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Maintenance
8. Check and record operating pressures.
Semi-Annual Maintenance
1. Verify the fan motor is properly lubricated. Follow
lubrication recommendations on the motor tag or
nameplate. Contact the motor manufacturer for more
information.
2. Lubricate fan bearings. For best results, lubricate
bearings during unit operation. Refer to the "Fan
Bearings" section for recommended grease.
Note: The bearings are manufactured using a special
synthetic lithium-based grease designed for long
life and minimum lube intervals. Over lubrication
can be just as harmful as not enough.
3. With power disconnected, manually rotate the fan
wheel to check for obstructions in the housing or
interference with fan blades. Remove obstructions and
debris. Center the fan wheel if necessary.
4. Check the fan assembly sheave alignment. Tighten set
screws to their proper torques.
5. Check water valves for leakage at valve stem packing
nut.
Note: Perform this procedure monthly if the unit is in a
coastal or corrosive environment.
Annual Maintenance
Check and tighten all set screws, bolts, locking collars and
90
sheaves.
1. Inspect, clean, and tighten all electrical connections.
2. Visually inspect the entire unit casing for chips or
corrosion. Remove rust or corrosion and repaint
surfaces.
3. Visually check for leaks in refrigerant piping.
4. Inspect fan, motor, and control contacts. Replace badly
worn or eroded contacts.
5. Inspect the thermal expansion valve sensing bulbs for
cleanliness, good contact with the suction line, and
adequate insulation from ambient air.
6. Verify the superheat setting is 12 -17°F at the
compressor.
When checking operating pressures and conditions,
establish the following nominal conditions for consistent
measurements.
•
Leaving air temperature greater than 60°F
•
Entering air temperature is 80 - 90°F
•
Entering water temperature greater than 65°F
•
Compressors running at full load
•
Drain the condensing water system and inspect it
thoroughly for fouling; clean if necessary.
SCXF-SVX01T-EN
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