Patent ID: 9032991
Filing Date: 2015-05-19
Classification: F23N,G05D,Y10T

Abstract:
1. A gas valve unit for controlling a gas flow rate to a combustion apparatus, the gas valve unit comprising: a valve member moveable relative to a valve seat, wherein an input signal to a coil controls the extent of movement of the valve member relative to the valve seat to control a gas flow rate through the gas valve unit to the combustion apparatus; a setting adjustment device that provides a setting adjustment input for calibrating at least one gas flow rate manufacturer-set in the gas valve unit; and a valve controller in communication with the setting adjustment device and the coil, the valve controller being configured to receive an activation signal prompted by a thermostat and to responsively send the input signal to the coil to move the valve member to establish at least one desired gas flow rate corresponding to the activation signal; the valve controller further configured to use a first value of the setting adjustment input from the setting adjustment device to calibrate a manufacturer-set high-capacity gas flow rate to obtain a calibrated high-capacity gas flow rate for a gas, and to use a second value of the setting adjustment input from the setting adjustment device to calibrate a manufacturer-set low-capacity gas flow rate to obtain a calibrated low-capacity gas flow rate for the gas, where in a single calibration, calibrating one of the high-capacity gas flow rate and the low-capacity gas flow rate is not effective to calibrate the other of the high-capacity gas flow rate and the low-capacity gas flow rate; the valve controller further configured to: