Activate Or Deactivate Purge Mode - Carrier EverFRESH Operation, Service And Parts Manual

3.5.3

Activate or Deactivate Purge Mode

When Purge mode is active, it allows the user to suspend EverFRESH operations while pre-charging gas levels in
the container. All EverFRESH control actions and alarm 929 is suspended in order to purge the container to a
desired gas concentration. When activated, Purge mode stays active for a period of time selected from the Purge
mode sub menu.
The CO2 setpoint is the level of CO2 allowed for the cargo. The range is 1 to 19% with a default set-
ting of 5%.
The O2 setpoint is the minimum level of oxygen allowed for the cargo. The range is 1 to 17% with a
default setting of 10%.
1. Press the CODE SELECT key on the keypad.
2. Use the Arrow keys until "Cd 71" is displayed, then press the ENTER key. The selection in the right display
will blink.
3. Use the Arrow keys until "PUrgE" mode is displayed, then press the ENTER key.
4. "CO2SP" appears in the left display with the setpoint value flashing in the right display. Press ENTER to
keep the originally displayed value. Or, use the Arrow keys to change the CO2 setpoint and press ENTER to
confirm. Setpoint values in the 1.0 to 2.8 range are in 0.2 increments, while values in the 3.0 to 19.0 range
are in 0.5 increments.
5. "O2 SP" appears in the left display with the setpoint value flashing in the right display. Press ENTER to keep
the originally displayed value. Or, use the Arrow keys to change the O2 setpoint and press ENTER to con-
firm. Setpoint values in the 1.0 to 2.8 range are in 0.2 increments, while values in the 3.0 to 17.0 range are
in 0.5 increments.
6. "PUrgE" is now in the left display. Use the Arrow keys to toggle the right display to "On" or "OFF", then press
the ENTER key.
When "OFF" is selected, Purge mode is either not activated or terminated if it was previously activated.
When "On" is selected, "tim" is in the left display with the current purge time flashing in 1 to 10 hour
increments selectable in 1 hour intervals (default 5 hours) in the right display. The "tim" value is the
amount of time EverFRESH will be held off to allow charging and settling of gases.
7. Use the Arrow keys to change the time value and press the ENTER key to confirm and enter Purge mode.
8. Purge mode is now active. During Purge mode, while the timer is counting down the display toggles
between the following:
• left display shows "PUrgE" and right display shows how much time remaining.
• left display shows temperature setpoint and right display shows the supply air temperature.
If there is an alarm in the alarm list, the Purge mode countdown will not be displayed but Purge mode
is still enabled.
9. When the Purge mode timer expires, Fresh mode is enabled and the unit reverts to normal temperature
control display. Purge mode is terminated on power cycle, trip start, defrost or pre-trip.
10. To view CO2 and O2 values during Purge mode, exit Cd71 by pressing the CODE SELECT key until "Cd 71"
is in the left display. Then, use the Up Arrow key to bring up Cd44 and press the ENTER key.
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