Robinair 342000 Refrigerant Service Solution - Manual (Page 19)

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342000 Refrigerant Service Solution
Operating Instructions
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PULLING A VACUUM
Prior to recharging a vehicle, it is critical that you evacuate the system to
remove any air. Air can affect system operation, but evacuation ensures air
and other contaminants have been removed and that the system is ready for a
recharge.
1. If you have disconnected the 342000 to make repairs, reconnect the blue
low side and red high side service hoses and open the service connectors.
2. Press the VACUUM key (or press the SCROLL MENU key to find the
screen with the VACUUM function key, then press VACUUM) to begin
operation. OR, from the SNAPSHOT recovery mode, press the SNAP-
SHOT SUMMARY key, then press the MAIN MENU key.
3. The default evacuation time of 15.00 minutes appears on the screen. This
function provides a minimum of three minutes of evacuation, and will
then shut off if a vacuum of 28" Hg is achieved.
4. If you desire to evacuate for more than fifteen minutes, change the time
using the numeric keypad or use the UP arrow to increase the time
(see page 9).
5. Press the START key to accept the evacuation time and begin the pro-
cess.
6. When the unit reaches a vacuum of 28" Hg., the red indicator light
flashes and the beeper sounds to indicate the process is complete. If
28" Hg is not achieved after 15 minutes of evacuation, the process stops,
the light and beeper signal that attention is needed, and you are prompted
to check for a leak.
MAKING REPAIRS
When all refrigerant has been removed from the vehicle, make any repairs or
component replacements. Take the following steps before making repairs:
1. Disconnect the unit from the vehicle.
2. Close the high and low side service coupler valves.
3. Disconnect the hoses from the vehicle access ports.
• Wait for the 342000 to automatically restart and pull any additional
refrigerant which has vaporized in the system (this occurs after five
minutes if a positive pressure is detected).
Additional recovered refrigerant is added to the amount shown on the screen.
NOTE: If you have entered the RECOVERY mode through the SNAPSHOT
mode, the unit will automatically return to SNAPSHOT when you exit RECOV-
ERY and will give you an updated printout.