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CODE #
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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 or Au-
tomatic)
Cd28
Temperature Units (Degrees
C or Degrees F)
Cd29
Failure Action (Mode)
T-365
Table 4–3 Controller Function Codes (Continued)
DESCRIPTION
Configurable Functions
This is the desired period of time between defrost cycles. Factory de-
fault is 3 hours. Refer to
terval.
CnF11 determines whether the operator will be allowed to chose
"OFF" as a defrost interval option.
CnF64 determines whether the operator will be allowed to choose
"PuLS" as a defrost interval option. For units operating with "PuLS" se-
lected, 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 De-
frost Interval Determination logic. In either case, "PuLS" remains dis-
played in this function select code.
After a new Defrost Interval is selected, the previously selected Inter-
val 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 val-
ue will be used immediately.
If any Auto Pretrip sequence is initiated, Cd27 will be set to 'AUTO' un-
less CnF49 (OEM Reset) is set to "Custom" AND CnF64 (Evaporator
Fan Pulsing Logic) configuration variable is set to IN, in which case
Cd27 will be set to "PuLS".
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.
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 en-
ter 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 applica-
ble with frozen set points.)
d - Full System Shutdown - Factory Default (Shut down every compo-
nent in the unit.)
4–28
Section 4.3.20
for information on Defrost In-
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Troubleshooting
