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8.0 REGULAR MAINTENANCE ITEMS
8.1 Air Filters
Air fi lters should be checked on a regular basis and changed when they become dirty. This will
ensure effi cient operation of the unit. Spare air fi lters should be kept in stock as these tend to be a
frequently replaced maintenance item. Air fi lters may require changing as often as monthly. Note
also that construction dust on new installations will quickly clog new fi lters.
The Mini DAP II control panel can monitor air fi lters with an optional dirty air fi lter alarm. Although the
unit may have a dirty fi lter alarm, this should not be relied on as the only determinant for replacing
air fi lters. A mis-adjusted air fi lter differential pressure switch may not give a proper indication of a
clogged air fi lter.
To check the air fi lter differential pressure switch for proper adjustment, temporarily cover about 75%
of the return air opening using heavy cardboard or similar material. The alarm should energize when
75% of the air is blocked, simulating dirty fi lters. If the alarm energizes prematurely or does not
energize at all, the pressure switch should be adjusted. Panels must remain closed when determining
if an adjustment is necessary.
Air fi lters that require changing can restrict airfl ow and create problems such as coil
icing or poor air distribution.
8.2 Belts
Belt tension should be checked regularly (monthly) to ensure proper tension. If tightening is required,
loosen the four motor mounting bolts. Turn the adjustment screw on the end of the motor mounting
channel until the proper belt tension is attained. Retighten the four mounting bolts. Damage can
occur to belts that are overtightened. The amount of play in a typical driveset should be 1/2 inch.
When tightening the belts make sure the pulley alignment is true. If the belts are over tightened or
if the pulleys are misaligned the bearing and belt life can be signifi cantly shortened.
8.3 Bearings
LCS units with either one (1) and two (2) HP motors have permanent lubricated bearings. Motors of
three (3) HP and above have a pillow block bearing that must be greased quarterly, or as needed.
Some motors have zirk type grease fi ttings on the bearings. If so the motor should be greased at
least annually. Use NLGI grade 2 lithium or lithium complex grease. Care should be taken to avoid
over-greasing. Only one or two pumps from a manual gun are required.
8.4 Humidifi er Canisters
The optional steam generator type humidifi er does not require maintenance other than to replace the
canister as required. This frequency will depend on usage and water type. A set of manufacturer’s
instructions for the humidifi er is sent as part of the paperwork placed inside the unit when it ships.
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