Unit installation

Maintenance
92 SCXF-SVX01K-EN
indicate an obstruction. Replace the filter drier if it
appears clogged.
7. Inspect the optional waterside economizer coil. Clean
the
coil to prevent airflow restrictions through the fins.
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 Table 46, p. 82
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: P
erform 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
cor
rosion. 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.
1. Leaving air temperature greater than 60°F
2. Entering air temperature is 80 - 90°F
3. Entering water temperature greater than 65°F
4. Compressors running at full load
5. Drain the condensing water system and inspect it
thoroughly
for fouling, clean condensers if necessary.