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I-RX-RG-RPV (09-19) PN1027501R0
INSTALLATION—CONTINUED
Venting—Continued
Gravity-Vented Outdoor Models (H)-RX,CRX,RG,CRG—Continued
The gravity vent cap requires field installation. For furnaces that do not require vent cap extension (unit sizes 75–250
and high-efficiency size 300), align holes and attach vent cap to furnace flue collar using sheet metal screws. For
furnaces that do require vent cap extension (standard-efficiency unit size 300 and all sizes 350 and 400), a 12-inch
extension is necessary to raise the vent cap above the top of the furnace. Install this extension as follows:
NOTE: IMPORTANT REQUIREMENT: For proper operation of the gravity vent cap, position the pre-
punched holes (see DETAIL B, Figure 8) so that the solid side panel of the cap faces the control
compartment access panel side of the furnace.
1. Remove extension (PN 20524, see DETAIL A, Figure 8) from inside of vent cap (extension is packed inside cap).
2. Attach extension to furnace flue collar as follows:
a. Position 3/8-inch center line clearance holes at bottom and wrap extension around flue collar on top of furnace.
b. Align holes in extension with holes in flue collar.
c. Secure extension using #10-1/2 sheet metal screws.
3. Attach vent cap (see DETAIL B, Figure 8) to extension as follows:
a. Position vent cap into top of extension.
b. Align holes and push cap into extension.
c. Secure vent cap using #10-1/2 sheet metal screws.
Figure 8. Vent Cap Extension and Vent Cap
Optional Flue Extension for Gravity Vent (Model Series RX or RG with Option ZZ)
• Outdoor, gravity-vented furnaces that are factory-built with option ZZ are designed to release flue gases 4 feet
above the top of the furnace. A field-provided 4-foot (1.2-meter) vent extension must be installed between the top
of the furnace and the bottom of the vent cap.
• Furnaces with option ZZ (factory-installed restrictor plus field-provided 4-foot stack) may be installed adjacent to
fresh air inlet(s) when local code requires that release of flue gases be above an adjacent fresh air inlet that is
not part of the furnace.
• The optional flue extension applies only to furnaces with the suffix Z in the model number (e.g., RX-400-6Z).
• To secure the flue extension, three guy wires, spaced 120-degrees apart, must be fastened between the extension
and the furnace top using sheet metal screws as shown in Figure 9,
DETAIL A
DETAIL B
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