MAHLE RTI TC670V - Manual (Page 14)

RTI Technologies, Inc.
February 5, 1996 Page 11
Figure 3 Deep Vacuum
DEEP VACUUM
If the A/C System is "opened" for replacing components, it is important to draw a deep vacuum on
the system before recharging with refrigerant. This vacuuming process not only removes air from
the system, but just as importantly, will remove any moisture in the system.
A Vacuum Pump in the TC670 provides the capability of performing this "Deep Vacuum and
Dehydration". The following steps should be followed:
To Deep Vacuum the A/C System, refer to Figure 3 and follow these steps:
1. Connect Red and Blue Hoses to the high and low sides of the A/C System.
2. Open Low and High Gauge Valves.
3. Open Red and Blue Hose Valves.
4. Press top (ON) of rocker switch marked DEEP VACUUM.
5. The Vacuum Pump will start and the TC670 will start drawing a vacuum which will be
indicated by a dropping pressure on the Low Gauge.
NOTE... If pressure is sensed at the Red and Blue Hoses on the TC670, the Vacuum Pump will
not start, as this would result in venting of refrigerant.
If this occurs, perform the recover/recycle operation described earlier.
ALSO... It may be necessary to momentarily loosen the Blue Hose to break the vacuum and allow
the pump to start if its operation has been interrupted.