Low fire start control
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United States of America Patent
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-
Aug 4, 2009
Grant Date -
Jan 2, 2003
app pub date -
Aug 19, 2002
filing date -
May 20, 1999
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A direct gas-fired industrial air heater low fire start control, includes circuitry for simulating a resistant circuit which bypasses the discharge temperature sensors, the remote temperature selector, and a space temperature controls, that has the effect of driving the modulating valve to a fixed open setting which in turn changes the valve voltage in order to obtain desired gas flow. In a further embodiment, an isolated DC voltage source which normally bypasses the voltage input to the system of the modulating valve can be inserted into the circuitry to effectively drive the modulating valve to a fixed open setting to obtain the desired gas flow rate. Various circuitry, and bypass gas flow arrangements, are further shown to increase the efficiency of ignition of the burner assembly, when started.
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