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RTAC-SVX01F-EN 149
Periodic Maintenance
Perform all maintenance procedures and inspections at the recommended intervals.
This will prolong the life of the chiller and minimize the possibility of costly failures.
Use an “Operator’s Log”, such as that shown at the end of the section, to record an
operating history for the unit. The log serves as a valuable diagnostic tool for service
personnel. By observing trends in operating conditions, an operator can anticipate and
prevent problem situations before they occur. If the unit does not operate properly
during maintenance inspections, refer to “Diagnostics and Troubleshooting”.
After the unit has been operating for approximately 30 minutes and the system has
stabilized, check the operating conditions and complete the procedures below:
Weekly Maintenance
While unit is running in stable conditions.
1. Check MP pressure for evaporator, condenser and intermediate oil.
2. Observe liquid line sight glass on EXV.
3. If liquid line sight glass has bubbles measure the subcooling entering the EXV.
The subcooling should never be less than 4 °F under any circumstances.
A clear sightglass alone does not mean that the system is properly charged.
Also check the rest of the system operating conditions.
4. Inspect the entire system for unusual conditions and inspect the condenser coils
for dirt and debris. If the coils are dirty, refer to coil cleaning.
Monthly Maintenance
1. Perform all weekly maintenance procedures.
2. Record the system subcooling.
3. Make any repairs necessary.
Annual Maintenance
1. Perform all weekly and monthly procedures.
2. Check oil sump oil level while unit is off.
NOTE: Routine changing of the oil is not required. Use an oil analysis to determine
the condition of the oil.
3. Have a qualified laboratory perform a compressor oil analysis to determine sys-
tem moisture content and acid level. This analysis is a valuable diagnostic tool.
4. Contact a qualified service organization to leak test the chiller, to check operating
and safety controls, and to inspect electrical components for deficiencies.
5. Inspect all piping components for leakage and damage. Clean out any inline
strainers.
6. Clean and repaint any areas that show signs of corrosion.
7. Clean the condenser coils.