York YCUL0045E, Installation Operation & Maintenance

Page: 92 / 144

JOHNSON CONTROLS
92
FORM 150.63-NM8 (1020)
UNIT CONTROLS
CONDENSER FAN CONTROL - YCUL0045 – YCUL0275
TABLE 24 – YCUL0045 - YCUL0275 LOW AMBIENT CONDENSER FAN CONTROL –
DISCHARGE PRESSURE CONTROL
When Low Ambient Control of the
fans is selected, fan control will be by
discharge pressure only.
FAN STAGE ON OFF
CONTACTOR
I/O BOARD
OUTPUT
FAN #
SYS 1 SYS 2 SYS 1 SYS 2 SYS 1 SYS 2
1
1 FAN REV
DP > Fan Ctrl On Press
DP < Fan Ctrl On Press
– Diff. Press.
7M 10M TB7-8 TB10-8 1 REV 2 REV
2
1 FAN FWD
DP > Fan Ctrl On Press
+ 20 PSIG (1.38 Bars)
DP < Fan Ctrl On Press.) –
[Diff Press. + 20 PSIG (1.38 Bars)]
8M 11M TB7-9 TB10-9 3 FWD 4 FWD
3
2 FANS
FWD
DP > Fan Ctrl On Press
+ 40 PSIG (2.76 Bars)
DP < Fan Ctrl On Press.) –
[Diff Press. + 40 PSIG (2.76 Bars)]
8M & 9M
11M &
12M
TB7-9
&
TB7-10
TB10-9
& TB10-10
1 & 3
FWD 2 & 4
FWD