Internal Filter Maintenance
The unit will typically be provided with 2-inch
thick pleated paper filters in the airstream. These
filters should be checked according to a routine
maintenance schedule and replaced as necessary
to ensure proper airflow through the unit. See table
below for pleated paper filter size and quantity for
each unit. Replacement filters shall be of same
performance and quality as factory installed filters.
Filter must be pleated design with integral metal
grid. Two acceptable filter replacements are Aerostat
Series 400 or Farr 30/30
®
.
The standard 2-inch thick pleated paper filter is rated
at MERV 8, but 2-inch thick MERV 13 filters can be
substituted, if desired.
Filter Size (Quantities)
Model
2-inch
aluminum mesh
(weatherhood)
2- and 4-inch
pleated filters
MPX-H14
20 x 25 (2)
20 x 25 (2)
MPX-H24
16 x 25 (4)
20 x 25 (4)
MPX-H34
20 x 25 (4)
16 x 25 (6)
WARNING
REFER TO GENERAL SAFETY INFORMATION
Do not operate this unit without the filters and
birdscreen installed. They prevent the entry of
foreign objects such as leaves, birds, etc.
Do not remove access panels or other unit
components while standing on a ladder or other
unsteady base. Access panels and unit components
are heavy and serious injury may occur.
Coil Maintenance
Coils must be cleaned to maintain maximum
performance. Check coils once per year under normal
operating conditions and if dirty, brush or vacuum
clean. Soiled fins reduce the capacity of the coil,
demand more energy from the fan and create an
environment for odor and bacteria to grow and spread
through the conditioned zone. High pressure water
(700 psi or less) may be used to clean coils with a
fin thickness over 0.0095 inches thick. TEST THE
SPRAY PRESSURE over a small corner of the coil to
determine if the fins will withstand the spray pressure.
For coils with fragile fins or high fin density, foaming
chemical sprays and washes are available. Many coil
cleaners use harsh chemicals, so they must be used
with caution by qualified personnel only. Care must be
taken not to damage the coils, including the fins, while
cleaning.
Caution: Fin edges are sharp!
Drain pans in any air conditioning unit will have
some moisture in them, therefore, algae and other
organisms will grow due to airborne spores and
bacteria. Periodic cleaning is necessary to prevent
this buildup from plugging the drain and causing the
drain pan to overflow. Inspect twice a year to avoid
the possibility of overflow. Also, drain pans should be
kept clean to prevent the spread of disease. Cleaning
should be performed by qualified personnel.
External Filter Maintenance
Aluminum mesh, 2-inch thick
filters are located in the supply
weatherhood (if the weatherhood
option was purchased). These
filters should be checked and
cleaned on a regular basis for
best efficiency. The frequency
of cleaning depends upon the
cleanliness of the incoming air.
These filters should be cleaned by rinsing with a mild
detergent in warm water prior to start-up.
Filter
Outdoor Air Intake Hood
Mesh Filter Access
Outdoor Air Filters:
Access to the outdoor air filters is
through the door labeled “Filter Access” on the access side
of the unit.
Refer to Access Door Descriptions section of this manual for
additional information on filter locations and access.
WARNING
Biological hazard. May cause disease. Cleaning
should be performed by qualified personnel.
38
Model MPX Make-Up Air Unit
Model XMPX Make-Up Air Unit
