Maintenance
Perform all maintenance procedures and inspections at the recommended intervals.This will prolong the life of the chiller and minimize the possibility of costly failures. After the unit has been operating for approximately 30 minutes and the system has stabilized, check the operating conditions and complete the following procedures:
Weekly Maintenance
While the unit is running in stable conditions:
1.Check the UCM pressure for Evaporator, Condenser, and Intermediate Oil.
2.Measure the subcooling entering the EXV.The subcooling should never be less than 2.2°C under any circumstances.
CAUTION
Also check the rest of the system operating conditions.
3.Inspect the entire system for unusual conditions and inspect the condenser coils for dirt and debris. If the coils are dirty, refer to coil cleaning.
Monthly Maintenance
1.Perform all weekly maintenance procedures.
2.Record the system subcooling.
3.Record the system superheat.
4.Make any repairs necessary.
Annual Maintenance
1.Perform all weekly and monthly procedures.
2.Check the oil sump oil level while the unit is off.
Note: Routine changing of the oil is not required. Use an oil analysis to determine the condition of the oil.
3.Have a qualified laboratory perform a compressor oil analysis to determine system moisture content and acid level.This analysis is a valuable diagnostic tool.
4.Contact a qualified service organization to
components for deficiencies.
5.Inspect all piping components for leakage and damage. Clean out any inline strainers.
6.Clean and repaint any areas that show signs of corrosion.
7.Clean the condenser coils.
WARNING
Position all electrical disconnects in the "Open" position and lock them to prevent injury or death due to electrical shock.
8.Check and tighten all electrical connections as necessary.
Coil Maintenance
Because seacoast applications are considered to be a "dirty" environment for condenser coils, it is logical that the coils will need to be cleaned more often than a coil located inland. Cleaning four times a year may be required or even more if conditions are very poor or if corrosion damage begins to occur. To clean the coils, use a soft brush and a sprayer (garden
CAUTION
If the detergent used is strongly alkaline (pH greater than 8.5), an inhibitor must be added.
Rinse the coil thoroughly after cleaning. Failure to completely flush the detergent from the coil can result in accelerated coil corrosion. Blow excess water from the coil using low- pressure air. The water used to clean the coils should always be clean, fresh water (it should not be brackish, or contain excessive dissolved minerals, chlorine, or water softener salts.)
Chemical Cleaning of the Evaporator (RTUB)
The chilled water circuit is a closed circuit, and therefore should not accumulate scale or sludge. If the chiller becomes obstructed, you can attempt to unblock it by reversing the water flow direction. If unsuccessful after several attempts, clean the evaporator chemically.
WARNING
Do not use an acid cleaning product which might damage steel, galvanized steel, polypropylene and copper parts.
Contact a local water treatment company advice on a suitable chemical product for this unit. The supplier of the cleaning product must supply or approve:
•All devices used in the circuit
•The quantity of chemical product to use
•The duration for which the chemical product must circulate in the evaporator
•Safety precautions and recommendations for using and handling the chemical product
Replacing the Oil Filter
Note: Routine changing of the oil or oil filter is not recommended. The oil filter is oversized for this application and should not require replacement. The oil and filter should be replaced only if analysis reveals that the oil is contaminated. Oil type and system capacities are shown inTable 1. Pressure drop across the oil filter is shown in Figure 15. Oil filter pressure drop is the difference between the two
To change the oil filter in the unit, refer to Figure 15 and follow the steps listed.
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