MODULE III
Air-conditioning and Cooling technology Page 61

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a) = Control circuit
b) = Relative humidity of the heated outside air
1 = Air damper actuator with outside air/return air dampers
2 = Frost protection thermostat
3 = Supply air temperature low limiter
4 = Room temperature detector
5 = Temperature controller
5 = Hygrostat


Under normal conditions, the ventilating plant operates with return air. When the room humidity reaches a given value, the hygrostat 6 mounted in the swimming hall would respond. The cabinet will thereby be switched over from the return air to the outside air operation. The colder outside air warmed by the heater battery is now blown into the swimming hall relatively dry (see Fig. 49b), and is then capable of absorbing a great deal of moisture. The supply of 100% outside air is continued until the humidity in the room decreases to an extent which again causes the hygrostat to switch over to return air operation. This process is relatively economical, but has a number of disadvantages:


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