Control of staged heating and cooling apparatus by a four-wire t

Details Control of staged heating and cooling apparatus by a four-wire t Control of staged heating and cooling apparatus by a four-wire t

1990-02-09

1991-06-11

Ford, John K.

Heat exchange

With alarm, indicator, signal, register, recorder, test or...

Remotely controlled inspection means

165 24, 165 26, 236 1C, 236 51, F25B 2900, G05D 2300

Patent

active

050224603

ABSTRACT:
A heating and cooling apparatus wherein either or both the heating apparatus and cooling apparatus are two-stage is controlled by a thermostat through four connecting wires. A signal on one of the wires enables the functions of controlling operation of the circulator fan and controlling second-stage operation of whichever apparatus is two-stage.

REFERENCES:
patent: 3605877 (1971-09-01), Isaacs et al.
patent: 3815668 (1974-06-01), Carlson
patent: 3993120 (1976-11-01), Iberg et al.
patent: 4083397 (1978-04-01), Kimpel et al.
patent: 4632304 (1986-12-01), Newell, III et al.
patent: 4828016 (1989-05-01), Brown et al.
patent: 4889179 (1989-12-01), Merenda

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