12
Purging Non-Condensable Gases
The 3788X is designed to automatically purge non-
condesable gases such as air present in the
storage tank. When the pressure in the tank
exceeds a treshold value, the unit will automatically
purge the excess pressure. The unit will only purge
when it is first turned on. The current purge status
is displayed in the bottom right corner of the LCD
when in Select Mode.
The purge status should be either
“Y”, “N”,
or
“E.”
A
“Y”
indicates air is present in the tank. The unit
will purge the next time it is turned off and on. An
“N”
in the window indicates a purge is not needed.
An
“E”
will display on the LCD if the previous purge
was insufficient to lower the non-condensable gas
value below the limit. The purge time is set to 15
seconds to minimize refrigerant loss. If the LCD
continues to display an
“E”
after several purge
cycles, there may be an error in the system. Check
the pressure in the tank to determine if the system
is purging unnecessarily.
The best time to check the purge function is after
the unit has sat overnight and the tank temperature
is stable.
Maintenance Reminders
FILTER - MAINTENACE WARNING!
CHANGE FILTER DRIER
The 3788X has a unique filter system which
ensures the refrigerant transferred to the storage
cylinder is clean and moisture-free. The filters must
be changed periodically to ensure the system is
working properly. A maintenance reminder prompts
you when to change your filters. All refrigerant
must be removed from the old filters before they
are removed. Follow the filter change procedures
carefully to minimize refrigerant loss and ensure
only clean, moisture-free refrigerant is transferred
into the storage cylinder.
The new J2788 standard requires that the unit lock
out if the filter drier is not replaced at the proper
interval. The unit will prompt you when it is near the
end of its life. When the filter drier reaches 100 lbs
of refrigerant processed it will warn the user that it
is nearing the end of its life. When the filter drier
reaches 150 lbs of refrigerant processed it will lock
the user out and require a filter change before the
unit can be used again. The filter driers are marked
with a unique code that will be required to unlock
the unit.
Check Filter Life
Select the REF MANAGEMENT option in the
main menu.
Press the RIGHT ARROW key to view the
remaining filter life.
Filter Change Procedure before Scheduled Fil-
ter Change.
Follow these steps to change the filter drier before
the scheduled filter change:
Hold down DOWN ARROW key and turn main
power switch on.
When display reads “INPUT SERIAL NUMBER”
enter serial number using the keypad.
Filter Change Procedure if Filter Lock Out is
Reached.
When the display reads “ MAINTENACE
WARNING! CHANGE FILTER DRIER”
Press Enter key to enter filter change mode.
Enter serial number using the keypad