Robinair 34988 Recovery, Recycling, Recharging Unit - Manual (Page 18)

16
Operating Instructions – Automatic
The automatic function allows a user to program an automatic recovery, vacuum, leak test, and /
or charge sequence. The user may choose to skip any step in the automatic operation during the
programming. A total automatic sequence may take an hour to complete.
Note: When a charge cycle in automatic mode is complete, the machine will not prompt to equalize
hoses; it will automatically compensate this amount of refrigerant.
1. Connect the high- and low-side service hoses to the A/C system; open the coupler valves on the hoses.
2. Select AUTOMATIC.
3. Decide if the unit should collect pre-recovery diagnostics by selecting YES or NO. Note: Data
may be printed from the Recover Diagnostics screen.
4. Decide if the unit should perform a recovery by selecting YES or NO. Note: Selecting YES
automatically programs the vacuum step of the recovery process. Selecting NO disables recovery,
but vacuum remains a choice for the operator. The next step would be to set vacuum time.
Operating Tips
• If the weight entered is more than the refrigerant
available in the internal tank, the charge
function will not start. The display reads
INSUFFICIENT REFRIGERANT
THERE IS NOT ENOUGH REFRIGERANT IN
THE ISV TO COMPLETE CHARGE. PRESS
TANK FILL TO ADD MORE OR EXIT TO ABORT.
Refer to the Maintenance section of this manual
for instructions to Manually Fill the ISV.
• If problems are encountered during the
automatic sequence, the unit will “beep” three
times and the control panel readout will pinpoint
the problem encountered. The sequence
remains paused until the user enters a decision
regarding how to proceed.
• Before the unit begins evacuating the A/C
system during the automatic sequence, it
checks for any pressure in the system that
may damage the vacuum pump. If pressure is
detected, the unit displays
PRESSURE TOO HIGH FOR VACUUM!
PRESS EXIT
Select EXIT. Recover refrigerant before
proceeding.
• If a leak test was programmed, and a leak is
detected, the unit displays
LEAK TEST FAILED
CONTINUE WITH AUTOMATIC MODE?
PRESS YES TO CONTINUE NO TO ABORT.
Select NO to exit automatic sequence and
perform needed repairs. Press YES to continue
automatic sequence despite the failed leak test.
• To ensure an accurate leak test, it is imperative
that a thorough recovery and evacuation of
the system is performed. During the recovery
process, cold spots can develop in the A/C
system. Pockets of refrigerant in desiccant and
in system oil will continue to vaporize as the A/C
system temperature equalizes toward ambient.
As this occurs, A/C system pressure increases,
which may be interpreted by the unit as a leak.
This varies somewhat with ambient temperature
conditions.
5. Decide if the unit should perform a leak test by
selecting YES or NO.
6. Decide if the unit should perform a charge by
selecting YES or NO. If yes, enter amount of oil to
be injected.
Note: The amount of oil recovered during the
recovery cycle is automatically injected before
the charge cycle, and no entry will be necessary.
If recovery was not selected, the amount of oil to
be injected may be entered while programming
the charge information.
7. Toggle DYE INJECT on or off. Select SAVE to
return to the charge screen.
8. Select MODE to toggle between high- or low-side
charge, or both. Note: Charge mode after injecting
oil allows only a high-side charge. Enter a charge
weight using the keypad, and select SAVE.
9. The display shows an overview of all tests
selected. Select START to begin the automatic
sequence.
10.When the sequence is complete, the display shows
CHARGE DIAGNOSTICS (if applicable)
START A/C TO PERFORM DIAGNOSTICS OR
WITH A/C OFF PRESS NEXT TO CLEAR
HOSES.
To obtain current pressure readings and
diagnostics from the vehicle, start the vehicle's air
conditioning system, or select NEXT to continue.
11. Close the high- and low-side coupler valves, and
remove the service hoses from the A/C system.
12. Select NEXT to begin clearing hoses. This
prepares the machine for the next service.
13. The machine displays a summary of actions
performed during the automatic sequence.