[moynihan1129]

Hi all,

I have recently purchased a MYSA smart thermostat for my basement and am having trouble connecting it. One file shows what I currently have in my gang box:
-2 Whites wire nutted together
-2 Black - L1 and T1
-2 Red - L2 and T2

Also shows the connections on the back of the new thermostat. When I wired it as shown by MYSA, the heater comes on High and stays on high. Can anyone help?

 

[TarheelTerp]

I have recently purchased a MYSA smart thermostat

for my (electric baseboard heat). Can anyone help?

Can we assume the heaters are all 240V
and fed by a 2P breaker out of the panel?

Can we assume the existing (and likely perfectly fine) thermostat
does NOT break both of the 240V hot wires?

Which feed wire does the current t-stat break... White or Black?

 

[moynihan1129]

Can we assume the heaters are all 240V
and fed by a 2P breaker out of the panel?

Can we assume the existing (and likely perfectly fine) thermostat
does NOT break both of the 240V hot wires?

Which feed wire does the current t-stat break... White or Black?

I am not sure what line the current t-stat breaks. I was only replacing because the kids over torqued the knob and broke the existing thermostat. Was hoping for a simple replace, but likely will have to take the heater apart and check wiring there if nobody here has any advice.

 

[moynihan1129]

I am not sure what line the current t-stat breaks. I was only replacing because the kids over torqued the knob and broke the existing thermostat. Was hoping for a simple replace, but likely will have to take the heater apart and check wiring there if nobody here has any advice.

Just checked wiring --- T1 and T2 both go to the heater and L1 and L2 both go to the panel.

 

[TarheelTerp]

I am not sure what line the current t-stat breaks.

Looking at the picture above...
in addition to the Blk and Wht commonly found in romex...
do you have conduit and red wire from the breaker?

 

[moynihan1129]

Looking at the picture above...

substitute their red for the white actually inside the romex cable you have.
Only the black wire goes through a thermostat.

And just wire nut the reds? Wouldn't that create 120V always going to the heater?

 

[moynihan1129]

And just wire nut the reds? Wouldn't that create 120V always going to the heater?

Looking at the picture above...
in addition to the Blk and Wht commonly found in romex...
do you have conduit and red wire from the breaker?

Yes - Took the heater apart and confirmed the following:

From the breaker: red and Black Hot. White is ground.
To the heater - Red and black - White is ground.
In the heater - Black and red connected to hot terminals. White is ground.
Could the issue be that the red and black are reversed in the heater?