Carrier 69NT40-561-201, Operation & Service Manual, Page: 49 / 117

3 − 20 T-364
Table 3 − 5 Controller Function Codes (Sheet 2 of 6)
Cd21 Capacity Mode The mode of operation is displayed (Unloaded - Standard - Economized).
Cd22 Compressor State The status of the compressor is displayed (OFF, On).
Cd23 Evaporator Fan Displays the current evaporator fan state (OFF, LOW, HIGH).
Cd25
Compressor Run
Time Remaining
Until 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 − 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 or Automatic)
This is the desired period of time between defrost cycles. Factory default is 3 hours.
Refer to Section 3.3.20 for information on Defrost Interval.
CnF11 determines whether the operator will be allowed to chose “OFF” as a de-
frost interval option.
CnF64 determines whether the operator will be allowed to choose “PuLS” as a
defrost interval option. For units operating with “PuLS” selected, defrost interval
is determined by the unit temperature setpoint and the Evaporator Fan Pulsing
Temperature Setting (Cd60). When the unit temperature setpoint is equal to or
less than the Evaporator Fan Pulsing Temperature Setting, the defrost interval is
set to 6 hours. Otherwise, the defrost interval is determined using the Automatic
Defrost Interval Determination logic. In either case, “PuLS” remains displayed in
this function select code.
After a new Defrost Interval is selected, the previously selected Interval is used
until the next defrost termination, the next time the DTT contacts are OPEN, or
the next time power to the control is interrupted. If the previous value or the new
value is “OFF”, the newly selected value will be used immediately.
If any Auto Pretrip sequence is initiated, Cd27 will be set to ’AUTO’ unless CnF49
(OEM Reset) is set to “Custom” AND CnF64 (Evaporator Fan Pulsing Logic) con-
figuration variable is set to IN, in which case Cd27 will be set to “PuLS”.
Cd28
Temperature Units
(Degrees C or
Degrees F)
This code determines the temperature units (C or F) that 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. This
function code will display “ ‐‐‐‐‐“ if 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.)
b - Partial Cooling (Compressor is on, standard operation.)
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 temperature band around the set point
which will be designated as in-range.
For normal temperature control, control temperature is considered in range if it is
within setpoint in-range Tolerance. 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
If the control temperature is in-range, the green IN-RANGE light will be illumi-
nated.
In-range tolerance shall be set to +/- 2.0
C upon activation of dehumidification or
bulb mode (Cd33, Cd35, Cd48).
When CCPC is actively controlling, in-range tolerance is not considered.
“-----“ will be displayed whenever Dehumidification is enabled or when CCPC with
six hour re-activation is actively controlling.
“-----“ will be displayed whenever Frozen Economy Mode is operating.