Table 18 - Ylaa Standard Condenser Fan Control Using Discharge Pressure; Only (5 Or 6 Fans Per System) - York YLAA0285SE Manual

SECTION 8 – UNIT OPERATION
TABLE 18 – 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 &
FAN STAGE 1 IS
ENERGIZED
DP >
PROGRAMMED
FAN CONTROL
3
ON PRESSURE
AND FAN
STAGES 1 & 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.
The time delay (fan delay timer) be-
tween turning fan stages on and off is
fixed at 5 seconds.
174
IPUII 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 TB7-9
DIFFERENTIAL
PRESSURE &
FAN STAGE 1
IS ENERGIZED
DP <
PROGRAMMED
FAN CONTROL
ON PRESSURE
MINUS TB7-8 &
PROGRAMMED TB7-9 &
DIFFERENTIAL TB7-10
PRESSURE &
FAN STAGES
1 & 2 ARE
ENERGIZED
FAN CONTACTOR
SYS 2 SYS 1 SYS 2
TB10-8 1-KF1 2-KF1
TB10-8 & 1-KF1 & 2-KF1 &
TB10-9 1-KF2 2-KF2
TB10-8 & 1-KF1 & 2-KF1 &
TB10-9 & 1-KF2 & 2-KF2 &
TB10-10 1-KF3 2-KF3
FORM 150.72-NM3 (1020)
ISSUE DATE 10/05/2020
FAN #
SYS 1 SYS 2
1-MF1 2-MF1
1-MF1 & 2-MF1 &
1-MF2 & 2-MF2 &
1-MF3 2-MF3
5 FAN:
1-MF1 &
1-MF2 &
1-MF3 &
5 FAN:
1-MF4 &
1-MF1 &
1-MF5
1-MF2 &
6 FAN:
1-MF3 &
1-MF1 &
1-MF4 &
1-MF2 &
1-MF5
1-MF3 &
1-MF4 &
1-MF5&
1-MF6
JOHNSON CONTROLS