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I
SEQUENCE OF OPERATION
1. Chiller supply and return hoses should always be
connected during normal operation.
2. Fluid bypass valve is factory set at 20 PSI valve
design to allow minimum flow across heat
exchanger when process is not calling for cooling.
3. Pump circulates at all times when panel door
switch is in the Run position.
4. Compressor control circuit is energized when
pump is running.
5.
Digital temperature control energizes refrigerant
line solenoid valves based on leaving fluid
temperature.
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
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
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.
•
•
Check compressor oil in sight glass at bottom of compressor monthly. Inspect for any oil leaks.
Verify pump function quarterly. Confirm glycol supply pressure. Listen for abnormal sounds from the pump.
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Verify thermostat function quarterly. Check displayed temperature against a thermometer measurement.
•
Condenser should be cleaned at least every 6 months for proper operation and efficiency. Use a garden hose
and spray at an angle downward. Take care not to bend the condenser fins.
•
Lubricate fan motors every 12 months.
See warning below. With the cord unplugged (no power to the chiller), inspect control panel contacts on
•
compressor and pump contactors. Contact an electrician if replacements are needed.
WARNING: DO NOT ATTEMPT TO SERVICE ELECTRICAL COMPONENTS OR MAKE ADJUSTMENTS IN ELECTRICAL
PANEL WITHOUT PROPER TRAINING AND IMPLEMENTATION OF LOCKOUT/TAG-OUT SAFETY PROCEDURES
6. Refrigerant pressure will build and close the low
pressure control contact.
7. High pressure control will cut power to the
compressor contact disabling the compressor if
conditions cause high head pressure.
8. Door switch will pump down compressor then
turn off pump if switch is shut off during
compressor run cycle.
9. Line voltage power should be left on to main
terminal block at all times to keep crank case
heater energized during extended off cycles.
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