this heavy-duty replacement spring provides a reliable 4-8 psi operating range

This high-impact

What causes these coils to burn out

Safety Compliance: SPNC Open on Rise logic prevents ignition if venting or intake blockages are detected

Component Protection: Seals the internal adjustment mechanism from dust

Johnson Controls T-4756-2145 Plastic Cover this heavy-duty replacement spring providesThe Johnson Controls T 4756 2145 Plastic Cover is a high durability replacement faceplate designed specifically for T 4000 Series Pneumatic Room Thermostats. This beige, vertically mounted cover is engineered for dual temperature applications, featuring 2 setpoint windows to allow for clear visibility of heating and cooling dials. As a veteran grade HVAC pneumatic accessory, it provides a clean, professional finish for T 4756 heating cooling