Control unit and method for two-stage reciprocating compressor
AssigneeCarrier Corporation
InventorsRichard D. Dennis, Stephen C. Pederson
Life of this patent
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Abstract
A two stage compressor which provides a high capacity stage and a low capacity stage is used with multiple evaporator condensing units. A control system for controlling the compressor receives inputs from two indoor locations via thermostats. The compressor runs in the low capacity stage when cooling is called for from only one of the thermostats, but runs in the high capacity stage when cooling is called for from both of the thermostats. The control system controls the transition of the compressor from the low capacity stage to the high capacity stage, and from the high capacity stage to the low capacity stage.
Claims10
A control system for controlling a two stage compressor used with multiple evaporator condensing units, wherein said two stage compressor includes a low capacity stage and a high capacity stage, comprising:
- means for receiving input from first and second thermostats;
- means for controlling said compressor such that said compressor runs in said low capacity stage when cooling is called for from only one of said first and second thermostats, said high capacity stage when cooling is called for from both first and second thermostats simultaneously, and is off when no call for cooling is received from either first or second thermostats;
- first means for transitioning said compressor from said low capacity stage to said high capacity stage;
- and
- second means for transitioning said compressor from said high capacity stage to said low capacity stage.
A method for controlling a two stage compressor used with multiple evaporator condensing units, wherein said two stage compressor includes a low capacity stage and a high capacity stage, comprising the steps of:
- receiving input from first and second thermostats;
- controlling said compressor such that said compressor runs in said low capacity stage when cooling is called for from only one of said first and second thermostats, said high capacity stage when cooling is called for from both first and second thermostats simultaneously, and is off when no call for cooling is received from either first or second thermostats;
- transitioning said compressor from said low capacity stage to said high capacity stage;
- and
- transitioning said compressor from said high capacity stage to said low capacity stage.
Dependencies are inferred from the claim text.