Central Air-Conditioning Control

The heating controls regulate the duration of the heating device. They usually operate from a room thermostat. Thermostat, then, must make suitable for electrical contacts. It will operate the heating mechanism to the desired room temperature is achieved. Then, the electrical circuit is opened, and is a heating device stopped. Details regarding the installation and operation are set out in Chapters 20, 21, 22 and 23.

Cooling is usually managed by a room thermostat. The thermostat can be a separate document, or may be built on heating with a thermostat. Refrigeration mechanism, as a rule, provides cooling. Room thermostat includes refrigerators, when the temperature rises above a certain temperature. It disables refrigerating machine when the temperature is lowered to the desired level.

Automatic humidifying of management, as a rule, regulate the flow of water or steam in the humidifier. If the air is too dry, additional moisture. In hnmidi-stat, as a rule, is in the same room as the temperature regulators.

In some Central air-conditioning systems Hu-midistat causes the refrigerating machines to work, if the EC air is too damp. The evaporator is located in the Plenum chamber, Central air conditioning system. Cold surface of the evaporator will condense moisture. Thus, the air is distributed dried.

Electrostatic air purifiers, as a rule, work at the same time, as no heating or cooling mechanisms. Air is drawn in through the air conditioner "laundered" when passing through electrostatic air purifier.

Requirements of the air conditioning system, the use of a heat pump is described as follows;

• Air conditioning system using a heat pump to provide the engine control to turn the motor-compressor on and off. As a rule, the same engine compressor is used for heating and cooling. Its work is controlled by a thermostat.
• Summer cooling, the system operates without additional control. During whiter, heating, however, more controls are required.
• Electrical resistance heater is also usually required in the evaporator. The device will work if the evaporator surface begins to ice over. (Ice will keep air from flowing through the heater.)
• When it is not possible to extract enough heat from the surrounding air, some systems use electric heating unit. Operation of the auxiliary electric heating block is automatically controlled by the condenser temperature.