Line volt t stat for switch loop

Status
Not open for further replies.
electrofelon

electrofelon

Senior Member
Location
Cherry Valley NY, Seattle, WA
Occupation
Electrician
I have a 240v heater with power to the heater and a 2 wire switch loop to the thermostat. Is there a digital/programmable t stat that will work with this setup? I'm looking at this one:

www.supplyhouse.com

SupplyHouse.com - Plumbing, Heating & HVAC Supplies - SupplyHouse.com

SupplyHouse.com offers HVAC, PEX, radiant heat, hydronic heating and plumbing supplies. Shop now for great prices on PEX Tubing, thermostats, fittings & more.
www.supplyhouse.com www.supplyhouse.com

But I'm a bit confused. They have one that says DP (not the link) and one that says SP (the linked one). But the SP appears to still have 4 wires. I thought it was probably just the wrong photo, but I looked at the manual and it appears to still use 4 wires. I assume it still needs 240 volts to run the electronics and can't be used for a 2 wire switch loop. Is this correct? Anyone know of one that will work? I know the regular mechanical ones will work but I'm ssuming client wants something higher end.
 
It could be that the DP opens both poles during operation, and the SP opens only one.

With two wires in your loop, you'd only use two wires anyway; make sure you use the correct two.
 
This one appears that it should work in a 2-wire switch loop based on the user manual. It won't work if the heater has a fan in it..



www.homedepot.com

Stelpro KI Z-Wave 7-Day Programmable Wall Thermostat for Electric Baseboard and Convectors in White STZW402WB+ - The Home Depot

The Stelpro KI thermostat for the smart home is the first ever Z-Wave line voltage thermostat in North America. KI thermostats can easily be integrated into the Z-Wave network of your home, allowing you
www.homedepot.com

thesmartcave.com

Stelpro KI Review: Finally, A Line Voltage Smart Thermostat

The Stelpro KI STZW402+ is a smart thermostat for line or high voltage electric heaters. It connects to your smart home via Z-Wave or ZigBee wireless.
thesmartcave.com thesmartcave.com
 
Last edited:
synchro said:
This one works with heaters that have fans:


Sinopé Smart Thermostat for Electric Heating TH1124ZB (Compatible with Alexa) 4000 W / 240 V - - Amazon.com

Sinopé Smart Thermostat for Electric Heating TH1124ZB (Compatible with Alexa) 4000 W / 240 V - - Amazon.com
www.amazon.com
Click to expand...
Thanks. This heater does have a fan.

It appears this is a two wire programmable line voltage. Doesn't appear to need batteries either.

Honeywell RLV4305A1000/E 5-2 Day Programmable TRIAC Line Volt Thermostat
 
Status
Not open for further replies.
Top