MG2S Installation Manual

15
14 1/2”
14 1/2”
Floor Cut-Out for
Duct Connector
FURNACE CABINET OUTLINE
Optional floor cutouts for gas,
condensate, or AC linesets
(3 1/2 x 1 1/2 - 2 places)
21 5/
8
TYP.
1/2 TYP.
REAR WALL OF CLOSET OR ALCOVE
2 1/4
16 3/4
Furnace Door
1 1/2 TYP.
C
L
20"
2 3/4
Figure 9. Floor Cutout Dimensions
CEILING CUT-OUTS FOR
VENT & COMBUSTION AIR
C
L
20"
23 3/4"
REAR WALL OF CLOSET OR ALCOVE
FURNACE
OUTER
DOOR
FURNACE OUTLINE
21 7/8
2 1/2
2 3/4
C
L
C
L
C
L
COMBUSTION
AIR INLET
EXHAUST
VENT
Figure 10. Ceiling Cut-Out Dimensions
“X”
FLOOR OPENING
FLOO
R
CAVITY
SUPPLY AIR DUCT
If Floor Cavity
(“X”) is:
Duct Connector
Type & Part Number
Finger Tab Screw Down
7/8” (22) 901987A 904008
2” (51) 901988A 904009
4-1/4” (108) 901989A 904010
6-1/4” (159) 901990A 904011
8-1/4” (210) 901991A 904012
10-1/4” (260) 901992A 904013
12-1/4” (311) 901993A 904014
NOTE: Dimensions shown as Inches (Millimeter)
Table 4. Duct Connector Sizes
Locating & Cutting Floor Openings
IMPORTANT NOTE: Cut-outs in the floor, must be
carefully located to avoid misalignment of the furnace.
1. Measure from the rear wall or alcove and mark the
centerline of the cut-out on the floor. Using the centerline
as a starting point, draw the rest of the duct cut-out to
the dimensions shown in Figure 9.
2. Cut out the floor opening to within 1” of the actual cutout
drawn.
3. Measure from the top of the floor down to the top of the
supply air duct to obtain the depth of the floor cavity.
NOTE: The depth of the floor cavity shown as “X” in
Table 4 will determine the correct duct connector.
4. Determine which duct connector to use from the table.
6. Measure and drill gas hole and cut out for cooling coil
(if applicable).
Locating & Cutting Ceiling Openings
IMPORTANT NOTE: Cut-outs in the ceiling and roof
must be carefully located to avoid misalignment of
the furnace, combustion air piping, and vent piping.
See Figure 10.
1. Measure from the rear wall or alcove and mark the
centerlines of both cut-outs in the ceiling.
2. Using the centerlines as a starting point, draw the rest
of the cut-outs to the dimensions shown in Figure 10.
3. Cut out the ceiling openings.
Installing Finger Tabbed Duct Connectors
The standard duct connector is designed for use on ducts
12” in width. However ducts narrower than 12” may not
allow sufficient clearances for this type of installation.
For an alternate installation method, see Narrow Duct
Attachment - Option 1 or Option 2 on page 16.
1. Center the duct connector in the floor opening with
bottom tabs resting on top of the supply air duct.
2. Mark the cut-out area on the supply air duct by tracing
around the connector tabs of the duct connector. See
Figure 11 (page 16).
3. Remove the duct connector and cut out the marked
area of the supply air duct 1/16” larger the actual cutout
drawn.
4. Install the duct connector back in the floor opening with
the bottom tabs extending into the supply air duct.
5. Install the mounting plate (Figure 11) under the back
side of the duct connector. Align the screw holes in
both components.
6. Secure the duct connector and the mounting plate to
the wood floor with appropriate size screws.
7. Bend the connector tabs on the bottom of the duct
connector upwards and as tight as possible against
the supply air duct. See Figure 11.
8. Seal all connections with industrial grade sealing tape
or liquid sealant. NOTE: Requirements for sealing
ductwork vary from region to region. Consult with local
codes for requirements specific to your area.