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Installation and Maintenance 61
Cartridge or Bag Filters
To install cartridge or bag filters, complete the
following:
WARNING
Disconnect electrical power
source, and allow all rotating
equipment to stop before inspect-
ing or servicing the unit. Failure to
do so may result in personal injury
or death from electrical shock or
rotating parts.
1 Open the filter section access door and remove
the filters and block-offs from their installed
position.
2 Keeping the bag filters folded, slide each filter into
the filter rack, pushing them tightly against the
unit. Pleats should be in the vertical position.
3 If using the optional pre-filters, slide them into the
appropriate filter rack.
4 If fixed and adjustable block-offs are provided with
the unit, slide the fixed block-offs into the filter
track before the adjustable block-off. The
adjustable block-off should always be installed
last, next to the access door.
5 Close and secure the access door. If the door can
be closed without compressing the filter, adjust
the block-off by loosening its screws and position
it to provide an airtight seal.
Fans
Inspecting and Cleaning Fans
Fan sections of air handlers should be inspected
every six months at a minimum or more frequently if
operating experience dictates. Accumulated dirt and
organic matter on the interior surfaces of fans should
be cleaned immediately. The suggested procedure
for cleaning these surfaces is:
1 Disconnect all electrical power to the unit.
2 Don the appropriate personal protective
equipment (PPE).
3 Use a portable vacuum with HEPA filtration to
remove the loose dirt and organic matter. The
filter should be 99.97% efficient at 0.3 micron
particle size.
4 If no microbial growth (mold) exists, thoroughly
clean the fan and associated components with an
industrial cleaning solution. Carefully follow the
cleaning solution manufacturers instructions
regarding use of their product.
5 If microbial growth (mold) is present, remove the
contamination (Step 2) and thoroughly clean the
affected area with an EPA-approved sanitizer
specifically designed for HVAC use. Carefully
follow the sanitizer manufacturers instructions
regarding the use of the product.
6 Rinse the affected surfaces thoroughly with fresh
water and a fresh sponge to prevent potential
corrosion of metal surfaces.
7 Allow the unit to dry completely before putting it
back into service.
8 Use caution to assure that any contaminated
material does not contact other areas of the unit
or building. Properly dispose of all
contaminated materials and cleaning solution
.
IMPORTANT: IF MICROBIAL GROWTH (MOLD) WAS
FOUND, THE CAUSE OF THE CONTAMINATION MUST
BE DETERMINED AND ACTION TAKEN TO ASSURE IT
DOES NOT RECUR.
Fan Bearings and Motors
Bearing Set screw Alignment
Align bearing set screws as illustrated in
Figure 50
.
Reference
Table 45
for bearing set screw torque.