Electrical Projects A humidifier adds moisture to the air, but a dehumidifier, on the other hand, takes moisture out of the air and converts it to water. Refer to Fig. 5-11. A compressor, similar to, but smidler than, those used in refrigerators forces gas under pressure into the coils. The gas causes the coils to become cold. A fan draws humid air from the room into the unit from the front and passes it over the cold coils. Moisture from this air condenses on the coils, and drips into a receptor. The diy air, after passing over the condenser coils, is returned to the room.

The refrigeration unit is factory-sealed, and most manufacturers recommend that field servicing not be attempted. Instead, they suggest that it be returned to the factory for service. At certain temperature and humidity conditions frost may form on the cooling coil, but this will usually not harm the unit.

A humidistat maintains the humidity at the desired setting. The receptor has a knockout plug for connection to a drain or hose. If the knockout plug is not used, an adjustable o erf low switch will stop the unit and turn the signal light on.

The overflow switch is adjusted in this unit by the screw located under the receptor. Turning it clockwise will increase the water level in the receptor.




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August 20, 2008