Fan cycling means of head pressure control

Details Fan cycling means of head pressure control Fan cycling means of head pressure control

1991-03-18

1993-09-28

Tanner, Harry B.

Refrigeration

Automatic control

Of external fluid or means

62DIG17, F25B 3904

Patent

active

052478050

ABSTRACT:
In a heat pump system intended for cooling operation at lower ambient conditions, a control is provided for sensing the compressor discharge pressure and for alternately providing power to and removing power from the outdoor fan in response to the discharge pressure respectively exceeding or falling below a predetermined level. Power is provided to and removed from the motor by way of a solid state relay, and the periods in which power is removed are controlled so as to exceed those periods in which the power is applied to the motor. The fan motor is supported by journal bearings, and the periods of time in which power is removed from the motor during the cycling process is limited to 10 seconds such that the motor does not come to a complete stop, thereby ensuring proper lubrication thereto.

REFERENCES:
patent: 2943457 (1960-07-01), Wile et al.
patent: 3354665 (1967-11-01), Lewis
patent: 4507933 (1985-04-01), Chapa et al.

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