How the fan center works - YouTube Click to view on Bing7:12Jan 14, 2014This video is about The fan center is used on furnaces to turn on the fan without the heat or if air conditioning. How a Relay Works with the 90-340 Mulitpurpose Relays!: Function, WiringAuthor: grayfurnacemanViews: 54K How to wire a fan center to a limit control switch - ASAP Oct 31, 2010How to wire a fan center to a limit control switch - Answered by a verified HVAC Technician SO i hav e a Zettler ZC90340 fan center I am wiring to an older oil furnace with a heat pump . The relay is in place and wired . I just need to figure out the power wiring. it is a Thermo pride oil fired furnace OL11-105.
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