Danfoss Turbocor VTT Series Service Manual Download

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M-SV-VT-001-EN Rev. A

Compressor Removal and Installation

7.3 Compressor

Installation

12. Reinstall the Service Side Cover.
13. Once the transfer of refrigerant is complete, bring the compressor back to atmospheric pressure

according to industry standards using dry nitrogen.

14. Disconnect the motor cooling inlet and exit lines.
15. Remove the 12 M20x2.5 screws between the suction pipe flange and the compressor suction

flange.

16. Remove the eight (8) M20x2.5 screws between the discharge pipe flange and the compressor

discharge flange.

17.   Position the lifting hoist/crane with the 2-point spreader bar directly above the lifting points.
18.   Using a properly rated chain/cable, connect the spreader bar to the compressor lifting points.
19.   Confirm that all lifting points are secured in accordance with relevant safety procedures and

standards.

20.   Loosen the four (4) compressor mounting bolts but do not remove.
21.   Using a 454 kg (1 ton) (minimum) crane, lift to remove the slack from the chains/cables.
22.   Remove the four (4) compressor mounting bolts and associated hardware.
23.   Lift the compressor approximately 100 mm (4”). Confirm that the compressor and spreader bar

are properly balanced between the lifting points and the lifting hoist.

24. Continue the removal of the compressor and lower to the desired location in order to remove

the chains/cables.

25. Using the blanking plates and bolts provided with the new compressor, seal the compressor and

charge to approximately 25-50 psi with a nontoxic inert gas (e.g., helium, nitrogen) for shipment

(this will prevent moisture and foreign material from entering the compressor)

NOTE

Blanking plates should not be removed from the new compressor until you are ready to place the

new compressor in position. New compressors are pressurized with helium to (50 psi). Pressure

should be relieved through the Schrader valve, located next to the motor cooling connection, prior

to removing the blanking plates. Isolation and recovery of the refrigerant must be performed by a

qualified technician. Always wear proper safety equipment when handling refrigerants.

1. Relieve the inert gas pressure through the motor cooling exit port Schrader valve.
2. Remove the suction, discharge, and economizer (if applicable) blanking plates from the

compressor.

3.   Ensure that all connections have protective connections to prevent foreign object damage.
4.   Attach the spreader bar to the two (2) lifting hooks (eye bolts) on the top of the compressor.
5.   Confirm that all lifting points are secured in accordance with relevant safety procedures and

standards.

6. Position the lifting hoist/crane with the 2-point spreader bar directly above the lifting points.
7. Using a 454 kg (1 ton) (minimum) crane, lift the compressor approximately 100 mm (4”). Confirm

that the compressor and spreader bar are properly balanced between the lifting points and the

lifting hoist.

8. Slowly lower the compressor until it is positioned within approximately 5 mm (¼”) of the

compressor mounts.

9. Loosely install the mounting bolts, nuts, and washers.
10. Loosely fit the gasket and M20x2.5 screws between the suction pipe flange and the compressor

suction flange.