Figure 28 - Ylua0248 - Ylua0298 Fan Location (Typical); Table 18 - Ylua0248 - Ylua0298 Condenser Fan Control Using Outdoor Ambient Temperature And Discharge Pressure; Table 19 - Ylua0248 - Ylua0298 Condenser Fan Control Using Discharge Pressure Only - York YLUA0248 Series Installation Operation & Maintenance

FORM 150.73-NM2
ISSUE DATE: 09/07/2020
CONDENSER FAN CONTROL - YLUA0248 – YLUA0298
TABLE 18 - YLUA0248 – YLUA0298 CONDENSER FAN CONTROL USING OUTDOOR AMBIENT
TEMPERATURE AND DISCHARGE PRESSURE
(Discharge pressure controls not function 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 FANS
DP > Fan Ctrl On Press
FWD
+ 40 PSIG (2.76 Bars)
TABLE 19 - YLUA0248 – YLUA0298 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
+ 40 PSIG (2.76 Bars)
FWD
* NOTE: STEP 2 is not active in the "Standard Ambient" mode. When changing to "Low Ambient" control, fan power wiring also changes.
Fan #1
FIGURE 28 - YLUA0248 – YLUA0298 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
SECTION 8 – UNIT OPERATION
I/O BOARD
CONTACTOR
OUTPUT
SYS 1 SYS 2 SYS 1 SYS 2
8M 11M TB7-9 TB10-9
TB7-8 TB10-8
7M & 10M &
& &
8M 11M
TB7-9 TB10-9
I/O BOARD
CONTACTOR
OUTPUT
SYS 1 SYS 2 SYS 1 SYS 2
8M 11M TB7-9 TB10-9
TB7-8 TB10-8
7M & 10M &
& &
8M 11M
TB7-9 TB10-9
Fan #4
LD07403A
FAN #
SYS 1 SYS 2
3 4
1 & 3 2 & 4
FAN #
SYS 1 SYS 2
3 4
1 & 3 2 & 4
8
129