The Mac-4 multiple appliance controller is designed for interlocking up to four appliances with power venters, draft inducers, or In-Forcers™. According to the manufacturer, the Mac-4 puts an end to difficult and costly job site wiring nightmares. Solid- state design offers variable voltage input (18-130 vac) to easily interlock with 24 vac and 115 vac control systems for gas and oil burners, eliminating the need for voltage specific relays, it says. Circuit board is housed in oversized 18 gauge electrical box with multiple knock-outs for easy wiring connections.
— Tjernlund Products, Inc.
White Bear Lake, MN