Johnson Controls YORK Tempo YLAA Series, Installation Operation & Maintenance

Page: 161 / 192

FORM 150.72-NM1 (1020)
161
JOHNSON CONTROLS
8
TABLE 17 – YLAA STANDARD CONDENSER FAN CONTROL USING DISCHARGE PRESSURE ONLY
(2, 3, OR 4 FANS PER SYSTEM)
FAN
STAGE
ON* OFF**
IPUII I/O OUTPUT
FAN
CONTACTOR
FAN #
SYS 1 SYS 2 SYS 1 SYS 2 SYS 1 SYS 2
1
DP > PROGRAMMED
FAN CONTROL ON
PRESSURE
DP < PROGRAMMED
FAN CONTROL ON
PRESSURE MINUS
PROGRAMMED
DIFFERENTIAL
PRESSURE
7B7-8 TB10-8 1-KF1 2-KF1 1-MF1 2-MF2
2
DP > PROGRAMMED
FAN CONTROL
ON PRESSURE &
FAN STAGE 1 IS
ENERGIZED
DP < PROGRAMMED
FAN CONTROL ON
PRESSURE MINUS
PROGRAMMED
DIFFERENTIAL
PRESSURE &
FAN STAGE 1 IS
ENERGIZED
TB7-8 &
TB7-9
TB10-8 &
TB10-9
1-KF1 &
1-KF2
2-KF1 &
2-KF2
1-MF1 &
1-MF2
2-MF1 &
2-MF2
3
DP > PROGRAMMED
FAN CONTROL ON
PRESSURE AND FAN
STAGES 1 & 2 ARE
ENERGIZED
DP < PROGRAMMED
FAN CONTROL ON
PRESSURE MINUS
PROGRAMMED
DIFFERENTIAL
PRESSURE & FAN
STAGES 1 & 2 ARE
ENERGIZED
TB7-8 &
TB7-9 &
TB7-10
TB10-8 &
TB10-9 &
TB10-10
1-KF1 &
1-KF2 &
1-KF3
2-KF1 &
2-KF2 &
2-KF3
3 FAN:
1-MF1 &
1-MF2 &
1-MF3
4 FAN:
1-MF1 &
1-MF2 &
1-MF3 &
1-MF4
3 FAN:
2-MF1
& 2-MF2
& 2-MF3
4 FAN:
2-MF1 &
2-MF2 &
2-MF3 &
2-MF4
* 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.