Subzero CRC 1200 User Manual page 5

Description of parameters and functions.
Parameter
Sr.
(LCD Message)
No.
DIFFERENTIAL Function: To set the differential for
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compressor restart.
To change Use UP/DOWN keys to set desired value.
DIFFERENTIAL
parameter, press the set key.
Example : If setpoint is set at 10 C and
Range
differential is set at 2 C, then when the
Min Max Fact. Set
system reaches 10 C, the compressor
relay will cutout and since the differential is
1ºC 20ºC 2ºC
0
2 C, the relay will cutin (restart)
at 12 C (10 C + 2 C ).
QUICK FREEZE SP Function: To set Quick Freeze Set Point.
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To change Quick Freeze SP Use UP/DOWN keys to set desired value.
parameter, press the set key. This Parameter will set QUICK Freeze Set
Point during QUICK Freezing Defrost will
Range
not occur.
Min Max Fact. Set
Example : If this set to -20 C, and quick
- 0ºC 5 SP -20ºC
freeze frequency is set to 1 hr ,then when
it is set to quick freeze mode, then the
Comp. will take -20 C set point for 1 hr.
QUICK FREEZE DUR Function: To set Quick Freeze Duration.
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To change Quick Freeze Dur Use UP/DOWN keys to set desired value.
parameter, press the set key. This is the maximum amount of time
allowed for Quick Freeze. If set to "0",
Range
there will be no quick freeze.
Min Max Fact. Set
Example : see QUICK FREEZE SP
0Hrs 12 Hrs 0 Hrs
parameter.
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Parameter setting method
0
0
0
0 0 0
0
0
CRC1200
Description of parameters and functions.
Parameter
Sr.
(LCD Message)
No.
ROOM PROBE CAL Function: To set room probe 1
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calibration.
To change the Room Probe Cal Use UP/DOWN keys to set desired value.
parameter, press the set key.
In time it may be possible that the display
may be offset by a degree or so. To
Range
compensate for this error, you may need
to add or minus the degrees required to
Min Max Fact. Set
achieve the correct temperature. Setting
-10ºC 10ºC 0ºC
value is from -10 C to + 10 C.
Example : The temperature on the
display is 28 C, whereas the actual
temperature is 30 C. You will need to set
the Calib. Val to 2, which means that
once out of the programming mode, the
temperature will show 30 C
o
(28 C + 2 C).
COMP TIME DELAY Function: To set time delay between
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compressors relay restart time.
To change the Comp Time Use UP/DOWN keys to set desired value.
Delay parameter, press the set This parameter is used to protect the
key. compressor from restarting in a short
period of time and can be set between 0 to
20 minutes.
Range
Min Max Fact. Set
Example : If this parameter is set at 3
minutes, the relay will cut off at the set
0 Min 20 Min 3 Min
temperature, but will not restart for a
minimum of 3 minutes, even if the
differential is achieved earlier. This
parameter is good to protect the life of the
compressor or even in applications where
the probe is placed at places where there
are sudden & short changes in
temperature .
CRC1200
Parameter setting method
o o
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