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  • STI Thermostat Protector Series — Install Instructions (STI-9102/9105/9110/9115/9116)

    September 08, 2026 2 min read

    Installation instructions for the STI Thermostat Protector Series polycarbonate thermostat covers.

    Full text manual (for reference)

    Installation instructions for the STI Thermostat Protector Series (STI-9102, STI-9105, STI-9110, STI-9115, STI-9116) polycarbonate thermostat covers.

    Installation Instructions

    1. Do not remove the thermostat. Prior to drilling anchor holes, cover the thermostat with a damp cloth to prevent dust from penetrating the sensor.
    2. Center the frame over the existing thermostat. Mark and drill (4) anchor holes using a 1/4 in. (6.3mm) drill bit. Insert the (4) anchors and complete installation as shown. Note: the (3) tabs on the frame must face upward.
    3. Insert the (3) slots on the cover over the tabs on the top surface of the frame. Rotate the cover downward onto the frame and turn the key to lock.

    Cleaning Instructions

    To clean the cover, remove it from the wall. Rinse with water to remove abrasive dust and dirt. Wash with soap or mild detergent using a soft cloth — do not scrub. Rinse once more, then dry with a soft cloth or chamois. To remove grease or wet paint, gently rub with a cloth wetted thoroughly with naphtha, then wash and rinse.

    Hardware Included

    • (4) anchors
    • #10 x 1-1/2 in. Phillips pan head screws (4, provided) or #8 flat washer head screw (4, provided) depending on model
    • (2) keys for lock assembly

    Warning

    This product can expose you to chemicals including Dichloromethane, which is known to the State of California to cause cancer, and Bisphenol A (BPA), which is known to the State of California to cause birth defects or other reproductive harm. For more information, visit www.P65Warnings.ca.gov.

    Warranty

    Three-year warranty, or a one-year limited warranty (from date of purchase) on most products. See website for details. Electronic warranty form available at www.sti-usa.com/wc14.

    Manufacturer: Safety Technology International (STI) · 2306 Airport Road, Waterford, MI 48327, USA · 248-673-9898 · info@sti-usa.com · www.sti-usa.com