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I-RX-RG-RPV (09-19) PN1027501R0
INSTALLATION—CONTINUED
Venting—Continued
Power-Vented Outdoor Models (Model Series RPV)—Continued
• The option CC3 package (PN 45021) includes the 5-inch vent cap (PN 110052), the adapter assembly (PN 103025),
and the venter seal plate (PN 43446). The 5-inch vent piping and support angles (recommended 1/2-inch × 1/2-
inch, 20 gauge) are field-supplied. Install the option package as follows (see Figure 10):
a. Use venter seal plate as drill template.
b. Attach venter seal plate and oval adapter assembly using sheet metal screws.
c. Connect flue piping and support it with angles as shown in Figure 10.
Condensate Drain
No installation is required for the condensate drain. All furnace bottom panels are provided with holes to eliminate
condensation as follows:
• Model series RX: slots in all four comers
• Model series RPV: a 9/16-inch diameter hole in the corner
• Model series RG: holes in all four corners
Duct Connections
Requirements and suggestions for connecting and installing ducts are as follows:
• Type of ductwork: The type of duel installation to be used depends in part on the type of construction of the roof
(wood joist, steel bar joist, steel truss, pre-cast concrete) and the ceiling (hung, flush, etc.).
• Ductwork material: Rectangular duct should be constructed of not lighter than #26 US gauge galvanized iron or
#24 B&S gauge aluminum.
• Ductwork structure: All duct sections 24 inches (610 mm) or wider and over 48 inches (1219 mm) in length
should be cross-broken on top and bottom and should have standing seams or angle iron braces. Joints should
be S and drive-strip or locked.
• Through masonry walls: No warm air duct should come in contact with masonry walls. Insulate around all air
duct through masonry walls with not less than 1/2 inch (1 inch is recommended) of insulation.
• Through unheated space: Insulate all exposed warm air ducts passing through an unheated space with at least
1/2 inch (1 inch is recommended) of insulation.
• Duct supports: Suspend all ducts securely from building members. Do not support ducts from unit duct connections.
• Duct sizing: Proper sizing of the supply air ductwork is necessary to ensure a satisfactory heating installation.
The recognized authority for such information is the Air Conditioning Contractors Association, 1228 17th Street
NW, Washington, D.C. 20036. A manual that covers duct sizing in detail may be purchased directly from them.
⚠ CAUTION ⚠
Joints where supply air ducts connect to the furnace must be sealed securely to prevent air leakage
into draft hood or burner rack area. Leakage can cause poor combustion and/or pilot problems,
and can shorten heat exchanger life and cause poor performance.
• Removable panels: The ducts should have removable access panels on both upstream and downstream sides
of the furnace. These openings must be accessible when the furnace is in service and should be a minimum of
6 × 10 inches in size so smoke or reflected light may be observed inside the casing to indicate the presence of
leaks in the heat exchanger. The covers for the openings must be attached so as to prevent leakage as follows
(see Figure 11):
a. Locate flanges q on furnace (heat exchanger) that turn out.
b. Shape duct connection w as shown with U-channel on top and bottom and L-channel on sides.
c. Slide U-channels over furnace top and bottom flanges e making connection.
d. Form U-channels to seal sides r. Drill and lock with sheet metal screws.
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