How do I install Mysa with 120 V Installations?

Connect your Mysa Smart Thermostat using supplied wire nuts. Click here on to learn how to properly use a wire nut. 

Please verify which version of Mysa you are installing. If your Mysa has four wires then it is Mysa-V1-0. If your Mysa has three wires, then it is Mysa-V1-1. Functionally, these thermostats are the same, just with slightly different wiring.

Mysa-V1-0

120V Wiring Instructions

A. Connect Mysa’s white wire to the neutral wire - N (usually white).

B. Connect Mysa’s black wire to the supply wire - L1 (usually black) coming from the electrical panel.

C. Connect Mysa’s red wire to the load wire (usually black) going to heater.

D. Connect Mysa’s green wire to the ground wire (usually green or bare copper).

In summary:

gret.png Mysa White Screen_Shot_2018-10-22_at_1.49.46_PM.png gret.png  Neutral Wire (N)
Screen_Shot_2018-10-22_at_1.51.54_PM.png Mysa Black Screen_Shot_2018-10-22_at_1.49.46_PM.png Screen_Shot_2018-10-22_at_1.51.54_PM.png  Supply Wire (L1)
 Screen_Shot_2018-10-22_at_1.51.58_PM.png  Mysa Red Screen_Shot_2018-10-22_at_1.49.46_PM.png Screen_Shot_2018-10-22_at_1.51.54_PM.png  Load Wire
Screen_Shot_2018-10-22_at_1.52.02_PM.png Mysa Green Screen_Shot_2018-10-22_at_1.49.46_PM.png Screen_Shot_2018-10-22_at_1.52.02_PM.png  Group/Copper
 

120V Wiring DiagramScreen_Shot_2018-10-22_at_2.02.44_PM.png

Mysa-V1-1

120V Wiring Instructions

A. Connect Mysa’s red L2 wire to the neutral wire - N (usually white).

B. Connect Mysa’s black L1 wire to the supply wire - L1 (usually black) coming from the electrical panel.

C. Connect Mysa’s black load wire to the load wire (usually black) going to the heater.

D. Connect Mysa’s green wire to the ground wire (usually green or bare copper).

In summary:

Screen_Shot_2018-10-22_at_1.51.58_PM.png Mysa L2 Screen_Shot_2018-10-22_at_1.49.46_PM.png gret.png  Neutral Wire (N)
Screen_Shot_2018-10-22_at_1.51.54_PM.png Mysa L1 Screen_Shot_2018-10-22_at_1.49.46_PM.png Screen_Shot_2018-10-22_at_1.51.54_PM.png  Supply Wire (L1)
Screen_Shot_2018-10-22_at_1.51.54_PM.png Mysa Load Screen_Shot_2018-10-22_at_1.49.46_PM.png Screen_Shot_2018-10-22_at_1.51.54_PM.png  Load Wire
         

 

Mysa_Installation_Diagrams_v4_UpdatedDec2018_2C-RW-01.png

For more detailed instructions or different wiring setups,
download the Mysa App, tap on “Install & Support”, then “Install”.

Important

The supply and load wires are not interchangeable. If you are unsure which of the two wires is the supply or load wire, simply try one configuration. If Mysa’s display doesn’t light up after finishing the installation, swap the supply and load wires.

 

Can’t find your answer in our support center? Contact us directly.