Thermo King CRR-20, Руководство по обслуживанию

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Electrical, Refrigeration and
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P-D Menu Flow Diagrams Refrigeration Schematic: Dehumidification 9-40
CRR-20 & CRR-40, September 1999
Flow and Pressure Diagram
CRR-20 & CRR-40
Dehumidification
23. Electric Heaters
If the container humidity is 5% or more above the humidity setpoint, and the
temperature is in-range, the controller will pulse the electric heaters ON and
OFF in addition to energizing (closing) the dehumidify solenoid valve. This
increases the cooling load on the evaporator coil, thereby lowering the tem-
perature of the entire coil and condensing more moisture from the container
air.
34. Dehumidify Solenoid Valve (DSV) (Option)
Is a normally OPEN valve.
If the container humidity is between 1 and 5% above the humidity setpoint
and the temperature is in-range, the controller will energize (CLOSE) the
normally open solenoid. This closes refrigerant distribution to 50% of the
evaporator coil, thereby lowering the temperature of the active part of the
coil and condensing more moisture from the container air.
35. Humidity Sensor (rH) (Option)
The humidity sensor is located at the top right hand side of the evaporator
fan deck and measures the humidity of the return air from the cargo space.
High pressure gas
High pressure liquid
Low pressure gas
Low pressure liquid
Condensing high pressure gas
Low pressure vaporizing liquid
Liquid refrigerant injection
Modulated pressure