White Rodgers pmnACM/ACB Owner's Manual

Also see for Comfort Plus ACB1000: Owner's manual

Contents

6REMOVE OLD FILTER AND DISCARD(Figure 11)NOTE: This filter may be mounted in the furnace compart-ment.CLEAN BLOWER COMPARTMENTNOTE: The air filter cannot remove dirt from blower andducts.INSTALLATIONThe following is a typical installation of the air filter on a“Highboy” furnace (Figure 7).1. Place the air filter compartment on the floor. Stand itupright with the door facing you (Figure 2). If ahorizontal installation is being planned, lay the com-partment on its side, this will help you to visualize therelative location of all parts.2. Unscrew the knob, remove the door (by grasping topand pulling door away from compartment) and set itaside. Remove 5” filter. Set in a safe location until thecompartment 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 transi-tion fitting should be used. (Figure 3).The compartment can be attached directly (Figure12), or a starting collar can first be fitted to the furnaceinlet. 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 sideof the compartment.4. Using butt joint, attach duct work (normally an elbow)to the upstream side of air filter compartment. (Notethe use of the sheet metal turning vanes inside theelbow to improve air distribution.) (Figure 13)NOTE: An optional method of attaching duct work to theair filter cabinet is to modify the compartment (Figure 14)by bending the tabs outward at a 90° angle and attachingduct work to tabs.Transition FittingsIf the air duct does not fit the compartment opening, atransition fitting should be used. Gradual transitions arepreferred for greatest efficiency. Not more than fourinches per linear foot (approximately 20° angle) should beallowed (Figure 3).5. Connect the vertical duct section to the elbow. Wedgea wood block between floor and elbow for support(Figure 15).6. Seal all joints in the return air system downstreamfrom the air filter with duct tape to prevent dust fromentering the air stream. Tape is usually applied on theoutside of ducts, but may also be applied on theinside, or both.INSTALLATION7. With the air filter compartment installed, re-install 5”filter and door. (Figure 2)Figure 11Air Flow TurningVanesFigure 13Optional method(Bend tabs outward at 90˚ angle) Figure 14