27
Filters
CAUTION
To prevent property damage due to fire and loss
of equipment efficiency or equipment damage due
to dust and lint build up on internal parts, never
operate unit without an air filter installed in the
return air system.
Every application may require a different frequency of
replacement of dirty filters. Filters must be replaced at least
every three (3) months during operating seasons.
Dirty filters are the most common cause of inadequate
heating or cooling performance. Filter inspection should be
made at least every two months; more often if necessary
because of local conditions and usage.
Dirty throwaway filters should be discarded and replaced
with a new, clean filter.
Disposable return air filters are supplied with this unit. See
the unit Specification Sheet or Technical Manual for the
correct size and part number. To remove the filters, remove
the filter access panel on return side of the unit.
Cabinet Finish Maintenance
Use a fine grade automotive wax on the cabinet finish to
maintain the finish’s original high luster. This is especially
important in installations with extended periods of direct
sunlight.
Clean Outside Coil
The coil with the outside air flowing over it should be
inspected annually and cleaned as frequently as necessary
to keep the finned areas free of lint, hair and debris. Clean
coil from inside out.
Condenser And Induced Draft Motors
Bearings on the condenser fan motors and the combustion
fan motor are permanently lubricated. No additional oiling
is required.
Flame Sensor
A drop in the flame current can be caused by a nearly
invisible coating on the flame sensor. This coating, created
by the fuel or combustion air supply, can be removed by
carefully cleaning the flame sensor with steel wool.
NOTE: After cleaning, the microamp signal should
be stable and in the range of 4 - 6 microamps DC.
Flue Passages
At the start of each heating season, inspect and, if
necessary, clean the unit flue passage.
WARNING
HIGH VOLTAGE!
Disconnect all power before
servicing or installing this unit.
Multiple power sources may be
present. Failure to do so may cause
property damage, personal injury or
death.
WARNING
To prevent personal injury or death due to
improper installation, adjustment, alteration,
service or maintenance, refer to this manual.
For additional assistance or information,
consult a qualified installer, servicer agency or
the gas supplier.
CAUTION
Sheet metal parts, screws, clips and similar
items inherently have sharp edges, and it
is necessary that the installer and service
personnel exercise caution.
Preventive maintenance is the best way to avoid
unnecessary expense and inconvenience. Have this
system inspected at regular intervals by qualified service
personnel, at least twice a year. Routine maintenance
should cover the following items:
1. Tighten all set screws, and wire connections.
2. Clean evaporator and condenser coils mechanically
or with cold water, if necessary. Usually any fouling
is only matted on the entering air face of the coil and
can be removed by brushing.
3.
Replace filters as needed (see Filters section).
4. Check for blockage of condensate drain.
5. Check power and control voltages.
6. Check running amperage.
7. Check operating temperatures and pressures.
8. Check and adjust temperature and pressure controls.
9. Check and adjust damper linkages.
10. Check operation of all safety controls.
11. Examine gas furnaces (see below and the User’s
Information Manual).
12. Check condenser fans and tighten set screws.
