UTICA BOILERS MGC-8D Installation, Operation And Maintenance Manual page 21

CHECK THERMOSTAT OPERATION
A. When set above temperature indicated on
thermostat, boiler should ignite.
B. Verify thermostat turns boiler off when room
temperature reaches selected setting and starts
boiler operating when room temperature falls a
few degrees.
C. After setting limit control to limit setting, check to
see if it shuts off gas supply to burners. Turn your
thermostat up to call for heat and let boiler run
until temperature of water reaches limit setting.
Gas valve should shut off and circulator running
until thermostat is satisfied, or water cools enough
to restart burners through limit control.
D. Set thermostat for desired temperature. Conditions
in your home and location of thermostat will govern
this setting.
14 - OPERATING YOUR BOILER
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P/N , Rev. C [07/22/2015]