Refrigerator Troubleshooting Diagram

Evaporative Cooling System

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In some locations, it is possible to use the cooling tower principles to condense the refrigerant. This method has the usual problems with water and tower fungi.

The condensing coil is cooled by air drawn in from outside the tower and forced upward over the coil. Water is pumped continuously to a distribution system and sprayed so that it drops in small droplets over the condensing coil. See Fig. 16-10. The water is reused since it cools as it drops through the moving air stream. In some systems the water is pumped up and into a trough. The water drips down over the condenser coils and cools them.

In some cases, the water moves through the tubes that surround the refrigerant-carrying tubes. The air stream then removes the heat and discharges it into the surrounding air. This means the cooling tower should be mounted outside a building. In some instances it is possible to mount the tower inside. However, a duct is then needed to carry the discharged air outside. As shown in Fig. 16-10B, the water is carried off and must be replaced as it, too, evaporates. The pan is filled to level when the float moves down and allows the water makeup valve to open. If the condenser temperature reaches or exceeds 100°F (37.8°C), the thermostat turns on the water and the fan.

Problems with this system center in the electrical control system and the water system. The controls, fan motor, and pump motor are electrically operated. Thus, troubleshooting involves the usual electrical-circuit checks.

Written by sam

February 7th, 2011 at 7:53 am

Posted in Air Conditioning

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