Condition control device and system

Claim 2

In a control system for a refrigeration system having a compressor motor, a contactor for controlling said motor, said contactor having a switch controlling the motor and a coil, a condition responsive means, timing means having an electric timing motor for driving the same, a first timer-operated switching means connected in circuit with the contactor coil for energizing the same to start the compressor motor, a second timer-operated switching means connected to the timing motor, circuit means including the condition responsive means and the second timer switching means for causing operation of the timing motor upon call for a condition change by the condition responsive means, the timing means being arranged to actuate the first switching means a period of time thereafter, the circuit means being arranged to place the timing motor in series with the contactor coil and to complete a shunt circuit for the timing motor for stopping the same at a predetermined position when the contactor coil is energized, and to break the shunt circuit when the contactor coil is deenergized, providing the timing motor a starting circuit in series with the contactor coil.

Claim 3

The combination as defined in claim 1 in which the condition responsive means and the first timer switching means in series form part of the shunt circuit for the timing motor, and in which the second timer switching means provides a circuit to immediately restart the timing motor when the shunt circuit is broken, the first switching means being arranged to open a short period of time thereafter to delay restart of the compressor.

Claim 4

The combination as defined in claim 1 in which the shunt circuit includes a holding switch operated by the contactor, said holding switch being opened when the contactor coil is deenergized.

Claim 5

The combination as set forth in claim 1 in which the first timer switching means includes means independent of the timer motor for reopening said switching means instantly without movement of the timing motor, and in which the shunt circuit is maintained by a holding switch operated by the contactor.

Claim 6

The combination as defined in claim 1 in which the second timer switching means is arranged to place the timing motor either in series with or in parallel with the contactor coil.

Claim 7

The combination as set forth in claim 1 in which the second timer switching means establishes a shunt circuit for the condition responsive means so that the timing motor is restarted immediately when the contactor coil is deenergized, said second switching means returning the timing motor to control by the condition responsive means at a predetermined position of the timing means.

Claim 8

The combination set forth in claim 6 in which a third timer-operated switching means maintains the timing motor in operation for a period of time after the contactor is energized, and then places the timing motor in series with the contactor coil for stopping the timing motor until the contactor coil is deenergized.

Claim 9

The combination set forth in claim 6 in which refrigeration system includes a blower and in which a third switching means operated by the timing means controls the blower in a manner to start the blower at least by the time the compressor is started and to maintain the blower in operation for a period of time after the compressor is stopped.

Claim 10

The combination as set forth in claim 6 in which a safety controller responsive to an unfavorable condition associated with the refrigeration system is connected to deenergize both the contactor coil and timing motor, whereby the compressor is stopped in response to such unfavorable condition and the timer is prevented from timing as long as the unfavorable condition exists.

Claim 11

The combination as set forth in claim 8 in which a safety controller responsive to an unfavorable condition associated with the refrigeration system is connected to deenergize both the contactor coil and the timing motor as long as the unfavorable condition prevails, thus maintaining the blower in operation.

Claim 12

In a control system for a refrigeration system having a compressor motor, a contactor for controlling said motor, said contactor having a switch controlling the motor and a coil, means for controlling said contactor coil including a condition responsive means and a timing means having an electric timing motor, the condition responsive means being arranged to cause starting of the compressor motor on call for condition change, and to stop the compressor motor on call for condition change, and to stop the compressor motor when satisfied, and the timing means being arranged to provide a delay between stopping and restarting of the compressor motor, means for stopping the timing means at a first predetermined position in its cycle after the compressor motor is started, said last-named means including timer-operated switching means and circuit means placing the electric timer motor in series with the contactor coil and providing a shunt circuit for the timer motor when the contactor coil is deenergized, means independent of the condition responsive means for completing the energizing circuit to the timer motor when the contactor coil is deenergized causing the timer motor to start driving the timing means from said first predetermined position, and means for stopping said timing means at a second predetermined position.

Claim 13

In a control system for a refrigeration system having a compressor motor, a contactor for controlling said motor, said contactor having a switch controlling the motor and a coil, means for controlling said contactor coil including a condition responsive means and a timing means having an electric timing motor, the condition responsive means being arranged to cause starting of the compressor motor on call for condition change, and to stop the compressor motor on call for condition change, and to stop the compressor motor when satisfied, and the timing means being arranged to provide a delay between stopping and restarting of the compressor motor, means for stopping the timing means at a first predetermined position in its cycle after the compressor motor is started, said last-named means including timer-operated switching means and circuit means placing the electric timer motor in series with the contactor coil and providing a shunt circuit for the timer motor when the contactor coil is deenergized, means independent of the condition responsive means for completing the energizing circuit to the timer motor when the contactor coil is deenergized causing the timer motor to start driving the timing means from said first predetermined position, and means for stopping said timing means at a second predetermined position.

Claim 14

In a control system for a refrigeration system having a compressor motor, a contactor for controlling said motor, said contactor having a switch controlling the motor and a coil, means for controlling said contactor coil including a condition responsive means and a timing means having an electric timing motor, the condition responsive means being arranged to cause starting of the compressor motor on call for condition change, and to stop the compressor motor when satisfied, and the timing means being arranged to provide a delay between stopping and restarting of the compressor motor, means for causing operation of the timing motor and movement of the timing means for a predetermined time after the compressor motor is started for providing a variable delay between stopping and restarting of the compressor motor depending on the length of time the compressor motor operates, said last-named means including circuit means for the timing motor including switching means operated by the timing means at said predetermined time providing a power circuit for the timing motor in series with the contactor coil whereby the timing motor is shunted at said predetermined time if the contactor coil is energized, and the contactor coil provides a portion of an energizing circuit for the timing motor when the contactor coil is deenergized.

Claim 15

In a control system for a refrigeration system having a compressor motor, a contactor for controlling said motor, said contactor having a switch controlling the motor and a coil, means for controlling said contactor coil including a condition responsive means and a timing means having an electric timing motor, the condition responsive means being arranged to cause starting of the compressor motor on call for condition change, and to stop the compressor motor when satisfied, and the timing means being arranged to provide a delay between stopping and restarting of the compressor motor, means for causing operation of the timing motor and movement of the timing means for a predetermined time after the compressor motor is started for providing a variable delay between stopping and restarting of the compressor motor depending on the length of time the compressor motor operates, said last-named means including circuit means for the timing motor including switching means operated by the timing means at said predetermined time providing a power circuit for the timing motor in series with the contactor coil whereby the timing motor is shunted at said predetermined time if the contactor coil is energized, and the contactor coil provides a portion of an energizing circuit for the timing motor when the contactor coil is deenergized.

Claim 16

In a control system for a refrigeration system having a compressor motor, a contactor for controlling said motor, said contactor having a swiTch controlling the motor and a coil, means for controlling said contactor coil including a condition responsive means and a timing means having an electric timing motor, the condition responsive means being arranged to cause starting of the compressor motor on call for condition change, and to stop the compressor motor when satisfied, and the timing means being arranged to provide a delay between stopping and restarting of the compressor motor, means for causing operation of the timing motor and movement of the timing means for a predetermined time after the compressor is started for providing a variable delay between stopping and restarting of the compressor depending on the length of time the compressor operates, said last-named means including circuit means for the timing motor including switching means for operated by the timing means at said predetermined time providing a power circuit for the timing motor in series with the contactor coil whereby the timing motor is shunted at said predetermined time if the contactor coil is energized, and the contactor coil provides a portion of an energizing circuit for the timing motor when the contactor coil is deenergized, means independent of the condition responsive means for completing the energizing circuit to the timing motor when the contactor coil is deenergized causing the timing motor to start driving the timing means from the position it stopped when shunted, and means for stopping said timing means at a predetermined position.

Claim 17

In a control system for a refrigeration system having a compressor motor, a contactor for controlling said motor, said contactor having a swiTch controlling the motor and a coil, means for controlling said contactor coil including a condition responsive means and a timing means having an electric timing motor, the condition responsive means being arranged to cause starting of the compressor motor on call for condition change, and to stop the compressor motor when satisfied, and the timing means being arranged to provide a delay between stopping and restarting of the compressor motor, means for causing operation of the timing motor and movement of the timing means for a predetermined time after the compressor is started for providing a variable delay between stopping and restarting of the compressor depending on the length of time the compressor operates, said last-named means including circuit means for the timing motor including switching means for operated by the timing means at said predetermined time providing a power circuit for the timing motor in series with the contactor coil whereby the timing motor is shunted at said predetermined time if the contactor coil is energized, and the contactor coil provides a portion of an energizing circuit for the timing motor when the contactor coil is deenergized, means independent of the condition responsive means for completing the energizing circuit to the timing motor when the contactor coil is deenergized causing the timing motor to start driving the timing means from the position it stopped when shunted, and means for stopping said timing means at a predetermined position.

Claim 18

In a control system for a refrigeration system having a compressor motor, a contactor for controlling said motor, said contactor having a switch controlling the motor and a coil, a condition responsive means, timing means having an electric timing motor for driving the same, a first timer-operated switching means connected in circuit with the condition responsive means and the coil, said first timer switching means being arranged to close at a predetermined position of the timing means for energizing the contactor coil under the control of the condition responsive means, said first switching means also being arranged to be reopened by the timing means when it travels a short distance beyond said predetermined point, a second timer-operated switching means, one side of the timer motor being connected to said second switching means and the other side of the timer motor being connected to the contactor coil in a manner causing the contactor coil to form part of a power circuit for the timer motor, the second timer-operated switching means being arranged to connect said one side of the timer motor to the condition responsive means when in a first position and to provide a circuit for the timer motor shunting the condition responsive means when in a second position, said timing means being arranged to actuate said second switching means from its first position to its second position before closure of the first switching means, and to return the second switching means to its first position a period of time after opening of the first switching means.

Claim 19

In a control system for a refrigeration system having a compressor motor, a contactor for controlling said motor, said contactor having a switch controlling the motor and a coil, a condition responsive means, timing means having an electric timing motor for driving the same, a first timer-operated switching means connected in circuit with the condition responsive means and the coil, said first timer switching means being arranged to close at a predetermined position of the timing means for energizing the contactor coil under the control of the condition responsive means, said first switching means also being arranged to be reopened by the timing means when it travels a short distance beyond said predetermined point, a second timer-operated switching means, one side of the timer motor being connected to said second switching means and the other side of the timer motor being connected to the contactor coil in a manner causing the contactor coil to form part of a power circuit for the timer motor, the second timer-operated switching means being arranged to connect said one side of the timer motor to the condition responsive means when in a first position and to provide a circuit for the timer motor shunting the condition responsive means when in a second position, said timing means being arranged to actuate said second switching means from its first position to its second position before closure of the first switching means, and to return the second switching means to its first position a period of time after opening of the first switching means.