摘要:
A fault diagnostic apparatus for a device subject to a plurality of predetermined fault conditions. The apparatus includes a fault detector for automatically detecting the occurrence of any of the plurality of fault conditions and an indicating circuit for indicating the occurence of only specific one of the plurality of fault conditions manually designated by an operator.
摘要:
In an air conditioner separated into an indoor unit and an outdoor unit, a control circuit comprises a three-phase power source connected in common to the indoor and outdoor units, and a signal line led out from two phases of the power source. A contact of an electromagnetic relay energizing a compressor of the air conditioner is connected on the portion of the signal line in the indoor unit in series with a current sensor sensing the current flowing through the signal line, and a contact of a protective relay protecting the compressor is connected on the portion of the signal line in the outdoor unit in series with the electromagnetic relay. A first controller is disposed in the indoor unit for controlling on-off of the relay contact of the electromagnetic relay, and a second controller is disposed in the outdoor unit for energizing the protective relay contact thereby controlling on-off of the compressor.
摘要:
There are provided an electric energy meter with a transmission device that generates a pulse signal for measuring electric energy supplied to an outdoor unit, an input circuit for an external signal that receives the pulse signal, and a control unit that measures electric energy on the basis of the pulse signal, wherein the control unit includes a determination unit that determines, as an input port for the pulse signal, one of input ports that are not in use from among a plurality of input ports forming the input circuit for an external signal, and a calculation unit that calculates electric power, electric energy consumption, and energy consumption efficiency on the basis of the pulse signal.
摘要:
There is disclosed a current control apparatus comprising first controllers adapted for detecting an overall or total load current to calculate distribution values for distributing a current margin with respect to an overall or total current limit value to respective air-conditioners; and second controllers adapted for respectively controlling air-conditioners so as not to exceed individual current limit values, and for carrying out an incremental correction of individual current limit values in accordance with distribution values calculated by the first controllers.
摘要:
With an air conditioning system a plurality of building areas, for which individual energy accounts have to be rendered, are supplied by a common fresh air supply and cooling installation. The volume flow rates are controlled by one volume flow rate regulator each, the setpoint of which is adjustable through a servomotor. An output signal representing the setpoint of the volume flow rate regulator is generated and is applied to a meter. This provides with sufficient accuracy the distribution of the volume flow rates between the various building areas as a base for the accounting and billing of energy expenses.
摘要:
A ventilation system includes a connection determinator configured to determine that N-th, second, and sixth humidity controlling ventilation devices are connected to an identical second duct bank in a situation where when fans of the second and sixth humidity controlling ventilation devices are driven, and the rotational speed of a fan of the N-th humidity controlling ventilation device is changed, a power detector detects fluctuations in the power consumed by the fan of each of the second and sixth humidity controlling ventilation devices.
摘要:
A thermostat includes a controller configured to control the thermostat, a power supply sensor connected to the controller for sensing a thermostat power source, a wireless transceiver connected to the controller for receiving control information from a remote device and for transmitting information to the remote device, and a battery level indicator for determining a remaining power capacity of the battery. The controller sets a time schedule for enabling the wireless transceiver when the power supply sensor detects that the thermostat power source is a battery. The time schedule is changed to increase a time period between when the wireless transceiver is enabled as the remaining power capacity of the battery decreases.
摘要:
An air conditioning system processes sensible heat load and latent heat load of a target space, and adjusts temperature and humidity of the target space. The air conditioning system includes a cooling heat exchanger circulating a heating medium to cool and dehumidify air blown into the target space, a heater heating the air cooled and dehumidified by the heat exchanger, a stage speed variable blower fan creating a flow of the air blown into the target space through the heat exchanger and the heater, and control unit. The control unit has a quantity of cooling adjusting unit adjusting a quantity of cooling supplied from the heating medium to the air in the heat exchanger, a quantity of heating adjusting unit adjusting a quantity of heating supplied from the heater to the air, and a blown air flow volume adjusting unit adjusting an air flow volume supplied by the blower fan.
摘要:
A ventilation system includes first and second blowers connected to a plenum in parallel, with a first motor drive to control a speed of an electric motor of the first blower and a second motor drive to control a speed of an electric motor of the second blower. A controller associated with the first blower is programmed to receive a set point for a controlled variable that is controllable by operation of the first and second blowers, estimate a total air flow required from the first and second blowers to reach the controlled variable set point, calculate a blower speed ratio between a first blower speed and a second blower speed that provides the required total air flow at a minimum power consumption level, and generate commands to cause the first blower and the second blower to operate at speeds resulting in the calculated blower speed ratio.
摘要:
A heat pump or air conditioning system includes a process for calculating on a real time basis the capacity contribution of each of a number of heating or cooling stages. The calculated contribution is utilized to determine the number of stages that need to be activated at any point in time in the heat pump or air conditioning system.