Furnace header box having blocked condensation protection, a furnace including the header box and a blocked condensation protection system

Patent metadata

Field	Value
Publication number	US-9429338-B2
Application number	US-83439110-A
Country	US
Kind code	B2
Filing date	Jul 12, 2010
Priority date	Jan 15, 2010
Publication date	Aug 30, 2016
Grant date	Aug 30, 2016

Abstract

A header box, a furnace and a blocked condensation protection system are disclosed herein. In one embodiment, the header box includes: (1) a first channel having a first channel supply port positioned to be in fluid communication with an inlet of a combustion air blower and a first pressure port couplable to a first input of a pressure sensing device, the combustion air blower and the pressure sensing device associated with the cold end header box and (2) a second channel having a second channel supply port positioned to be in fluid communication with the inlet of the combustion air blower, a second pressure port couplable to a second input of the pressure sensing device and a pressure reference inlet, the second channel in fluid communication with the first channel and configured to have about a same pressure as the first channel when the pressure reference inlet is blocked.

First claim

What is claimed is:

1. A cold end header box of a furnace, comprising:
a first channel having a closed end, an open end, a first channel supply port positioned to be in fluid communication with an inlet of a combustion air blower, and a first pressure port couplable to a first input of a pressure sensing device, said combustion air blower and said pressure sensing device couplable to said cold end header box;
a second channel having a closed end, an open end, a second channel supply port positioned to be in fluid communication with said inlet of said combustion air blower, a second pressure port couplable to a second input of said pressure sensing device, and a pressure reference inlet, said second channel in fluid communication with said first channel;
a fixed orifice located entirely outside of said first channel and said second channel;
wherein said first channel supply port and said second channel supply port are different ports and are both located entirely within an area of said inlet of said combustion air blower; and
wherein said first supply port is adjacent said closed end of said first channel and said second pressure port is adjacent said closed end of said second channel.

2. The cold end header box as recited in claim 1 further comprising a support collar for coupling said cold end header box to said combustion air blower, wherein said support collar corresponds to said inlet of said combustion air inducer.

3. The cold end header box as recited in claim 1 , wherein said second channel is configured to have a positive pressure at said second pressure port compared to a pressure of said first channel at said first pressure port during operation of said combustion air blower when said pressure reference inlet is not blocked.

4. The cold end header box as recited in claim 1 , wherein said second channel and said first channel are configured to have about a same pressure at said second pressure port and at said first pressure port when said pressure reference inlet is blocked when said furnace is in multiple installation positions.

5. The cold end header box as recited in claim 1 further comprising a first drain in fluid communication with said pressure reference inlet and configured to drain condensation away from said cold end header box.

6. The cold end header box as recited in claim 5 further comprising a second drain in fluid communication with said pressure reference inlet and configured to drain condensation away from said cold end header box, wherein said second drain is located at an opposing side of said first drain.

7. The cold end header box as recited in claim 1 further comprising two drains configured to drain condensation away from said cold end header box when said furnace is installed in a horizontal position, wherein one of said two drains is used to drain condensation away from said cold end header box when said furnace is installed in an upright position.

8. The cold end header box as recited in claim 1 , wherein said pressure reference inlet is an open end of said second channel that faces a side of said cold end header box having two drains.

Assignees

• Kowald Glenn W
• Paller Hans J
• Lennox Ind Inc

Inventors

• Kowald Glenn W
• Paller Hans J

Classifications

• F23D14/58

  characterised by the shape or arrangement of the outlet or outlets from the nozzle, e.g. of annular configuration · CPC title

• F25D21/14

  Collecting or removing condensed and defrost water; Drip trays · CPC title

• F24H8/006

  Means for removing condensate from the heater · CPC title

• Y10T137/4463

  Liquid seal in liquid flow line; flow liquid forms seal · CPC title

• Y10T29/49348

  Burner, torch or metallurgical lance making · CPC title