Figure 29 - Ylua0308 - Ylua0408 Fan Location; Table 21 - Ylua0308 - Ylua0408 Condenser Fan Control - York YLUA0248 Series Installation Operation & Maintenance

FORM 150.73-NM2
ISSUE DATE: 09/07/2020
CONDENSER FAN CONTROL - YLUA0308 – YLUA0408
Condenser Fan Control
(YLUA0308 – YLUA0408 CONDENSING UNITS)
Condenser fan control on models YLUA0308 –
YLUA0408 will always be by discharge pressure. The
on pressure and the differential off pressure are pro-
grammable under the PROGRAM key.
TABLE 21 - YLUA0308 – YLUA0408 CONDENSER FAN CONTROL
FAN STAGE ON
1
DP > Fan Ctrl On
Press
1 FAN FWD
DP > Fan Ctrl On
2 Press
2 FANS FWD
+ 20 PSIG (1.38
Bars)
DP > Fan Ctrl On
3
Press
3 FANS FWD + 40 PSIG (2.76
Bars)
FAN #1
FAN #2
FIGURE 29 - YLUA0308 – YLUA0408 FAN LOCATION
JOHNSON CONTROLS
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)]
FAN #5
FAN #3
SECTION 8 – UNIT OPERATION
The following Figures and Tables outline fan sequenc-
ing for the various models. These models are equipped
to operate to 0°F ambient as a standard.
I/O BOARD
CONTACTOR
OUTPUT
SYS 1 SYS 2 SYS 1
10M 14M TB7-9
TB7-9
9M & 13M &
& TB7-
10M 14M
10
TB7-8,
12M,
TB7-9
8M, 9M
13M &
& 10M &
14M
TB7-10
FAN #
SYS 2 SYS 1 SYS 2
TB10-9 7 8
TB10-9
& TB10- 5 & 7 6 & 8
10
TB10-8,
TB10-9
3, 5 & 7 4, 6 & 8
& TB10-
10
FAN #6
FAN #4
LD14098
131
8