186
JOHNSON CONTROLS
FORM 201.21-NM4 (616)
186
JOHNSON CONTROLS
OPERATION
CONDENSOR FAN CONTROL (CON'T)
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
90
100
110
120
130
140
150
160
170
180
190
75
85
95
105
115
125
Ambient Air Temp (°F)
Di
sc
ha
rg
e
Pr
essu
re
(PSI
G
)
Fan On Press
Fan Off Press
`
LD10633
FIG. 42 - STANDARD IPLV FAN CONTROL
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
TABLE 11 - FAN STAGES AND CORRESPONDING OUTPUTS - (CON'T)
4 COMPRESSOR CHILLERS
4 FANS
5 FANS
6 FANS
OUTPUT
CONTACTORS
Stage 1
(1 Fan ON)
Sys 1 Fan 1
Sys 2 Fan 2
Sys 3 Fan 13
Sys 4 Fan 14
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 1 & 11
Sys 2 Fans 2 & 12
Sys 3 Fans 13 & 23
Sys 4 Fans 14 & 24
1
Sys 1: 4CR
Sys 2: 7CR
Sys 3: 10 CR
Sys 4: 13 CR
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 2
(2 Fans ON)
Sys 1 Fans 3 & 5
Sys 2 Fans 4 & 6
Sys 3 Fans 13 & 19
Sys 4 Fans 16 & 18
—
2
Sys 1: 5CR
Sys 2: 8CR
Sys 3: 11 CR
Sys 4: 14 CR
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 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 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
1 and 2
Sys 1: 4CR & 5CR
Sys 2: 7CR & 8CR
Sys 3: 10 CR & 11 CR
Sys 4: 13CR & 14 CR
—
Stage 4
(4 Fans ON)
Sys 1 Fans 3, 5, 7, & 9
Sys 2 Fans 4, 6, 8, & 10
Sys 3 Fans 13, 17, 19 & 21
Sys 4 Fans 16, 18, 20 & 22
—
2 and 3
Sys 1: 5CR & 6CR
Sys 2: 8CR & 9CR
Sys 3: 11 CR & 12 CR
Sys 4: 14CR & 15 CR
Stage 4
(4 Fans ON)
Sys 1 Fans 1, 3, 5, & 7
Sys 2 Fans 2, 4, 6, & 8
Sys 3 Fans 13, 15, 17 & 19
Sys 4 Fans 14, 16, 18 & 20
Stage 5
(5 Fans ON)
Sys 1 Fans 1, 3, 5, 7, & 9
Sys 2 Fans 2, 4, 6, 8, & 10
Sys 3 Fans 13, 15, 17, 19 & 21
Sys 4 Fans 14, 16, 18, 20 & 22
Stage 6
(6 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
1, 2, and 3
Sys 1: 4CR, 5CR, & 6CR
Sys 2: 7CR, 8CR, & 9CR
Sys 3: 10CR, 11 CR & 12 CR
Sys 4: 13 CR, 14 CR & 15 CR