Water chiller-heater unit and control method thereof

Abstract

The embodiment of the invention provides a water chiller-heater unit and a control method of the water chiller-heater unit and relates to the field of air conditioners. The water chiller-heater unit solves the problem that in the prior art, when a water chiller-heater unit conducts refrigeration, because a balance tank cannot store a refrigerant and the outdoor environment temperature is too high or the indoor load is too low, the water chiller-heater unit gives a high pressure alarm. According to the water chiller-heater unit, a first electromagnetic valve, a second electromagnetic valve, a balance tank connected with an electronic expansion valve in parallel and a controller are additionally arranged in a traditional unit; and the first electromagnetic valve controls the flow direction of a refrigerant in a communicating pipe between the balance tank and a shell and tube heat exchanger, the second electromagnetic valve controls the flow direction of the refrigerant in the communicating pipe between the balance tank and a finned heat exchanger, and the controller controls the first electromagnetic valve to be opened and the second electromagnetic valve to be closed or controls the first electromagnetic valve to be closed and the second electromagnetic valve to be opened according to the operation mode of the water chiller-heater unit and the exhaust pressure of a compressor in a compression assembly. The water chiller-heater unit and the control method are used for production and control of water chiller-heater units.

Description

technical field [0001] The invention relates to the field of air conditioning, in particular to a cold and hot water unit and a control method for the cold and hot water unit. Background technique [0002] At present, the hot and cold water unit is more and more favored by consumers, and it realizes raising and lowering the indoor air temperature by entering the hot water and cold water into the indoor pipeline. Specifically, when the cold and hot water unit is cooling, the water in the water inlet pipe of the cold and hot water unit exchanges heat with the refrigerant with a lower temperature, so that the water outlet pipe of the cold and hot water unit outputs cold water, and the cold water enters the Indoor pipes to reduce the indoor air temperature; when the chiller and hot water unit is heating, the water in the water inlet pipe of the chiller and hot water unit exchanges heat with the refrigerant with a higher temperature, so that the water in the outlet pipe of the ch...

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Problems solved by technology

[0005] The embodiment of the present invention provides a cold and hot water unit and a control method of the cold and hot water unit, which solves the problem that when the cold and hot water unit in the prior art is cooling, the balance tank cannot store refrigerant and the outdoor environment temperature is too high or the indoor The problem of high pressure alarm phenomenon of cold and hot water units caused by too low load

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