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035-14379-000 REV C (900)
Downflow/Horizontal Models
The filters in your downflow/horizontal fur-
nace are located in the plenum or ductwork
above the furnace.To check the filters, turn
off the electrical supply to the furnace. Then
remove the access panel and lift the filter(s)
off the rack.
NOTE:The
spring-loaded
safety
switch, mounted to the blower deck will
automatically cut off the electrical supply to
the furnace when the blower access door is
removed.
RETURN
AIR
DUCT
ACCESS
PANEL
FURNACE
Downflow Furnace - Typical Filter
Location
Horizontal Furnaces
Most horizontal furnaces have their filters
located ina filter grille(s) so that it may be
easily changed without gaining access to
the attic or crawl space.
Some installations may have a filter rack
near the furnace. With this type of acces-
sory, unsnap the filter rack door and pull.
The filter is attached to the door and will
slide out. If you are unsure where the fur-
nace filter is installed, check with the
installer.
FURNACE
RETURN AIR DUCT
Horizontal Furnace - Typical Filter
Location
Subject to change without notice. Printed in U.S.A.
Copyright © by Unitary Products Group 2000. All rights reserved.
Unitary
Products
Group
HOW TO CLEAN YOUR
FURNACE'S FILTER
High-velocity filters may be cleaned with a
vacuum cleaner or washed with a garden
hose. Be sure to shake off excess water
before re-installing the filter.
MOTOR LUBRICATION
cutoff
The motors in these furnaces are perma-
nently lubricated, and require no periodic oil-
ing.
INSTALLATION & MAINTENANCE
INSTRUCTIONS
VENT PIPE
It is the owner's responsibility to ensure that
an annual inspection of the entire heating
portion of the unit is made by a qualified ser-
vice agency.
The inspection should include heating ele-
ment, vent/combustion air piping, to see that
they are clear and free of obstructions and
without holes or corrosion.
Make sure the horizontal run of the vent sys-
tem slopes upward and all of the connec-
tions are secure.
Make sure the return air duct connections
are physically sound and sealed to the fur-
nace casing and terminates outside the
space containing the furnace. Make sure no
sagging, cracks, gaps, etc. exist around the
base of the furnace.
Check the main burner flames for proper
adjustment per the illustration below:
COMBUSTION AIR
INTAKE
MAIN
MANIFOLD
BURNER
Proper Burner Flame Appearance
Routine
periodic
should be done on your furnace at least
every time you check the filters.
Remove the front panels and the panel on
the front of the burner box after turning the
knob on the gas control to the OFF position.
Check the following items:
•
•
•
If all components appear to be in good oper-
ating condition, turn the gas control to the
ON position after replacing the front panel of
the burner box. Replace the front panels.
Restore gas and power supplies to the fur-
nace, and set thermostat to the desired tem-
perature.
If, during your inspection of your furnace,
you find any of the following conditions, do
not operate the furnace:
•
•
•
Call a certified dealer/servicing contractor to
BURNER
check your furnace, or for more information
FLAME
if you have questions about the operation of
your furnace.
FILTER SIZES
UPFLOW MODELS
INNER
FLAME
CONES
maintenance
checks
Supersedes: 035-14379-000 REV B (900)
5005
York
Drive
Before proceeding, be sure the area
is well ventilated. Turn the thermo-
stat OFF. If the blower is running,
wait until it stops automatically. Turn
OFF the gas and electrical power
supplies to the furnace. Check all
metal parts and surfaces to be sure
they have cooled to room tempera-
ture before you begin.
Check for dust and lint on the sensor
and main burners.
Check combustion air and vent pipe for
blockage, corrosion or leakage.
Check all components to be sure they
are in good condition and that there are
no obvious signs of deterioration.
Excessive amounts of dust and lint on
components.
Damaged or deteriorated components or
surfaces.
Leaks or blockage in the vent pipe pas-
sages.
SIDE
BOTTOM
40/37/1000/A
16 x 25
60/55/1000/B
16 x 25
80/75/1200/B
16 x 25
80/75/1600/C
16 x 25
100/95/1400/C
16 x 25
100/95/2000/C
(2) 16 x 25
120/112/2000/D
(2) 16 x 25
140/130/2000/D
(2) 16 x 25
DOWNFLOW /
HORIZONTAL
FILTER SIZE
MODELS
All Models
(2) 14 x 25
035-14379-000 REV C (900)
14 x 25
16 x 25
16 x 25
20 x 25
20 x 25
20 x 25
22 x 25
22 x 25
Norman
OK
73069
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