Abstract: A method of operating a vehicle climate system when an ambient temperature is below a threshold temperature is provided. In response to an ambient temperature being less than a threshold temperature, a controller is adapted to operate a blower motor at a voltage that depends on whether the vehicle is in charge sustain mode or charge deplete mode. In response to an ambient temperature being greater than a threshold temperature, the controller is adapted to operate the blower motor at a voltage that does not depend on whether in the charge sustain or charge deplete modes.

Abstract: A scroll compressor with oil return unit, having a fixed spiral and an orbiting spiral, which compresses gas from a suction-pressure chamber into a high-pressure chamber. A counter-pressure chamber is connected to the orbiting spiral and the orbiting spiral presses onto the fixed spiral. The oil return unit has a counter-pressure spiral nozzle having a high-pressure channel connected to an end face for oil supply. A suction-pressure spiral nozzle with a suction-pressure channel connected to the end face discharges oil into the suction-pressure chamber. A counter-pressure channel is arranged between the counter-pressure spiral nozzle and the suction-pressure spiral nozzle for discharging oil into the counter-pressure chamber.

Abstract: In some examples, a system includes a communication interface, and at least one processor configured to cause sending, to a sensor device attached to a cargo transportation unit (CTU), parameter information through the communication interface, the parameter information controlling detection of a condition associated with the CTU by the sensor device.

Abstract: An apparatus includes an ejector, a first load, a second load, a third load, a first compressor, a second compressor, and an accumulator. The ejector directs a refrigerant to a flash tank that stores the refrigerant. The loads use the refrigerant from the flash tank to cool spaces. The first compressor compresses the refrigerant from the first load. During a defrost cycle, the first compressor directs the refrigerant to the third load to defrost the third load, the accumulator separates the refrigerant that defrosted the third load into a second liquid portion and a second vapor portion, the ejector directs the second liquid portion to the flash tank, and the second compressor compresses the second vapor portion.

Abstract: A blower assembly having a blower housing, an impeller fan within the blower housing, the impeller fan being adapted for rotation about an axis and having a plurality of impeller blades and having an axial length, a motor having a stator and a rotor, the motor having an axial length, the rotor being configured to rotate relative to the stator for rotation about the axis, the rotor and the impeller fan being coupled so that the impeller fan rotates with the rotor about the axis, wherein a ratio of the axial length of the motor to the axial length of the impeller fan is less than 0.3, and a motor support bracket operatively securing the stator to one of the first and second side walls of the blower housing.

Abstract: A system for making ice cream includes a pod, a whisking component, and a freezing component. The pod includes a mixture having a powder mixture, a flavoring liquid, and a stabilized fluid. The whisking component is attached to the pod. The whisking component whisks the mixture and produces a whisked, aerated mixture. The freezing component freezes the whisked mixture and produces ice cream.

Abstract: A system and method for controlling a sound level in a heating, ventilation, and air conditioning (HVAC) system are disclosed. The system includes a refrigeration unit including a compressor, a condenser fan, a controller, and a sound controller. The sound controller is configured to maintain a sound level of the refrigeration unit within a sound level operating range. A method of controlling a refrigeration unit for a heating, ventilation, and air conditioning (HVAC) system is described. The method includes determining, by a controller, a cooling requirement of a conditioned space. The controller also determines a sound level operating range for the refrigeration unit. The method further includes the controller applying a cooling setting based on the cooling requirement and the sound level operating range.

Abstract: A heavy duty truck includes an air conditioning loop having a compressor, a condenser mounted within an engine bay of the truck, an evaporator, and a cooling fan belt-driven by an engine of the truck mounted within the engine bay adjacent a radiator of the truck. A method of modifying the air conditioning loop includes removing the condenser from the engine bay, removing the belt-driven cooling fan from the engine bay, installing a remote condenser on the truck at a location that is external from the engine bay, the remote condenser in fluid communication with the primary air conditioning loop of the truck, installing an electric cooling assembly in the engine bay adjacent to the radiator of the truck, the electric cooling assembly comprising one or more electrically powered cooling fans and a surrounding shroud, and installing a control unit in electrical communication with the one or more cooling fans.

Abstract: A portable cooler includes an insulated body that defines a main interior storage space, and a lid structured to at least partially cover the main interior storage space. The lid includes an integrated blender or an integrated blender drive. Components of the blender may include a source of electrical power, an electric motor, and a blender spindle mounted through a surface of the lid and coupled to the electric motor. The integrated blender may also include a blender jar structured to hold food items for blending and one or more blending blades. The lid may further include a blender recess shaped in a negative mold of a collar of the blender jar to prevent the blender jar from rotating during operation.

Abstract: A vapor cycle refrigeration system includes a thermoelectric device (TED) as a sub-cooler to sub-cool liquid refrigerant exiting a condenser to increase cooling capacity of an evaporator and pull down temperature within a refrigerated compartment quickly. The TED sub-cooler is turned off after initial temperature pull down and is not operated during steady state operation for maintenance of the compartment temperature.

Abstract: An operation unit for a vehicle air conditioner includes a display device, a setting input portion of a control parameter of the air conditioner other than a set temperature, an obtaining portion configured to obtain a present set value of the control parameter, and an operating state identification portion configured to identify whether an air-conditioning operating state is in a plurality of predetermined operating states of the air conditioner. In the operation unit, a moving pattern of a pointer of the display device is changed according to the operating state of the air conditioner. For example, a pointer operation control portion can be configured to control an operation of a pointer driving motor such that the pointer moves on a dial of the display device at different moving speeds according to the air-conditioning operating state.

Abstract: A noise control method is provided for a cooling system having at least one refrigerant circuit. The refrigerant circuit includes a compressor, a condenser, at least one condenser fan, and an evaporator. Noise control is only performed periodically in response to requirements for reduced operation at predetermined times. The request for reduced noise triggers the commencement of the noise control method. The noise control method involves reducing the operating speed of the compressor, as well as reducing the operating speed of at least one condenser fan, to within a predetermined range of allowable reduced operating speeds. The noise control method temporarily overrides the ability of the cooling system to fully respond to increased cooling or heating demands.

Abstract: Disclosed is a gas safety device of a heating, ventilating, and air conditioning system for vehicles. The gas safety device includes a gas sensor installed at an air inlet connecting an engine room and the inside of a vehicle; and refrigerant cutoff valves installed at lines of an evaporator at the sides of refrigerant inlet or outlet for restricting the flow of a refrigerant by means of the operation of a control unit according to a sensing signal value of the gas sensor. In the gas safety device, when gas is leaked in the engine room after a starting switch of the vehicle is turned on, the gas sensor installed at the air inlet connecting the engine room and the inside of the vehicle senses the gas leakage, and outputs a corresponding signal value to the control unit.

Abstract: An operation unit for a vehicle air conditioner includes a display device, a setting input portion of a control parameter of the air conditioner other than a set temperature, an obtaining portion configured to obtain a present set value of the control parameter, and an operating state identification portion configured to identify whether an air-conditioning operating state is in a plurality of predetermined operating states of the air conditioner. In the operation unit, a moving pattern of a pointer of the display device is changed according to the operating state of the air conditioner. For example, a pointer operation control portion can be configured to control an operation of a pointer driving motor such that the pointer moves on a dial of the display device at different moving speeds according to the air-conditioning operating state.

Abstract: The present invention discloses an input device for a refrigerator through which the user can input a control command for controlling the operation of the refrigerator. The input device for the refrigerator can reduce an operation error and cut down a production cost by using optical signals. The input device for the refrigerator includes a display device having at least one button region, and an optical sensor unit mounted on the front or side surface of the display device, for advancing optical signals at the front portion of the button region.

Abstract: A switching device for an integrated product, such as a display, installed on a front surface of a door of a refrigerator is provided. The switching device includes a hinge assembly which rotatably couples the door to the refrigerator. The hinge assembly includes a power switch that applies power to the display, and a connector that connects the display to an external signaling/communication source. The switch may be provided on a lateral surface of a hinge plate portion of the assembly, and the connector may be provided on a rear surface of the hinge plate. The power switch and the connector may be connected to the display by lead wires.

Abstract: A vehicle air-conditioning apparatus includes a dehumidification means, which has a compressor and dehumidifies inside of the vehicle, a humidity calculation means, which calculates humidity in the vicinity of an inside surface of the windshield, and a determination means, which determines whether the windshield is fogged on the basis of comparison between the humidity and a predetermined value. A defogging operation for heightening dehumidifying performance of the dehumidification means is performed, when the determination means determines that the windshield is fogged in a state where the compressor is turned on. The dehumidifying performance of the dehumidification means is lowered or condition in which the defogging operation is started is made to be difficult in the next defogging operation, when the windshield is determined to be fogged and the defogging operation is not manually performed in a state where the compressor is turned off.

Abstract: The invention relates to an operating unit comprising at least one operating element, especially for adjusting the quantity of air, the temperature or the air distribution of an automatic air conditioning system, an automatic function and a manual adjustment function being provided. According to the invention, when changing from the automatic function to the manual adjustment function, the adjusted valued of the adjustment function is associated with the value of the automatic function which is selected during the changeover, or the next value in the direction of the new target value, or the closed value to the display value, or a value which can be pre-programmed in a fixed manner.

Abstract: In a vehicle air conditioner, a front air conditioning unit and a seat air conditioning unit are automatically controlled by an air conditioner ECU. If a seat air conditioner switch is operated by a user during an automatic control, the setting (e.g. air volume of a seat blower) of the seat air conditioning switch is learned. Based on the learning, a seat blower characteristic diagram, which is stored in a ROM, is changed. Therefore, from this time onward, under the same environmental condition, the seat blower air volume is determined based on the changed seat blower characteristic diagram. Accordingly, a seat air conditioning is provided as desired.

Abstract: The invention relates to an operator control unit having at least one operator control element, in particular for setting the air quantity or the temperature or the air distribution of an automatic air-conditioning system, an automatic function and a manual setting function being provided.

Abstract: In a vehicle air conditioner, a front air conditioning unit and a seat air conditioning unit are automatically controlled by an air conditioner ECU. If a seat air conditioner switch is operated by a user during an automatic control, the setting (e.g. air volume of a seat blower) of the seat air conditioning switch is learned. Based on the learning, a seat blower characteristic diagram, which is stored in a ROM, is changed. Therefore, from this time onward, under the same environmental condition, the seat blower air volume is determined based on the changed seat blower characteristic diagram. Accordingly, a seat air conditioning is provided as desired.

Abstract: A temperature controller is in a position at a height of 130 cm or more from a base surface settling, of which the refrigerator is settled, on a door of the refrigerator, which position is on an upper side of a handle for opening and closing the door. Further, a minute control depending on a preserving condition of foods, the seasons, a quantity of the foods, and so on is made possible.

Abstract: A control circuit for a refrigeration system disposed within an outer cabinet having a freezer compartment, a fresh food compartment, a compressor, a condenser fan, an evaporator fan, an evaporator and a freezer thermostat disposed within the freezer compartment to sense temperature therein. Additionally, a fresh food thermostat is disposed within the fresh food compartment to sense temperature therein. A freezer thermostat switch is switched between an open state and a closed state in response to temperature signals generated from the freezer thermostat. A fresh food thermostat switch is switched between an open state and a closed state in response to temperature signals generated from the fresh food thermostat. An energy saver switch is disposed between the fresh food thermostat switch and a power source, which energy saver switch is switched between an open state and a closed state.

Abstract: On an air-conditioning control panel equipped with an inside/outside air changeover switch which enables selection of an inside air recirculation mode, an outside air intake mode or an inside-outside two-air layer mode and comprises an inside air recirculation button and a light-emitting diode indicator, when the inside air recirculation button is turned on to light up the light-emitting diode indicator, the manual operation mode is selected for control of air-conditioning operation and the inside air recirculation mode is selected for air inlet operation. Further, when the inside air recirculation button is turned off to extinguish the light-emitting diode indicator, the automatic control mode is selected for control of air-conditioning operation and either the outside air intake mode or the inside-outside two-air-layer mode is selected for air inlet operation.

Abstract: A thermal storage monitoring and control system employed on a container refrigeration unit utilizes a "thermal flywheel" algorithm in combination with a data processor to control the temperature level within a cargo container to a maximum value. The thermal monitoring and control system operates the refrigeration system in a manner that causes the heat gain by the load during hot afternoons and evenings to be offset by the thermal storage built into the cargo. The monitoring and control system can be configured to operate automatically or manually.

Abstract: A method and an apparatus for controlling a temperature of a cooked food chilling chamber for quick refrigerating cooked food in a refrigerator, is disclosed. A system control section is provided with a load sensing signal of cook chill chamber from a cook chill chamber load sensing section in response to an operating of cook chill mode selecting key by a user. The system control section determines an operating time of a cook chill mode by controlling both a cool air supplying section and a cool air amount controlling section. The system control section stops the cook chill mode by controlling both the cool air supplying section and the cool air amount controlling section in accordance with a cook chill mode stopping key which is operated by the user. Accordingly, an inside temperature of the cook chill chamber is maintained within the range of the most appropriate temperature for keeping the cooked food fresh.

Abstract: An electronic climate control system for a car air conditioner comprises sensors for detecting an ambient temperature, an in-car temperature and a heat load, a climate control unit responsive to signals from the sensors for adjusting an interior environment within the vehicle passenger compartment towards desired in-car temperature and humidity conditions, a manual-input panel for manually setting a system's operating mode, and a communications line between the climate control unit and the manual-input panel. The climate control system has a fail-safe function for automatically selecting an automatic air-conditioning mode and/or a fresh-air mode as the system's operating mode necessary to prevent any moist air from fogging the windshield in the presence of a failure in communication between the control panel and the control unit.

Abstract: A vehicle air-conditioning system which operates in response to the manipulation of momentary switches is provided with discriminating means for discriminating whether any momentary switch is on at the time of system power-up. When the discriminating means finds that one or more momentary switches are on, the vehicle air-conditioning system is set to a predefined initial control state independent of contact information from such momentary switch or switches. As a result, at least the minimum temperature control required for occupant comfort can be secured when shorted contact sticking occurs in a momentary switch provided on an operation panel.

Abstract: An apparatus for controlling the operation of a refrigeration system having a compressor, a defrost timer that provides an operating power supply, a solenoid valve, and a thermostat includes a relay switch and a delay timer. The relay switch is coupled in series between the defrost timer and the thermostat, and it is configured to electrically disconnect an operating power supply from the thermostat for a predetermined time period regulated by the delay timer. The solenoid valve closes when the relay switch is in the opened state and the compressor remains functional during the predetermined time period.

Abstract: A method and apparatus for controlling an air conditioner having a variable speed compressor to circulate a refrigerant in a refrigerating circuit. The control apparatus and method generates a rotational speed pattern which can be directly changed by a predetermined value through a controller operable by the user. The compressor rotational speed is also based on the rotational speed used in a previous operation of the compressor to take into account the time lag occurring between the time the air conditioner is operated and the time the conditioned air is actually circulated in the room. Basing compressor speed on previous operations of the compressor minimizes large fluctuations in room temperature due to inaccuracies in temperature detection.

Abstract: A controlling apparatus for an air conditioner includes a relay serving to control the feeding of electricity to a compressor, a semiconductor element including a controlling terminal to control the feeding of electricity to a magnetizing coil of said relay, a temperature controlling mechanism for changing the connected state between contact points thereof to another one depending on a preset temperature value and a detected temperature value, a heating section adapted to generate heat by feeding a small quantity of electric current while performing temperature compensation in association with the changing operation with the contact points in the temperature controlling mechanism connected to each other, electricity transmitting paths each serving to feed the electricity fed from the contact points in the temperature controlling mechanism to the controlling terminal of each of the semiconductor elements therethrough, and a restricting circuit for allowing the semiconductor elements disposed in the electricity

Abstract: A refrigeration unit, and method of operating same, having a compressor driven by a prime mover. The prime mover is selectively operable in either a continuous mode which includes heating and cooling cycles, or in start-stop cycling mode which includes cooling and null cycles, to control the temperature of a conditioned space relative to a predetermined set point temperature. In one embodiment, the cycle mode is operable only when the set point temperature is in a predetermined temperature range, the limits of which are selectable. The prime mover is operated in the continuous mode, notwithstanding the selection of the cycle mode, when the set point temperature is not within the temperature range authorized for cycle operation.

Abstract: A control device of an air conditioner comprises a first controller which is installed in a room to be air-conditioned and which generates the signals for controlling an air conditioner. A second controller, which is installed in a different room from the room to be air-conditioned also generates signals for controlling the air conditioner. A main controller which receives the signals from the first controller via a first interface and receives the signals from the second controller via second interface, controls the air conditioner in accordance with the two types of signals. The first controller is designed such that once the signal for starting the air conditioning operation of the air conditioner has been sent to the first interface, the first controller sends the signal for running the air conditioner in a predetermined cycle to the first interface until the first controller transmits to the first interface the signal for stopping the operation of the air conditioner.

Abstract: A method for controlling the rotational speed of a motor-compressor used in an air conditioner for vehicle is disclosed. The rotational speed of the motor-compressor is controlled via an inverter circuit. The motor-compressor is driven at a predetermined constant rotational speed only when a constant rotational speed command signal for controlling the rotational speed of the motor-compressor to the predetermined constant rotational speed is sent to the inverter circuit. When refrigerant is charged to the refrigerant circuit of the air conditioner, the rotational speed of the motor-compressor can be controlled to an optimum speed without being influenced by other unnecessary conditions.

Abstract: An operating display device for an automotive air-conditioning system having an automatic operating mode which can be partially overridden by manual control of selected functions. A visual display provides a symbolic indication of the status of functions selected by said automatic operating mode as well as the status selected by manual control of such functions.

Abstract: An automatic operation control method automatically controls the temperature setting of a chamber, the defrost cycling and the operation of a compressor and a fan motor according to the door open/close frequency and open time. The defrost cycling is operated during a predetermined time period or an auxiliary time period according to the usage frequency of a refrigerator and the door open time before entering into the defrost cycle while being started after dropping the chamber temperature according to the current state of a temperature adjuster and the average value of the chamber temperature. The operation of a compressor and a fan motor is retarded to prevent the chamber temperature from increasing after the completion of the defrost cycling, thereby minimizing the temperature change of the chamber to protect the stored food.

Abstract: An air-conditioning system operates in an automatic control mode when an auto-switch is on. When a rotary member which is manually rotated to set one air-conditioning factor is rotated while the auto-switch is on, the air-conditioning system operates in a manual control mode as far as the one air-conditioning factor. The rotary member can be rotated endlessly. When the rotary member is rotated from one angular position to another when the air-conditioning system is operating in the automatic control mode, the one air-conditioning factor is set to a mode or a value which is determined on the basis of the amount of rotation and the mode or the value to which it had been set when the rotary member was in the one angular position.

Abstract: The position where an indoor unit is actually installed is manually instructed by an installation position confirmation element. A temperature correction value selector selects and outputs, from a Table prepared in advance, a temperature correction value (.DELTA.T.sub.s) in dependency upon the installation position confirmed by the installation position confirmation element in order to compensate a temperature difference which can exist between a temperature at a position to be mainly air-conditioned of a room and a temperature at the position where the indoor unit is installed, i.e., at the position where a room temperature is sensed. Thus, a set temperature (T.sub.s), a room temperature (T.sub.a), or a difference (T.sub.s -T.sub.a) therebetween is corrected by the temperature correction value (.DELTA.T.sub.s).

Abstract: An automatic air conditioner is arranged to be responsive to external air temperature in a manner wherein, if the atutomatic mode is interrupted and manual control instigated and the external temperature is low (viz., below a predetermined level), the mode to which the system defaults upon the automatic - manual change, is set to defrost, defrost/foot modes or the like. On the other hand, if the external temperature is high (viz., above the predetermined level) the system is conditioned to default to the vent mode.

Abstract: A demist controller for an automobile air-conditioner includes a demist judgement unit for judging the need for a demist operation based on the relative humidity in the vicinity of the inside surface of a window glass of the automobile, and a correction unit for automatically correcting criteria for a judgement by the judgement unit in accordance with starting and stopping instructions manually given by the driver as occasion arises.

Abstract: A transport refrigeration system is connected to a hydraulic system including a pump, control valves, a reservoir and a hydraulic device. When the refrigeration system is running, the hydraulic system is disabled and the diesel and compressor are run responsive to cargo refrigeration requirements. When the hydraulic system is activated, the diesel is caused to operate at a preselected speed for maximum hydraulic flow and the refrigeration electrical, if necessary, system unloads the compressor to divert more engine power to the hydraulic pump.

Abstract: A blower controlling device for an automobile air-conditioning system includes an automatic speed changing controller for controlling the speed of a blower motor during an automatic speed changing mode. The automatic speed changing controller includes a plurality of relays for changing speed of the blower motor, and automatically changes speed of the blower motor by driving the relays based on a thermal load signal from the air-conditioning system. The speed control of the blower motor can be switched from the automatic speed changing control to a manual speed changing controller by a changeover switch. The blower controlling device further include a control device which controls the automatic speed changing controller so that the relays do not operate when the blower motor is switched to the manual speed changing controller. Thereby, the relays are prevented from operating and generating their operating sounds when the air-conditioning system is not in the automatic speed changing mode.

Abstract: An electric refrigerator is disclosed which includes first and second coolers independently disposed in a freezer and a refrigeration chamber, respectively, a compressor for delivering a refrigerant therefrom, an electromagnetic valve for switching a refrigerant channel including the first and second coolers between a first referigerant flow path for supplying the refrigerant to only the first cooler and a second refrigerant flow path for supplying the refrigerant to both the first and second coolers, and a control circuit for causing the electromagnetic valve to form the first refrigerant flow path for a predetermined time interval and for causing the electromagnetic valve to form the second refrigerant flow path by preventing interruption of the compressor when the predetermined time interval has elapsed and an air temperature in the refrigeration chamber is higehr than a predetermined temperature.

Abstract: A refrigerator includes a mode-change chamber, having first and second dampers which may be selectively used as a freezer compartment, refrigeration compartment or chill compartment. When the freezer compartment mode is selected, the first damper permits the flow of cold air into the mode-change chamber to maintain the temperature in the mode-change chamber at a freezing temperature. When the refrigerating compartment mode is selected, the second damper permits the flow of cold air into the mode-change chamber to maintain the temperature in the mode-change chamber at the selected refrigeration temperature. When the chill compartment mode is selected, the control temperature of the second damper is forcibly expanded by a heater to maintain the temperature in the mode-change chamber at a chill temperature between the freezing and refrigeration temperatures.

Abstract: The present invention relates to an automotive air-conditioning system comprising an arithmetic means, control means, diagnostic control means and diagnostic setting means. The invention enables one to diagnose whether output devices such as an air mixing door, a compressor or the like are normally operable or not.

Abstract: A transport refrigeration system is connected to a hydraulic system including a pump, control valves, a reservoir and a hydraulic piston. When the refrigeration system is running, the hydraulic system is in a bypassing or idling mode and the diesel and compressor are run responsive to cargo refrigeration requirements. When the hydraulic system is activated, the diesel is caused to operate at a preselected speed for maximum hydraulic flow and the refrigeration electrical system unloads the compressor to divert more engine power to the hydraulic pump.

Abstract: A control method for an air conditioning system for a vehicle, which is driven by an engine installed on the vehicle. The control method comprises selecting either a first control manner of controlling the air conditioning system so as to preferentially ensure required driveability of the engine, or a second control manner of controlling the air conditioning system so as to preferentially ensure required cooling capacity of the system, and controlling the air conditioning system in accordance with the selected control manner.

Abstract: A refrigerating apparatus adapted for storage of cold storage goods as well as frozen goods and having both a heater and a cooler is controlled by an improved temperature control device, which includes a detector for detecting a temperature of return air from the interior of a storage area of the refrigerating apparatus and a detector for detecting a temperature of an air output which is blown into the interior of the storage area, and which controls either the higher one of the two detected temperatures or the lower one of the two detected temperatures depending upon a set temperature. In the case of storing cold storage goods, the lower one of the two detected temperatures is controlled so as to be maintained at the set temperature, whereas in the case of storing frozen goods, the higher one of the two detected temperatures is controlled so as to be maintained at the set temperature.

Abstract: A refrigerator having a control device is provided with a refrigerating cycle system constructed by connecting in series a compressor, a condensor, capillary tubes, a storage compartment evaporator and a freezing compartment evaporator. This control device comprises a first control circuit to forcefully cool the freezing compartment evaporator upon receipt of a first instruction signal, a second control circuit for removing the frost deposited on the freezing compartment evaporator upon receipt of a second instruction signal, and a preferential control circuit, which, in case an operation based on a preferentially issued instruction signal is taking place, and, during this interim, a delayed instruction is given, causes an operation based on the delayed instruction signal to be commenced only after the operation based on the preferential instruction signal is brought to an end.

Abstract: In a control system for an air conditioner of a motor vehicle, which includes an automatic control circuit arrangement for controlling the air conditioner to enable it to operate at a desired level of the heating or cooling performance thereof, there is provided an emergency circuit arrangement which is adapted, in case the automatic control circuit arrangement fails to work properly, for example, to cause it to be disconnected from the air conditioner and enable the latter to operate only at the maximum level of the heating or cooling performance thereof. There is also provided a switch device which is connected to selectively render operative a desired one of the above two circuit arrangements, and provided with means for preventing the emergency circuit from being unintentionally rendered operative.