Removing The Pre-Rotation Vane Housing - York YDHF-39 Manual

4. Apply a light coating of oil and Molykote onto the
eye of the impeller where it enters the eye seal ring.
5. Using proper rigging methods, raise the rotor sup-
port with motor adapter into proper position, and
slide it into place over the guide pins.
6. Carefully slide the rotor support into place against
the scroll housing. Use care that the impeller is not
damaged as it enters the eye seal ring.
7. Insert the cap screws and tighten to the proper
torque. (See Table 4)
8. Re-install the compressor coupling.
9. Bolt the motor to the motor adaptor.
10. Re-connect all external piping.

REMOVING THE PRE-ROTATION VANE HOUSING

The Pre-Rotation Vane Assembly cannot be removed
from the suction connection side of the compressor on
the HA, HB and HD style compressors. The rotor sup-
port must first be removed from the rotor scroll and the
rotor scroll dissembled as described previously.
On the HF style compressor, access to the PRV assem-
bly can be made by removing the suction piping and re-
moving the cap screws that secure the PRV plate sup-
port to the rotor scroll. Insert proper guide pins and using
proper rigging methods, remove PRV support plate from
compressor scroll to gain access to the PRV assembly.
(See Fig. 69)
PRV SUPPORT
GUIDE PIN
PLATE
FIG. 69 – REMOVING HF PRV SUPPORT PLATE
YORK INTERNATIONAL
FIG. 70 – INTERNAL PARTS - PRE-ROTATION
VANE ASSEMBLY
ITEM
DESCRIPTION
NO.
1 Ring, Driving
2 Vane
3 Retainer
4 Arm, Vane
5 Spacer, Arm
00593VIP
6 Washer
FIG. 71 – PRE-ROTATION VANE
HOUSING ASSEMBLY
FORM 160.49-M1
PRE-ROTATION
VANE DRIVING RING
INTERNAL LEVER
ITEM
QTY. DESCRIPTION
NO.
1 7 Washer
9 8 Stud, Ball
9 9 Screw – 12 pt.
9 10 Screw – Hex HD
9 11 Nut, Self-Locking
9 12 Housing
2
26666A
26667A
LD05191
QTY.
10
9
9
18
9
1
35