| 摘要 |
PURPOSE:To reduce complexity and permit refrigerant control of inexpensive cost by a method wherein one set of pressure sensor, led out between a four-way valve and a gas side solenoid valve, is provided to detect a low pressure upon room cooling and a high pressure upon room heating. CONSTITUTION:One set of pressure sensor 50 is provided at the lead-out section 48 of a pipeline 47, connected between the four-way valve 26 in the refrigerant control circuit of a heat pump type room cooling and heating machine and gas side solenoid valves 43, 44, through a lead-out pipe 49 to detect the high pressure of the pipeline 47 upon room heating and detect the low pressure of the pipeline 47 upon room cooling. Respective indoor machines 36, 37, operating during room cooling, are used under the low pressure (evaporating operation), therefore, the control of low pressure is effected while the same indoor machines 36, 37 operating during room heating are used under the high pressure (condensing operation), therefore, the control of high pressure is effected. Accordingly, variable frequency type capacity control of a compressor 25 may be effected by providing the pipeline 47 with one set of pressure sensor 50 and, thus, the capacities of respective indoor machines may be secured in constant.
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