NOTE:
Read the entire instruction manual before starting the installation.
INTRODUCTION
This instruction covers installation of floor subbase Part No. KGASB0201ALL for use with downflow gas furnaces. The design of the subbase
is A.G.A. certified for use with a downflow gas furnace.
SAFETY CONSIDERATIONS
Installing and servicing heating equipment can be hazardous due to gas and electrical components. Only trained personnel should install or service
heating equipment.
Untrained personnel can perform basic maintenance functions such as cleaning coils, or cleaning and replacing filters. All other operations should
be performed by trained service personnel. When working on heating equipment, observe precautions in the literature, on tags, and on labels
attached to the unit.
Follow all safety codes. Wear safety glasses and work gloves. Have a fire extinguisher available.
DESCRIPTION AND USAGE
This floor subbase must be used when installing a downflow gas furnace (with or without an evaporator coil) on a combustible floor. The subbase
kit, when properly installed, will allow safe installation of the furnace.
The kit contains the following items:
Side rail
2
Insulation strips (1-1/4 in. X 92 in.)
3
Locating tab (1 in. X 2-1/2 in.)
2
Screw
4
Double-sided tape (3/4 in. X 23 ft)
1
Installation Instructions
1
INSTALLATION
1. Cut and frame hole in floor according to dimensions in Table 1 and Fig. 3.
2. Assemble floor subbase.
a. Arrange base parts as shown in Fig. 2.
b. Assemble front and rear adjustable rails. See Table 1 for selection of screw holes for width adjustment. The hole number must correspond
to the size furnace being installed.
NOTE:
Each successive hole in the adjustable rail must be matched with the same numbered hole of the opposite rail, first hole to first hole,
second hole to second hole, etc. (See Table 1 and Fig. 2.)
c. Fasten rails together with screws provided in kit. (See Fig. 2.)
3. Install factory-supplied strips of insulation on top and bottom sides of adjustable rails. (See Fig. 3.)
a. Cut double-sided adhesive tape to proper length.
b. Apply double-sided adhesive tape to top and bottom of adjustable rails.
c. Cut insulation to proper length.
d. Remove protective backing from double-sided tape to expose adhesive.
e. Apply strips of insulation to adhesive tape. Insulation must be properly installed to ensure an adequate seal and prevent air leakage
between floor and base, and base and plenum. (See Fig. 3.)
4. Install subbase over hole cut in floor.
5. Install plenum into floor subbase assembly.
NOTE:
The flange around the plenum top should be 1-1/4-in. maximum, 7/8-in. minimum to provide an adequate seal between the furnace or
coil casing and the plenum.
6. Install factory-supplied strips of insulation to plenum top. (See Fig. 4.)
Installation Instructions
KGASB0201ALL
Subbase Kit
Downflow Furnace Subbase for
Use on Combustible Floors
Form:
AG-GASB-02
Cancels:
AG-GASB-01
Printed in U.S.A.
08-93
Catalog No.
92-33GA-SB2
