Clearances To Combustibles; Below Freezing Locations - York P*UR 40 Installation Instructions Manual

035-14370-000
Furnaces shall not be installed directly on carpet-
ing, tile or other combustible material other than
wood flooring. An accessory combustible floor
base is available to allow direct installation of
downflow models on combustible flooring.
Furnace shall be installed so the electrical compo-
nents are protected from water.
The size of the unit should be based on an acceptable heat
loss calculation for the structure.
Check the rating plate to make certain the unit is equipped for
the type of gas supplied, and proper electrical characteristics
are available.
For installations above 2,000 feet, reduce input 4% for each
1,000 feet above sea level. Refer to Form 650.75-N2.1V for
correct pressure switch/orifice or other required conversion
information.
A furnace installed in a residential garage shall be located so
that all burners and burner ignition devices are located not
less that 18" above the garage floor, and located or protected
to prevent damage by vehicles.
Allow clearances from combustible materials as listed under
Clearances to Combustibles, ensuring that service access is
allowed for both the burners and blower.
When the furnace is used in conjunction with a cooling coil,
the furnace must be installed parallel with or on the upstream
side of the cooling unit to avoid condensation in the primary
heat exchanger.
When a parallel flow arrangement is used, the dampers or
other means used to control air flow shall be adequate to pre-
Unitary Products Group
vent chilled air from entering the furnace, and if manually
operated, must be equipped with means to prevent operation
of either unit unless the damper is in the full heat or cool posi-
tion.
The furnace shall be located:
1. Where a minimum amount of air intake/vent piping and
elbows will be required.
2. As centralized with the air distribution as possible.
3. In an area where ventilation facilities provide for safe lim-
its of ambient temperature under normal operating con-
ditions. Ambient temperatures must not fall below 32°F
(0°C).
4. Where it will not interfere with proper air circulation in the
confined space.
5. Where the outdoor combustion air/vent terminal will not
be blocked or restricted.
6. Where it will not interfere with the cleaning, servicing or
removal of other appliances.

CLEARANCES TO COMBUSTIBLES

Minimum clearances from combustible construction are
shown in Table 3, "UNIT CLEARANCES TO COMBUSTI-
BLES," on page 8.

BELOW FREEZING LOCATIONS

If this furnace is installed in any area where the ambient tem-
perature may drop below 32° F, a UL listed self regulated
heat tape must be installed. It is recommended that self regu-
lating heat tape rated at 3 watts per foot be used. This must
be installed around the condensate drain lines in the uncondi-
tioned space. Always install the heat tape per the manufac-
turer's instructions. Cover the self-regulating heat tape with
fiberglass or other heat resistant, insulating material.
650.75-N4U
5