Johnson Controls T-4000-3139 Plastic Cover obstructed ductwork

obstructed ductwork

Precise 210°F Setpoint: Fixed temperature calibration prevents drifting

ensuring accurate temperature sensing is not compromised

the BT1256502 fan relay is a frequent failure point due to pitted contacts or a failed coil

technicians can maintain optimal burner efficiency and safe combustion performance during system commissioning or routine troubleshooting

Johnson Controls T-4000-3139 Plastic Cover obstructed ductworkThe Johnson Controls T 4000 3139 is a professional grade horizontal pneumatic thermostat cover designed specifically for the T 4000 Series room thermostats. Engineered for demanding commercial environments, this white plastic cover provides a clean, uniform look for horizontal mounted controllers where a blank faceplate cover is required. As a genuine Johnson Controls replacement part, it ensures a precise fit for single or dual element sensing units