Compressors-6 Stages - McQuay MicroTech II Installation And Maintenance Manual

Table 19 summarizes the staging sequencing for the 2 Small
Compressors & 2 Large compressor—6-Stage cooling
configuration.
Table 19: 2 small compressors & 2 large
compressors—6 stages
Stages
1
2
3
4
5
6
6 Compressors—6 Stages
There can be either six equally sized compressors or three
smaller and three larger sized compressors. Each compressor
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
cooling. The compressor with the fewest run hours is staged
on first and staged off last. Compressors #4, #5, or #6
provide 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 1). Disabled
compressors are not turned on.
Table 20 summarizes the staging sequencing for the 6
Compressor—6-Stage cooling configuration.
Table 20: 6 compressor—6-stage
Stages
1
2
3
4
5
6
24
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
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
McQuay IM 710-1