9. After determining that each appliance remaining connected to the common venting system properly vents when tested as indicated in step 3, return doors, windows, exhaust fans, fireplace dampers and any other gas burning appliance to their previous condition of use. 506724-01 Issue 1108 Page 45 of 57 Page 46 of 57 Issue 1108 506724-01 Other Unit Adjustments Primary Limit The primary limit is located on the heating compartment vestibule panel. This limit is factory set and requires no adjustment

intake or exhaust pipe length. What is the altitude? 7 Furnace capacity? FIGURE 21 MINIMUM VENT PIPE LENGTHS IMPORTANT Do not use screens or perforated metal in exhaust or intake terminations. Doing so will cause freeze-ups and may block the terminations. *Any approved termination may be added to the minimum length listed. **This gas furnace must have 3” to 2” reducing ell (supplied or field replacement Canadian kit) installed directly into unit flue collar. TABLE 4 506724-01 Issue 1108 Page 17

Cement should be applied lightly but uniformly to inside of socket. Take care to keep excess cement out of socket. Apply second coat to end of pipe. 7. Immediately after applying last coat of cement to pipe, and while both inside socket surface and end of pipe are wet with cement, forcefully insert end of pipe into socket until it bottoms out. Turn PVC pipe 1/4 turn during assembly (but not after pipe is fully inserted) to distribute cement evenly. Do not turn ABS or cellular core pipe. NOTE: As

ROOF TERMINATED EXHAUST PIPE SIDE WALL TERMINATED EXHAUST PIPE (ALTERNATE LOCATION) FURNACE sectional area as the free area of the openings to which they connect. The minimum dimension of rectangular air ducts shall be no less than 3 inches (75 mm). In calculating free area, the blocking effect of louvers, grilles, or screens must be considered. If the design and free area of protective covering is not known for calculating the size opening required, it may be assumed that wood louvers will have

Units installed at altitudes of 4501 - 10,000 feet (1373 to 3048 m) require a pressure switch change which can be ordered separately. Table 14 lists conversion kit and pressure switch requirements at varying altitudes. The combustion air pressure switch is factory-set and requires no adjustment. Page 36 of 48 Issue 1109 506725-01 Burner Orifice Conversion Kits at Varying Altitudes Unit Size 0 - 7,500 ft (0 - 2,286 m) 7,501 - 10,000 ft (2,286 - 3,038 m) Natural to LP/Propane LP/Propane to Natural

If a gas appliance is operating in a room with negative pressure, the flue products can be pulled back down the vent pipe and into the room. This reverse flow of the flue gas may result in incomplete combustion and the formation of carbon monoxide gas. This toxic gas might then be distributed throughout the house by the furnace duct system. Use fiberglass sealing strips, caulking, or equivalent sealing method between the plenum and the furnace cabinet to ensure a tight seal. If a filter is insta

When you see this symbol on labels or in manuals, be alert to the potential for personal injury or death. CAUTION WARNING As with any mechanical equipment, personal injury can result from contact with sharp sheet metal edges. Be careful when you handle this equipment. Improper installation, adjustment, alteration, service or maintenance can cause property damage, personal injury or loss of life. Installation and service must be performed by a licensed professional installer (or equivalent), serv

EXHAUST VENT INTAKE AIR Side View FIGURE 30 DIRECT VENT CONCENTRIC ROOFTOP TERMINATION 71M80, 69M29 or 60L46 (US) 44W92 or 44W93 (Canada) Minimum Above Average Snow Accumulation SHEET METAL STRAP (Clamp and sheet metal strap must be field installed to support the weight of the termination kit.) FLASHING (Not Furnished) CLAMP FIELD.PROVIDED REDUCER MAY BE REQUIRED TO ADAPT LARGER VENT PIPE SIZE TO TERMINATION 1 1/2" (38mm) accelerator provided on 71M80 & 44W92 12” (305mm) INTAKE AIR EXHAUST VENT

Place the appliance being inspected into operation. Adjust the thermostat so appliance is operating continuously. 7. Test for spillage from draft hood equipped appliances at the draft hood relief opening after 5 minutes of main burner operation. Use the flame of a match or candle. 8. If improper venting is observed during any of the above tests, the venting system must be corrected in accordance with the National Fuel Gas Code, ANSI Z223.1/NFPA 54 and/or CSA B149.1, Natural Gas and Propane Insta

3 Furnace Wiring Specifications .......................... 5 Introduction ....................................... 6 Location/Placement.................................. 7 Air for Combustion & Ventilation ........................ 8 Ducting .......................................... 11 Venting .......................................... 12 Electrical Connections................................ 15 Gas Connections ................................... 16 Control Board & Variable Speed Motor Features .