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SECTION 8 – UNIT OPERATION
CONDENSER FAN CONTROL - YLUA0468 – YLUA0498
CONDENSER FAN CONTROL
(YLUA0468 – YLUA0498 UNITS)
Condenser fan control on models YLUA0468 –
YLUA0498 will always be by discharge pressure. The
on pressure and the differential off pressure are pro-
grammable under the PROGRAM key.
TABLE 22 - YLUA0468 – YLUA0498 CONDENSER FAN CONTROL
FAN STAGE
ON
1
DP > Fan Ctrl On Press
1 FAN FWD
2
DP > Fan Ctrl On Press
2 FANS FWD
+ 20 PSIG (1.38 Bars)
3
DP > Fan Ctrl On Press
3 FANS FWD
+ 40 PSIG (2.76 Bars)
4
DP > Fan Ctrl On Press
4 FANS FWD
+ 60 PSIG (4.14 Bars)
FAN #1
FAN #2
FIGURE 30 - YLUA0468 – YLUA0498 FAN LOCATION
132
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)]
DP < Fan Ctrl On Press.) –
[(Diff Press.) + 60 PSIG (4.14 Bars)]
FAN #5
FAN #3
The following Figure and Table outlines fan sequenc-
ing for the various models. These models are equipped
to operate to 0°F ambient as a standard.
CONTACTOR
SYS 1 SYS 2 SYS 1
10M
14M
9M &
13M &
10M
14M
7M,
11M,
8M, &
12M &
10M
14M
7M,
11M,
8M,
12M,
9M,
13M,
10M
14M
FAN #7
FAN #6
FAN #4
FORM 150.73-NM2
ISSUE DATE: 09/07/2020
MICROBOARD
FAN #
OUTPUT TB-4
SYS 2 SYS 1 SYS 2
2
6
7
2 & 4
6 & 8
5 & 7
1, 3
2 & 5
6 & 9
& 7
2, 4
6, 8
1, 3,
& 5
& 9
5, 7
FAN #8
LD14099
JOHNSON CONTROLS
8
6 & 8
2, 4
& 8
2, 4,
6, 8
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