Robinair 34788-I Recovery, Recycling, Recharging Unit - Manual (Page 16)

14
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:
• Oil recovered during the recovery cycle can be
injected by the user before the charge cycle, or can
be manually injected into the vehicle after charge
using a separate oil injection tool.
• 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, and open the coupler valves on the hoses.
2. Press the AUTOMATIC button. See Figure 9.
3. The unit asks if a recovery is needed. Press STOP
/ NO to skip the recovery cycle; press START / YES
to accept.
4. The unit asks if a leak test is needed. Press STOP /
NO to skip the leak test; press START / YES to accept.
5. The unit asks if a charge is needed. Press STOP /
NO to skip the charge cycle; press START / YES to
accept. Press CHARGE to toggle between high- or
low-side charge, or both.
Accept the default weight by pressing START / YES,
or type in a desired weight using the number keys
and press START / YES.
6. The display shows an overview of all the tests that
were selected. Press START / YES to begin the
automatic sequence.
Note: If a high-side charge has been selected, before
charging, the automatic sequence will pause and
“beep” for 30 seconds to allow the user to inject oil, if
desired. See Replenish the A/C System Oil instructions
in this manual.
7. When the sequence is complete, the display shows
the amount of refrigerant that was recovered and
charged.
8. Close the high- and low-side coupler valves, and
remove the service hoses from the A/C system.
9. Press START / YES to clear the hoses.
10. If any oil was recovered during the recovery cycle,
and oil was not injected before the change cycle,
use an oil injection tool at this time to manually inject
oil into the A/C system.
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 REFRIG.
PRESS ANY KEY TO EXIT
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 EXISTS
PRESS ANY KEY TO EXIT
Press any key to exit the automatic sequence.
• If a leak test was programmed, and a leak is
detected, the unit displays
LEAK TEST FAILED
PRESS STOP TO EXIT
PRESS START TO CONTINUE
Press STOP to exit the automatic sequence
and perform needed repairs. Press START to
continue the 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 automotive 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.
Automatic
Function
Figure 9