Table 20 - Ylua0248 - Ylua0298 Low Ambient Condenser Fan Control - Discharge Pressure Control - York YLUA0248 Series Installation Operation & Maintenance

SECTION 8 – UNIT OPERATION
CONDENSER FAN CONTROL - YLUA0248 – YLUA0298
TABLE 20 - YLUA0248 – YLUA0298 LOW AMBIENT CONDENSER FAN CONTROL –
DISCHARGE PRESSURE CONTROL
FAN STAGE ON
1
DP > Fan Ctrl On Press
1 FAN REV
2 DP > Fan Ctrl On Press
1 FAN FWD + 20 PSIG (1.38 Bars)
3
DP > Fan Ctrl On Press
2 FANS
+ 40 PSIG (2.76 Bars)
FWD
When Low Ambient Control of the fans is
selected, fan control will be by discharge
pressure only.
130
OFF
DP < Fan Ctrl On Press
– Diff. Press.
DP < Fan Ctrl On Press.) –
[Diff Press. + 20 PSIG (1.38 Bars)]
DP < Fan Ctrl On Press.) –
[Diff Press. + 40 PSIG (2.76 Bars)]
I/O BOARD
CONTACTOR
OUTPUT
SYS 1 SYS 2 SYS 1
7M 10M TB7-8
8M 11M TB7-9
TB7-9
11M &
8M & 9M &
12M
TB7-10
FORM 150.73-NM2
ISSUE DATE: 09/07/2020
FAN #
SYS 2 SYS 1 SYS 2
TB10-8 1 REV 2 REV
TB10-9 3 FWD 4 FWD
TB10-9 1 & 3 2 & 4
& TB10-10 FWD FWD
JOHNSON CONTROLS