Claims
- 1. In combination:
- an electric motor driven dual capacity single refrigerant compressor which has a lower and a higher capacity automatically effected in accordance with the operating condition of the compressor; and
- a control system for controlling said operating condition of said compressor in accordance with temperature conditions, said control system including control means for effecting operation of the compressor in a low capacity condition in response to one range of temperature change needed to satisfy the served space temperature demand, and in high capacity condition in response to a greater range of temperature change needed to satisfy said demand, means delaying a restart of said compressor motor for at least a predetermined time in response to a condition of said control means operative to initiate a change in operating condition of said compressor when it restarts, and ambient temperature responsive means operative, in response to ambient temperature differing from the served spaced demand temperature by at least a predetermined degree, to prevent shifting of operation of said compressor from the high capacity condition to the low capacity condition.
- 2. In combination:
- an electric motor driven dual capacity single refrigerant compressor which has a lower and a higher capacity automatically effected in accordance with the operating condition of said compressor; and
- a control system for controlling said operating condition of said compressor in accordance with temperature conditions, said control system including control means for effecting operation of said compressor in a low capacity condition or alternatively in a high capacity condition in response to one set, and another set, respectively of temperature conditions, means delaying a restart of said compressor motor for at least a predetermined time in response to a condition of said control means operative to initiate a change in operating condition of said compressor when it restarts, and ambient temperature responsive means operative, in response to ambient temperature differing from the served space demand temperature by at least a predetermined degree, to prevent shifting of operation of said compressor from the high capacity condition to the low capacity condition.
- 3. In combination:
- an electric motor driven dual capacity single refrigerant compressor which has a lower and a higher capacity automatically effected in accordance with the operating condition of said compressor; and
- a control system for controlling said operating condition of said compressor in accordance with temperature conditions, said control system including control means for effecting operation of said compressor in a low capacity condition or alternatively in a high capacity condition in response to one set, and another set, respectively of temperature conditions, means delaying a restart of said compressor motor for at least a predetermined time in response to a condition of said control means operative to initiate a change in operating condition of said compressor when it restarts, said control means including:
- one thermostatic switch in the served space having a set point of one temperature corresponding to the served space demand temperature;
- a second thermostatic switch in the served space having a set point of a different temperature corresponding to a served space temperature more easily satisfied in accordance with whatever tempering operation is being carried out;
- said one thermostatic switch being operative to cycle said compressor on and off in a low capacity condition in response to the served space temperature ranging between said more easily satisfied temperature and a temperature beyond said set point temperature; and
- said second thermostatic switch being operative, with said first thermostatic switch closed, to cause said compressor to operate in a high capacity condition in response to a served space temperature not meeting said more easily satisfied temperature.
- 4. The combination of claim 3 wherein:
- said means delaying a restart comprises timer means controlling switch means having a high capacity compressor condition position and a low capacity compressor condition position, said timer means being connected to be energized by said first thermostatic switch to place said timer controlled switch in the low capacity position when only said first thermostatic switch is closed, and in the high capacity position when both said first and second thermostatic switches are closed.
- 5. The combination of claim 4 wherein:
- said timer means is connected in circuit means including energization-preventing-switch-means to effect parking of said timer means in one position and another position corresponding to said timer means controlled switch being in a high capacity condition position and a low capacity condition position, respectively.
- 6. The combination of claim 5 including:
- electrical resistance heaters and heater relay means for effecting energization of said heaters to add heat to the served space; and
- ambient temperature responsive switch means including one, normally-open switch in series with said heater relay and said second thermostatic switch, and a second, normally-closed switch in series with the circuit of said timer means energized to shift said timer controlled switch to a low capacity condition position.
- 7. The combination of claims 1 or 2 or 3 or 4 or 5 or 6 wherein:
- said electric motor is reversible;
- said compressor is of the reciprocating piston type; and
- said operating condition of said compressor effecting the lower and higher capacity is accomplished by reversal of said motor.
- 8. In combination:
- an electric motor driven dual capacity single refrigerant compressor which has a lower and a higher capacity automatically effected in accordance with the operating condition of the compressor; and
- a control system for controlling said operating condition of said compressor in accordance with temperature conditions, said control system including control means for effecting operation of the compressor in a low capacity condition in response to one range of temperature change needed to satisfy the served space temperature demand, and in a high capacity condition in response to a greater range of temperature change needed to satisfy said demand, means delaying a restart of said compressor motor for at least a predetermined time in response to a condition of said control means operative to initiate a change in operating condition of said compressor when it restarts, said control means including:
- one thermostatic switch in the served space having a set point of one temperature corresponding to the served space demand temperature;
- a second thermostatic switch in said served space having a set point of a different temperature corresponding to a served space temperature more easily satisfied in accordance with whatever tempering operation is being carried out;
- ambient temperature responsive switch means having a first condition when the ambient temperature differs from the served space demand temperature by at least a predetermined difference, and a second condition when the difference is less than said predetermined difference;
- said one thermostatic switch being operative to cycle said compressor on and off in a low capacity condition in response to the served space temperature ranging between said more easily satisfied temperature and a temperature beyond said set point temperature, and with said ambient temperature responsive switch means in said second condition; and
- operative to cycle said compressor on and off in a high capacity condition in response to the served space temperature ranging between said more easily satisfied temperature and a temperature beyond said set point temperature following a condition of both said space temperature not meeting said more easily satisfied temperature and said ambient temperature responsive switch means being in a first condition.
- 9. In combination:
- an electric motor driven dual capacity single refrigerant compressor which has a lower and a higher capacity automatically effected in accordance with the operating condition of said compressor; and
- a control system for controlling said operating condition of said compressor in accordance with temperature conditions, said control system including control means for effecting operation of said compressor in a low capacity condition or alternatively in a high capacity condition in response to one set, and another set, respectively of temperature conditions, means delaying a restart of said compressor motor for at least a predetermined time in response to a condition of said control means operative to initiate a change in operating condition of said compressor when it restarts, said control means including:
- one thermostatic switch in the served space having a set point of one temperature corresponding to the served space demand temperature;
- a second thermostatic switch in said served space having a set point of a different temperature corresponding to a served space temperature more easily satisfied in accordance with whatever tempering operation is being carried out;
- ambient temperature responsive switch means having a first condition when the ambient temperature differs from the served space demand temperature by at least a predetermined difference, and a second condition when the difference is less than said predetermined difference;
- said one thermostatic switch being operative to cycle said compressor on and off in a low capacity condition in response to the served space temperature ranging between said more easily satisfied temperature and a temperature beyond said set point temperature, and with said ambient temperature responsive switch means in said second condition; and
- operative to cycle said compressor on and off in a high capacity condition in response to the served space temperature ranging between said more easily satisfied temperature and a temperature beyond said set point temperature following a condition of both said space temperature not meeting said more easily satisfied temperature and said ambient temperature responsive switch means being in a first condition.
- 10. In combination:
- an electric motor driven dual capacity single refrigerant compressor which has a lower and a higher capacity automatically effected in accordance with the operating condition of the compressor; and
- a control system for controlling said operating condition of said compressor in accordance with temperature conditions, said control system including control means for effecting operation of the compressor in a low capacity condition in response to one range of temperature change needed to satisfy the served space temperature demand, and in a high capacity condition in response to a greater range of temperature change needed to satisfy said demand; and said control means includes:
- one thermostatic switch in the served space having a set point of one temperature corresponding to the served space demand temperature;
- a second thermostatic switch in said served space having a set point of a different temperature corresponding to a served space temperature more easily satisfied in accordance with whatever tempering operation is being carried out;
- ambient temperature responsive switch means having a first condition when the ambient temperature differs from the served space demand temperature by at least a predetermined difference, and a second condition when the difference is less than said predetermined difference;
- said one thermostatic switch being operative to cycle said compressor on and off in a low capacity condition in response to the served space temperature ranging between said more easily satisfied temperature and a temperature beyond said set point temperature, and with said ambient temperature responsive switch means in said second condition; and
- operative to cycle said compressor on and off in a high capacity condition in response to the served space temperature ranging between said more easily satisfied temperature and a temperature beyond said set point temperature following a condition of both said space temperature not meeting said more easily satisfied temperature and said ambient temperature responsive switch means being in a first condition.
CROSS REFERENCE TO RELATED APPLICATIONS
This application is a continuation-in-part of application Ser. No. 873,291, now abandoned filed Jan. 30, 1978 and assigned to the assignee of this invention.
US Referenced Citations (5)
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
873291 |
Jan 1978 |
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