GENERAL DESCRIPTION
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Mode: Normal cooling (6 HP)
When there is a call for cooling, the R-508B/R-23 liquid line solenoid (202-SOL), and the R-404A
maximum liquid line solenoid (101-SOL) energize, and the R-404A minimum liquid line solenoid (107-
SOL) and the R-404A compressor turn on. Thirty seconds later, the R-508B/R-23 compressor turns on.
The high pressure switch (101-PS and 204-PS) will turn the compressor off if a high discharge pressure
event is reached. Contact Cincinnati Sub-Zero’s service department if this occurs. The high pressure
switch will automatically reset. When there is call for cooling, (202-SOL) is energized. When the
chamber is near the set point, the controller begins to cycle (202-SOL) on and off. If the chamber does
not call for cooling for ninety seconds, the refrigeration system will turn off.
When there is a call for heating, (202-SOL) will deenergize, and the heaters will energize.
Mode: Normal cooling (10 HP – 20 HP)
When there is a call for cooling, the R-508B/R-23 maximum liquid line solenoid (202-SOL), the R-508B/R-
23 minimum liquid line solenoid (203-SOL), and the R-404A maximum liquid line solenoid (101-SOL)
energize. The R-404A minimum liquid line solenoid (107-SOL) and the R-404A compressor turn on.
Thirty seconds later, the R-508B/R-23 compressor turns on. The high pressure switch (101-PS and 204-
PS) will turn the compressor off if a high discharge pressure event is reached. Contact Cincinnati Sub-
Zero’s service department if this occurs. The high pressure switch will automatically reset. When there
is call for cooling, (202-SOL & 203-SOL) is energized. When the chamber output drops below 90%
cooling, the controller will deenergize the maximum liquid line solenoid (202-SOL). When the chamber
is near the set point, the controller begins to cycle (203-SOL) on and off. If the chamber does not call for
cooling for ninety seconds, the refrigeration system will turn off.
When there is a call for heating, (202-SOL & 203-SOL) will deenergize, and the heaters will energize.
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 dehumidification is called for, the wet coil solenoid valve (H111-SOL) is energized. This allows
refrigerant to flow to the dehumidification evaporator (item H125).
When humidity is called for, the wet coil solenoid valve (H111-SOL) is deenergized.
For Dry Bulb Temperature cooling in humidity mode, the liquid line solenoid valve (H101-SOL) is
energized. This allows refrigerant to flow through the R-404A dry bulb thermostatic expansion valve
which enables the chamber to have tighter temperature control.
For Dry Bulb Temperature heating, the liquid line solenoid valve (H101-SOL) is deenergized, and the
heaters are energized.
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