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CGWF-SVX01A-EN
Unit Maintenance
Periodic Maintenance
Perform all maintenance procedures and inspections at the recommended intervals.
This will prolong the life of the equipment and reduce the possibility of costly equip-
ment failures.
Use an "Operator's Log" such as the one in this section to record a weekly "operating
conditions history" for this unit. The operating log for this unit can be a valuable diag-
nostic tool for service personnel. By noticing trends in the operating conditions, the
operator can often foresee and prevent problem situations before they become seri-
ous.
If the unit does not operate properly during maintenance inspections, refer to "Trouble
Analysis".
Weekly Maintenance
Once the unit has been operating for about 10 minutes and the system has stabilized,
check operating conditions and complete the checkout procedures that follow.
•
Check compressor oil levels. Oil should be visible in the sight glass when the
compressor is running.
Operate the compressors for a minimum of three to four hours when
checking oil level, and check level every 30 minutes. If oil is not at proper
level after this period, have a qualified service representative add or
remove oil as required.
•
Check suction pressure and discharge pressure.
•
Check the liquid line sight glasses.
•
If operating pressures and sight glass conditions seem to indicate refrigerant
shortage, measure system superheat and system subcooling.
•
If operating conditions indicate an overcharge, slowly (to minimize oil loss)
remove refrigerant at the liquid line service valve.
•
Inspect remote condenser coils for cleanliness (CCAF only) and clean if required.
Refer to the condenser manufacturer's recommendations.
•
Inspect the entire system for unusual conditions. Use the operating log in this
section to record a weekly operating conditions history for the unit. A complete
operating log is a valuable diagnostic tool for service personnel.
Monthly Maintenance
•
Perform all weekly maintenance procedures.
•
Measure and record system superheat.
•
Measure and record system subcooling.
Annual Maintenance
•
Perform all weekly and monthly maintenance procedures.
•
Have a qualified service technician check the setting and function of each control
and inspect the condition of and replace compressor and control contactors if
needed.
•
If chiller is not piped to drain facilities, make sure drain is clear to carry away sys-
tem water.
•
Drain water from condenser (CGWF) and evaporator and associated piping sys-
tems. Inspect all piping components for leakage, damage, etc. Clean out any in-
line water strainers.
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