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CRR-20 & CRR-40, October 1999
Specifications
µµ
P-D Microprocessor
1-7
Thermoguard
®
µµ
P-D Microprocessor (Continued)
Defrost Termination:
Evaporator Coil Sensor*
Chill mode: Terminates defrost when coil sensor temperature rises
to 30 C (86.0 F)
Frozen mode: Terminates defrost when coil sensor temperature
rises to 18 C (64.4 F)
Interval Timer**
Terminates defrost 90 minutes after initiation if coil sensor has not
terminated defrost
Time/Temperature Function
If the evaporator coil sensor exceeds 8 C (46 F) for 10 minutes, the
controller terminates defrost (Frozen Mode Only)
Power Off
Turning unit On/Off switch OFF terminates defrost
Evaporator Over Temperature Protection
Operates only when unit is in Heat or Defrost modes: Opens heater
contactor at 38 C (100 F). Opens phase select contactor to shut
down all unit operation and initiate an alarm at 50 C (122 F)
Bulb Mode (Option)***:
Defrost Termination Temperature (BDFTT) Setting
4 to 30 C (40 to 86 F)
Evaporator Fan Speed Settings
High Speed only; Low Speed only; or Cycle (fans will cycle
between low and high speeds every 60 minutes)
Economy Mode (Standard Feature):
Description
Reduces power consumption by reducing evaporator fan operation
Set to ON for Fresh Loads
Evaporator fans operate on low speed whenever the container tem-
perature is In-range
Set to ON for Frozen Loads
Evaporator fans stop during Null mode. Controller operates fans
for 5 minutes every 45 minutes to circulate container air
Turn Mode ON and OFF
Set from ECON screen of the Program menu of the controller
ECMIN Temperature
2.0 C (3.6 F) default setting; Adjustable from 0 to 10 C (0 to 18 F)
in Menu Guard
ECMAX Temperature
1.0 C (1.8 F) default setting; Adjustable from 0 to 10 C (0 to 18 F)
in Menu Guard
Power Reduction Mode (Standard Feature):
Power Reduction (PWRED) Settings
0 = OFF; 1 = 10% Power Reduction; 2 = 20% Power Reduction;
3= 30% Power Reduction
Pulp Mode (Option)****:
Control Settings
OFF or ON (Controller records Pulp Sensor temperature)
USDA Mode (Standard Feature):
Turn Mode ON and OFF
Set from USDA screen of the Program menu of the controller
Operation
Controller automatically detects sensors to initiate data logging.
However, USDA sensors must be ice bath calibrated to accurately
record temperature
*If the evaporator coil sensor fails, the controller terminates defrost when the return air (top) sensor rises to 18 C (64.4 F).
**If both the evaporator coil and return air (top) sensors fail, the interval timer terminates defrost 60 minutes after initiation.
***Unit must be equipped with dehumidify system.
****Sensor must be installed and calibrated.
Содержание CRR-20
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