Monthly
1. Leak check the entire chiller.
2. Check the oil return system operation.
3. Check the operation of the motor starter.
4. Check the sump heater and thermostat operation.
5. Check the three-phase voltage and current balance.
6. Verify the correct operation, setting, and calibration of safety controls.
7. Verify the condenser and evaporator water flows.
8. Perform a leak check and repair leaks as needed.
Annually (more often if necessary)
1. Chiller oil circuit:
a. Conduct an oil analysis and record the results.
b. Drain and replace the oil in the compressor oil sump. See Oil charging procedure. The
maximum period between oil changes is 5 years.
c. Replace the oil filter(s).
d. Replace the filter driers in the oil eductor circuit.
2. VSD or starter:
a. Check and tighten all electrical connections.
b. Change the VSD inhibitor in accordance with the 60.00-M12 instructions.
c. Clean the condenser/evaporator side of the VSD external heat exchanger.
d. Replace or clean the starter or drive air filters where applicable.
3. Evaporator and condenser:
a. Inspect and clean the water strainers.
b. Inspect and clean the tubes as required.
c. Inspect the end sheets.
4. Drive motor (see Motor relubrication instruction or refer to SI0305):
a. Clean the air passages and windings according to the manufacturer’s instructions.
b. Meg the motor windings. See for details.
c. Lubricate according to motor manufacturer recommendations.
d. Conduct vibration testing and record the results.
5. Compressor:
- Conduct vibration testing and record results.
6. Chiller systems:
a. Inspect and service all chiller system electrical components as necessary.
b. Perform refrigerant analysis.
15Model YK (Style H), R-134a and R-513A
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