Table 22 - Ylaa Standard Condenser Fan Control Using Discharge Pressure Only (2, 3, Or 4 Fans Per System); Table 23 - Ylaa Standard Condenser Fan Control Using Discharge Pressure Only - York YLAA Series Installation Operation & Maintenance

SECTION 8 – UNIT OPERATION
TABLE 22 - YLAA STANDARD CONDENSER FAN CONTROL USING DISCHARGE PRESSURE ONLY (2, 3,
OR 4 FANS PER SYSTEM)
FAN
ON*
STAGE
DP > PROGRAMMED
1 FAN CONTROL ON
PRESSURE
DP > PROGRAMMED
FAN CONTROL ON
2 PRESSURE AND FAN
STAGE 1 IS ENER-
GIZED
DP > PROGRAMMED
FAN CONTROL ON
3 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.
The time delay (fan delay timer) between
turning fan stages on and off is fixed at
5 seconds.
156
IPUII I/O OUTPUT
OFF**
SYS 1
DP < PROGRAMMED
FAN CONTROL ON
PRESSURE MINUS
7B7-8
PROGRAMMED DIF-
FERENTIAL PRES-
SURE
DP < PROGRAMMED
FAN CONTROL ON
PRESSURE MINUS
TB7-8
PROGRAMMED DIF-
and
FERENTIAL PRES-
TB7-9
SURE AND FAN
STAGE 1 IS ENER-
GIZED
DP < PROGRAMMED
FAN CONTROL ON
TB7-8
PRESSURE MINUS
and
PROGRAMMED DIF-
TB7-9
FERENTIAL PRES-
and
SURE AND FAN
TB7-10
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 and
TB10-9 1-KF2 2-KF2
TB10- 1-KF1 2-KF1
8 and and and
TB10-9 1-KF2 2-KF2
and and and
TB10-10 1-KF3 2-KF3
FORM 150.72-ICOM6
ISSUE DATE: 12/29/2017
FAN #
SYS 1 SYS 2
1-MF1 2-MF2
1-MF1 2-MF1
and and
1-MF2 2-MF2
3 FAN: 3 FAN:
1-MF1 2-MF1
and and
1-MF2 2-MF2
and and
1-MF3 2-MF3
4 FAN: 4 FAN:
1-MF1 2-MF1
and and
1-MF2 2-MF2
and and
1-MF3 2-MF3
and and
1-MF4 2-MF4
JOHNSON CONTROLS