| 摘要 |
<p>PURPOSE:To switch automatically air conditioning and heating in accordance with a room temperature, by combining comparators for inputting constant- voltage, and variable voltage by a variable resistance and a thermistor, to one and the other, respectively. CONSTITUTION:One input voltage of comparators 1a-1c for driving control relays 6a-6c through transistors(TRs) 5a-5c is fixed to constant-voltages V1- V3, and the other input voltage V0 is varied in accordance with a set temperature and a room temperature, by a variable resistance 3 for setting a room temperature and a thermistor 2 for detecting a room temperature. Also, the TR 5a is driven through a diode 7 by outputs of the comparators 1a, 1b. In this state, air conditioning and heating can be switched automatically in accordance with a room temperature, by controlling an operation of a compressor, an operation of a four-way valve for switching the air conditioning operation and the heating operation, and an operation of an electric heater by the relay 6a, the relay 6b and the relay 6c, respectively.</p> |
