Robinair 17801B Recovery, Recycling, Recharging Unit - Manual (Page 23)

Model 17800B/17801B Recovery/Recycling/Recharging Unit
21
ENGLISH
EVACUATION OVERVIEW
1. Verify the high- and low-side hoses are connected to the A/C-R
system, and that the high- and low-side valves are open.
2. Press SHIFT/RESET to toggle the display to show “PROGRAM VACUUM
MINUTES 15.00.” Fifteen minutes is the default time for evacuation. To
change the time, press the appropriate keys to display the desired time. Then
press ENTER.
Note: The longest time that can be programmed is 98.99 (98 minutes
and 99 seconds).
3. Press VACUUM to start evacuation. The display counts down the time
remaining. If the message “U-HI” appears, there is 25 psi or greater of
pressure at the inlet. You must recover that pressure to continue. If necessary,
press RECOVER.
4. When the programmed time has expired the vacuum pump automatically
shuts off and the display shows “CPL.”
To run the vacuum pump continuously, program the time to “99.00,” press
ENTER, then press VACUUM. The pump will start and the display will
show “CON AUTOMATIC VACUUM.” To turn the vacuum pump off, press
HOLD/CONT.
RECYCLING OVERVIEW
1. Verify both valves on the tank are open. Press and hold SHIFT/RESET and
then press “1” to start the recycling process.
2. When the tank temperature equalizes (after about five minutes of recycling
time), purge non-condensables from the tank. To purge, use the temperature
gauge to determine the temperature of the refrigerant. Then use the pressure/
temperature chart on the top of the unit to determine the correct pressure for
that refrigerant. If the gauge pressure exceeds the target pressure by more
than 10 psi, open the air purge valve for about 30 seconds and release non-
condensables from the tank.
3. Close the air purge valve and let the tank stabilize (about 30 seconds). Check
the air purge gauge again. Repeat Steps 2 and 3 as necessary during the
recycling process.
4. Close the tank's LIQUID valve to stop the recycling process. The unit will
pull into a vacuum and shut off automatically.
CAUTION:
You can stop
recycling
instantly by
pressing HOLD/
CONT, then
SHIFT/RESET,
but this can
leave liquid
refrigerant in
the low side
of the unit.
Closing the
tank’s LIQUID
valve is the
recommended
method.
Operating Overview
VACUUM PROGRAM
MINUTES
I5.00
VACUUM PROGRAM
MINUTES
CPL
AUTOMATIC
VACUUM Con