12
Purging Non-Condensable Gases
The 37880 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.
contact Ritchie Engineering Customer Service at (800)
769-8370.
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 FIL-
TER DRIER
The 37880 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 refrig-
erant 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 remain-
ing filter life.
Filter Change Procedure before Scheduled Filter
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 WARN-
ING! CHANGE FILTER DRIER”
Press Enter key to enter filter change mode.
Enter serial number using the keypad
