JOHNSON CONTROLS
109
FORM 150.62-NM6 (103)
FAN #1
FAN #3
FAN #5
FAN #2
FAN #4
FAN #6
2
CONDENSER FAN CONTROL
(YCAL0090 – YCAL0124 CHILLERS)
Condenser fan control on models YCAL0090
– YCAL0124 will always be by discharge pressure.
The on pressure and the differential off pressure are
programmable under the PROGRAM key.
CONDENSER FAN CONTROL - YCAL0090 – YCAL0124
TABLE 30 – YCAL0090 - YCAL0094 CONDENSER FAN CONTROL
CONTACTOR
MICRO BOARD
FAN #
FAN STAGE ON OFF OUTPUT TB-4
SYS 1 SYS 2 SYS 1 SYS 2 SYS 1 SYS 2
1
DP > Fan Ctrl On Press
DP < Fan Ctrl On Press – (Diff. Press.)
9M 13M 2 6 5 6
1 FAN FWD
2 DP > Fan Ctrl On Press + DP < Fan Ctrl On Press – 8M & 12M &
2 FANS FWD 20 PSIG (1.38 Bars) [(Diff. Press.) + 20 PSIG (1.38 Bars)] 9M
13M
2 & 4 6 & 8 3 & 5 4 & 6
3 DP > Fan Ctrl On Press + DP < Fan Ctrl On Press – 7M, 8M, 11M, 12M 2, 4 6, 8 1, 3 2, 4
3 FANS FWD 40 PSIG (2.76 Bars) [(Diff. Press.) + 40 PSIG (2.76 Bars)] & 9M & 13M & 5 & 9 & 5 & 6
The following Figures and Tables outline fan sequencing
for the various models. These models are equipped to
operate to 0°F ambient as a standard.
FIG. 10 – YCAL0104 – YCAL0104 FAN LOCATION
LD07828
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