F - Mech Eng,Light,Heat,Weapons – 24 – H
Patent
F - Mech Eng,Light,Heat,Weapons
24
H
126/18
F24H 3/02 (2006.01) F24D 5/00 (2006.01)
Patent
CA 1227710
ABSTRACT OF THE DISCLOSURE A dual sensing device is disclosed for use in a furnace having: an exterior housing, at least one primary heat exchanger, a condensing heat exchanger in fluid communication with said primary heat exchanger, exhaust means communicating with the condensing heat exchanger, and an induced draft blower. The dual sensing device detects either a change in combustion gas flow rate and/or a predetermined condensate level within drainage means of the condensing heat exchanger. The dual sensing device has a hollow tube configured within the furnace housing to extend from an electrical pressure switch, capable of transducing a change in fluid pressure into an electrical signal, to a region within the condensing heat exchanger where condensate is pooled and drained from the heat exchanger The tube has an open sensing end oriented at a predeter- mined point where the condensate level is to be detected within the condensing heat exchanger so that condensate reaching the predetermined point will seal the open sensing end. A transmitting end of the tube transmits any fluid pressure change detected by the sensing end to the elect rical pressure switch. A vent communicates the interior of the tube with the exterior of the tube. The dual sensing devices provide for safe shut down in the event of furnace malfunction.
518440
Hwang Kyu S.
Koestler Dennis J.
Duo-Matic/olsen Inc.
Riches Mckenzie & Herbert Llp
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