Trane CAUC-C80 Installation Operation & Maintenance page 22

If a leak is encounter, repair the system and repeat the
evacuation process until the recommended vacuum is ob-
tained.
Once the system has been evacuated, break the vacuum
with refrigerant, and complete the remaining "Pre-Start Pro-
cedures" before starting the unit.
Figure 4-2
Evacuation Time-vs-Pressure Rise
1600
1400
1200
1000
800
600
400
200
-10 0
Initial evacuation pressure
10 20 30
TIME IN MINUTES
System Pre-Start Procedures (Continued)
Figure 4-1
Typical Vacuum Pump Hookup
Continuously increasing pressure
indicates the presence of leaks,
moisture or both.
State of equilibrium indicates the
true amount of moisture left in
the system. It indicates that no
leaks are present and the
system is properly evacuated.
40 50
22
State of equilibrium indicates the
true amount of moisture left in
the system. It indicates that no
leaks are present, but further
evacuation is required.
60 70 80 90