Filter
Top Products
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 fil-
ters located in a filter grille(s) so that it
may be easily changed without gaining
access to the attic or crawlspace.
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
furnace 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 gar-
den 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 peri-
odic oiling.
INSTALLATION AND
MAINTENANCE
INSTRUCTIONS
YORK strongly recommends regular pe-
riodic preventative maintenance on this
equipment.
The person most familiar with the equip-
ment in your system is a YORK dealer.
The YORK dealer can ensure your main-
tenance program meets the conditions
of the "YORK Warranty", maximize the
efficiency of the equipment, and service
your unit within the mandated guidelines
with regard to unlawful discharge of re-
frigerants.
The inspection should include heating
element, vent piping, to see that they are
clear and free of obstructions and with-
out 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 furnace casing. Make sure
no sagging, cracks, gaps, etc. exist
around the base of the furnace.
Routine periodic maintenance checks
should be done on your furnace at least
every time you check the filters. Proper
burner flame appearance is shown below.
CAUTION: Before proceeding,
be sure the area is well venti-
lated. Turn the thermostat OFF. If
the blower is running, wait until it
stops automatically. Turn OFF
the gas and electrical power sup-
plies to the furnace. Check all
metal parts and surfaces to be
sure they have cooled to room
temperature before you begin.
Remove the front panels and turn the
knob on the gas control to the OFF po-
sition. 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
operating condition, turn the gas control
to the ON position. Replace the front
panels. Restore gas and power supplies
to the furnace, and set thermostat to the
desired temperature.
If, during your inspection of your furnace,
you find any of the following conditions, do
not operate the furnace:
• Excessive amounts of dust and lint
on components.
• Damaged or deteriorated compo-
nents or surfaces.
• Leaks or blockage in the vent pipe
passages.
Call a certified servicing contractor to
check your furnace, or for more informa-
tion if you have questions about the op-
eration of your furnace.
SUGGESTED HIGH VELOCITY
FILTER SIZES
UPFLOW
MODELS
FILTER SIZE
Side Bottom
P3HUA08N03201 16 x 26 14 x 26
P3HUA12N03201 16 x 26 14 x 26
P3HUA08N04801 16 x 26 14 x 26
P3HUA12N04801 16 x 26 14 x 26
P3HUA12N06401 16 x 26 14 x 26
P3HUB16N06401 16 x 26 16 x 26
P3HUC20N06401 (2) 16 x 26 20 x 26
P3HUB12N08001 16 x 26 16 x 26
P3HUB16N08001 16 x 26 16 x 26
P3HUC20N08001 (2) 16 x 26 20 x 26
P3HUC16N09201 16 x 26 20 x 26
P3HUC20N09201 (2) 16 x 26 20 x 26
P3HUD20N10401 (2) 16 x 26 24 x 26
DOWNFLOW
MODELS
FILTER SIZE
P3DNA08N03201 (2) 14 x 20
P3DNA08N04801 (2) 14 x 20
P3DNA12N04801 (2) 14 x 20
P3DNA12N06401 (2) 14 x 20
P3DNB16N06401 (2) 14 x 20
P3DNB12N08001 (2) 14 x 20
P3DNC20N08001 (2) 14 x 20
P3DNC16N09201 (2) 14 x 20
P3DNC20N09201 (2) 14 x 20
P3DND20N10401 (2) 14 x 20
* Eighth place model designator may be "N"
for standard units or "L" for factory built
Lo NOx units.
FURNACE
RETURN AIR DUCT
HORIZONTAL FURNACE
TYPICAL FILTER LOCATION
BLUE CONE PORTION OF
FLAME SHOULD ENTER HEAT
EXCHANGER TUBE
PROPER BURNER FLAME
APPEARANCE
Unitary Products Group
P.O. Box 1592, York, Pennsylvania USA 17405-1592
Subject to change without notice. Printed in U.S.A.
Copyright by York International Corporation 1997. All Rights Reserved.
Code: EBY, EGY
650.74-O1Y (297)
In order to ensure safe, reliable opera-
tion and long product life, it is recom-
mended that the entire heating system
be inspected annually by a qualified
service person.