2 thermostats for 1 fan

[lovetofly]

hello.
I would want to run a ventilation fan in a small room at 1/2 speed all the time except between about 75 to 80 degrees where i want 1/1 speed, when the temperature exceeds this temperature, a separate cooling unit will kick in and the fan should go down to 1/2 speed again.

Can this be done with 2 thermostats in parallel to 1 transformer with 2 switches?

Edit: should be done in a easy way without PLC or DUC

[thatguy]

hello.
I would want to run a ventilation fan in a small room at 1/2 speed all the time except between about 75 to 80 degrees where i want 1/1 speed, when the temperature exceeds this temperature, a separate cooling unit will kick in and the fan should go down to 1/2 speed again.

Can this be done with 2 thermostats in parallel to 1 transformer with 2 switches?

Edit: should be done in a easy way without PLC or DUC

We can’t provide DIY advice on how to do it but what you are asking to do sounds possible with one thermostat, one transformer, and some relays. The setup would differ depending on the wiring configuration that the motor requires.

In short, the answer is most likely yes.

What is PLC and DUC?


Sent from my iPhone using Tapatalk

[jbhenergy]

Logic controls. think "if/then and/or" type stuff. similar to building HVAC controls. just different forms of language.

[crazzycajun]

It can be done easier with a multi speed fan and a relay and one tstat if I understand you correctly

[thatguy]

Logic controls. think "if/then and/or" type stuff. similar to building HVAC controls. just different forms of language.

That wouldn’t be necessary


Sent from my iPhone using Tapatalk

[jbhenergy]

That wouldn’t be necessary


Sent from my iPhone using Tapatalk

I agree, I was just pointing out what plc controls were since you stated you had not heard of them before.

That is all


Sent from my iPhone using Tapatalk

[2sac]

2 stage temp control and a couple relays