Description
The Johnson Controls T-4000-2146 is a beige-colored plastic cover designed for the vertical mounted pneumatic thermostat. It protects your thermostat while providing basic operations. This cover is not a thermostat but an outer decorative and protective part. Pneumatic thermostats work by utilizing air pressure to regulate the temperature. In the case of a change of temperature in the room bulk pressure inside the thermostat varies. This leads to changes in the HVAC system to regulate the temperature that you want. The T-4000-2146 cover is designed to be placed over the existing thermostat and it has the following advantages.
