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| Overview

The MyStat thermostat is designed to be compatible with most HVAC systems that operate with standalone heating and cooling. It uses industry-standard connections to control these appliances effectively.

This versatile device can manage single-stage heating or cooling with a fan, or up to three stages of either heating or cooling, thanks to its four onboard relays. It utilizes the 75F proprietary RF communication, ensuring seamless integration with existing 75F solutions. Additionally, the MyStat can function in standalone mode, programmable via a Central Control Unit (CCU).

Equipped with an occupancy sensor, as well as temperature and humidity sensors, the MyStat enables demand-controlled conditioning of the specific zone it manages, optimizing comfort and efficiency.

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| Features

  • Onboard Relays: 4 relays available.
  • Analog Outputs: 1 output.
  • Universal Input: 1 input.
  • Energy Efficient: Advanced occupancy sensing optimizes comfort and reduces energy waste.
  • Compact Design: MyStat is adaptable for various HVAC setups, offering reliable control without intrusive equipment.
  • Integration: Seamlessly fits into the 75F ecosystem via a robust wireless mesh network.
  • Enhanced Connectivity: Includes RS485 communication for wired BACnet and Modbus integration, plus support for wireless door/window sensors.
  • Effortless Updates: Over-the-air firmware updates through the 75F Central Control Unit (CCU).
  • Low Power Consumption: Designed to minimize energy usage for sustainable operation.

| Compatible Applications

  • 2 Pipe Fan Coil Unit
  • 4 Pipe Fan Coil Unit
  • Rooftop Package Unit
  • Heat Pump Unit

| 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.

| Mounting instructions

  • Position the MyStat mounting plate and the back plate (if the gang box is vertically fixed) over the gang box. Ensure the back plate covers the gang box completely, then secure both plates to the wall gang box using the PHP screws provided.

  • Align the MyStat top plastic with the mounting plate and push it to lock into place.

  • Use the socket head screw provided in the box to secure the MyStat to the mounting plate.

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1. Mystat

4. Gang Plate 1

2. Mounting Screws

5. Gang Plate 2

3. Mounting Plate

6. Gang Box

 

| Dis-Assembling

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

 

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