Robinair AC375C Refrigerant Recovery, Recycle, Recharge Unit - Manual (Page 24)

© 2006 SPX Corporation
22
Operation
Recharging the A/C System Refrigerant contd.
CAUTION:
Before starting
the vehicle’s
engine, verify
the vehicle is in
PARK, or
NEUTRAL, with
the emergency
brake ON. Never
run a vehicle
without
adequate
ventilation in the
work area.
Clear Hoses
After the charge is complete, or after using the unit to diagnose an A/C
system, clear remaining refrigerant from the hoses to ensure a more accurate
charge. Follow this procedure to ensure all the liquid refrigerant trapped in the
service hoses is transferred to the vehicle A/C system.
1. Disconnect the high-side service coupler from the vehicle.
2. Open both panel valves
3. Place the vehicle gear selector in park or neutral with the emergency
brake ON.
4. Start the vehicle. Set the A/C system to its maximum setting.
5. The unit will charge out of the low-side inlet only, allowing the vehicle’s
compressor to pull the refrigerant into the A/C system.
6. Open and disconnect the low-side coupler from the vehicle after the high-
and low-side pressure gauges are at their lowest pressure reading.
7. Turn off the vehicle engine.
8. Close the panel valves.
9. Press the Start/Stop key ( ) to exit the charge function.
SLOW CHARGE Slow Charge Procedure
In some cases, the unit may not be able to charge the full amount. If the unit
cannot charge .05 lbs. in 30 seconds, the display shows SLOW CHARGE. If
this occurs, follow this procedure to pull the refrigerant in using the vehicle.
1. Disconnect the high-side service coupler from the vehicle.
2. Open both panel valves.
3. Place the vehicle gear selector in park, or neutral, with the emergency
brake ON.
4. Start the vehicle. Set the A/C system to its maximum setting.
5. The unit will charge out of the low-side inlet only, allowing the vehicle’s
compressor to pull the refrigerant into the A/C system.
6. Open and disconnect the low-side coupler from the A/C system when the
high and low pressure gauges are at their lowest reading.
7. When the required amount has been charged, the display shows
CHARGE COMPLETE. Close both panel valves and disconnect the unit
from the vehicle.
8. Close the panel valves.
9. Press the Start/Stop key ( ) to exit the charge function.