F - Mech Eng,Light,Heat,Weapons – 24 – F
Patent
F - Mech Eng,Light,Heat,Weapons
24
F
341/21
F24F 3/00 (2006.01)
Patent
CA 1038061
ABSTRACT OF THE DISCLOSURE A novel control circuit for heating and heating/cooling systems wherein in a heating mode the circuit controls a valve means comprising a main valve and a modulating valve through which gas is supplied to a burner. The main valve is a normally closed, solenoid-actuated type which opens when its coil is energized, and energization of its solenoid is controlled by a pair of normally open relay contact connected in series. One of the con- tacts closes when the temperature in the space being heated drops below a preset temperature. The other contact remains closed so long as the tem- perature in the space being heated remains below a maximum limit. In a heating/cooling system the circuit is selectively operatively coupled with the valve means and a refrigeration unit. When heating is selected, the circuit operates as mentioned above. In cooling, a cooling solenoid of the refriger- ation unit is energized when the temperature in the space being cooled rises above a preset temperature. A blower and blower control are also controlled such that the blower can operate either automatically whenever the refriger- ation unit operates or continuously in either heating, cooling, or off. The circuit can be installed with a minimum number of wires connecting the temperature settling and sensing control unit with the control circuit module, A feedback circuit in the control circuit prevents the control circuit from pulsing the refrigeration unit when the desired temperature in the space being cooled is reached.
272859
Mcmann Wilbur S.
Stang Charles (jr.)
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