Thermostat must be level

Heating · Venting Gas Furnaces · printed page 125 (PDF page 126)

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must be Level Thermostat

Text in the illustration

if the thermostat isn't level, the set temperature won't accurately reflect the actual room temperature
this can be checked with a level
55 60 65 70 75 80 85

Generated explanation

The illustration shows a mechanical thermostat with its internal spiral bimetal coil and mercury tilt switch visible. A numbered temperature scale and red adjustment lever are shown below the coil. A spirit level is held vertically against the side of the thermostat housing to check its alignment. The annotations explain that an out-of-level thermostat will not accurately match the set temperature to the actual room temperature.