GENERAL DESCRIPTION
Page 2-29
CASCADE CONTROL SYSTEM
Refer to Refrigeration Diagram in Drawing Section
Mode: Normal cooling/heating
When there is call for cooling the R-508B liquid line solenoid (2-SOL) energizes, and the R-404A compressor
turns on. Thirty seconds later the R-508B compressor turns on. High pressure switches (1 & 4 PS) will turn
off the compressors if a high discharge pressure is reached on either system. Contact Cincinnati Sub-Zero’s
service department if this occurs. The high pressure switches automatically reset.
When there is a call for cooling 2-SOL is energized. When the chamber is near the set point the controller
begins to cycle 2-SOL on and off. If the controller does not call for cooling for ninety seconds the refrigeration
system will turn off.
For heating, solenoid (2-SOL) is de-energized and the heaters are activated.
Mode: Humidity (Optional Equipment)
In humidity mode the unit runs as a single stage system. The R-404A compressor turns on. A high pressure
switch (1-PS) will turn the compressor off if a high discharge pressure is reached. Contact Cincinnati Sub-
Zero’s service department if this occurs.
When cooling is called for, solenoid H-1 SOL is energized allowing refrigerant to ! ow to the evaporator coil.
When the chamber is near the dry bulb temperature set point, the controller begins to cycle H-1 SOL on and
off. When Dehumidi" cation is called for, solenoid H-11 SOL is energized allowing refrigerant to ! ow to the wet
coil. When humidity is called for, solenoid H-11 SOL is de-energized.
To Next Page
Loading...