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Maintenance
Air Filters
Air filters are usually the most neglected item in an air
conditioning system. To maintain efficient operation, the
filters may require inspection monthly. Replace them as
required.
Note: Conditions of spaces vary and the frequency of
checking air filters should be based on those
conditions.
Blower
The blower motor is provided with permanently lubricated
bearings and should not require lubrication for the lifetime
of the unit. Periodic checks of the blower system should
include checking the wiring, blower motor mounts,
housing bolts and blower wheel set screw. Ensure all
electrical connections are tight. Check that all mounts are
secure and the blower wheel is tightly mounted on the
shaft and does not rub against the fan housing. The blower
vanes should be kept free of debris. Inspect motor pulleys
and sheaves for excessive grooves. Inspect bearings for
excessive wear. Inspect blower section for any loose parts
or debris.
Coils
The coil(s) should be cleaned as required following
standard coil cleaning practices. Using a brush, clean fluid
coil fins of all debris that will inhibit airflow. This can also
be done with compressed air or with a commercial coil
cleaner. Check for bent or damaged coil fins and repair as
necessary. Check all refrigerant lines and capillaries for
vibration isolation and support if necessary. Check all
piping for signs of leaks.
Inspect electric heating elements to ensure they are free of
debris.
Drain Pan
To assure proper drainage, inspect the drain pan regularly.
Make sure the drain pan outlet is always free of debris and
ensure the drain pan does not leak. Check the drain pan
float switch to verify it is free to move.
Condensate Pump
The optional condensate pump should be inspected semi-
annually and cleaned. Ensure that the float works freely.
Wipe the float with a wet cloth and detergent to remove
dirt. Clean the tank bottom. Check that the discharge line is
open and water can pass through it freely.
Humidifier
The optional humidifier's steam cylinder has a limited
lifetime and must be replaced periodically. Because water
conditions and humidifier usage rates vary greatly, it is
difficult to establish intervals for changing the cylinder.
Individual maintenance schedules must be determined for
each location based upon periodic examination of the
humidifier. A yellow LED on the humidifier cabinet
40
repeatedly flashes four times to indicate the cylinder
should be replaced.
Note: The yellow LED may illuminate during initial start-
up but it doesn't necessarily mean the cylinder
needs to be replaced.
Refer to the humidifer operator's manual supplied under
separate cover for detailed instructions for changing the
cylinder.
Also, perform the maintenance operations described in
the humidifier manual.
Condenser/Condensing Unit
Maintenance access to the condensing unit is through one
or two removable panels (depending on model). Clean the
air-cooled condenser coil of all debris that will inhibit air-
flow. This can be done with compressed air or with a
commercial coil cleaner. Check for bent or damaged coil
fins and repair as necessary. On outdoor units in winter, do
not permit snow to accumulate on or around the
condensing unit. Check all refrigerant lines and capillaries
for vibration isolation and support as necessary. Check all
refrigerant and coolant lines for signs of leaks.
Important:
If main power is disconnected for a long
period, do not attempt to start a condensing
unit until eight hours after applying power.
This allows time for all liquid refrigerant to
be driven out of the compressor. This is
especially important at low ambient
temperature conditions.
AH-SVX008C-EN
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