Mueller E-Star OESE 3.5 and 5 HP HFC Condensing Unit
Installation and Operation Manual, Part No. 8828747
Effective April 13, 2020
10.2 MAINTENANCE PROCEDURES
Mueller E-Star OESE condensing units require minimal maintenance. The following scheduled maintenance
procedures are recommended and should be performed by a knowledgeable service technician on an annual basis:
1. Clean the condenser tubes and fins from accumulated dust or other foreign matter to ensure proper air flow.
2. Check the refrigerant charge described in Section 3.3. If the charge is low, perform a leak test on the complete
system and repair.
3. Check for proper superheat as described in Section 5.
4. Check for proper incoming supply voltage.
5. Measure the compressor’s amperage draw. Verify it is within 10% of the compressor’s technical data chart.
6. Check all electrical connections, ensuring that they are clean and tight.
7. Check the compressor’s wrap-around crankcase heater for proper operation.
8. Check for proper operation of the low-, high-, and fan-pressure switches as described in Section 8.
9. Complete a performance survey for each condensing unit, verifying proper cooling capacity. The survey is
attached at the end of this manual.
10.3
SAFETY ALERT
All maintenance and service must be performed by trained and knowledgeable service technicians.
Individuals who are not trained and certified in proper refrigeration and electrical procedures should not
attempt servicing this equipment.
This equipment starts automatically!
All guards and covers must be in place during operation to prevent mechanical and electrical hazards!
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