Advanced proof-of-rotation switch

Details Advanced proof-of-rotation switch Advanced proof-of-rotation switch

1991-08-21

1993-06-29

Price, Carl D.

Combustion

Timer, programmer, retarder or condition responsive control

Of or by exhaust damper or exhaust pump

431 12, 431 18, F23N 300

Patent

active

052228886

ABSTRACT:
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.

REFERENCES:
patent: 4298334 (1981-11-01), Clark et al.
patent: 4412328 (1983-10-01), Homa
patent: 4421268 (1983-12-01), Bassett et al.
patent: 4752210 (1988-06-01), Trent
patent: 5076780 (1991-12-01), Erdman

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