Filters - York 650.75-N4U Installation Instructions Manual

650.75-N4U
Bottom Return
Bottom return applications normally pull return air through a
base platform or return air plenum. Be sure the return platform
structure is suitable to support the weight of the furnace. Be
sure to seal the furnace to plenum connection to prevent air
leakage.
The bottom panel is equipped with a perforated opening for
easy removal. Tabs must be cut with sheet metal snips to allow
removing knock-out. Scribe marks are included for forming
flanges for attachment of the return air ductwork.
NOTE: If an external mounted filter rack is being used, see
the instructions provided with that accessory for proper
hole cut size.
Upflow attic installations must met all minimum clearances to
combustibles and have floor support with required service
accessibility.
DOWNFLOW / HORIZONTAL MODELS -
DOWNFLOW / APPLICATION
DOWNFLOW FILTERS
A top return filter rack is supplied with the
furnace. Two 14" x 20" permanent wash-
able filters are supplied with each unit.
Refer to Downflow Application for details.
Downflow furnaces typically are installed
with the filters located above the furnace,
extending into the return air duct.
Any branch duct must attach to the verti-
cal ductwork above the filter height (FH)
in Figure 4. Refer to dimensions in Figure
4 for proper installation.
FIGURE 4 - DOWNFLOW FILTERS
8
FIGURE 5 - COMBUSTIBLE FLOOR BASE ACCESS'Y
The filter rack (provided) should be secured to the center of the
front and rear flanges at the furnace top. Drill a hole through
the front and rear duct flange into the filter rack and secure it
with a sheet metal screw.
Refer to the unit rating plate for furnace model then see the
dimensions page of this instruction for return air plenum dimen-
sions. Install the plenum following instructions under Ductwork
in this instruction.
SUPPLY AIR DUCTS
Installations on combustible material or floors must use a combus-
tible floor base (shown in Figure 5 - 1CB0314, 17, 21 & 24) as
specified on the rating plate or a matching cooling coil. Follow the
instructions supplied with the combustible floor base accessory.
This base can be replaced with a matching cooling coil, prop-
erly sealed to prevent leaks. Follow the cooling coil instructions
for installing the plenum.
All downflow application supply duct systems must be designed
and installed in accordance with the standards of NFPA 90A
and 90B, and/or all local codes.
DOWNFLOW / HORIZONTAL MODELS -
HORIZONTAL / APPLICATION
HORIZONTAL LEFT OR RIGHT APPLICATION
Downflow furnaces may be installed horizontally with the sup-
ply airflow toward the left or right by laying the unit on the left
or right side panel.
WARNING: Do not install the unit on the rear panel.
Unitary Products Group