Abstract: An automobile air conditioner has a refrigeration cycle composed of a compressor, condenser, liquid tank, orifice means and an evaporator, as well as mechanical parts such as a radiator and radiator fan associated with the condenser and a blower combined with the evaporator. The compressor is operatively connected to the automobile engine through a connecting means so as to be driven by the engine selectively in accordance with the temperature in the passenger's compartment. According to the invention, the compressor is driven when the automobile is being braked, even if the temperature in the compartment is lower than a set temperature, to make an efficient use of the kinetic energy possessed by the mass of the automobile. The cold energy generated during braking is suitably stored and is released into the passenger's compartment as desired.

Abstract: In a method for controlling an air conditioning system including a frequency-variable power source device for providing an AC electric power of a variable frequency, and a compressor driven by the AC electric power, the air conditioning power of the conditioning system being dependent on the frequency of the AC electric power, the temperature of the air to be conditioned is detected; and a frequency set value is determined in accordance with a deviation of the detected temperature with reference to a set temperature. For determining the frequency set value, a plurality of temperature deviation zones are defined; the frequency set value is changed when the deviation transits from one of the zones to another; and the frequency set value is also changed when the deviation continues to be within one of the zones of a relatively great deviation over a predetermined length of time.

Abstract: An air-conditioning system in which a static inverter is driven at a predetermined constant frequency during a normal service mode of vehicle operation to effect operation of the vehicle cooling and/or heating unit such as to maintain the interior temperature of the vehicle within a chosen comfort zone. During initial start-up, when the interior temperature reaches extreme proportions due to the vehicle sitting in the sun or cold, an abnormal service mode of operation is called for in which the static converter is driven at an increased frequency and voltage for a predetermined limited time to rapidly bring the interior temperature within the comfort zone. The so-called abnormal service mode of operation may be indicated manually by the train service personnel under extreme temperature conditions after the start-up period of abnormal service mode has expired. Also provided is a passenger load sensing arrangement to increase the ventilation capacity of the cooling unit fans when overcrowding exists.

Abstract: A load shedding control device, for reducing the electrical energy demand of an electrical load apparatus having a load dependent upon ambient temperature, having an ambient temperature responsive switch adapted to be connected in a control system of the electrical load apparatus for reducing the use of electrical energy by the electrical load apparatus as the ambient temperature increases. The ambient temperature responsive switch has its control temperature reset depending upon the percent of operating time of the electrical load apparatus whereby as the desired operating time of the load apparatus increases, the actual operating time is reduced to conserve electrical energy.

Abstract: A control system for a central air conditioner. The air conditioner includes an outdoor condensing unit including a refrigerant compressor, an indoor evaporator unit, an indoor thermostat responsive to the indoor temperature for controlling the air conditioner, and a control system for protecting the air conditioner and indicating to the user certain malfunctions in the air conditioner should they occur. The malfunction indication may be by means of signal lights and a manually operable reset control is provided permitting the user to reset the control system. The malfunction indicator and reset control are disposed adjacent the thermostat for facilitated determination of the system operating condition. The control system includes an improved control portion for starting of the compressor motor which is arranged to prevent operation of the system in the event of a low power supply voltage condition.