Any suggestions on a t-stat that will do both gas furnace and swamp cooler?

Getting ready to replace non-functioning A/C with a new swamp cooler, and wondering if there is a t-stat that will run both the furnace and the swamp cooler. I'm not liking the idea of having two units side by side on the wall. Is there one that will also control a purge pump?

New cooler will be the Champion 5000 CFM from the orange box store, and will prob have the 3/4 hp motor. Apparently it can be wired for 240v. I just happen to have a spare 240v circuit in the garage.

Current t-stat is a RiteTemp 6020

Thanks

 

Of course it is possible, how easy is another thing entirely. Any heating/cooling thermostat worthy of being sold has the capability of using different sources of control power for heating and cooling. You would need to remove the jumper wire (or jumper plug) between the R and RC terminals. Heating would be on terminals R, W and G if a hot air system. There may be a C as well. The cooling side is RC and Y.

Now for the fun part. If the swamp cooler uses a low-voltage (24 volts nominal AC) for thermostatic control then simply connect the cooler's thermostat leads to the RC and Y terminals of the combined thermostat. HOWEVER, if the swamp cooler uses line-voltage controls then you need to use an intervening relay and low-voltage power supply to separate the low-voltage in the thermostat from the line voltage in the cooler.

Once you know if the swamp cooler uses line or low voltage for control post back and I'll give you the necessary information to use the relay.

 

That cooler will be a line voltage model. Yes he could build a transoformer/relay setup to control the cooler but he wouldnt have a choice of speeds. If he got creative though however, he could also build in a time delay relay to prewet the pads before the blower starts.
To the OP. if you want the dump feature, you can just buy a dump pump with the timer already built in but if I were setting this up, I would just buy the Dial low voltage cooler thermostat from Lowes and be done with it.
The Dial stat not only changes speeds automatically but has the prewet feature and also has a built in dump pump terminal, then all you would have to do is add a regular style pump for dumping purposes.

Also be aware that the big box stores dont tend to carry 230 volt cooler motors but you may get lucky and find one. You would be better off just going with a 110 unit.
Also, the pump that comes with that Champion unit is a joke, you will want to replace it with a Dial 7500 pump.

 

Thanks fellas.

Looks like I'll just have dual thermostats on the wall. Actually, I may have to locate the swamp cooler one in a different location. The furnace t-stat is in the direct path of the airflow from either potential swamp cooler location; probably not ideal.

 

Yeah, you'll want to find a happy medium for the thermostat location but your right, you dont want a ton of air going across it and you also dont want it in a dead area.