temp control on gas furnace

A

Thread Starter

ashley

i have a question on valve calibration that is done on line ie, the valve limits 0% and 100 % are set when the flow meter (dp cell and orifice plate) start reading flow (valve position 10 % when the flowmeter starts measuring flow)
and when the flow no longer increases (the valve stroke is 80 %).

so instead of operating the valve from 0 -100 % u operate at 10 - 80 %.

Is this a good practice, or is this type of method just hiding incorrect calibration issues
 
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