25
Valves and piping
No formal maintenance is required
on the valve package components
other than a visual inspection
for possible leaks during normal
periodic unit maintenance. Strainers,
when included, should be checked
regularly for build-up and rinsed as
needed. In the event that a valve
should need replacement, the same
precautions taken during the initial
installation to protect the valve
package from excessive heat should
be implemented during replacement.
Throwaway filters
These types of filters should be
replaced on a regular basis. The
time interval between replacement
is dependent upon the environment
in which the unit is operating and
should be set established based
on regular inspection of the filter.
Record the time interval in the
maintenance log for future reference.
Refer to the product catalog for
the recommended filter size. If the
replacement filters are not purchased
from the factory, the same type
and size filters should be obtained.
Pleated media or extended surface
filters should not be used without
consent from the factory due to the
high air pressure drops associated
with these types of filters, negatively
affecting unit performance.
Cleanable filters
Cleanable filters should be
inspected and cleaned on a
regular basis, similar to the
maintenance schedule used
for throwaway filters. The time
interval between cleaning is
dependent upon the environment
in which the unit is operating and
should be established based
upon regular inspection of the
filter. Record the time interval in
the maintenance log for future
reference. Unlike throwaway
filters, cleanable filters may be
cleaned and reinstalled in the
unit instead of being disposed
of when dirty. The cleanable
filters may be washed in hot,
soapy water and then set aside
to dry before recharging and
reinstalling.
Before replacing the filter, it
should be recharged with some
type of entrapment film such as
“Film-Car Recharging Oil.” The
filter should be sprayed on both
sides or submerged in the film to
assure complete coverage. The
filter should not be soaked in the
film but should be quickly dunked
and removed, allowing the excess
to drain off the surface before
reinstalling in the unit.
Note: cleanable filters tend to
have less air pressure drop than
throwaway filters.
Electrical wiring & controls
Electrical operation of each unit
is determined by the components
and wiring of the unit. 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 the actual type and number of
controls provided on each unit.
The integrity of all electrical
connections should be verified
at least twice during the first
year of operation. Afterwards,
all controls should be inspected
regularly for proper operation.
Some components may
experience erratic operation or
failure due to age. Thermostats
may become clogged with dust/
lint, and should be periodically
inspected and cleaned to provide
reliable operation.
When replacing any electrical
components such as fuses,
contactors, relays or transformers,
use only the exact type, size
and voltage component as
furnished from the factory. Any
deviation from this could result
in personnel injury or damage
to the unit and will void the
manufacturer’s warranty. All
repair work should be done in
such a way as to maintain the
equipment in compliance with
governing local and national
codes, ordinances and safety
testing agency listings.
Normal operation and maintenance
