Robinair 34100 Automatic A-C Charging Station - Manual (Page 8)

6 © 1991 Robinair Division, SPX Corporation
TO RECOVER REFRIGERANT
IMPORTANT! Use a recovery unit. Do
not vent refrigerant to the atmosphere.
1. Be sure the A/C system is turned off,
then connect the yellow hose from
the manifold’s center port to your
recovery unit’s inlet port.
2. Open the manifold’s red high side
valve, blue low side valve, and center
valve, and start the recovery unit.
Follow the recovery unit’s instruc-
tions to recover refrigerant.
TO PROGRAM VACUUM/
CHARGING CYCLE
Vacuum is programmed in minutes and
refrigerant is programmed by weight. If
no quantity for any particular category is
required, enter zeros.
1. If the message “PROGRAM” is not
displayed, press RESET CYCLE.
2. The message “VACUUM” should
appear on the display. If it does not,
press the REVIEW PROGRAM key
repeatedly until it does.
Note: Follow the A/C system manufactur-
er’s recommendations for the proper
vacuum and refrigerant requirements.
3. Press the appropriate number keys
until the desired vacuum time
appears on the display. Enter
vacuum time in whole minutes.
For example, to program 20 minutes,
press two and zero — the display
shows “20.00.” Press ENTER and the
display flashes once indicating the
programmed data is accepted.
4. Press the REVIEW PROGRAM key.
The message “REFRIGERANT”
appears on the display. Enter the
amount of refrigerant to be recharged
to hundredths of a pound.
For example, to program 2 3 /
4
pounds,
press two, seven, five and ENTER.
The display shows “2.75” and flashes
once, indicating the programmed
data is accepted. To program 2
1 /
2
pounds, press two, five, zero and
ENTER — be sure to add the last
zero.
Note: Use the convenient conversion
chart on the back cover of this manual if
you need help converting ounces to
hundredths of a pound.
TO USE AUTOMATIC VACUUM/
CHARGING CYCLE
IMPORTANT! Before starting the
vacuum pump, be sure that all A/C
system pressure is discharged.
1. Close the SYSTEM DISCHARGE
valve, and open the appropriate high
side and/or low side valves on the
station.
2. Press the START key on the keypad.
The display shows the message
“AUTOMATIC” followed by the
message “VACUUM.”
3. After a slight delay the vacuum
pump starts. The display shows the
amount of time programmed and
begins a countdown to zero.
4. At the end of the automatic vacuum
cycle, the display shows the message
“HOLD.” Close the high and low side
valves and make sure the A/C system
holds a vacuum (if it doesn’t, perform
any necessary repairs). Then open
the high and low side valves, and
press CONT to continue charging.
Note: Consult your A/C system service
guide for the proper charging
procedure.
5. During the charging cycle, the
message “REFRIGERANT” appears
on the display. The display shows the
programmed amount of refrigerant,
counts down to zero as the charging
process proceeds, and indicates the
end of the charging process by
showing the message “CPL.”
6. If the refrigerant transfer is too slow,
the station emits an audible signal,
the display countdown stops, and the
message “CHECK REFRIGERANT”
appears on the display. Press the
HOLD key and close the high side
valve, but leave the low side valve
open. Start the A/C system, and press
the CONT key to pull the remainder
of the charge into the low side of the
A/C system.
Operating
Procedures