
Modular Hi-Rise Replacement Series – MIY
INSTALLATION, OPERATION, & MAINTENANCE MANUAL
23
SECTION FIVE — Routine Maintenance, Cont’d.
Filters, Throwaway (including MERV)
The throwaway filter should be replaced on a regular
basis. The time interval between each replacement should
be established based on regular inspection of the filter
and should be recorded in the log for each unit. Refer to
the product catalog for the recommended filter size for
each product type and size. If the replacement filters are
not purchased from the factory, the filters used should
be the same type and size as those furnished from or
recommended by the factory. Consult the factory for
applications using filter types other than the factory
standard or optional product. When a filter with a higher
level of filtration is used, the more frequently that filter
needs to be changed to maintain performance.
Filters, Permanent
A maintenance schedule for permanent filters should
be developed in the same manner as throwaway filters.
Unlike throwaway filters, permanent filters may be
cleaned and re-installed in the unit instead of being
discarded when dirty. The optional factory permanent
filter may be cleaned in hot soapy water to remove any
trapped dirt. It should then be set aside on edge to dry.
Before replacing the filter in the unit, it should be
recharged with some type of entrapment film such as
“Film-Cor Recharging Oil.” The filter should be sprayed on
both sides or submerged in the film to assure complete
coverage. The filter should not be allowed to soak in the
film, but should be immediately removed and the excess
film drained from the filter before re-installation in the unit.
Consult a local filter supplier for types of available cleaning
solutions and charging films.
It should be noted that permanent filters normally have
less static pressure loss than throwaway filters.
Drain
The drain should be checked before initial start-up and at
the beginning of each cooling season to assure that the
drain trap and riser are clear. If it is clogged, steps should
be taken to clear the debris so that condensate will flow
easily.
Periodic checks of the drain should be made during the
cooling season to maintain a free-flowing condensate.
Should the growth of algae and/or bacteria be a concern,
consult a HVAC supply organization familiar with local
conditions, for chemicals or other solutions available to
control these agents.