F - Mech Eng,Light,Heat,Weapons – 24 – H
Patent
F - Mech Eng,Light,Heat,Weapons
24
H
237/20, 309/32
F24H 3/04 (2006.01) F24D 5/02 (2006.01) F24D 19/10 (2006.01) F24H 1/22 (2006.01) H05B 1/02 (2006.01)
Patent
CA 1152549
-0- ELECTRIC HEATING SYSTEM WITH PROPORTIONAL TIMER HAVING A CYCLE OF FIXED DURATION Abstract of the Disclosure A heating system comprising a closed conduit containing a liquid which is continuously circulated through the conduit by a pump. An electrical resist- ance heating unit serves to heat the liquid in the con- duit and heat is transferred from the liquid through a heat exchanger to a medium to be heated. A proportional timer is operably connected in the electrical circuit with the heating unit. The timer has a cycle of fixed duration composed of an "on" interval and an "off" interval, with the duration of the "on" interval being variable within the cycle. A temperature sensor senses the tempera- ture of the liquid in the conduit and if the temperature falls below a set value, the sensor acts to operate the timer and energize the heating unit. A second tempera- ture sensor acts to adjust the "on" interval of the timing cycle in proportion to the deviation of the liquid temperature from the temperature setting. -0-
357461
Marks & Clerk
Partington Everett J.
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