Robinair 34134Z Refrigerant Recovery, Recycle, Recharge Unit - Manual (Page 20)

© 2003 SPX Corporation
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1. Verify the power cord is plugged into a correct voltage outlet, and the service
hoses are correctly connected to the A/C system. Important: Connect the red
service hose to the A/C system’s high side, and the blue service hose to
the low side.
2. On the control panel, open both panel valves.
3. Press the Mode key until the VACUUM screen displays. Press the Arrow
keys to set the amount of time desired for the vacuum. Fifteen minutes is
recommended, but the time may vary depending on environmental
conditions.
NOTE: The display screen shows the time as mm:ss; where “mm”
represents minutes and “ss” represents seconds. Setting vacuum time to 0
(zero) will result in continuous vacuum pump operation.
IMPORTANT: Check gauges to verify they are equal to or less than zero
to prevent damage to the vacuum pump.
4. Press the Start/Stop key to begin the vacuum operation. Watch the vacuum
time on the display. The display will count down the amount of time it will
take to evacuate the A/C system.
5. When the evacuation is complete, the unit will automatically shut off, and
INJECT OIL will display on the screen.
6. Close both panel valves on the control panel.
7. Note the pressure on the low-side gauge and then wait 5 minutes.
8. After waiting 5 minutes, check the low-side gauge for a rise in pressure. If
the pressure remains stable, the evacuation is complete. If there is a rise in
pressure, the A/C system may need further repairs or the evacuation may
need to be repeated. Repeat the evacuation if necessary.
Operation
After recovering all refrigerant from the A/C system, draining the oil from the
system, and making repairs to the A/C system, use the following steps to
evacuate (VACUUM) the A/C system.
WARNING
Evacuating the A/C System
Wear safety goggles when working with refrigerant. All hoses may contain liquid
refrigerant under pressure. Disconnect hoses using extreme caution. Read and
follow all warnings at the beginning of this manual before operating the unit.
VACUUM 15:00
VACUUM 00.00