Remove 5” filter. Set in a safe location until the compartment is installed. 3. Set the compartment next to the furnace (if possible) to match the opening in the compartment. If the furnace opening cannot be enlarged, a transition fitting should be used. (Figure 3). The compartment can be attached directly (Figure 12), or a starting collar can first be fitted to the furnace inlet. A butt or slip joint can be used. Securely attach the compartment to furnace inlet, using at least two of the mounting holes on each side of the compartment. 4. Using butt joint, attach duct work (normally an elbow) to the upstream side of air filter compartment. (Note the use of the sheet metal turning vanes inside the elbow to improve air distribution.) (Figure 13) NOTE: An optional method of attaching duct work to the air filter cabinet is to modify the compartment (Figure 14) by bending the tabs outward at a 90° angle and attaching duct work to tabs. Transition Fittings If the air duct does not fit the compartment opening, a transition fitting should be used. Gradual transitions are preferred for greatest efficiency. Not more than four inches per linear foot (approximately 20° angle) should be allowed (Figure 3). 5. Connect the vertical duct section to the elbow. Wedge a wood block between floor and elbow for support (Figure 15). 6. Seal all joints in the return air system downstream from the air filter with duct tape to prevent dust from entering the air stream. Tape is usually applied on the Figure 11 Air Flow Turning Vanes Figure 13 Figure 14 outside of ducts, but may also be applied on the 7. With the air filter compartment installed, re-install 5” inside, or both. filter and door. (Figure 2) 6 Vertical Section Wood Block Tape All Joints Vertical Section Wood Block Tape All Joints Figure 15 MAINTENANCE CONDUIT FLOOR DUCT AIR CLEANER Figure 16 s! CAUTION The fiber filter used in this compartment for air cleaning must be replaced every 90 days. Your heating and cooling efficiency will decrease due to insufficient air flow when filter becomes dirty. For maximum efficiency, your air filter should be inspected once a month and changed if dirt loading is heavy. When changing is required, the following procedure should be used: 12 REPAIR and UPGRADE PARTS 3 1. Remove door from air filter compartment by unscrewing the knob. 2. Remove 5” filter and throw away. 3. Replace 5” filter by sliding it into the compartment. (Note direction of air flow.) 4. Replace door. PARTS LIST FOR AIR FILTER COMPARTMENT When ordering repair parts, always give the following information as shown in this list. 1. The PART NUMBER 2. The PART DESCRIPTION 3. The MODEL NUMBER of the Air Filter Compartment Always order by “PART NUMBER” . . . Not by “ITEM NUMBER” Item No. Description Part Number 1000 1400 1600 2000 1 Compartment & Door ACB1000 ACB1400 ACB1600 ACB2000 2 Filters 5” FR1000 FR1400 FR1600 FR2000 3 Screw, Fastener F870-0026 F870-0026 F870-0026 F870-0026 ELECTRONIC AIR CLEANER KIT 7 Descrip...

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