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_] Furnace Control Fuse The 24V circuit contains a 5-amp, automotive-type fuse located on furnace control. (See Figure 20) Any electrical shorts of 24V wiring during installation, service, or maintenance may cause fuse to blow. If fuse replacement is required, use only a fuse of identical size (5 amp.). Control Connections Jumper _>_/_ __ _ _ DiagnosticLight 24v c4. Duct Design Design and install tioning Contractors ods that conform When the furnace area, the system .0M " _ _ _ 25-24-98 Cutting Side Return Air Opening Plugged ,,Starting 0 /_/'I'I / Hole I air distribution system to comply with Air Condiof America manuals or other approved methto local codes and good trade practices. is located in an area near or adjacent to the living should be carefully designed with returns to mini mize noise transmission through the return air grille. Any blower moving a high volume of air will produce audible noise, which could be objectionable when the furnace is located very close to a living 441 01 2613 02 area. It is often advisable to route the return air ducts under the Filters are not supplied with these furnaces, but can be purchased floor or through the attic, from your distributor. • Refer to furnace Technical Support Manual (Blower Data) for air flow information. • Size ductwork to handle air flow for heating (and air conditioning if so equipped). Duct Installation Requirements When a furnace is installed so that supply ducts carry air circulated by the furnace to areas outside of the space containing the furnace, the return air shall also be handled by duct(s) sealed to the furnace casing and terminating outside the space containing the furnace. CARBON MONOXIDE POISONING HAZARD. Failure to follow safety warning exactly could result in death, personal injury, and/or component damage. Install cooling coil on furnace discharge. Cool air passing over heat exchanger could cause condensate to form resulting in heat exchanger failure. • When the furnace is used with a cooling unit, the furnace shall be installed parallel with or on the upstream side of the cooling unit to avoid condensation in the heating element. With a parallel flow arrangement, the da topers or other means used to control flow of air shall be adequate to prevent chilled air from entering the furnace. Chilled air going through the fur nace could cause condensation and shorten furnace life. Dampers (purchased locally) can be either automatic or manual. Manually or automatically operated dampers MUST be equipped with a means to prevent furnace and air condi tioning operation, unless damper is in the full heat or cool posi tion. • Installation of locking-type dampers is recommended in all branches, or in individual ducts to balance system's air flows. • Non-combustible, flexible duct connectors are recommended for return and supply connections to furnace. • If air return grille is located close to the fan inlet, install at least one 90 ° air turn between fan and inlet grille to reduce noise. • Ductwork installed in attic or exposed to outside temperatures requires a minimum of 2" of insulation with outdoor type vapor barrier. • Ductwork installed in an indoor unconditioned space requires a minimum of 1" of insulation with indoor type vapor barrier. Inspection Panel on some models For a furnace not equipped with a cooling coil, the outlet duct shall be provided with a removable access panel. This opening shall be accessible when the furnace is installed and shall be of such a size that the heat exchanger ca n be viewed for possible openings using light assistance or a probe can be inserted for sampling the air stream. This access cover shall be attached in such a manner as to prevent air leaks. Filters A filter MUST be used. 441 01 2613 02 See Table 4 for required high-velocity filter sizes. iiiiiiiiiiiiiiiiiil.!I.iiiiiiiiiiiii!iiiiiiiiiii _i!!!!:_i;:ii;i;i;i;i;i;i;_;:_:_:_:_i_iiiiiiiiiiiiiiiiiiiii_i_!!i High-Velocity Air Filter Sizes (max.600FPM) Cabinet Internal Filter External Filter Rack Width Bottom Bottom Side+ 151/2 14X25 14X25 14X25 or 16X25 191/2 16X25" 16X25" 16X25" 223/4 20X25" 20X25" 16X25" Greater than 1600 CFM requires both (left and right) side return filter racks in upflow position. + Side return air duct(s) is not permitted with horizontal or downflow furnace installation, Use either filter type: • Washable, high-velocity filters are based on a maximum air flow rating of 600 FPM. • Disposable, low velocity filters are based on a maximum air flow of 300 FPM when used with external filter grille. RISK OF REDUCED FURNACE LIFE Failure to follow these Caution may result in premature furnace component failure. Use of excessively dirty and/or restrictive air filters may increase furnace operating temperatures and shorten the life of the furnace. Filters specified for the furnace are rated at a maximum of 600 FPM air velocity and sized for the furnace's airflow rate. Replacement filters must be of equivalent type, size, and rating except as ...

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