StyleCrest Installation Manual

9
NOTE: The duct connector tabs may be attached to
the air duct with sheet metal screws or other suitable
fasteners as long as the duct connector and the air duct
are securely attached.
7. 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.
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 (page 8). 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 5)
and the installation clearances outlined on page 4. The
furnace shall be appropriately connected to the supply
distribution system as shown in Figure 14 (page 8) &
Figure 15 (page 8).
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.
ROOF JACK INSTALLATION
Required ceiling and roof cut-out openings must be
carefully located to avoid misalignment of the furnace
and Roof Jack. NOTE: Install only roof jack assemblies
listed in Table 3, (page 10) on this heating appliance.
Roof Jack Selection
1. Determine depth of ceiling cavity from center of roof
opening to center of ceiling opening noted as “Dimension
A” in Figure 16 (page 10).
2. Determine ceiling height and subtract height of furnace
noted as “Dimension B” in Figure 16.
3. Add dimensions “A” & “B” (and X from Table 4, (page
10) if slant deck flashing is used). The total length of
[A] + [B] + [X] must be within the minimum and maximum
range of the roof jack listed in Table 3.
Application Notes
• FAW, FAWT, SAW and SAWT series roof jacks with a
5” diameter inner vent pipe may be used with all models
of MG1 Series gas furnaces.
F = Flat Flashing: flexes from 0/12 to 1/12 roof slope.
See Figure 17 (page 10).
S = Slant Flashing: 2.5/12 Slope flexes from 1/12 to
4/12 roof slope, 4/12 flexes from 3/12 to 5/12.
See Figure 18 (page 10).
• MG1 furnaces may be used with roof jack systems and
extension accessories as tall as 170” (except MG1-056
models, which are limited to 120”). An internal roof jack
extension (p/n 901935 - 10”, p/n 903107 - 18”) can be
used to increase roof jack height. All connections inside
the home must be made below the ceiling.
• This furnace must never be connected to a chimney
flue servicing a fireplace or other appliance designed
to burn solid fuel.
• If the roof jack crown is covered or blocked with snow, the
furnace will not operate properly. If the home is located
in regions where snow accumulation exceeds 7” (HUD
snowload zones) use an external roof jack extension
(p/n 901937). A maximum of 2 extensions per roof jacks
can be used. Extensions are optional accessories and
may be purchased through your distributor.
Locating & Cutting Roof / Ceiling Openings
IMPORTANT NOTE:
Do not allow debris to fall into the furnace. This
could cause unsafe operation and void the furnace
warranty. Use the top cap that comes with the furnace
packaging (or alternate protector) to prevent debris
from falling into the furnace before the final roof jack
connection is made.
NOTE: Refer to the installation instructions provided
with optional air conditioning packages when installing
furnaces with optional cooling coil cabinet or with optional
C* series indoor coils.
1. Locate center of Roof Jack opening, measure 13 1/2”
from the rear wall of closet or alcove along the center
line of furnace and floor opening. See Figure 19.
2. Cut ceiling and roof holes:
• Ceiling = 8 3/4” (222 mm) diameter
• Roof = 9 3/8” (238 mm) diameter