Emerson VSS, VSR, VSM service manual Service, General Comments, Removal Of Compressor From The Unit

Service

GENERAL COMMENTS

When working on the compressor, care must be taken to ensure that contaminants (i.e. water from melting ice, dirt and dust) do not enter the compressor while it is being serviced. It is essential that all dust, oil or ice that has accumulated on the outside of the com- pressor be removed before servicing the compressor.

When servicing the compressor, all gaskets, O-rings, roll pins and lock washers must be replaced when reassembling the compressor.

PREPARATION OF UNIT FOR SERVICING

A)Shut down the unit, open the electrical discon- nect switch and pull the fuses for the compressor motor to prevent the unit from starting. Put a lock on the disconnect switch and tag the switch to indicate that maintenance is being performed.

B)Isolate the unit by manually closing the discharge Stop valve. Allow the unit to equalize to suction pressure before closing the Suction Bypass. After the unit has equalized to suction pressure and suction valve closed, use an acceptable means to depressurize the unit that complies with all Local, State and Federal Ordinances.

C)Remove drain plugs from the bottom of com- pressor housing and the discharge manifold On units equipped with Suction Oil Injection (SOI) manually open the SOI solenoid valve below the compressor. Drain the oil into appropriate con- tainers.

REMOVAL OF COMPRESSOR FROM THE UNIT

After preparing the unit for service, the following steps should be followed when removing the compressor from the unit:

A)Disconnect the motor drive coupling from the compressor input shaft.

B)Disconnect all gas and oil piping which is at- tached to the compressor. When removing the suction strainer on gas compression units, the suction line should be supported to prevent it from sagging.

C)Replace oil drain in compressor housing and dis- charge manifold after oil has stopped draining.

D)Remove all electrical connections to the com- pressor.

E)On compressors with mounting feet, loosen and remove bolts holding the compressor to the base.

Keep compressor alignment shims together and mark the locations with a permanent marker.

F)On compressors with C-flange the motor/C- flange/compressor assembly must be supported with a chain fall or other lifting device before the bolts holding the compressor to the C-flange adapter can be removed.

G)Install appropriate lifting eye into the threaded hole on the top of the compressor.

Verify unit is properly secured to avoid compressor from falling. Re-verify all piping and electrical are properly disconnected prior to lifting unit.

H)Lift compressor from the base, verify the amount of room needed for clearance and weight of the bare compressor when the compressor is removed from the unit.

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