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FORM 150.72-ICOM6
ISSUE DATE: 12/29/2017
TABLE 23 - YLAA STANDARD CONDENSER FAN CONTROL USING DISCHARGE PRESSURE ONLY (5 OR 6
FANS PER SYSTEM)
FAN
ON*
STAGE
DP > PRO-
GRAMMED FAN
1
CONTROL ON
PRESSURE
DP > PRO-
GRAMMED FAN
CONTROL ON
2
PRESSURE AND
FAN STAGE 1 IS
ENERGIZED
DP > PRO-
GRAMMED FAN
CONTROL ON
3
PRESSURE AND
FAN STAGES 1
AND 2 ARE EN-
ERGIZED
* When a fan stage is turned on, the pressure for the next stage is increased 20 PSIG and ramped back to the programmed on pressure over
the next 20 seconds.
** When a fan stage is turned off (Programmed ON pressure minus the differential), the OFF pressure for the next stage is decreased 20 PSIG
and ramped back to the programmed OFF pressure minus the differential.
The time delay (fan delay timer) between
turning fan stages on and off is fixed at
5 seconds.
JOHNSON CONTROLS
IPUII I/O OUTPUT
OFF**
SYS 1
DP < PRO-
GRAMMED
FAN CONTROL
ON PRESSURE
TB7-8
MINUS PRO-
GRAMMED
DIFFERENTIAL
PRESSURE
DP < PRO-
GRAMMED
FAN CONTROL
ON PRESSURE
MINUS PRO-
TB7-8
GRAMMED
and
DIFFERENTIAL
TB7-9
PRESSURE
AND FAN
STAGE 1 IS
ENERGIZED
DP < PRO-
GRAMMED
FAN CONTROL
ON PRESSURE
TB7-8
MINUS PRO-
and
GRAMMED
TB7-9
DIFFERENTIAL
and
PRESSURE
TB7-10
AND FAN
STAGES 1 AND
2 ARE ENER-
GIZED
FAN CONTACTOR
SYS 2
SYS 1
SYS 2
TB10-8
1-KF1
2-KF1
TB10-8
1-KF1
2-KF1
and
and
and
TB10-9
1-KF2
2-KF2
TB10-8
1-KF1
2-KF1
and
and
and
TB10-9
1-KF2
2-KF2
and
and
and
TB10-10
1-KF3
2-KF3
SECTION 8 – UNIT OPERATION
FAN #
SYS 1
SYS 2
1-MF1
2-MF1
1-MF1
2-MF1
and
and
1-MF2
2-MF2
and
and
1-MF3
2-MF3
5 FAN:
5 FAN:
1-MF1
1-MF1
and
and
1-MF2
1-MF2
and
and
1-MF3
1-MF3
and
and
1-MF4
1-MF4
and
and
1-MF5
1-MF5
6 FAN:
6 FAN:
1-MF1
1-MF1
and
and
1-MF2
1-MF2
and
and
1-MF3
1-MF3
and
and
1-MF4
1-MF4
and
and
1-MF5
1-MF5
and
and
1-MF6
1-MF6
157
8
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