[. . . ] TJERNLUND PRODUCTS, INC. 1601 Ninth Street · White Bear Lake, MN 55110-6794 PHONE (800) 255-4208 · (651) 426-2993 · FAX (651) 426-9547 Visit our web site · www. tjernlund. com COMMERCIAL PAI SERIES FAN PROVER REPLACEMENT KIT NOTE: YOUR FAN PROVING SWITCH MAY NOT BE DEFECTIVE. [. . . ] If cleaning was necessary, try operating IN-FORCER before replacing the Fan Proving Switch. Also verify the Fan Prover Sensing tube does not have kinks in it and both ends are properly connected to Fan Prover sensing probe and fan housing sensing tube. If Fan Proving Switch is still not making follow replacement procedure below. WARNING: Disconnect power from IN-FORCER TM and equipment before installing Fan Proving Switch. 1. 4. Remove wires connected to existing Fan Proving Switch terminals. Carefully remove flexible tubing from old Fan Proving Switch sensing probe and remove switch. [. . . ] 7. For technical assistance contact Tjernlund's Technical Customer Service at 1-800-255-4208; M-F 7:30 - 4:30 CST. DIAGRAM A DIAGRAM B P/N 8504086 Copyright © 2000 Tjernlund Products, Inc. [. . . ]