Method for controlling indoor coil freeze-up of heat pumps and a

Details Method for controlling indoor coil freeze-up of heat pumps and a Method for controlling indoor coil freeze-up of heat pumps and a

1990-09-18

1991-11-19

Tanner, Harry B.

Refrigeration

Automatic control

Of external fluid or means

62156, 62227, 622284, 62186, F25D 2106

Patent

active

050655930

ABSTRACT:
A heat pump diagnostic and control system for controlling indoor coil freeze-up when in the cooling mode is provided. A low indoor coil temperature is sensed, the indoor fan speed is increased in steps up to a maximum to thaw the frost on the indoor coil. If this is not sufficient, the compressor speed is then reduced in steps until it is turned off and if necessary, it is held off until such time as the temperature sensor indicates thawing of the indoor coil of the heat exchanger. Diagnostic flow chart and control circuitry for accomplishing this control are disclosed.

REFERENCES:
patent: 3559422 (1971-02-01), Holzer
patent: 3823572 (1974-07-01), Cochran, Jr.
patent: 4027497 (1977-06-01), Thurman
patent: 4132086 (1979-01-01), Kountz
patent: 4171621 (1979-10-01), Trelease
patent: 4308042 (1981-12-01), Ecker
patent: 4407139 (1983-10-01), Ide et al.
patent: 4507932 (1985-04-01), Suzuki et al.

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