F - Mech Eng,Light,Heat,Weapons – 24 – D
Patent
F - Mech Eng,Light,Heat,Weapons
24
D
341/21
F24D 19/10 (2006.01) F24D 3/00 (2006.01) F24H 9/20 (2006.01)
Patent
CA 1149906
ABSTRACT OF THE DISCLOSURE An electric control device for a central heating boiler which is provided with a water pump or an air ventilator, a burner with an electrically operated shut-off valve and an electric control circuit comprising a supply transformer and a series circuit connected to the secondary winding of said transformer and composed of the control winding of the shut-off valve, the contact of a room or regulator thermo- stat and, if present, the contact of a maximum thermostat and in which the water pump or air ventilator is connected in parallel with the primary winding of the supply trans- former. The control device comprises a circuit to be con- nected to the contact of the room or regulator thermostat including a high resistance value series resistor to be connected into the mains supply circuit of the boiler, a relay with a normally open contact connected in parallel to said series resistor and means for controlling the relay in such manner that the water pump or air ventilator is put into operation only upon the closing of the contact of the room or regulator thermostat and the opening of the con- tact of the maximum thermostat respectively through the closing of the contact of the relay.
354329
Overman Paulus T.j.
Slats Henricus J.
Marks & Clerk
Veg-Gasinstituut N.v.
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