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Manafacture: Lennox Hearth File size: 2.39 mb File name: Language of manual:

Before the operation of the vent system can be tested, the lever securing screw must be removed (see Figure 20). The hand operated outside air control lever is located on the left side of the fi replace opening (see Figure 20). STEP 7. INSTALLING OUTSIDE AIR KIT Optional outside make-up air kits, Model FOAK-4 or FAOK-4LD (see Figure 21 on Page 14), may be used with these appliances. Refer to the installation instructions packaged with the air kits for specifi c installation information. If used, the outside air kit must be installed before the fi replace is framed and enclosed in the fi nished wall. Outside air drawn into the fi replace supplies air to the fi re for combustion. Only one outside air duct is necessary, if installed. See Figure 3 on Page 5 for the location of the unit's outside air inlet. If additional length of duct is necessary, purchase locally available U.L. Class 0 or Class 1 metallic ducting. The duct may extend up to 50' (15.24 m) in any direction. Note: When installing the air duct vertically, DO NOT terminate the duct closer than 3' below the chimney top. Outside supplemental combustion air ducting may be run upwards or vertically through framing and ceiling joists, with the hood installed through an outside wall and 3' (1 m) below the termination. Ducting may also be run downward through fl oor joists and under the home to a ventilated crawlspace not considered part of the living area of the home. Outside Air Control Lever Outside Air Control Lever Securing screw Air Shutter in Closed Position Outside Air Control Lever Outside Air Control Lever Securing Screw Removed Air Shutter in Open Position Figure 20: Outside Air Control Lever WARNING DO NOT operate the outside air control lever with a fi re in the fi rebox unless a complete outside combustion air vent system has been installed with the appliance. CAUTION Never locate inlet where it can be blocked by shrubs, snow drifts, etc. Never locate inlet in garage or any area where there is another fuel burning appliance or products emitting combustible gases such as paint, gasoline, etc. In cold climates, it is recommended the outside air duct be insulated. To open the outside air shutter, open the bottom control access panel, reach into the control compartment, and pull the outside air control lever all the way out. The outside air shutter should be fully open when the fi replace is in use and completely closed when the fi replace is not being used. Closing it when not in use will prevent outside cold air from entering the dwelling. Figure 18: Gas Connection Gas Stub 1/2" x 3/8" Flare Shut-Off Valve 3/8" Flex Tubing 3/8" NPT x 3/8" Flare Fitting 3/8" Nipple 3/8" Union 3/8" Close Nipple 3/8" Shut-Off Valve 1/2" x 3/8" Reducer Gas Valve Optional Gas Flex Line Connector Piezo (Optional) Burner ON/OFF Switch Main Gas Shut-Off Valve Gas Valve B-Vent Units Have A Single Door Latch Figure 19: Millivolt Gas Valve—Lower Control Compartment LENNOX HEARTH PRODUCTS • MERIT PLUS® B-VENT G...

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