MyStat Installation

| Precautions

Polarity Warning: Incorrect polarity wiring with a shared transformer can damage powered devices.
Power Safety: Always turn off the power before connecting or disconnecting wiring.
Circuit Board Protection: Ensure powered wires do not touch the circuit boards.
Code Compliance: Install in accordance with all state and local codes.
Assembly Caution: Do not assemble the front to the back plate while the device is powered on.
Auto-Calibration: MyStat requires seven days to auto-calibrate and reach a steady state.
Sensor Care: Avoid mechanical stress on the CO₂ sensor for accurate readings.

Position the MyStat mounting plate and the back plate over the vertically fixed gang box. Ensure the back plate fully covers the gang box. Then secure both plates to the gang box using the provided Phillips screws.
Align the top plastic of the MyStat with the mounting plate. Push gently until it locks into place.
Use the provided socket head screw to secure the MyStat to the mounting plate.

Drywall mounting illustration

Electrical box mounting illustration

1. MyStat (included in box)	4. Gang Plate 1 (included in box)
2. Mounting Screws (included in box)	5. Gang Plate 2 (included in box)
3. Mounting Plate (included in box)	6. Gang Box (NOT included in box)

MyStat Dimensions.png

Remove the socket head screw. If the MyStat is wall-mounted, grasp the front plastic and gently pull it away from the wall.

Recommended wiring: 18 gauge solid or strained

MyStat v1 wiring diagram.png

I/O Type	Purpose	Default Configuration	Configuration Options
Relay 1	To enable staged conditioning controls	Cooling Stage 1	Cooling Stage 1 Cooling Stage 2 Heating Stage 1 Heating Stage 2 Fan Low Speed Fan High Speed Fan Enable Occupied Enable Humidifier Dehumidifier Externally Mapped DCV Damper
Relay 2	To enable staged conditioning controls	Fan Low Speed
Relay 3	To enable staged conditioning controls	Heating Stage 1
Relay 4	To enable staged conditioning controls	Fan High Speed
Analog Out	To enable modulating conditioning controls	Water Modulating Valve	Cooling Linear Fan Speed Heating Staged Fan Speed Externally Mapped DCV Modulating Damper
Universal In	To enable the supply water temperature measurement	Key Card Sensor (AI)	Supply Air Temperature Generic Alarm NO Generic Alarm NC Key Card Sensor (AI) Door/Window (N/C) - Title 24 Door/Window (AI) - Title 24

I/O Type	Purpose	Default Configuration	Configuration Options
Relay 1	To enable staged conditioning controls	Water Valve	Fan Low Speed Fan High Speed Aux Heating Water Valve Fan Enable Occupied Enable Humidifier Dehumidifier Externally Mapped DCV Damper
Relay 2	To enable staged conditioning controls	Fan Low Speed
Relay 3	To enable staged conditioning controls	Aux Heating
Relay 4	To enable staged conditioning controls	Fan High Speed
Analog Out	To enable modulating conditioning controls	Water Modulating Valve	WaterModulating Valve Fan Speed Externally Mapped DCV Modulating Damper
Universal In	To enable the supply water temperature measurement	Supply Water Temperature	Supply Water Temperature

I/O Type	Purpose	Default Configuration	Configuration Options
Relay 1	To enable staged conditioning controls	Compressor Stage 1	Compressor Stage 1 Compressor Stage 2 Aux Heating Fan Low Speed Fan High Speed Fan Enable Occupied Enable Humidifier Dehumidifier 0 - Energize in Cooling B - Energize in Heating Externally Mapped DCV Damper
Relay 2	To enable staged conditioning controls	Aux Heating
Relay 3	To enable staged conditioning controls	Fan Low Speed
Relay 4	To enable staged conditioning controls	0 - Energize in Cooling
Analog Out	To enable modulating conditioning controls	Compressor Speed	Compressor Speed Fan Speed Externally Mapped DCV Modulating Damper
Universal In	To enable the supply water temperature measurement	Key Card Sensor (AI)	Supply Air Temperature Generic Alarm NO Generic Alarm NC Key Card Sensor (AI) Door/Window (N/C) - Title 24 Door/Window (AI)