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JOHNSON CONTROLS
115
FORM 150.63-NM6 (1020)
2
FIG. 17 –
YCUL0045 – YCUL0275 FAN LOCATION (TYPICAL)
LD07403
CONDENSER FAN CONTROL - YCUL0045 – YCUL0275
TABLE 26 –
YCUL0045 – YCUL0275 CONDENSER FAN CONTROL USING OUTDOOR AMBIENT TEMPERA-
TURE AND DISCHARGE PRESSURE (DISCHARGE PRESSURE CONTROLS WILL NOT FUNC-
TION UNLESS THE OPTIONAL DISCHARGE PRESSURE TRANSDUCER IS INSTALLED)
CONTACTOR
MICRO BOARD
FAN #
FAN STAGE
ON
OFF
OUTPUT TB-4
SYS 1 SYS 2
SYS 1 SYS 2
SYS 1 SYS 2
1
OAT >25°F (-3.9°C)
OAT < 20°F (-6.7°C)
1 FAN FWD
OR
AND
8M 11M
4 8
3 4
DP > Fan Ctrl On Press
DP < Fan Ctrl On Press – (Diff. Press.)
*3
OAT >65°F (18.3°C)
OAT < 60°F (15.6°C)
2 FAN FWD
OR
AND
7M & 10M &
2 & 4 6 & 8
1 & 3 2 & 4
DP > Fan Ctrl On Press
DP < Fan Ctrl On Press –
8M
11M
+ 40 PSIG (2.76 Bars)
[Diff. Press + 40 PSIG (2.76 Bars)]
TABLE 27 –
YCUL0045 – YCUL0275 CONDENSER FAN CONTROL USING DISCHARGE PRESSURE ONLY
CONTACTOR
MICRO BOARD
FAN #
FAN STAGE
ON
OFF
OUTPUT TB-4
SYS 1 SYS 2
SYS 1 SYS 2
SYS 1 SYS 2
1
DP > Fan Ctrl On Press DP < Fan Ctrl On Press – (Diff. Press.)
8M 11M
4 8
3 4
1 FAN FWD
*3
DP > Fan Ctrl On Press +
DP < Fan Ctrl On Press –
7M & 10M &
2 & 4 6 & 8
1 & 3 2 & 4
2 FANS FWD
40 PSIG (2.76 Bars)
[(Diff. Press.) + 40 PSIG (2.76 Bars)]
8M
11M
* NOTE:
STEP 2 is not active in the “Standard Ambient” mode. When changing to “Low Ambient” control, fan power wiring also changes.
Fan #1
Fan #2
Fan #3
Fan #4
Summary of Contents for YCUL0045
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