Carrier 17/19EX - Manual (Page 229)

effects of overpressure. To ensure against damage to the equipment and possible injury to
personnel, these devices must be kept in peak operating condition.
As a minimum, the following maintenance is required.
1. At least once a year, disconnect the vent piping at the valve outlet and carefully inspect the
valve body and mechanism for any evidence of internal corrosion or rust, dirt, scale,
leakage, etc.
2. If corrosion or foreign material is found, do not attempt to repair or recondition. Replace the
valve .
3. If the machine is installed in a corrosive atmosphere or the relief valves are vented into a
corrosive atmosphere, make valve inspections at more frequent intervals.
Coupling Maintenance (Open-Drive Machines)
Proper maintenance of the coupling is important since the coupling supports the outboard
end of the compressor low speed shaft. Only the compressor end of the coupling has gear teeth
and these are manufactured with special tolerances for this application.
Procedure
Clean and inspect the gear teeth in the compressor end coupling for wear yearly. If the teeth
are worn, replace the tapered coupling hub, sleeve and O-ring. Repack the gear teeth and