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USER’S INFORMATION MANUAL MODEL 349HAV HORIZONTAL GAS FURNACE WARNING: If the information in this manual is not followed exactly, a fire or explosion may result causing property damage, personal in- jury or loss of life. — Do not store or use gasoline or other flam-...
Take a little time now to assure its most efficient operation for years to come. * The output capacity and any representations of efficiency for this furnace are based on standard Department of Energy test procedures. MODEL 349HAV HORIZONTAL FURNACE INSTALLATION DATA SPLIT-SYSTEM...
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Limit switch. Shuts furnace down in the event of an over- heating condition. Pressure switch. Ensures adequate flow of flue products through furnace and out vent system. Control center. MODEL 349HAV HORIZONTAL FURNACE (Unit Shown In Horizontal Left Configuration) —3—...
IMPORTANT FACTS SAFETY floor. If you smell gas, STOP! Follow “B” in the safety information above on CONSIDERATIONS Your furnace must have adequate airflow this furnace label. If you don’t smell for efficient combustion and safe ventila- Installing and servicing heating equip- gas, go to the next step.
SHUTTING DOWN YOUR FURNACE Should you ever suspect a malfunction in your furnace, you will need to turn your furnace off. The following procedures must be followed: 1. Set your room thermostat to the lowest temperature setting. (See Fig. 13.) ®...
• REMOVE THE FILTER FOR WARNING CLEANING AS FOLLOWS: Turn off electrical power supply 1. Turn off electrical supply to the to your furnace before removing furnace. (See Fig. 14.) the access doors to service or 2. Remove blower access door located perform maintenance.
3. Inspect the vent pipe for sags, holes, problems, have a trained service pense of a service call by checking a cracks, or disconnections. Any hori- specialist give your furnace a profes- few things yourself before calling for zontal vent pipe must slope upward, sional check-up annually.
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