What is a pneumatic thermostat?
Pneumatic thermostat is a device that uses a tube filled with air to control the air -conditioning or heating system. When the temperature is set, the thermostat responds to the temperature changes by reading the air pressure in the tube. If it is warmer than the set settings, the pressure level will start the system to activate until the air cools down to the desired temperature. The heating system is activated in the same way if the temperature is colder than the thermostat setting. When using a pneumatic thermostat, a mechanical or digital dial is rotated on the outside to set the range. Direct acting types of thermostats increase the pressure in the tube in proportion to the increase in temperature. In the opposite acting pneumatic thermostat, the pressure increases when the temperature increases, while the pressure increases. The controller serves as a connection between the pressure tube, the thermostat and the rest of the system. This interface can be an electronic circuit, controller or pneumatic-electric switch that has a direct or reverse configuration.
Thermostat problems include blockages in a restrictor or nozzle or calibration need. The inflow or exhaust valve may be clogged or connected to the control and power pressure perverted during the installation. Repair of the pneumatic thermostat, if the control pressure remains at zero, usually requires nozzle cleaning or recalibration of the device. It may also be necessary to replace the restrictions. If the control and supply pressure remains essentially the same, the dirt can be clogged with a jet or valve, so the blocking should be cleaned and the thermostat is calibrated again.
When the air escapes from the exhaust port of the pneumatic thermostat, then the connection to the delivery and return is often incorrect and need to be reinforced. The air entering into the thermostat should be clean. The pressure levels should also be constant at approximately 20 to 30 psi or pounds per square inch (about 1.7 to 2.1 bar). This can be measured using a test gaugeAlong with the needle adapter.
When maintaining and calibrating properly, the pneumatic thermostat will be appropriate to change the temperature. It also provides the required control to keep the thermometer to the necessary extent. The device can be used in summer or winter and its pressure levels can be set to activate heating or cooling systems as needed.