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All installations and services must be performed by qualified service personnel.
The minimum clearances from furnace to combustible
materials
MODELS:
GMA1-60D48N
GMA1-75D48N
GMC1-60D48N
GMC1-75D48N
FRONT
BACK
SIDES
ROOF JACK
TOP
PLENUM SIDES
TOP & SIDES OF DUCT
BOTTOM OF DUCT
COMBUSTION AIR
This furnace is a direct vent unit; it is designed to be
used only with the approved roof jacks listed in Table 2
below. These roof jacks are designed to provide
combustion air to the furnaces and exhaust flue gases to
the outside. No other combustion air openings are
needed.
Chloride, fluoride, iodide, and bromide bearing
compounds when present in the combustion air supplied
to the furnace, even in low concentrations, can result in
accelerated and severe corrosion of the heat exchanger
and/or the venting system. Avoid storing or using these
chemicals within close proximity to the furnace. In
addition, avoid storing or using any chemicals, of an
unknown and possibly flammable nature, in close
proximity to the furnace.
FURNACE LOCATION
c CAUTION: DO NOT connect a ducted return air
system directly to the furnace. Improper installation may
create a fire hazard and damage internal equipment, as
well as void all manufacturers' warranties.
For best performance, locate the furnace so that it is
centralized with respect to the duct system.
These furnaces are only intended for installation with
free air return through the furnace door louvers.
The GMA1 & GMC1 series furnaces may be installed on
combustible flooring when utilizing the DC-BASE
Combustible Floor Base. The GMA1 series may be
installed on the CE118S Coil Cabinet. See Figures 1 and
2 for depictions of the DC-BASE and the CE118S.
These furnaces are approved to be installed on DC-
BASE, 79990-60**, 7990-62** and 7990-6301 series
Duct Connectors.
These furnaces are listed for closet or alcove
applications. All applications must comply with the
requirements of this manual.
Furnace and Air Conditioning installations
When used in conjunction with a cooling unit the furnace
must be installed on the upstream side of the evaporator
coil to avoid condensation in the heat exchanger. If a
Self-contained AC system is connected to the same
Distribution Duct as the furnace or the furnace is
CLOSET
ALCOVE
(IN.)
(IN.)
6
18
0
0
0
0
0
0
2
2
1/4
1/4
1
1
1
1
TABLE 1
installed parallel to the evaporator coil a damper must be
installed at the furnace base to prevent cold air from
being discharged up around the heat exchanger.
Combustible Floor Base
Model: DC-BASE
Figure 1
Coil Cabinet
Model: CE118S
Figure 2
3
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