Drive Replacement Instructions - York YK Service Instructions Manual

PROBLEM
Oil pressure will not regulate to
the setpoint in automatic mode.
VSOP drive will shut down and
autostart everyday at the same time.
The oil pump motor rotation
is reverse.
1. Remove power from the chiller at the main power
disconnect.
2. Wait 5 minutes for the DC Bus Voltage to decay to
a safe level.
3. Take note of all wiring connected to the VSOP
drive.
4. Remove all wiring from VSOP drive.
5. Remove the four screws on the VSOP drive and
the two screws holding the power resistor to the
right of the VSOP drive.
6. Carefully, remove the VSOP drive from the
heatsink. Do not nick or scratch the heatsink.
14
MEASUREMENTS REQUIRED
1. None

DRIVE REPLACEMENT INSTRUCTIONS

SOLUTION
1. (a) Verify wiring between VSOP
drive, refrigerant level control board
and micro board.
1. (b) If wiring is okay, continue
to the next step.
2. Connect the Run signal to
ground. Remove J4-1 and connect
it to J4-2. The oil pressure should
maintain a minimum pressure.
Connect J4-1 to ground. The oil
pressure should increase. If the
oil pressure does not increase,
replace the VSOP drive.
3. Remove the wire from J10-2 on the
micro board. Connect a 10K
resistor to J10-2 and +12V supply.
Program the oil pump for 45Hz.
Connect a meter across the
resistor. The reading should not be
0V or 12V, but around 6V. If the
voltage is 0V or 12V, replace the
micro board. If the voltage is 6V,
replace refrigerant level control
board.
1. Refer to the second paragraph
under Known Problems on
Page 3.
1. Reverse two of the wires on
M1-M3 of the VSOP drive.
7. Clean the heatsink with a rag and rubbing
alcohol.
8. Apply a thin coating of Heatsink grease (013-
02997-000) to the bottom of the VSOP drive.
9. Replace the VSOP drive and install the four mount-
ing screws using a torque of 18-20 ft.-lb.
10. Mount the power resistor to the right of the VSOP
drive.
11. Rewire the VSOP drive using Figure 3 on the next
page.
12. Reapply power to the chiller at the main power
disconnect.
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