A common error of occupants or
building custodians in response to a sense that the air
supplied by the unit ventilator is too cold is to increase
the setpoint on the low-limit thermostat, which prevents
free cooling from outside air or, on systems without a
cooling coil, prevents cooling altogether. Controls which
are subject to misadjustment by building occupants
should be placed so that they cannot be tampered with.
air from dropping below a preset temperature (usually
55 to 60°F; 13 to 16°C).