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  • HAI Model 23A00-2 Flush Remote Temperature Sensor — Installation Instructions

    September 08, 2026 2 min read

    Installation instructions for the HAI 23A00-2 Flush Remote Temperature Sensor, used with RC-Series Omnistat thermostats to monitor temperature from a remote location.

    Full text manual (for reference)

    Installation instructions for the HAI Model 23A00-2 Flush Remote Temperature Sensor, used with RC-Series Omnistat thermostats to monitor temperature from a remote location.

    Description

    The Model 23A00-2 is a flush-mount temperature sensor that installs alongside your existing RC-Series Omnistat to monitor temperature from a remote location. This allows a customer to monitor the temperature of an area without a thermostat being visible — the thermostat (or group of thermostats) can be located elsewhere, giving complete control of temperatures from a different room.

    Installation Steps

    1. Install the Omnistat base in the selected thermostat location and connect it to heating/cooling equipment per the manufacturer's instructions. Connect the thermostat to the base and confirm everything operates correctly.
    2. Disconnect the thermostat from the base. Locate the 3 solder holes on the lower right side of the thermostat PCA marked J4. Using a clean soldering iron and safety glasses, carefully solder the supplied connector to these solder holes.
    3. Choose a mounting location for the Remote Temperature Sensor, avoiding areas where studs, plumbing, or electrical wiring may be behind the wallboard. Hold the base of the plastic case against the wall, trace around its perimeter with a pencil, and carefully cut along the line. Do not oversize this cut-out.
    4. Run a twisted pair, shielded cable from the Omnistat to the Remote Temperature Sensor location.
      • Up to 100 ft: typical twisted pair, PVC-insulated, shielded cable.
      • 100–150 ft: twisted pair with polypropylene-insulated conductors, shielded.
      • 150–250 ft: twisted pair with foam-polyethylene insulated conductors, shielded.
      • Wire runs must not exceed 250 feet.
    5. Connect the data wires of the shielded cable to the green data wires of the temperature sensor using the supplied wire splices. Wrap the shield around the jacket of the cable and tape.
    6. Insert the Remote Temperature Sensor base into the cutout in the wall.
    7. At the Omnistat location, connect the Black conductor of the supplied cable to the shield using the supplied wire splices. Connect the Green conductors of the supplied cable to the data wires using the supplied wire splices.
    8. Carefully clip off the existing thermistor (temperature sensing device) from the thermostat using wire cutters.
    9. Connect the supplied cable to the installed connector (J4) on the Omnistat.
    10. Reconnect the thermostat to the base and confirm the thermostat displays the proper temperature.

    Manufacturer

    Home Automation, Inc. — 5725 Powell Street, Suite A, New Orleans, LA 70123. Phone: 504-736-9810. Fax: 504-736-9890.