Hvac Blower Relay Switch Wiring Diagram. Hvac blower motor relay wiring diagram trusted wiring diagrams from hvac fan relay wiring diagram sourcehamzeco. Hvac gas furnace.
30 amp fuse 86 30 87 85 optional 2nd relay overrides temp sensor and turns on fan when ac is turned on temp sensor switch in radiator coolant or optional adjustable fan switch with radiator probe ground switching non variable speed only 5 amp. This diagram gives information of circuit components as well as their placements. Now that we know the basics its time to learn how to wire a fan relay hvac system.
The signal from the thermostat will go to the relay where ever it is located.
However the diagram is a simplified version of the structure. Hvac gas furnace. If it says blower relay youre golden. Wiring diagram the coil will be energized as the current flows through terminals 85 and 86 labeled as relay and relay respectively.