This is based on the draw from the fans if the fans are larger and draw more than 15 amps each it s recommended to install a second relay kit as shown below.
Dual cooling fan relay wiring diagram.
And if a relay fails you will still have one fan running.
Primary cooling fan dual fans with dual relays single speed on off using ground switched devices only for primary activation using dual relays for two fans is not required.
Cooling fan relay wiring diagram how to wire a fan relay hvac in dual fan relay wiring diagram image size 730 x 656 px and to view image details please click the image.
Or a single relay could be used to control both fans.
There are several ways that a dual fan can be wired.
Wiring dual cooling fans.
You could use one relay.
It uses a 40 amp electric relay and electric fan sensor.
The cooling fan wiring diagram below is what we ve found to be the simplest and most reliable method.
Electric fan relay wiring diagram wiring diagram is a simplified tolerable pictorial representation of an electrical circuit it shows the components of the circuit as simplified shapes and the capability and signal contacts between the devices.
With dual cooling fans there are two methods for wiring up the relay kit.
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However two relays will divide the load.