Refrigeration Maintenance
85
9. Observe the vacuum gauge.
The system pressure should remain below
2000 microns for 5 minutes.
If the pressure does not hold check for leaks
(if a leak is suspected) or continue evacuation
(if system is not dry).
10. Restart the pump, open the Evacuation Station
valve nearest the pump (V1) and repeat steps
6, 8, and 9 as required until system pressure
remains below 2000 microns for 5 minutes.
11. When system pressure remains below 2000
microns for 5 minutes, restart the pump, open
the Evacuation Station valve nearest the pump
and back seat the suction service valve while
the evacuation pump is still operating.
Replace the valve cap, re-close the Evacuation
Station valve nearest the pump (V1) and stop
the evacuation pump.
Do not exercise the service valves with the unit in
a deep vacuum unless the evacuation pump is
operating.
1
2
3
4
5
6
7
9
8
AGA171
1. V-4 6. To AC Power
2. V-3 7. Two Stage Pump
3. V-2 8. Calibration Standard
4. Thermistor 9. Vacuum or Micron Gauge
5. V-1
Figure 57: Multi-Temp Evacuation and Charging (Two Zone Unit Shown Other Units Similar)
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