Electrical, Refrigeration and
µ
P-D Menu Flow Diagrams
Refrigeration Schematic: Dehumidification
9-40
CSR-20 & CSR-40, September 1999
Flow and Pressure Diagram
CSR-20 & CSR-40
Dehumidification
19. 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 temperature of the entire coil and condensing
more moisture from the container air.
26. Dehumidify Solenoid Valve (DSV) (Option)
Is a normally OPEN valve.
If the container humidity is between 1 and 5% above the humidity set-
point and the temperature is in-range, the controller will energize
(CLOSE) the normally open solenoid. This closes refrigerant distribu-
tion to 50% of the evaporator coil, thereby lowering the temperature of
the active part of the coil and condensing more moisture from the con-
tainer air.
27. Humidity Sensor (rH) (Option)
The humidity sensor is located at the top right hand side of the evapo-
rator 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
