Screw Compressor Central Chiller
Chapter 5: Maintenance
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5-2 Preventative Maintenance
A systematic preventive maintenance program helps avoid costly down time. It is
recommened that this service be performed on an annual basis to keep equipment operating at
peak efficiency. Call the Service Department to arrange a schedule of inspections.
Inspections include:
1.
Checking refrigerant suction and
discharge pressures.
2.
Checking safety and operating
controls.
3.
Checking voltage and amperage
of all motors.
4.
Checking all electrical
connections.
5.
Checking quantity of refrigerant.
6.
Checking compressor oil level.
7.
Annual oil sample analysis.
8.
Checking lubrication of motor and
pump bearings.
9.
Checking circulating pump operation.
10.
Checking flow through heat
exchangers.
11.
Checking compressor efficiency.
12.
Checking noise levels.
13.
Checking cleanliness of equipment
area.
Although the manufacturer does not recommend that you perform these maintenance
procedures on your own, the two items listed below (performed on a regular basis) will
increase the longevity and efficiency of your unit. It is recommended that you contact the
manufacturer to have any maintenance performed on this equipment.
Lubrication
Grease all fan bearings, fan motors, and pump motors that do not have permanently sealed
bearings. Remove the grease relief plug (motors only) before adding grease.
Failure to do so
may dislodge the bearing grease retainer which will eventually cause bearing failure
.
Lubricate components regularly, based only on the component manufacturer’s specifications
for frequency and lubricant.
Screw compressors require a special oil (Solest 170); failure to use this oil when lubricating
will
void the warranty.
Condenser Maintenance
Dirty condenser heat exchange surfaces reduce system capacity. Inspect and clean as needed.
Remote Air-Cooled
Brush or vacuum light dirt accumulations. Avoid bending or damaging the fins. Heavy soil
accumulations on the coil require professional steam cleaning or pressure washing by a
qualified refrigeration service technician. Washing from the outside will only make matters
worse.
