Front Twin Bearing Assembly; Removal And Installation; Figure 151 - Front Twin Bearing Assembly - Danfoss Turbocor VTT Series Service Manual

3.7.2.2 Front Twin Bearing
Assembly
Figure 151 - Front Twin
Bearing Assembly
3.7.2.2.1 Removal and
Installation
Compressor Components
The Front Twin Bearing maintains the shaft position during Compressor operation. Power is sent from
the PWM to allow the bearing to levitate the shaft. The Front Twin Bearing sends position signals back
to the CCM.
Front Twin Bearing Assembly Removal:
1. Isolate the Compressor power as described in the
section of this manual.
2. Isolate the Compressor and recover refrigerant.
3. Remove the four (4) or six (6) (depending on revision) M5x16 screws that hold the Motor Power
Cover in place.
4. Remove the Motor Power Cover.
5. Remove the three (3) M10 nuts and flat washers off the top of the copper spacers.
6. Remove motor power cables. Protect/isolate the cable ends.
7. Remove the eight (8) M5x16 screws that hold the Service Side Cover in place.
8. Remove the Service Side Cover.
9. Disconnect the IFV Cables and remove them from the clamp located on the Suction Housing
(see Figure 126 Suction Housing Cable Clamps).
10. Carefully lay the IFV Cable harness over the rear of the Compressor to prevent it from being
damaged.
11. Remove the cable harness from the pressure/temperature sensor on the Suction Housing.
12. Remove the retaining clip from the Suction Housing as shown in Figure 126 (Suction Housing
Cable Clamps).
13. Carefully lay the pressure/temperature sensor harness out of the way to prevent it from being
damaged.
14. Remove the IFV Assembly.
15. The Compressor will need to be lifted up to gain clearance for the Volute removal. A 5x5 wood
block under the rear foot and a piece of 6" u-channel under the front. This u-channel needs to be
12" long with a 12.5mm hole drilled in the center. There is a threaded hole under the Compressor
where the Volute meets the main Compressor housing. Fasten the u-channel to the Compressor
with a 12mm bolt (2.5 inches long).
16. Remove the screws at 10 o'clock, 2 o'clock, and 6 o'clock positions from the Suction Cover.
17. Install the Short Guide Pins in these positions. Refer to the
Appendix B.
Twin Bearing Assy.
Twin Bearing Assy.
Screw - 30 Nm (22
ft.lb.) (4 places)
"Electrical Isolation of the Compressor/VFD"
"Short Guide Pin" example in
M-SV-VT-001-EN Rev. A
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