Intake Piping

This furnace may be installed in either direct vent or non- direct vent applications. In non-direct vent applications, when intake air will be drawn into the furnace from the surrounding space, the indoor air quality must be considered. Guidelines listed in Combustion, Dilution and Ventilation Air section must be followed.

Follow the next two steps when installing the unit in Direct Vent applications, where combustion air is taken from outdoors and flue gases are discharged outdoors. The provided air intake screen must not be used in direct vent applications (outdoors).

1.Use cement or a sheet metal screw to secure the intake pipe to the inlet air connector.

2.Route piping to outside of structure. Continue with installation following instructions given in general guide lines for piping terminations and intake and exhaust piping terminations for direct vent sections. Refer to Table 7 for pipe sizes.

TYPICAL AIR INTAKE PIPE CONNECTIONS

NON−DIRECT VENT APPLICATIONS

AIR

INTAKE SCREEN (Provided)

NOTE: Air intake screen and elbow may be rotated, so that screen may be positioned to face forward or to either side.

FIGURE 22

Follow the next two steps when installing the unit in Non-Direct Vent applications where combustion air is taken from indoors and flue gases are discharged outdoors.

1.Use field-provided materials and the factory-provided air intake screen to route the intake piping as shown in Figure 23. Maintain a minimum clearance of 3" (76 mm) around the air intake opening. The air intake opening (with the protective screen) should always be directed forward, or sideways.

2.Use a sheet metal screw to secure the intake pipe to the connector, if desired.

General Guidelines for Vent Terminations

In Non-Direct Vent applications, combustion air is taken from indoors and the flue gases are discharged to the outdoors. This unit is then classified as a non-direct vent, Category IV gas furnace.

In Direct Vent applications, combustion air is taken from outdoors and the flue gases are discharged to the outdoors. This unit is then classified as a direct vent, Category IV gas furnace.

In both Non-Direct Vent and Direct Vent applications, the vent termination is limited by local building codes. In the absence of local codes, refer to the current National Fuel Gas Code ANSI Z223-1/NFPA 54 in U.S.A., and current CSA- B149 Natural Gas and Propane Installation Codes in Canada for details.

Position termination according to location given in Figure 23 or 24. In addition, position termination so it is free from any obstructions and 12" above the average snow accumulation. At vent termination, care must be taken to maintain protective coatings over building materials (prolonged exposure to exhaust condensate can destroy protective coatings). It is recommended that the exhaust outlet not be located within 6 feet (1.8 m) of a condensing unit because the condensate can damage the painted coating.

NOTE: If winter design temperature is below 32° F (0° C), it is recommended that the exhaust piping be insulated with 1/2" (13 mm), Armaflex or equivalent when run through an unconditioned area. In extremely cold climate areas with temperature below 20° F (6.7° C) it is recommended that 3/4" (19 mm) Armaflex or equivalent be used. Insulation on outside runs of exhaust pipe may be painted or wrapped to protect insulation from deterioration in accordance with the insulation manufacturers recommendation. Exhaust pipe insulation may not be necessary in some specific applications.

NOTE: During extremely cold temperatures, below approximately 20° F (6° C), units with long runs of vent pipe through unconditioned space, even when insulated, may form ice in the exhaust termination that prevents the unit from operating properly. Longer run times of at least 5 minutes will alleviate most icing problems. Also, a heating cable may be installed on exhaust piping and termination to prevent freeze-ups. Heating cable installation kits are available, see unit specification sheets for part numbers.

IMPORTANT

Do not use screens or perforated metal in exhaust terminations. Doing so will cause freeze-ups and may block the terminations.

IMPORTANT

For Canadian Installations Only:

In accordance to CSA International B149 installation codes, the minimum allowed distance between the combustion air intake inlet and the exhaust outlet of other appliances shall not be less than 12 inches (305 mm).

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Issue 1109

506725-01

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Allied Air Enterprises A93DF Intake Piping, Typical AIR Intake Pipe Connections, General Guidelines for Vent Terminations
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A95DF, 95G1DF, A93DF, 92G1DF specifications

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