Robinair 34100 Automatic A-C Charging Station - Manual (Page 10)

8 © 1991 Robinair Division, SPX Corporation
USING MANUAL DIAGNOSTICS
The station has internal and manual
diagnostic modes. The internal or self-
diagnostic mode checks for entries or
pressures outside of normal limits and
for certain electrical conditions. The
manual diagnostic mode allows you to
check major components for proper
operation.
The station’s safety features include a
check valve which prevents high side
pressure from entering the refrigerant
tank. Also, any operating problems
resulting in an error message on the
display prevent operation until the
problem is corrected.
▲
WARNING
▲
Be sure to discharge any system pres-
sure before performing any manual
diagnostics.
1. If the message “PROGRAM” is not
displayed, press the RESET CYCLE
key.
2. Simultaneously press the ENTER
and zero keys. The display should be
blank except for the decimal point.
3. Press the following keys to perform
these functions:
Press “1” — The VACUUM display
segment comes on, the vacuum
solenoid opens, and the pump starts.
Press “1” again to turn off.
Press “3” — The REFRIGERANT
display segment comes on and the
solenoid opens. This is a momentary
contact switch which turns off when
released. Close the high and low side
valves to perform this test.
Press “5” — All display segments
light up. Press “5” again to turn off.
Press “6” — The display shows the
approximate weight on the scale. See
“Checking the Scale Accuracy” for
diagnostic procedures.
4. Press the RESET CYCLE key to
return to the program mode.
CALIBRATING THE SCALE
You should also routinely calibrate the
scale, if necessary, to assure that the
compressor shuts off when the tank is
full. You can automatically calibrate the
scale through the keypad.
▲
WARNING
▲
Proper operation of the scale is essen-
tial to safety features built into the
station. If you have any questions about
scale accuracy, call the factory.
1. Press ENTER and the zero key on
the keypad to access the diagnostic
mode, then press 8-7-8-7. The display
will show “A1.”
Note: If you press any other key before
the 8-7-8-7 sequence, you cannot enter
the automatic calibration routine.
2. Be sure the scale is empty of all
weight (e.g. tank). Press “0” and then
press ENTER on the keypad. The
display shows “0.00” and then
changes to the message “A2.”
3. Place a known weight (between 10
and 80 pounds) in the center of the
scale platform. Enter that weight on
the display using the keypad, then
press ENTER. The display returns to
the VACUUM mode.
4. To re-enter the diagnostics mode and
verify the calibration, simultaneously
press ENTER and the zero key on the
keypad. Then press “6.” The display
shows the known weight on the scale
platform.
5. Remove the known weight, and the
display returns to “0.00.”
Maintenance
Instructions
! !
! !