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2. The right display window will display the current defrost interval - either 3, 6, 9, 12, or 24 hours.
3. To change defrost interval, use the arrow keys to toggle to the new interval and press the ENTER key. If the
ENTER key is not pressed, the interval will not be changed.
4. After a new defrost interval is selected, the newly selected value will be used immediately.
3.2.6
Remote Enable Temperature
Remote enable temperature is a user selectable parameter that sets the temperature the host unit needs to reach
prior to enabling full remote cooling capacity.
This function is only applicable with host frozen set point (below 14 degrees F). If attempt to access this function is
made in host perishable mode, the display will show ------. Remote enable must be set below the host's set point.
To set remote enable temperature, use the following steps:
1. From Cd52, press the ENTER key to scroll to the desired sensor.
2. The left display window displays "rEnbL".
3. The right display window displays the current remote enable temperature.
4. Remote enable is user selectable in 0.1 degree increments from -13.0 to 24.8 degrees F. The default value
is 14.0 degrees F.
3.2.7
Remote Minimum Temperature Delta
The remote minimum temperature delta is a user-selectable parameter and is only applicable in the host frozen
pull-down mode. This value reflects the difference between the remote evaporator return and supply air tempera-
tures. This parameter can only be set if the host has a frozen set point, and the host return temperature is above
the remote enable temperature.
The remote temperature delta temperature prioritizes capacity between the two compartments during frozen pull-
down. For example, a low remote temperature delta setting (i.e. 0.9 degrees F) will give the majority of cooling to
the host unit. A high remote temperature delta setting (i.e. 14.4 degrees F) will send the majority of the cooling to
the remote unit causing the host unit to take longer to read its remote enable temperature.
To set the remote minimum temperature delta, use the following steps:
1. From Cd52, press the ENTER key to scroll to the desired sensor.
2. The left display window displays "rt∆".
3. The right display window displays the current remote minimum temperature delta.
4. Remote minimum temperature delta ranges from -0.9 degrees F to 14.4 degrees F. The default value is 3.6
degrees F.
3.3
REMOTE COMPARTMENT ALARMS
Alarm display is an independent controller software function. If an operating parameter is outside of expected
range or a component does not return the correct signals back to the controller, an alarm is generated.
A fault in the remote compartment refrigeration system will trigger an AL 04 alarm. The display window will display
"AL 04", alternate with the set point. This is a general fault alarm.
The AL 04 will light the alarm light, which will stay lit until the fault is corrected. Specific fault alarms for the remote
evaporator are stored in the remote alarm list ("rAL") and are accessible through ALT MODE (see
The rAL alarm codes correspond to the host alarm numbers. For example, the rAL22 (remote evapo-
rator motor IP) corresponds to the AL22 (host evaporator motor IP).
The alarm philosophy balances the protection of the refrigeration unit and that of the refrigerated cargo. The action
taken when an error is detected always considers the survival of the cargo. Rechecks are made to confirm that an
error actually exists.
NOTE
3–5
Table
3–3).
T-319
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