Intertherm M1B Series, Installation Instructions Manual

Page: 10 / 36

10
Round Duct connector Installation
1. Apply a bead of caulking, mastic, or other approved
sealant around bottom side of connector.
2. Install and center the duct connector in the floor opening.
3. Install the mounting plate under the back side of the
duct connector. See Figure 13 .
notE:
Align the screw
holes in both components.
4. Secure the duct connector and the mounting plate to
the wood floor with appropriate size screws.
5. Connect the round supply duct to the underside of the
duct connector and secure them with field supplied
sheet metal screws.
6. 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.
Installing the Furnace
Sides and back of the furnace may be enclosed by wall
framing such as in a closet or alcove. The dimensions
of the room or alcove must be able to accommodate the
overall size of the furnace shown in
Figure 4 (page 6)
and the installation clearances outlined on page 5 . The
furnace shall be appropriately connected to the supply
and return air distribution system as shown in
Figure 14
(page 10) & Figure 15 (page 11) .
1. Remove furnace outer door(s) and bottom fuel line
knockout.
2. Place furnace onto duct connector and center with floor
opening.
3. Slide onto mounting plate. (Bottom rear slots on furnace
should engage with mounting plate tabs.)
4. Secure front with one (1) fastener at each corner. See
Figure 14 & Figure 15 .
notE: Additional fasteners may be used at rear, sides
or through door frame, as desired, to secure furnace to
closet or alcove framing.
Figure 10
DUCT CONNECTOR
SUPPLY
AIR DUCT
BEND TABS TIGHTLY
AGAINST SUPPLY AIR DUCT
Figure 10. Duct Connector Tabs
Figure 11
Figure 11. narrow air Duct openings
OPTION 1 OPTION 2
Supply
Air Duct
F
old Flap Here
F
old Flap Here
Remove
this
Flap
Remove
this
Flap
Cut Here
Cut Here
Cut Here
Cut Here
Cut Here
Cut Here
Cut Here
Cut Here
Cut Here
F
old Flap Here
F
old Flap Here
Figure 12
Narrow
Duct
Narrow
Duct
Duct connector tabs
Staples or sheet metal screws
Duct
Flap
Narrow
Duct
Duct
Connector
Sheet metal
screws
Figure 12. Narrow Ducts
Figure 13
DUCT
CONNECTOR
MOUNTING
PLATE
SCREWS
FUEL LINE
HOLES
14” SUPPLY CONNECTION
Figure 13. Round Duct connector Installed
Figure 14
MTG. PLATE TABS
SLIDE FURNACE
ALL THE WAY BACK
ONTO MTG. PLATE
SUPPLY AIR DUCT
Knockout Over Holes
SECURE FURNACE
WITH 2 FASTENERS AT FRONT
CORNER HOLES
Figure 14. “a” & “B” cabinet Furnaces