Dual Circuit Thermostat?

chuckling150

Member
Location
Wyoming
Occupation
Electrical worker
Anyone have some suggestions on a digital two-circuit thermostat that isn't a King? Might be a hard ask but any advice would be great.
 

roger

Moderator
Staff member
Location
Fl
Occupation
Electrician
Can you tell us a little more of what you are after or trying to accomplish?

Roger
 

StarCat

Industrial Engineering Tech
Location
Moab, UT USA
Occupation
Brewery Engineering Plant Technician - HVACR Electrical and Mechanical Systems
Its not clear what you mean by " two-circuit." Exact information would be helpful.
Depending on what you are controlling there are numerous HVACR type controls that use thermistor type sensors that can be set up for Multi-Stage configurations. I have used the Johnson Controls A-350 Series many times for custom built applications. They are DIN mount and can be expanded after the fact. It looks like they have been superceded by System 450 series, but there is still the 350 series gear at large and available.
The websight is as most, impossible, counter intuitive, and nonsensical.
 

Russs57

Senior Member
Seems like he wants a digital tstat that is a DPST. There seem to be a few options out there.

If I wanted both loads to stage on at the same time I'd add a contactor and have a standard offering tstat control the contactor and the contactor control the loads......if that makes sense to you.

Now if you want different set points/differentials.....or one to be DA and the other RA.....well now we are starting to get a little more complicated. So we would need to better understand what you want to do.
 

Eddie702

Licensed Electrician
Location
Western Massachusetts
Occupation
Electrician
I never herd of 2 circuit. 2 stage thermostats yes. For heating their are units available wit two stage gas valves. Temp drops stg 1 fires if it doesn't keep up and temp drops stag 2 fires up
 

StarCat

Industrial Engineering Tech
Location
Moab, UT USA
Occupation
Brewery Engineering Plant Technician - HVACR Electrical and Mechanical Systems
480 I have a system like this running currently for dual condenser walkin cooler. There are a lot of ways around.
 

jim dungar

Moderator
Staff member
Location
Wisconsin
Occupation
Retired Electrical Engineer - Power Systems
Use the stat to drive some relays.
This is what I had to do for a hydronic heating system which used 'drive-open' and 'drive-closed' valves. Very few reasonably priced electronic stats offer SPDT contacts. I decided to go with a standard stat and just keep a spare relay on hand.
 
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StarCat

Industrial Engineering Tech
Location
Moab, UT USA
Occupation
Brewery Engineering Plant Technician - HVACR Electrical and Mechanical Systems
Penn " Old School " does make Mechanical 2 pole refrigeration thermostats, but this comes off as crude in the current times.
The System 350 are suprisingly not too costly for what they do.
 

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mikeames

Senior Member
Location
Germantown MD
Occupation
Teacher - Master Electrician - 2017 NEC
Line volt 240v stats used for baseboard? Those have a 2 pole SS relay or triac. There are so many different brands. Many even use a PWM control for more even heating.
 

ccow

Member
Location
Arizona
Occupation
Engineering (Power Generation & Transmission, Communications, SCADA/Control Systems)
Many moons ago, I used the heck out of the Ranco ETC series stats for produce coolers. I installed a couple hundred of them, easily. They're great multipurpose stats that can be had in 2-stage, and you can set it to be in cooling or heating mode. Bonus is that we would cut and extend the sensor cables using UR connectors and Belden cable. I know for sure we've done it over 100 feet, maybe more.

 
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