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OPERATION
TABLE 11 - FAN STAGES AND CORRESPONDING OUTPUTS - (CON'T)
4 FANS
Stage 1
(1 Fan ON)
Sys 1 Fan 1
Sys 2 Fan 2
Sys 3 Fan 13
Sys 4 Fan 14
Stage 2
(2 Fans ON)
Sys 1 Fans 3 & 5
Sys 2 Fans 4 & 6
Sys 3 Fans 15 & 17
Sys 4 Fans 16 & 18
Stage 3
(3 Fans ON)
Sys 1 Fans 1, 3, & 5
Sys 2 Fans 2, 4 & 6
Sys 3 Fans 13, 15, & 17
Sys 4 Fans 14, 16 & 18
—
Sys 3 Fans 13, 17, 19 & 21
Sys 4 Fans 16, 18, 20 & 22
Stage 4
(4 Fans ON)
Sys 1 Fans 1, 3, 5, & 7
Sys 1 Fans 1, 3, 5, 7, & 9
Sys 2 Fans 2, 4, 6, & 8
Sys 2 Fans 2, 4, 6, 8, & 10
Sys 3 Fans 13, 15, 17 & 19
Sys 3 Fans 13, 15, 17, 19 & 21
Sys 4 Fans 14, 16, 18 & 20
Sys 4 Fans 14, 16, 18, 20 & 22
Standard IPLV Fan Control
Fan staging ON and OFF points will be determined
by the ambient temperature. The fan stage will be
incremented, unless the 5 second timer between fan
stages is still timing when the discharge pressure rises
Standard IPLV Fan Control
190
180
170
160
150
140
130
120
110
100
90
75
85
95
105
Ambient Air Temp (°F)
FIG. 42 - STANDARD IPLV FAN CONTROL
186
186
CONDENSOR FAN CONTROL (CON'T)
4 COMPRESSOR CHILLERS
5 FANS
Stage 1
(1 Fan ON)
Sys 1 Fan 1
Sys 2 Fan 2
Sys 3 Fan 13
Sys 4 Fan14
Stage 2
(2 Fans ON)
Sys 1 Fans 3 & 5
Sys 2 Fans 4 & 6
Sys 3 Fans 13 & 19
Sys 4 Fans 16 & 18
Stage 3
(3 Fans ON)
Sys 1 Fans 1, 3, & 5
Sys 2 Fans 2, 4 & 6
Sys 3 Fans 13, 15 & 17
Sys 4 Fans 14, 16 & 18
Stage 4
(4 Fans ON)
Sys 1 Fans 3, 5, 7, & 9
Sys 2 Fans 4, 6, 8, & 10
Stage 5
(5 Fans ON)
Sys 1 Fans 1, 3, 5, 7, 9, & 11
Sys 2 Fans 2, 4, 6, 8, 10, & 12
Sys 3 Fans 13, 15, 17, 19, 21 & 23
Sys 4 Fans 14, 16, 18, 20, 22 & 24
Fan On Press
Fan Off Press
`
115
125
LD10633
6 FANS
Stage 2
(2 Fans ON)
Sys 1 Fans 1 & 11
Sys 2 Fans 2 & 12
Sys 3 Fans 13 & 23
Sys 4 Fans 14 & 24
—
Stage 4
(4 Fans ON)
Sys 1 Fans 1, 3, 5, & 11
Sys 2 Fans 2, 4, 6, & 12
Sys 3 Fans 13, 15,17 & 23
Sys 4 Fans 14, 16, 18 & 24
—
Stage 6
(6 Fans ON)
above the Fan ON Press. The fan stage is decremented,
unless the 5 second timer between fan stages is still
timing when the discharge pressure falls below the Fan
OFF Press. When a fan stage is incremented, the fan
delay timer is set to 5 seconds, and the Fan ON pressure
is ramped 20 PSIG over the original ON point back to
the original value over the next 20 seconds. When a
fan stage is decremented, the fan delay timer is set to 5
seconds, and the Fan OFF pressure is ramped 20 PSIG
below the original Fan OFF point, back to the origi-
nal value over the next 20 seconds. The ON and OFF
points will vary as ambient temperature changes. FIG.
42 below shows the fan ON and OFF points relative to
ambient temperature.
Optimized IPLV Fan Control
Fan staging on and off points will be determined by the
ambient temperature. The fan stage will be incremented,
unless the 5 second timer between fan stages is still
FORM 201.21-NM4 (1020)
OUTPUT
CONTACTORS
Sys 1: 4CR
Sys 2: 7CR
1
Sys 3: 10 CR
Sys 4: 13 CR
Sys 1: 5CR
Sys 2: 8CR
2
Sys 3: 11 CR
Sys 4: 14 CR
Sys 1: 4CR & 5CR
Sys 2: 7CR & 8CR
1 and 2
Sys 3: 10 CR & 11 CR
Sys 4: 13CR & 14 CR
Sys 1: 5CR & 6CR
Sys 2: 8CR & 9CR
2 and 3
Sys 3: 11 CR & 12 CR
Sys 4: 14CR & 15 CR
Sys 1: 4CR, 5CR, & 6CR
Sys 2: 7CR, 8CR, & 9CR
1, 2, and 3
Sys 3: 10CR, 11 CR & 12 CR
Sys 4: 13 CR, 14 CR & 15 CR
JOHNSON CONTROLS
JOHNSON CONTROLS
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