Daikin Industries, Ltd.

Goodman Global Group, Inc.

Shinichi Takahashi

Hideyuki Nakagawa

Cheng Li

Takahiro Yamada

Yuji Yamada

Akinori Nakai

A control system for a HVAC system for a structure and including a blower that flows air over an indoor heat exchanger. The control system may include a first input device, a first sensor, and a processor in electronic communication with the first input device, the first sensor, and the blower of the HVAC system. The first input device may be operable to accept a zoning mode selection. The first sensor may be sensor operable to measure a first temperature at a first location within the structure. The processor may be programmed to determine a cooling or heating demand on the HVAC system based on an input temperature and the first measured temperature. The processor may be further programmed to adjust an air flow rate produced by the blower based on the demand on the HVAC system and the zoning mode selection.

Control system for a heating, ventilation, and air-conditioning system

A refrigerant cycle apparatus includes a main refrigerant circuit, a bypass circuit, and a controller. The main refrigerant circuit includes a compressor, a heat source-side heat exchanger, a heat source-side expansion valve, and a utilization-side heat exchanger. The controller performs a second operation of opening a hot gas bypass valve in a state in which the compressor is driven before performing a first operation in which the heat source-side heat exchanger serves as a heat absorber for the refrigerant and the utilization-side heat exchanger serves as a radiator for the refrigerant. In the first operation or the second operation, when a difference between a pressure of the refrigerant on the discharge side of the compressor and a pressure of the refrigerant on the suction side of the compressor becomes larger than a first predetermined value, the controller decreases the number of revolutions of the compressor.

Refrigerant cycle apparatus

Growing community of inventors

Osaka, Japan

Shinichi Takahashi