Combustion blower control for modulating furnace
First Claim
1. A forced air furnace comprising:
- a burner;
a pneumatically modulated gas valve configured to provide gas to the burner;
a combustion blower in fluid communication with the burner; and
a pneumatic sampling device disposed proximate the combustion blower, the pneumatic sampling device having a first pneumatic sampling port in fluid communication with the pneumatically modulated gas valve via a first pneumatic line for providing a first pneumatic signal directly to the pneumatically modulated gas valve, and a second pneumatic sampling port in fluid communication with the pneumatically modulated gas valve via a second pneumatic line for providing a second pneumatic signal directly to the pneumatically modulated gas valve, the first and second pneumatic signals collectively representative of fluid flow through the pneumatic sampling device, the pneumatically modulated gas valve regulating gas flow in accordance with the first and second pneumatic signals.
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Accused Products
Abstract
A forced air furnace may include a pneumatically modulated gas valve that is configured to provide gas to a burner. A pneumatic sampling device may be disposed proximate a combustion blower and may be configured to provide the pneumatically modulated gas valve with a first pneumatic signal and a second pneumatic signal that are representative of fluid flow through the pneumatic sampling device. The pneumatically modulated gas valve may regulate gas flow in accordance with the first and second pneumatic signals. In some cases, the pneumatic sampling device may include a restriction, a first pressure port disposed upstream of the restriction and a second pressure port disposed downstream of the restriction. The first and second pressure ports may provide the first and second pneumatic signals to the pneumatically modulated gas valve.
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Citations
21 Claims
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1. A forced air furnace comprising:
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a burner; a pneumatically modulated gas valve configured to provide gas to the burner; a combustion blower in fluid communication with the burner; and a pneumatic sampling device disposed proximate the combustion blower, the pneumatic sampling device having a first pneumatic sampling port in fluid communication with the pneumatically modulated gas valve via a first pneumatic line for providing a first pneumatic signal directly to the pneumatically modulated gas valve, and a second pneumatic sampling port in fluid communication with the pneumatically modulated gas valve via a second pneumatic line for providing a second pneumatic signal directly to the pneumatically modulated gas valve, the first and second pneumatic signals collectively representative of fluid flow through the pneumatic sampling device, the pneumatically modulated gas valve regulating gas flow in accordance with the first and second pneumatic signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A combustion appliance comprising:
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a burner; a pneumatically modulated gas valve configured to provide gas to the burner; a combustion blower having a combustion blower inlet; a restriction disposed in fluid communication with the combustion blower; a first pressure port disposed upstream of the restriction; and a second pressure port disposed downstream of the restriction; wherein the first pressure port and the second pressure port are in fluid communication with the pneumatically modulated gas valve, wherein the pneumatically modulated gas valve receives pressure signals directly from the first and second pressure ports. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A method of operating a modulating combustion appliance having a pneumatically modulated gas valve, a burner, a combustion blower and a collector box, the method comprising the steps of:
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delivering a first pneumatic signal from a first location downstream of the collector box directly to the pneumatically modulated gas valve via a first pneumatic sampling port and a first pneumatic line; delivering a second pneumatic signal from a second location downstream of the first location directly to the pneumatically modulated gas valve via a second pneumatic sampling port and a second pneumatic line; and controlling the pneumatically modulated gas valve to modulate gas flow to the burner based on the first pneumatic signal and the second pneumatic signal. - View Dependent Claims (20, 21)
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Specification