Advanced proof-of-rotation switch

F - Mech Eng,Light,Heat,Weapons – 24 – F

Patent

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Details

F24F 11/00 (2006.01) F23N 3/08 (2006.01) F23N 1/00 (2006.01) F23N 1/06 (2006.01) F23N 5/24 (2006.01)

Patent

CA 2061115

A HVAC system (10) employs a gas valve (20) to supply gas for combustion within a heating portion (12) of the system. An exhaust (22) removes combustion products using a motor (28) driven exhaust fan (24). An apparatus (34) controls combustion and uses a sensor (36) for sensing the rotational speed of a motor shaft (26). A switch (T1) is responsive to sensed motor speed to open and close the valve, the valve being opened only if the motor is operating within a predetermined speed range. A first speed discriminator (48A) enables of the switch to open the valve when the motor speed exceeds a first predetermined value. A second speed discriminator (48B) disables the switch to close the valve when motor speed exceeds a second and higher predetermined speed which is indicative of a blocked exhaust, or a fan blade is loose. This latter action insures that a build-up of potentially dangerous exhaust gases cannot occur.

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