Robinair AC375C Refrigerant Recovery, Recycle, Recharge Unit - Manual (Page 21)

Recover/Recycle/Recharge Unit
19
Wear safety goggles when working with refrigerant. All hoses may contain liquid
refrigerant under pressure. Disconnect hoses using extreme caution. Read and fol-
low all warnings at the beginning of this manual before operating the unit.
1. Verify the power cord is plugged into a correct voltage outlet, and the
service hoses are connected to the A/C system. IMPORTANT: Connect
the red service hose to the A/C system’s high side; connect the blue
service hose to the low side.
2. On the control panel, turn the unit On, and open both panel valves.
3. Press the
Menu 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 environ­
mental conditions.
NOTE: The display screen shows the time as mm:ss; where mm rep-
resents minutes and ss represents seconds. Setting vacuum time to 0
(zero) will result in continuous vacuum pump operation. To exit the vacu-
um function, press the Start/Stop key ( ).
4. Press the Start/Stop key ( ) to begin the vacuum operation. Watch the
vacuum time on the display — the display counts down the amount of
time it will take to evacuate the A/C system.
5. When the evacuation is complete, the unit automatically shuts off, and In­
JECT OIL displays on the screen.
6. Close both panel valves on the control panel.
7. Note the pressure on the low-side gauge, and then wait five minutes.
8. Check the low­side gauge for a rise in pressure. If pressure remains sta­
ble, 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.
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 evac­
uate (VACUUM) the A/C system.
WARNING
Evacuating the A/C System
VACUUM 15:00
VACUUM 00.00
Caution: If the
display shows
PRESSURE EX-
ISTS, there is
pressure in the
hoses which
may damage the
vacuum pump.
You must per-
form a recovery
operation before
starting the vac-
uum operation.