506941-01
Page 3 of 16
Issue 1148
Clearances
All units require certain clearances for proper operation
and service.
•
Refer to Figure 2 standard installation clearances
for servicing, and proper unit operation.
•
Refer to Figure 3 for the clearances required for
combustible
contstruction.
Do not permit overhanging structures or shrubs to
obstruct condenser air discharge outlet, combustion
air inlet, or vent outlet.
In the U.S.A., units may be installed on combustible fl oors
made from wood or class A, B, or C roof covering material.
In Canada, units may be installed on combustible fl oors.
Units must be installed outdoors.
Service Access
Access to all serviceable components is provided by four
(4) removable panels: blower compartment, evoporator
coil/fi lter compartment, burner compartment, and main
control box.
Combustion Discharge
The vent outlet must be installed in a location as to prevent
building degradation and must be consistent with the
National Fuel Gas Code, Z223.1 or CAN/CGA-B149.1 & .2.
Roof Curb Installation
If a roof curb is used, follow the manufacturer’s Installation
Instructions and be sure that all required clearances are
observed (see Clearances section on this page).
This unit is shipped with four (4) corner brackets in place
on the underside of the unit (see Figure 1).
All four (4)
brackets must be removed before unit is installed onto
roof curb assembly.
To avoid interference with roof curb remove the outer most
screw attaching the outdoor coil fi ller panel to the unit base,
and caulk the open hole.
The products of combustion are discharged through
a screened opening on the gas heat side panel. The
horizontal vent system shall terminate at least 4’ (ft.) below,
4’ (ft.) horizontally from, or 1’ (ft.) above any door, window,
or gravity air inlet into the building. The vent system shall
terminate at least 3’ (ft.) above any forced air inlet located
within 10’ (ft.).
The unit shall be installed in a manner such that snow
accumulation will
NOT
restrict the fl ow of fl ue products.
Figure 2
Minimum Installation Clearances
Inches (mm)
Corner Brackets
Figure 1
Coil Close
Off
Bracket
Bracket
Bracket
Bracket
Remove all four (4) corner brackets before installing on roof curb.
Return
Supply
Figure 3
Minimum Clearances to Combustibles
Inches (mm)
