Maintenance
3. Install dust caps on all disconnected gas couplings except the one to be repaired.
4. Remove the compressor’s cover.
5. Use the Venting Procedure to Vent to Atmospheric Pressure to discharge all gas from the
compressor. This procedure includes disconnecting the adsorber to prevent venting it.
6. At the coupling to be repaired, hold the stationary part with one wrench. Use a second
wrench to disassemble the coupling.
7. Remove the old O-ring.
8. Wipe the O-ring groove to be sure it is clean. Lightly coat a new O-ring with vacuum grease.
Install the new O-ring.
9. For a threaded joint sealed with Teflon tape, remove all old tape and apply new tape.
10. Reassemble the coupling using two wrenches.
11. Perform the Gas Cleanup procedure.
AVOID CONTAMINATION. A leaking coupling on an adsorber should not be
repaired in the field. Consult a SCAI Service Center. Venting the adsorber will
introduce contaminants to the system that cannot be removed in the field.
To repair a manifold assembly coupling, vent the manifold to atmospheric
pressure using adapter fitting P/N 266395C or 255919B2. Follow steps 6 to 11
above.
Replace the Compressor Shell High Temperature Switch
Tool required: #2 Phillips screwdriver
The temperature switch fits into a depression on top of the compressor capsule under the
terminal box cover.
1. Stop the compressor. Disconnect the power to the compressor.
2. Remove the compressor’s top cover panel.
3. Lift off the cover of the terminal box on top of the compressor capsule. See Figure 7.
4. Disconnect wires 30 and 31 from the temperature switch terminals. Remove the retainer
containing the temperature switch. Discard the switch. Keep the retainer for reuse.
5. Put a new temperature switch into the retainer. Put the assembly onto the compressor
capsule and engage the retainer clips.
6. Connect wires 30 and 31 to the switch terminals.
7. Replace the terminal box cover.
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