All installations and services must be performed by qualified service personnel.
4
ALCOVE INSTALLATION
In this application, a minimum of 18 inches of clearance
must
be provided to the front of the unit. Refer to Figure
3.
GMA1/GMC1 SERIES
Figure 3
CLOSET INSTALLATION
c
WARNING:
HAZARD OF ASPHYXIATION: A
suction effect will occur when the furnace is
operating inside the closet with the closet door
closed. For proper operation, the furnace blower
shall create no more than a 0.05-inch water column
pressure differential between the closet and the
adjoining space.
c
WARNING:
Do not obstruct any return air
openings, including the return grille on the furnace.
To do so may cause the furnace to activate the high
temperature limit and shutdown, or it may cause
asphyxiation.
GMA1/GMC1 SERIES
Figure 4
The return air opening into the closet is to have a
minimum free area of 250 square inches, (refer to
Figure 4).
The return air opening may be located in the top, the
center or the bottom of the closet door, or sidewall.
c
WARNING:
Do not obstruct any return air
openings, including the return grille on the furnace.
To do so may cause the furnace to activate the high
temperature limit and shutdown, or it may cause
asphyxiation.
The cross-sectional area of the return air grille leading
into the closet (when located in the floor or ceiling) shall
not be less than 250 square inches.
Materials located in the return air system must have a
flame spread classification of 200 or less.
Wiring materials located in the return air duct system
must conform to Article 300-22 of the latest edition of the
National Electrical Code, NFPA 70.
Gas piping shall not be located in, or extend through, the
return air duct system.
ROOF JACK
The roof jack assembly and accessories must be listed
by a nationally recognized testing agency for the
appropriate heating fuel. See Table 2 for the Roof jack
Models approved to be used with the GMA / GMC
furnace.
Manufacture
Model
Length below
Flashing
Thermo Products, LLC
TRJC-2
20” to 36”
Thermo Products, LLC
TRJC-3
27” to 47”
Nortek
(F,S)AW1523-
(0,2,4)(A,S)
15" to 23"
Nortek
(F,S)AW2135-
(0,2,4)(A,S)
21" to 35”
Nortek
(F,S)AW2747-
(0,2,4)(A,S
27" to 47”
JCI
4000-7121/C:
15" to 26"
JCI
4000-7141/C
23" to 44"
JCI
4000-7151/C
30" to 47"
TABLE 2
The roof jack assembly must be installed according to
the instructions provided with the Roof Jack prior to the
furnace installation. (Refer to Figure 3 for flue cutout).
Adapters for pitched roofs as well as extended barrel
length roof jacks are available from Thermo Products
and/or other suppliers.
All vent seams and connections must be sealed with
high temperature silicone caulk.
DC-BASE COMBUSTIBLE FLOOR BASE
Make the floor cutouts as shown in Figure 5.
Measure the distance from the surface of the floor to the
top of the supply duct. Cut the DC-BASE assembly
connector duct to equal the measured distance.
Place the locating bracket (supplied with the DC-BASE
assembly) on the back edge of the floor opening. The
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