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Technicians should look for visible media leakage around the packing nut
Secures the adjustment screw to maintain consistent outlet pressure set-points
meaning it will restore the circuit once the plenum temperature cools back to the 180F differential
Bearing Protection: Prevents moisture migration down the shaft into the motor housing
Johnson Controls T-4000-3141 Plastic Cover Technicians should look for visibleThe Johnson Controls T 4000 3141 is a commercial grade pneumatic thermostat cover designed for horizontal mounting configurations within HVAC control systems. Engineered for T 4000 series thermostats, this white plastic enclosure features a single setpoint window to allow for clear visibility of calibration without compromising the protection of the internal bimetal sensing elements. The unit is designed with a clean, low profile aesthetic featuring
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