Automatic control anti-freezing system for air conditioning unit

• Main Author: GONG CAIJUAN
• Format: Patent
• Language: Chinese; English
• Published: 30.07.2014
• Subjects: AIR-CONDITIONING, AIR-HUMIDIFICATION, VENTILATION, USE OF AIRCURRENTS FOR SCREENING; BLASTING; HEATING; LIGHTING; MECHANICAL ENGINEERING; RANGES; VENTILATING; WEAPONS

The utility model discloses an automatic control anti-freezing system for an air conditioning unit. The automatic control anti-freezing system comprises an anti-freezing device arranged outside a tank, a temperature sensor, a relay, and a control box. A signal processing circuit is arranged within the control box and comprises a triode; a base of the triode is electrically connected with the temperature sensor through resistors R7 and R6 which are serially connected; a collector of the triode is grounded; an emitter of the triode is electrically connected with an anode of a diode D2 and a coil ground end of the relay; a cathode of the diode D2 and the coil power end of the relay are connected with 12V voltage; meanwhile, a normally on contact of the relay is electrically connected with a power source of the air conditioning unit. The automatic control anti-freezing system has the function of automatically controlling the anti-freezing device to operate or not, so that freeze-cracking of a heat exchange coil c