First time poster here. I've been following these Houghton threads on this forum for quite a while since we installed a Houghton 3400 in our class-b last summer.
Last week I installed a relay to fix the humidity problem by allowing the low speed fan to get power only when the compressor is on. Auto mode works a lot better now in testing.
This is the relay I used but any relay with a 120v AC coil should work. https://www.amazon.com/dp/B087G6D24G Two pack because I like to have spares.
There are multiple ways and connectors you can use to do it, but I used Wago three wire connector to connect the wire marked COMP to one side of the coil. Then another connector to add the N1 wire to the other coil terminal. Then connected the Fan low wire on the normally open terminal.
I still have a problem where the thermostat is not at all accurate, but I'm trying something this weekend to try and improve that.
