27
System Pre-Start Procedures (Continued)
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 4-1
Typical Vacuum Pump Hookup
Figure 4-2
Evacuation Time-vs-Pressure Rise
200
400
600
800
1000
1200
1400
1600
-10 0 10 20 30 40 50 60 70 80 90
TIME IN MINUTES
PRESSURE IN MICRON
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, but further
evacuation is required.
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.
Initial evacuation pressure
To Next Page
Loading...
Need help?
General