Specifications

28
8.0 REGULAR MAINTENANCE ITEMS
8.1 Filters
Filters should be checked on a regular basis and changed when they become dirty. This will
ensure effi cient operation of the unit. Although the unit has a dirty fi lter alarm, this should not be
relied on as the only determinant for replacing fi lters. A maladjusted fi lter differential pressure switch
may not give a proper indication of a clogged fi lter.
To check the 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. Doors must remain closed when determining
if an adjustment is necessary.
Spare fi lters should be kept in stock as these tend to be a frequently replaced maintenance item.
Filters may require changing as often as monthly. Note also that construction dust on new installations
will quickly clog new fi lters.
Filters 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 also occur to belts that are overtightened. The amount of play in a typical drive set should be
1/2 inch.
8.3 Bearings
Pillow block bearings used on many models have zerk type grease fi ttings. These will require
grease 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. All other blower
bearings are permanently lubricated and do not require maintenance.
On units having sealed type ball bearings with clamps on collars or retaining rings, proper torque
for collar or retaining rings is 65-70 in-lbs. Ensure that collars or retaining rings are perpendicular
to the shaft, if they are not perpendicular damage to the blower shaft will occur.
Most blower motors have sealed bearings and are maintenance free. Some motors have zirk
type grease fi ttings on the bearings. If so the motor should be greased once annually. Care should
be taken to avoid over-greasing. Only one or two pumps from a manual gun are required.
8.4 Humidifi er Canisters
Steam generator type humidifi er is standard on Data Aire Series equipment. There is no
maintenance required 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.