-
perature value (either by taking the average
value, the median value, or the maximum value).
This value is then compared to the suction float
setpoint and a deadband range around the set-
point. As a result of this comparison, the E2 may
adjust the suction pressure setpoint higher or
lower in an attempt to move the combined case
Group
# Com-
pressors
Step
Group ON
Group OFF
# of Compressors
ON
1
1
1
None
1, 2, 3, 4, 5
0
2
3
2
1
2, 3, 4, 5
1
3
3
3
5
1, 2, 3, 4
2
4
4
4
1, 5
2, 3, 4,
3
5
2
5
1, 2
3, 4, 5
4
6
2, 5
1, 3, 4
5
7
2, 3
1, 4, 5
6
8
3, 4
1, 2, 5
7
9
1, 3, 4
2, 5
8
10
3, 4, 5
1, 2
9
11
1, 3, 4, 5
2
10
12
1, 2, 3, 4
5
11
13
2, 3, 4, 5
1
12
14
1, 2, 3, 4, 5
None
13
Table 6-1
- Example Setup of Fixed Step Strategy
Summary of Contents for MultiFlex PAK
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