To calibrate a pneumatic thermostat, what should the pressure read when the stat is set to room temperature?

When calibrating a pneumatic thermostat, the correct pressure reading at the setting corresponding to room temperature is typically 8 psig. This pressure aligns with standard pneumatic control system specifications, ensuring that the thermostat can effectively respond to the ambient temperature of the environment.

Pneumatic systems rely on air pressure to convey the temperature conditions, and the calibration ensures that the thermostat accurately represents the desired room temperature based on the pressure it reads. If the system is set to the expected room temperature, achieving a reading of 8 psig verifies that the system is functioning properly within its designed parameters.

Other pressure readings such as 10 psig, 6 psig, or 12 psig do not correspond to the standard calibration benchmarks for room temperature settings in pneumatic thermostats. Each of these figures would imply a deviation from the norm, potentially indicating an improper calibration or malfunction within the system. Hence, achieving 8 psig at room temperature is essential for optimal thermostat performance.