(Mar, 2012)
Compact CWE Series Installation, Operation & Maintenance Manual
Air Technology Systems, Inc.
4-1
4.0
MAINTENANCE
4.1 Periodic General Maintenance
Systematic, periodic general maintenance of the
Compact CWE
system is recommended for optimum
performance. General maintenance should include,
but is not limited to the following: replacing fi lters and
humidifi er cylinders, tightening electrical connections,
checking the water lines to ensure they are free of
debris, ensuring no air is in the water line(s), cleaning
the interior of the unit and inspecting the unit’s
components visually.
Use copies of the Periodic General Maintenance
Checklist in this manual (see Appendix A) to record
periodic general maintenance inspections. For
assistance, contact SATS Product Support. Ensure
adherence to all safety statements while performing
any type of maintenance.
WARNING
This equipment should be serviced and
repaired by a journeyman or a qualifi ed
refrigeration technician only.
WARNING
This unit employs high voltage equipment with
rotating components. Exercise extreme care to
avoid accidents and ensure proper operation.
Hazardous voltage will still be present inside the elec-
tric box at the motor start protectors and at the heater
and humidifi er circuit breakers, even with the unit
turned off at the microprocessor controller. To isolate
the unit for maintenance, turn off power at the main
power disconnect switch. Always disconnect main
power prior to performing any service or repairs.
WARNING
Turn off power to the unit unless you are
performing tests that require power. With power
and controls energized, the unit could begin
operating at any time. To prevent personal injury,
stay clear of rotating components as automatic
controls may start them unexpectedly.
4.1.1 Compact CWE Precision A/C Unit
4.1.1.1 Air Filter
The air fi lter is usually the most neglected item in an
air conditioning system. To maintain effi cient opera-
tion, the fi lter should be checked at least monthly and
replaced as required.
NOTE
Conditions of spaces vary and fi lters should be
checked based on those conditions.
4.1.1.2 Fan
Periodic checks of the EC fan system should include
checking the wiring, fan motor mounts, housing and
impeller wheel. Ensure all electrical connections are
tight. Check that all mounts are secure and the im-
peller wheel is tightly mounted. The impeller blades
should be kept free of debris.
4.1.1.3 Drain Pan
To ensure proper drainage, inspect the drain pan regu-
larly. Make sure the drain pan outlets are always free
of debris and ensure the drain pan does not leak.
4.1.1.4 Coils
The coil(s) should be inspected semi annually and
cleaned as required following standard coil cleaning
practices. Using a brush, clean the coil fi ns of all de-
bris that will inhibit airfl ow. This can also be done with
compressed air or with a commercial coil cleaner.
Check for bent or damaged coil fi ns and repair as
necessary. Check all piping for signs of leaks.
4.1.1.5 Heat/Reheat
The heat/reheat equipment should be inspected
semi-annually to ensure it is operational. If you have
electric heat/reheat, inspect the heating elements to
ensure they are free of debris.
4.1.1.6 Humidifi er
The steam cylinder has a limited lifetime and must be
replaced periodically. Because water conditions and
humidifi er usage rates vary greatly, it is diffi cult to es-
tablish intervals for changing the cylinder. Individual
maintenance schedules must be determined for each
location, based upon periodic examination of the
humidifi er. A yellow LED on the humidifi er cabinet
will fl ash four times in a repeating pattern when the
cylinder requires replacement.
