1-Small Compressor & 3-Large Compressors/6-Stage; 6-Compressors/6-Stage - McQuay MicroTech II Installation And Maintenance Manual

Table 19 summarizes the staging sequencing for the 2-Small
Compressors & 2-Large compressor/ 6-Stage cooling con-
figuration.
Table 19: 2-Small Compressors & 2-Large compressor/
6-Stage
Stages
1
2
3
4
5
6

6-Compressors/6-Stage

There can be either six equally sized compressors or three
smaller and three larger sized compressors. Each compres-
sor is on an independent cooling circuit. The unit capacity is
increased or decreased by turning on and off compressors.
Compressors #1, #2 or #3 provide the first three stages of
IM710
Compressors
1 or 2
1,2
(1 or 2),( 3 or 4)
1,2,(3 or 4)
(1or 2),3,4
1,2,3,4
cooling. The compressor with the fewest run hours is staged
on first and staged off last. Compressors #4, #5 or #6 pro-
vide the last three stages of cooling. The compressor with
the fewest run hours is staged on first and staged off last.
For detailed information regarding circuit lead/lag operation,
refer to the "Compressor Staging" section of the applicable
operation manual (refer to Table 1 on page 3). Disabled
compressors are not turned on.
Table 20 summarizes the staging sequencing for the 6-Com-
pressor/6-Stage cooling configuration.
Table 20: 6-Compressor/6-Stage
Stages
1
2
3
4
5
6
Compressors
1 or 2
1,2 or 1,3 or 2,3
1,2,3
1,2,3, (4 or 5 or 6)
1,2,3, (4,5 or 4,6 or 5,6)
1,2,3,4,5,6
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