Subject to change without notice. Printed in U.S.A.
035-14396-000 REV B (4/00)
Copyright
©
by Unitary Products Group 2000. All rights reserved.
Supersedes: 035-14396-000 REV A (4/00)
Unitary
5005 Norman
Products
York
OK
Group
Drive
73069
035-14396-000 REV B (4/00)
The filters in your downflow furnace are
located in the plenum or ductwork above the
furnace.To check the filters, turn off the elec-
trical supply to the furnace.
Remove the access cover in the return air
duct above furnace and slide the filter(s) out
of the filter channel. You may need to tilt the
filter in order to clear the vent pipe.
NOTE:The spring-loaded safety cutoff
switch, mounted to the blower deck will
automatically cut off the electrical supply to
the furnace when the blower access door is
removed.
Horizontal Furnaces
Most horizontal furnaces have their filters
located in a 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.
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
The motors in these furnaces are perma-
nently lubricated, and require no periodic oil-
ing.
INSTALLATIO N & M AINTENA NCE
INSTRU CTIO NS
The manufacturer strongly recommends
regular periodic preventative maintenance
on this equipment.
The person most familiar with the equipment
in your system is your dealer. The dealer
can ensure your maintenance program
meets the conditions of the warranty, maxi-
mize the efficiency of the equipment, and
service your unit within the mandated guide-
lines with regard to unlawful discharge of
refrigerants.
The inspection should include heating ele-
ment, vent piping, to see that they are clear
and free of obstructions and without holes or
corrosion. Make sure the horizontal run of
the vent system slopes upward and all of the
connections are secure.
Make sure the return air duct connections
are physically sound and sealed to the fur-
nace casing. Make sure no sagging, cracks,
gaps, etc. exist around the base of the fur-
nace.
Routine periodic maintenance checks
should be done on your furnace at least
every time you check the filters. Proper
burner flame appearance is shown in fig-
ure..
Remove the front panels and turn the knob
on the gas control to the OFF position.
Check the following items:
•
Check for dust and lint on the sensor
and main burners.
•
Check the vent pipe and chimney for
blockage, corrosion or leakage or any
obstructions.
•
Check all components to be sure they
are in good condition and that there
are no obvious signs of deterioration.
If all components appear to be in good oper-
ating condition, turn the gas control to the
ON position. 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 condi-
tions, do not operate the furnace:
•
Excessive amounts of dust and lint on
components.
•
Damaged or deteriorated components
or surfaces.
•
Leaks or blockage in the vent pipe pas-
sages.
Call a certified service contractor to check
your furnace, or for more information if you
have questions about the operation of your
furnace.
Downflow Furnace - Typical Filter
Location
Horizontal Furnace - Typical Filter
Location
VENT PIPE
FURNACE
RETURN
AIR
DUCT
ACCESS
PANEL
FURNACE
RETURN AIR DUCT
Before proceeding, be sure the area is
well ventilated. Turn the thermostat 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.
In order to ensure safe, reliable operation
and long product life, it is recommended
that the entire heating system be
inspected annually by a qualified service
person.
Proper Burner Flame Appearance
S
UGGESTED
H
IGH
V
ELOCITY
F
ILTER
S
IZES
U
P
/H
Z
C
ABINET
S
IZES
F
ILTER
S
IZE
S
IDE
B
OTTOM
(A) 14 1/2
16 x 26
14 x 26
(B) 17 1/2
16 x 26
16 x 26
(C) 21
(2) 16 x 26
20 x 26
(D) 24 1/2
(2) 16 x 26
24 x 26
Downflow
Cabinet Sizes
Filter Size
All Models
(2) 14 x 20
Blue cone portion of flame should enter
heat exchanger tube
