Refrigeration system with delay timing mechanism

Claim 2

In a control system for a refrigeration system having an electric motor driven compressor, the combination of, a condition responsive device, timing means including an electric timing motor for driving the same and an electromagnet, a control circuit including the condition responsive device and electromagnet whereby the electromagnet is controlled by said condition responsive device, an energizing circuit for the electric timing motor, said energizing circuit being independent of said condition responsive device, a switch for controlling the compressor motor, means including the timing means and the electromagnet for closing said switch in response to a call for condition change by the condition responsive device, said timing means being arranged to delay closure of said switch for a predetermined minimum time, means for mechanically stopping said timing means at a point provIding said minimum time, said mechanical stopping means effectively stopping the timing means even though the electric timing motor remains energized by said independent energizing circuit, and means controlled by the condition responsive device including said electromagnet for rendering the mechanical stopping means ineffective and opening said switch when the condition responsive device calls for stopping the compressor.

Claim 3

The combination set forth in claim 1 in which a second condition responsive means breaks the energizing circuit for the electric timing motor and also deenergizes the electromagnet in response to an unfavorable condition associated with the refrigeration system, the duration of the unfavorable condition thus being added to said predetermined minimum delay.

Claim 4

The combination set forth in claim 1 in which the timing means provides a first delay period sufficient to allow equalization of pressure in the refrigeration system and an additional delay period in the event of a short cycle, said mechanical stopping means being arranged to allow operation of the timing means following starting of the compressor through said additional delay period and then to stop said timing means.

Claim 5

The combination set forth in claim 3 in which a second condition responsive means breaks the energizing circuit for the electric timing motor and also deenergizes the electromagnet in response to an unfavorable condition associated with the refrigeration system, the duration of the unfavorable condition thus being added to the delay provided by the timing means.

Claim 6

The combination set forth in claim 1 in which the refrigeration system includes a blower having a blower motor therefore, and a switch for the blower motor closed by said electromagnet in response to call for condition change by the condition responsive device.

Claim 7

In a control system for a refrigeration system having a compressor and a blower, a compressor motor for driving the compressor, a blower motor for driving the blower, a condition responsive means, an electromagnet, a control circuit including the condition responsive means and electromagnet whereby the condition responsive means controls the electromagnet, means including a compressor motor switch for controlling the compressor motor, means including a blower motor switch for controlling the blower motor, timing means including electric motor means, means for energizing said electric motor means, means actuated by the electromagnet for closing the blower motor switch on call for operation of the compressor by the condition responsive means, means including the timing means for causing closure of the compressor motor switch on call for compressor operation by said condition responsive means, said timing means being arranged to provide a delay between successive energizations of the compressor motor, means for stopping the timing means at a point providing said delay, means operated by the electromagnet on call for stopping of the compressor by the condition responsive means for opening the compressor motor switch, and means also operated by the electromagnet for rendering said stopping means ineffective, allowing the timing means to proceed with a new cycle.

Claim 8

In a control system for a refrigeration system having a compressor and a blower, a compressor motor for driving the compressor, a blower motor for driving the blower, a condition responsive means, an electromagnet, a control circuit including the condition responsive means and electromagnet whereby the condition responsive means controls the electromagnet, means including a compressor motor switch for controlling the compressor motor, means including a blower motor switch for controlling the blower motor, timing means including electric motor means, means for energizing said electric motor means, means actuated by the electromagnet for closing the blower motor switch on call for operation of the compressor by the condition responsive means, means including the timing means for causing closure of the compressor motor switch on call for compressor operation by said condition responsive means, said timing means being arranged to provide a delay between successive energizations of the compressor motor, means for stopping the timing means at a point providing said delay, means operated by the electromagnet on call for stopping of the compressor by the condition responsive means for opening the compressor motor switch, and means also operated by the electromagnet for rendering said stopping means ineffective, allowing the timing means to proceed with a new cycle.

Claim 9

The combination recited in claim 6 in which the blower motor switch is maintained closed by the timing means for a predetermined time following stopping of the compressor motor by said electromagnet.

Claim 10

The combination recited in claim 6 in which the timing means is restarted immediately following opening of the compressor motor switch by the electromagnet, and runs to a predetermined point, thereby shortening the delay before restart of the compressor during the time the compressor is stopped by the condition responsive means.

Claim 11

The combination recited in claim 6 in which the blower motor switch is maintained closed by the timing means until it has run for a predetermined length of time, and in which the energization of the electric motor means for the timing means is interrupteD in response to an unfavorable operating condition associated with the refrigeration system.