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Normal operation and
periodic maintenance
24
General
Each unit on a project will
have its own unique operating
environment and conditions
which dictate a maintenance
schedule for that unit that
may be different from other
equipment on the project. A
formal regular maintenance
schedule and an individual
unit log should be established
and maintained. Following this
schedule will help maximize the
performance and service life of
each unit on the project.
The safety considerations listed
in the front of this manual should
be followed during any service
and maintenance operations.
For more detailed service
information consult your Sales
Representative or the factory.
Disconnect power supply from
the unit before servicing.
Motor/blower assembly
The type of fan operation is
determined by the control
components and their method of
wiring. This may vary from unit to
unit. Refer to the wiring diagram
located in a zip-lock plastic bag
in the electrical end pocket of
each unit for that unit's individual
operating characteristics.
All motors have permanently
lubricated bearings so no further
field lubrication is ever required.
If the motor/blower assembly
ever requires more extensive
service such as motor or blower
wheel/housing replacement, the
entire assembly can be removed
from the unit.
Dirt and dust should not be
allowed to accumulate on
the blower wheel or housing.
Failure to keep this clean may
result in an unbalanced wheel
condition which can lead to a
damaged blower wheel or motor.
The wheel and housing may
be cleaned periodically using
a brush and vacuum cleaner,
taking care not to dislodge
the factory applied balancing
weights on the blower wheel
blades. Clean the blower at every
inspection. Any blower or motor
that is not properly maintained
will not be covered under the
manufacturer's warranty.
Coil
Coils may be cleaned by
removing the motor/blower
assembly, providing access
to the air entry side of the
coil. Brush the entire finned
surface with a soft bristled
brush, brushing parallel to the
fins, taking care not to damage
the fins. Brushing should be
followed by cleaning with a
vacuum cleaner. Compressed
air can also be used by blowing
air through the coil fins from the
leaving air side, again followed by
vacuuming. If fins are damaged
during the cleaning process, a
12 fins per inch fin comb can be
used to straighten the fins. For a
deeper cleaning, spray the finned
surface with a mild alkali cleaning
solution and rinse thoroughly.
Failure to maintain a clean coil
surface will result in reduced
airflow, reduced performance
and increased power
consumption. Clean the coil at
every inspection. Units provided
with the proper type of air filters,
replaced regularly, will require
less frequent coil cleaning.
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