What reading indicates a properly calibrated pneumatic thermostat at room temperature?

A properly calibrated pneumatic thermostat at room temperature typically indicates a reading of 8 psig. This standard reading correlates with the expected pressure output of the thermostat when controlling room temperature effectively.

Pneumatic thermostats operate by using air pressure to regulate temperature. At room temperature, they achieve a specific pressure that corresponds to a comfortable standard, with 8 psig being the calibrated reference point. Maintaining this pressure allows the thermostat to control the HVAC system efficiently, ensuring the desired environmental conditions.

In contrast to the other suggested pressures, they generally indicate either a higher or lower temperature setting or potential inconsistencies in calibration. Therefore, understanding the standard value of 8 psig is crucial for technicians when assessing the functionality and calibration status of pneumatic control systems.