JOHNSON CONTROLS
120
FORM 150.62-NM8 (1020)
UNIT OPERATION
CONDENSER FAN CONTROL - YCAL0014 THROUGH YCAL0080 (CONT'D)
TABLE 28 – YCAL0014 THROUGH YCAL0080 CONDENSER FAN CONTROL USING
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
FWD
DP > Fan Ctrl On Press
DP < Fan Ctrl On Press –
(Diff. Press.)
8M
11M
TB7-9 TB10-9
3
4
*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)]
7M &
8M
10M &
11M
TB7-8
&
TB7-9
TB10-8
&
TB10-9
1 & 3
2 & 4
* NOTE:
STEP 2 is not active in the “Standard Ambient” mode. When changing to “Low Ambient” control, fan power wiring also changes.
TABLE 29 – YCAL0014 - YCAL0080 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 &
9M
11M &
12M
TB7-9
&
TB7-10
TB10-9
& TB10-
10
1 & 3
FWD
2 & 4
FWD
NOTE
: When
“Low Ambient”
control of the fans is selected, fan control will be by discharge pressure only.
Summary of Contents for YCAL0014E Series
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