Figure 58 - Inverter Wiring; Table 28 - Ycal0043-0066 Vfd Low Ambient Option - Condenser Fan Control Operation - York YCAL0019 Installation, Operation And Maintenance Manual

FORM 150.67-NM1
ISSUE DATE: 4/28/2017
TO MICROBOARD (P4) TO MICROBOARD (P4)
TO MICROBOARD (P7) TO MICROBOARD (P7)

FIGURE 58 - INVERTER WIRING

TABLE 28 - YCAL0043-0066 VFD LOW AMBIENT OPTION – CONDENSER FAN CONTROL OPERATION
FAN STAGE
FAN SPEED
IS A FUNCTION
DISCHARGE
1:
PRESSURE.
VFD CONTROL
WHEN THE
(1 FAN
LIQUID LINE
VARIABLE
SOLENOID IS
SPEED)
ENERGIZED,
SPEED
INCREASES
WITH PRESSURE
2:
1 FAN VFD
425 PSIG,
CONTROL
BOTH FANS
2ND FAN
WILL BE
FULL SPEED
RUNNING FULL
UNDER
SPEED
CONTACTOR
CONTROL
JOHNSON CONTROLS
TB3
TB1 TB1 TB1
TB3 TB3
152A 152A
BLK BLK
WHT WHT
TO PANEL 7 M TO PANEL 7 M
TB3
TB1 TB1
TB3
BLK BLK 252A 252A
WHT WHT
TO PANEL 10 M TO PANEL 10 M
ON OFF
OF
FAN WILL
TURN OFF OR
TURN VERY
SLOWLY WHEN
PRESSURE
DROPS BELOW
260 PSIG.
DISCHARGE
PRESSURE
< 260 PSIG
(PRESSURE IS
< FAN CONTROL
ON PRESSURE
OF
425 PSIG
MINUS FAN
DIFFERENTIAL
PRESSURE OF
125 PSIG = 300
PSIG)
151A 151A
150A 150A 150 150
TO FAN #1 (EXIS TING HARNESS) TO FAN #1 (EXIS TING HARNESS)
251A 251A
250A 250A 250 250
TO FAN #2 (EXIS TING HARNESS) TO FAN #2 (EXIS TING HARNESS)
CONTACTOR MICROBOARD
SYS 1 SYS 2 SYS 1
7M 10M TB7-3
7M 10M TB7-3
& & AND
8M 11M TB7-10
SECTION 8 – UNIT OPERATION
TB2 TB2 TB2
151 151 152 152
TB2 TB2
251
251 252 252
LD11302
FAN #
SYS 2 SYS 1 SYS 2
TB10-9 1 2
TB10-9
1 2
AND
& &
TB10-
3 4
10
199
8