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Maintenance
Semi-Annual Maintenance
WARNING
Rotating Components!
Failure to disconnect power before servicing could result
in rotating components cutting and slashing technician
which could result in death or serious injury.
Disconnect all electric power, including remote
disconnects before servicing. Follow proper lockout/
tagout procedures to ensure the power can not be
inadvertently energized.
1. With power disconnected, manually rotate the fan
wheel to check for obstructions in the housing or
interference with fan blades. Remove obstructions and
debris. Inspect for any damage to fan blades and
housing. Check impeller for wear/deposits/corrosion
and damage
2. 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
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.
70
PKG-SVX027A-EN
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