Ycul0045 - Ycul0275 Condenser Fan Control Using; Ycul0045 - Ycul0275 Condenser Fan Control Using Dp Only; Ycul0045 - Ycul0275 Fan Location (Typical) - York YCUL0045 Installation Operation & Maintenance

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