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Section 8: Unit operation
The time delay (fan delay timer) between
turning fan stages on and off is fixed at
5 seconds.
Table 25: YLAA Standard Condenser Fan Control Using Discharge Pressure Only (5 or 6 Fans per System)
FAN
ON*
STAGE
DP >
PROGRAMMED
1
FAN CONTROL
ON PRESSURE
DP >
PROGRAMMED
FAN CONTROL
2
ON PRESSURE
AND FAN STAGE
1 IS ENERGIZED
DP >
PROGRAMMED
FAN CONTROL
3
ON PRESSURE
AND FAN
STAGES 1 AND 2
ARE ENERGIZED
* 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.
182
IPU I/O OUTPUT
OFF**
SYS 1
DP <
PROGRAMMED
FAN CONTROL
ON PRESSURE
TB7-8
MINUS
PROGRAMMED
DIFFERENTIAL
PRESSURE
DP <
PROGRAMMED
FAN CONTROL
ON PRESSURE
MINUS
TB7-8
PROGRAMMED
and
DIFFERENTIAL
TB7-9
PRESSURE
AND FAN
STAGE 1 IS
ENERGIZED
DP <
PROGRAMMED
FAN CONTROL
ON PRESSURE
TB7-8
MINUS
and
PROGRAMMED
TB7-9
DIFFERENTIAL
and
PRESSURE
TB7-10
AND FAN
STAGES 1
AND 2 ARE
ENERGIZED
FAN CONTACTOR
SYS 2
SYS 1
SYS 2
TB10-8
1-KF1
2-KF1
TB10-8
1-KF1
2-KF1
and
and
TB10-9
1-KF2
2-KF2
TB10-8
1-KF1
2-KF1
and
and
TB10-9
1-KF2
2-KF2
and
and
TB10-10
1-KF3
2-KF3
Form 150.72-ICOM6
Issue date: 12/19/2023
FAN #
SYS 1
SYS 2
1-MF1
2-MF1
1-MF1
2-MF1
and
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
and
6 FAN:
6 FAN:
1-MF1
1-MF1
and
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
Johnson Controls
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Troubleshooting
