Polycold Cryochiller
Configuration
Installation and Operation Manual
Mode Selection
Brooks Automation
214072 Revision B
8-3
Mode Selection
All models have only one Standby mode.
Standby
Set the unit to standby using the operating mode command.
•
OPERATING_MODE,1,0P sets circuit 1 to Standby Mode.
Cool Mode Selection
Standard Cool Mode
Standard cool means that the cool valve is activated continuously. It is available on all units. Set the
unit to cool mode using the operating mode command.
•
OPERATING_MODE,1,1P sets the Cool mode to Standard.
Defrost Mode Selection
Standard Defrost Mode
In Standard Defrost mode, the unit defrosts the circuit until the return refrigerant reaches a speci-
fied set point. The default defrost termination set point is + 20 °C on all models. The defrost termi-
nation set point is configurable from -40 °C to + 20 °C.
•
OPERATING_MODE,1,9P
•
DEFR_SETPT,1,10P sets the Defrost complete temperature set point for circuit 1 to 10 C.
Alternate Thermocouple Control
Allows an alternate external or internal thermocouple to monitor and control the circuit performance.
Use this command to define which thermocouple to use for circuit control functions. By default, the con-
trol thermocouple for all circuit functions (i.e. defrost complete, temperature control, etc) is the Return
thermocouple for that circuit. This command allows you to select either the Coil Out, average of Coil In
and Coil Out, or customer process thermocouple.
•
EXT_TC_ENABLE,1,1P enables the External Thermocouple for circuit 1.
•
EXT_TC_ENABLE,1,0P enables the Internal Thermocouple for circuit 1
