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Фрагмент инструкции
After the return-air duct has been connected to the furnace, install the filter(s) inside the furnace blower compartment. See Fig. 4 for side return application and Fig. 5 for bottom return application. USE ANY OF THE FOLLOWING COMBINATIONS OF OPENINGS: A & B C&D D&E A89013 Fig. 3—Air For Combustion and Ventilation (Outside Air) A bottom closure panel is factory installed in the bottom of the furnace. When bottom return inlet is desired, remove and discard the enclosure panel. Filter-retaining brackets, supports, and retainers are factory assembled and shipped installed for side return application, with 1 set of all required hardware on each furnace. (See Fig. 4.) For bottom return applications, remove the brackets (front and back) and supports from each side. The back bracket(s) are installed in the rear of the furnace casing (dimples are provided to mark mounting screw locations). The front bracket(s) are installed on the bottom front plate as shown in Fig. 5, once the bottom enclosure has been removed. Rotate filter supports 180° so filter will rest on support, and reinstall. (Do not reinstall in 17-1/2 in. casing.) Install the filter retaining rod (small U-shaped end) in the rear bracket, and the front of the filter retainer rod as shown in Fig. 5. Two sets of hardware are needed for furnaces in 24-1/2 in. casings using 2 filters for bottom return. All hardware is provided for filter installation. NOTE: Furnaces with a 17-1/2 in. wide casing require an additional procedure when locating the filter for bottom return-air application. Field-fabricate a sheet metal filler strip 1 X 3 X 24-1/2 in. and install it along side of the filter as shown in Fig. 5. Drive 2 screws through the casing side and into the filler strip to secure it in place. Filter is to rest on top of the filler strip when installed. Table 3—Filter Information (In.) FURNACE FILTER SIZE* FILTER CASING WIDTH Side Return Bottom Return TYPE 14-3/16 (1) 16 X 25 X 1t (1) 14X25X1 Cleanable 17-1/2 (1) 16 X 25 X 11 (1) 16 X 25 X 1 Cleanable 21 (1) 16 X 25 X 1 (1) 20 X 25 X 1t Cleanable 24-1/2 (2) 16 X 25 X 1t (1) 24X25X1 Cleanable ‘Filters can be field-modified by cutting the frame as marked and folding to the desired size. Alternate sizes can be ordered from your distributor or dealer. tFactory provided with the furnace. A WARNING Never operate unit without a filter or with filter access door removed. A failure to follow this warning can cause a fire, personal injury, or death. Step 4— LEVELING LEGS (If Required) When the furnace is used with side inlet(s) and leveling legs are required, refer to Fig. 6 and install field-supplied corrosion-resistant 5/16-in. machine bolts and nuts. NOTE: The length of the bolt should not exceed 1-1/2 in. 1. Lay furnace on its back, locate and drill 5/16-in. diameter hole in each bottom comer of furnace as shown in Fig. 6. 2. Install nut on bolt and install bolt and nut in hole. (Install flat washer if desired.) 3. Install another nut on other side of furnace base. (Install flat washer if desired.) 4. Adjust outside nut to provide desired height, and tighten inside nut to secure arrangement. Step 5—GAS PIPING Gas piping must be installed in accordance with national and local codes. Refer to the current edition of the National Fuel Gas Code. 5 Fig. 5—Bottom Filter Arrangement Canadian installations must be installed in accordance with CAN/CGA-B149 Installation Codes, and all authorities having jurisdiction. The gas supply line should be a separate line running directly from the gas meter to the furnace, if possible. Refer to Table 4 for the recommended gas pipe size. Risers must be used to connect to the furnace and the meter. A CAUTION If a flexible connector is required or allowed by the authority having jurisdiction, black iron pipe shall be installed at the gas valve and extend a minimum of 2 in. outside the furnace casing. Table A—Maximum Capacity of Pipe* NOMINAL IRON PIPE SIZE (IN.) INTERNAL DIAMETER (IN.) LENGTH OF PIPE (FT) 10 20 30 40 50 1/2 0.622 175 120 97 82 73 3/4 0.824 360 250 200 170 151 1 1.049 680 465 375 320 285 1-1/4 1.380 1400 950 770 660 580 1-1/2 1.610 2100 1460 1180 990 900 * Cubic ft of gas per hr, for gas pressures of 0.5 psig (14-in. wc) or less, and a pressure drop of 0.5-in. wc (based on a 0.60 specific gravity gas). Ref: Table 10-2, NFPA 54-1992. Piping should be pressure-tested in accordance with local and national plumbing and gas codes before the furnace has been attached. If the test pressure exceeds 0.5 psig (14-in. wc), the gas supply pipe must be disconnected from the furnace and capped before the pressure test. If the test pressure is equal to or less than 0.5 psig (14-in. wc), close the manual shutoff valve located on the gas valve before the test. It is recommended that the ground joint union be loosened before pressure testing. After all connections have been made, purge the lines and check for leakage with regulated gas su...