Electric heating – Heating devices – With power supply and voltage or current regulation or...
Patent
1975-05-01
1977-05-17
Bartis, A.
Electric heating
Heating devices
With power supply and voltage or current regulation or...
219321, 219364, 219493, 219511, 236 1E, 307 41, 337102, H05B 102, F24H 304, H02J 314
Patent
active
040243788
ABSTRACT:
An electrical circuit for a heating system has a plurality of electrical resistance heating elements and a blower all controlled by a plurality of electro-thermally actuated relays. The circuit is arranged so that the heating elements are sequentially energized and de-energized and so that the blower is maintained in operation at all times that any one of the heating elements is energized. A thermostat controls the operation of the relays, the second and the last of which each having switches connected in series circuits with the actuator of the first relay and in parallel with the thermostat so as to maintain blower operation, which is controlled by the first relay, when the thermostat opens.
REFERENCES:
patent: 2958755 (1960-11-01), Miller
patent: 3046380 (1962-07-01), Carlson
patent: 3353000 (1967-11-01), Tomlinson
patent: 3586822 (1971-06-01), Pastore
patent: 3588471 (1971-06-01), Chambers
patent: 3606970 (1971-09-01), Kompelien
patent: 3659155 (1972-04-01), Chambers
patent: 3770977 (1973-11-01), McIntosh
patent: 3912906 (1975-10-01), McIntosh et al.
Bartis A.
Robertshaw Controls Company
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