Robinair 17700Z Recovery, Recycling, Recharging Unit - Manual (Page 10)

8
© 2003 SPX Corporation
Evacuate the A/C System
1. Ensure service hoses are connected, and the coupler
valves are OPEN.
2. Press VACUUM .
3. Press START / YES to accept the default
evacuation time of 15 minutes, or enter the desired
vacuum time using the number keys, and press
START / YES .
The unit pulls a vacuum on the vehicle A/C system to
remove any air and boil off any moisture that may be
present in the system.
IMPORTANT : Evacuate the system for at least
15 minutes, or follow the A/C system
manufacturer’s specifications, to ensure
adequate moisture and contaminant removal.
4. The unit will give you the option of doing a leak
check after evacuation.
Press START / YES to perform the leak check.
Press STOP / NO to skip the leak check and begin
evacuation.
5. The unit evacuates the A/C system and stops when
the specified time has elapsed.
Press STOP / NO to pause the process. Press
START / YES to resume, or STOP / NO again
to exit.
You are now ready to replenish the A/C system oil, if
necessary, or to recharge the system with refrigerant.
Operating Instructions
Operating Tips
• If the vacuum pump has run for 10 or more
hours without an oil change, the unit displays
VACUUM OIL TIME XX:XX
CHANGE OIL NOW?
Refer to the Maintenance section of this
manual for instructions regarding Changing
Vacuum Pump Oil.
• Before the unit begins evacuating the A/C
system, it checks for any pressure in the
system that might damage the vacuum pump.
If pressure is detected, the unit displays
PRESSURE EXISTS
PRESS ANY KEY TO EXIT
Press any key to exit, and recover refrigerant
before proceeding.
• If a leak check was selected at the end of
vacuum, and a leak is detected, the unit
displays
LEAK CHECK FAILED
PRESS ANY KEY TO EXIT
Press any key to exit the evacuation, perform
needed repairs, and repeat evacuation.
• To ensure an accurate leak test, it is
imperative that a thorough recovery and
evacuation of the system has been performed.
During the recovery process, cold spots can
develop in the automotive system. Pockets of
refrigerant in desiccant and in system oil will
continue to vaporize as the A/C system
temperature equalizes toward ambient. As
this occurs, A/C system pressure will
increase, which may be interpreted by the
unit as a leak.
This will vary somewhat with ambient
temperature conditions.