Heating systems – Miscellaneous – Special liquid
Patent
1983-08-24
1987-07-14
Bennet, Henry A.
Heating systems
Miscellaneous
Special liquid
200 5EA, 361391, 361395, 361399, H01H 926, H05K 114
Patent
active
046797289
ABSTRACT:
An electrical control unit has specific application to central heating systems in which a plurality of electrical connections are to be made to the unit. The unit includes a backplate to which electrical connections may be made at a plurality of positions. A housing, containing control circuits and contacts for making connection between the circuit and the backplate connections, is removably attached to the backplate. Access to the electrical connections on the backplate for testing purposes may be achieved with the housing attached and electrically connected to the backplate, but a cover on the backplate may be positioned to prevent such access during normal operation of the unit. The unit also includes two control switches of which one is operable independently of the other or of which both are independently operable upon release of an interlock. The control circuits include a printed circuit board on which one side is printed. An L-shaped conductor effects electrical connection between the printed side of the circuit board and a display located at the unprinted side of the circuit board.
REFERENCES:
patent: 3796844 (1974-03-01), Osika
patent: 4172970 (1979-10-01), Grostean et al.
patent: 4268100 (1981-05-01), Kekas et al.
patent: 4325103 (1982-04-01), Ito et al.
patent: 4336569 (1982-06-01), Tsuda et al.
patent: 4558396 (1985-12-01), Kawabata et al.
Bennet Henry A.
Potterton International Limited
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