Johnson Controls T-4002-125 Mounting

The Johnson Controls T-4002-125 is a professional-grade plastic surface mounting back designed specifically for the T-4000 Series pneumatic thermostats. Engineered for field applications where exposed tubing is required, this mounting bracket provides a stable, flush-mount foundation on drywall, masonry, or plaster walls. As a veteran technician knows, maintaining pneumatic control system integrity starts with a secure base that prevents air line leakage and protects the 5/32" OD poly tubing connections. This surface mount backplate facilitates seamless thermostat installation and is essential for high-volume or low-volume output models, such as the T-4002 single temperature thermostat. By providing a dedicated space for exposed tubing installations, the T-4002-125 ensures that the pneumatic feedback and bimetal sensing element operate within nominal specifications without mechanical interference. This part is a direct replacement for JCI pneumatic parts, maintaining the standard 2.1"H x 3.1"W footprint common in building automation systems (BAS).

Key Benefits

• Precise Fit: Specifically molded for T-4000 series instruments to ensure a flush, secure wall mount.
• Exposed Tubing Compatibility: Designed with integrated entry points to manage 5/32" polyethylene tubing without kinking.
• Rugged Construction: Durable plastic material resists the high-traffic demands of commercial HVACR environments.
• System Versatility: Supports both direct acting and reverse acting pneumatic thermostat configurations.
• Simplified Maintenance: Allows for quick instrument removal and inspection without disturbing the primary air line connections.

Common Questions Does this mounting back work with non-Johnson Controls thermostats? While optimized for the T-4000 Series, it can facilitate conversions for other pneumatic instruments with wall space requirements equal to or less than 3-1/16 in. x 2-1/32 in. Can I use this with 1/4" OD tubing? This back is designed for 5/32" OD tubing used in exposed tubing installations. If your trunk lines are 1/4", you must use 5/32" tubing couplers at the thermostat interface. Is this required for a standard wallbox installation? No, the T-4002-125 is specifically for surface mounting where tubing is run over the wall surface rather than inside the wall cavity.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.