3-14
T-292
Table 3-5 Controller Function Codes (Sheet 2 of 3)
Cd22 Compressor State
The status of the compressor is displayed (Off, On).
Cd23 Evaporator Fan
Displays the current evaporator fan state (high, low or off).
Cd24 Controlled
Atmosphere State
Not used in this application
Cd25
Compressor Run
Time Remaining Un-
til Defrost
This code displays the time remaining until the unit goes into defrost (in tenths of
an hour). This value is based on the actual accumulated compressor running
time.
Cd26 Defrost Temperature
Sensor Reading
Defrost temperature sensor reading is displayed.
Configurable Functions
NOTE
Function codes Cd27 through Cd37 are user-selectable functions. The operator can change the value of
these functions to meet the operational needs of the container.
Cd27 Defrost Interval
(Hours)
The defrost interval is the time between defrost cycles. Five selectable values are
available: 3, 6, 9, 12 or 24 hours. The factory default value is 12 hours. Following
a start--up or after termination of a defrost, the time will not begin counting down
until the defrost temperature sensor (DTS) reading falls below set point. If the
reading of DTS rises above set point any time during the timer count down, the
interval is reset and the countdown begins over. If DTS fails, alarm code AL60 is
activated and control switches over to the the return temperature sensor. The
controller will act in the same manner as with the DTS except the return tempera-
ture sensor reading will be used.
Defrost Interval Timer Value (Configuration variable CnF23):
If the software is
configured to “SAv” (save) for this option, then the value of the defrost interval
timer will be saved at power down and restored at power up. This option prevents
short power interruptions from resetting an almost expired defrost interval, and
possibly delaying a needed defrost cycle.
NOTE
The defrost interval timer counts only during compressor run time.
Cd28 Temperature Units
(
_
C or
_
F)
This code determines the temperature units (
_
C or
_
F) which will be used for all
temperature displays. The user selects
_
C or
_
F by selecting function code Cd28
and pushing the ENTER key. The factory default value is Celsius units.
NOTE
This function code will display “
--- --- --- --- ---“ if
Configuration Variable CnF34 is
set to
_
F.
Cd29 Failure Action
(Mode)
If all of the control sensors are out of range (alarm code AL26) or there is a probe
circuit calibration failure (alarm code AL27), the unit will enter the shutdown state
defined by this setting. The user selects one of four possible actions as follows:
A -- Full Cooling (Compressor is on, economized operation. SMV subject to pressure
and current limit.)
B -- Partial Cooling (Compressor is on, standard operation. SMV subject to pressure
and current limit.)
C -- Evaporator Fan Only (Evaporator fans on high speed, not applicable with frozen
set points.
D -- Full System Shutdown -- Factory Default (Shut down every component in the
unit)
Cd30 In-Range Tolerance
The in-range tolerance will determine the band of temperatures around the set
point which will be designated as in-range. If the control temperature is in-range,
the in-range light will be illuminated. There are four possible values:
1 =
¦
0.5
_
C (
¦
0.9
_
F)
2 =
¦
1.0
_
C (
¦
1.8
_
F)
3 =
¦
1.5
_
C (
¦
2.7
_
F)
4 =
¦
2.0
_
C (
¦
3.6
_
F) -- Factory Default
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Summary of Contents for 69NT40-531 Series
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