Filter
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272442-UUM-B-1211
Unitary Products Group 5
Externally Side Mounted Air Filters
Replace throw away filter(s) with the same size new filter(s). Throw
away filter(s) may be replaced with cleanable filter(s) at this time.
Cleanable filter(s) may be cleaned as described in the manufacturer
instructions or as described in “How to Clean Your Filter”.
This furnace has the filter(s) mounted externally to the cabinet on either
both sides of the cabinet, one side and the bottom of the cabinet, or the
bottom of the cabinet only DO NOT place the air filter(s) on the inside of
the blower compartment on this furnace. The air filter(s) must be placed
in the externally mounted air filter hardware. Follow the instructions
below to remove and replace the air filter(s).
1. Before removing the air filters follow the instructions “To Turn Off
the Appliance” on page 3.
2. Remove the cover on the front of the filter box by removing the
retaining screw or knob that secures the cover to the box. The
external filter box may be located on one side or both sides of the
furnace cabinet. Refer to Figure 9 for filter box locations.
3. Use your fingers to grab the outside edge of the filter and remove
the filter(s) from the filter box.
4. If the filter(s) are permanent cleanable filter(s) follow the instruc-
tions on how to clean your filter or you may replace the throwaway
filter with permanent cleanable filter(s) at this time. Refer to Table
1 for the recommended air filter size.
5. Install the filter(s). The filter(s) should fit in the entire filter track. If
the filter does not fit inside the entire filter track then the filter you
have is the wrong size. Refer to Table 1 for the recommended filter
size.
6. Reinstall the filter box access cover.
7. Follow the Operating Instructions on page 3 to place the furnace
back in service
How to Clean your Filter
High-velocity filters may be cleaned with a vacuum cleaner or washed
with a garden hose. Be sure to shake off excess water and allow filter to
completely dry before re-installing the filter.
Blower Care
Even with good filters properly in place, blower wheels and motors will
become dust laden after long months of operation. The entire blower
assembly should be inspected annually. If the motor and wheel are
heavily coated with dust, they can be brushed and cleaned with a vac-
uum cleaner. If the blower cannot be properly cleaned without removing
it from the furnace, then this service must be performed by a qualified
service agency.
Motor Lubrication
The motors in these furnaces are permanently lubricated, and do not
require periodic oiling.
SECTION II: SERVICE AND MAINTENANCE
MANUAL
SAFETY SECTION
The following safety rules must be followed when servicing the
furnace.
FURNACE MAINTENANCE SECTION
The furnace should be cleaned and adjusted by a certified dealer or
qualified service contractor once a year or before the start of every
heating season. The following items must be cleaned and serviced or
replaced if there are signs of deterioration.
1. The vent terminal screen (if applicable).
2. The furnace vent and combustion air intake passageways. Should
it be necessary to service the vent/air intake system, the manufac-
turer recommends this service be conducted by a qualified service
agency. The operation of this appliance requires the reassembly
and resealing of the vent/air intake system.
3. The furnace burners, igniter and flame sensor.
FIGURE 9: Side Return Filter Rack in the Horizontal Position
TABLE 1:
Air Filter Size
Side Return Bottom/End Return
in. cm in. cm
16 x 25 41 x 63.5 (2)16 x 29 (2)41 x 74
Return air duct(s) may consist of either a bottom return only, or a bottom return
and one side return.
A single side return or a dual-side return IS NOT ALLOWED.
An Accessory External Side Filter Rack and an Accessory External Bottom
Filter Rack are available.
Refer to the accessories section at the back of these instructions for the
Filter Rack part numbers
Make sure you DO NOT move the clip on weight on the
indoor fan wheel when cleaning the wheel. This weight is
used to balance the wheel. Moving the weight will cause
the fan wheel to vibrate.
ELECTRIC SHOCK, FIRE OR EXPLOSION HAZARD
Failure to follow safety warnings exactly could result in
dangerous operation, serious injury, death or property
damage.
Improper servicing could result in dangerous operation,
serious injury, and death or property damage.
• Before servicing, disconnect all electrical power to the fur-
nace.
• When servicing controls, label all wires prior to disconnect-
ing. Reconnect wires correctly.
• Verify proper operation after servicing.