GENERAL DESCRIPTION
36
Mode: Normal cooling/heating (6 HP system)
When there is a call for cooling, the R-410A maximum liquid line solenoid (101-SOL), minimum liquid line
solenoid (107-SOL), and the liquid injection solenoid (108-SOL) energize. The R-410A compressor turns
on. The high pressure switch (101-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, (101-SOL) and (107-SOL) is energized. Once the
chamber has reached a preset factory chamber temperature, the maximum liquid line solenoid (101-
SOL) will deenergize. When the chamber is near the set point, the controller begins to cycle (107-SOL)
on and off. At the same time, the R-410A hot gas bypass solenoid (109-SOL) cycles on and off opposite
of (101-SOL). If the chamber does not call for cooling for ninety seconds, the refrigeration system will
turn off.
When there is a call for heating, 101-SOL will de-energize and the heaters will energize.
Mode: Normal cooling/heating (10 HP - 15 HP systems)
When there is a call for cooling, the R-410A maximum liquid line solenoid (101-SOL), minimum liquid line
solenoid (107-SOL), and the liquid injection solenoid (108-SOL) energize. The R-410A compressor turns
on. The high pressure switch (101-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 has
to be manually reset. When there is call for cooling, (101-SOL) and (107-SOL) are energized. Once the
chamber has reached a preset factory chamber temperature, the maximum liquid line solenoid (101-
SOL) will deenergize. When the chamber is near the set point, the controller begins to cycle (107-SOL)
on and off. At the same time, the R-410A hot gas bypass solenoid (109-SOL) cycles on and off opposite
of (101-SOL). If the chamber does not call for cooling for ninety seconds, the refrigeration system will
turn off.
When there is a call for heating, 101-SOL will deenergize, and the heaters will energize.
Mode: Humidity (Optional Equipment)
In humidity mode, the system starts in the same manner as above with the following differences:
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 (101-SOL) is
energized. This allows refrigerant to flow through the R-410A dry bulb thermostatic expansion to
reduce the temperature of the chamber.
For Dry Bulb Temperature heating, the liquid line solenoid valve (101-SOL) is deenergized, and the
heaters are energized.
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