4 TR for R410A and 2 TR for R22

leading to a weak or non-existent spark

The Johnson Controls T-4000-2142 is a professional-grade horizontal pneumatic thermostat cover designed specifically for the T-4000 series

making it a staple for maintaining high-voltage air handlers and fan coil units

Built with a negative temperature coefficient (NTC) element

Schneider Electric (Barber Colman) 20-707 Guard Els PW 17895 4 TR for R410A andThe Schneider Electric (Barber Colman) 20 707 Guard is a heavy duty, 5 3 16 inch square cast metal guard designed to provide rugged physical protection for sensitive temperature control components. This industrial grade thermostat shield is specifically engineered to fit over 2x2 or 3x3 pneumatic or electric units, ensuring critical settings remain tamper proof in high traffic commercial or industrial environments. For technicians and facility