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I
MAINTENANCE
GENERAL
Perform all maintenance procedures and inspection at the recommended intervals. This will prolong the life of the
chiller and minimize the possibility of malfunctions.
Use an "Operator's Log" to record the unit's operating history. 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 is not operating properly during maintenance inspections, consult the "Diagnostic and
Troubleshooting" section of this manual.
WEEKLY/MONTHLY MAINTENANCE
Please contact G&D Technical Support if you have any questions or concerns regarding the performance, operation,
or maintenance of your chiller: 800-555-0973
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Refer to the separate G&D Chillers Preventive Maintenance Checklist for a complete list of maintenance tasks.
Contract a licensed refrigeration technician to evaluate the chiller refrigeration circuit(s) regularly. These
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checkups should occur annually at a minimum. Every 3-6 months is recommended.
The following tasks can be performed without the need for specialized equipment or training:
Check glycol level and glycol/water ratio monthly. Use glycol refractometer to confirm 35% glycol mixture.
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Check compressor oil in sight glass at bottom of compressor monthly. Inspect for any oil leaks.
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Verify pump function quarterly. Confirm glycol supply pressure. Listen for abnormal sounds from the pump.
Verify thermostat function quarterly. Check displayed temperature against a thermometer measurement.
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Condenser should be cleaned at least every 6 months for proper operation and efficiency. Use a garden hose
and spray at an angle. If using harsh water, condenser cleaner will be needed.
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See warning below. With the service disconnect in the OFF position (no power to the chiller), inspect control
panel contacts on compressor and pump contactors. Contact an electrician if replacements are needed.
WARNING: Position all electrical disconnects in the "OPEN" position and lock them to prevent injury of death due
to electrical shock or moving parts.
ANNUAL MAINTENANCE
Complete all weekly and monthly maintenance checks.
Check the oil level and refrigerant charge. Routine changing of oil is not required.
Have a qualified laboratory perform a compressor oil analysis to determine system moisture content and acid level.
This analysis is a valuable diagnostic tool. Contact a qualified service provider to leak test the chiller, check operating
and safety controls, and to inspect electrical components for proper operation. Leak testing may be accomplished
using soap solution or with electronic or ultrasonic leak detectors.
Inspect all piping components for leaks and damage.
Clean all fluid strainers. Clean and repaint any components that show corrosion.
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