JOHNSON CONTROLS
136
FORM 150.73-NM1
ISSUE DATE: 09/04/2020
SECTION 8 – UNIT OPERATION
CONDENSER FAN CONTROL - YLUA0078 – YLUA0095
TABLE 27 -
YLUA0078 – YLUA0095 LOW AMBIENT CONDENSER FAN CONTROL –
DISCHARGE PRESSURE CONTROL
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
and
9M
11M
and
12M
TB7-9
and
TB7-10
TB10-9
and
TB10-10
1 and
3 FWD
2 and
4 FWD
When Low Ambient Control of the fans is
selected, fan control will be by discharge
pressure only.
Summary of Contents for YLUA0078
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