Initial Operation

INITIAL OPERATION

1. Plug in electric cable (220 V, 50 Hz). Switches 15 and 16 switched off, all valves closed.

2. Screw flask-connection piece onto refrigerant flask. Connect refrigerant flask and flask connection valve 1 with fill hose. Flask valve closed, flask connection valve 1 opened.

3. Open the cap on bleed nipple 3 for a short period and close it again, in order to remove any excess pressure.

4. Open evacuating valve 3 and torrmeter cutoff valve 14. Switch on vacuum pump(switch 15). At an ambient temperature under + 100 C, before switching on unscrew quick-release connection so that pump can warm up without drawing vacuum. After 1 or 2 minutes, re-close quick-release connection.

5. Evacuate until the maximum final vacuum is reached (depending on prevailing air pressure). Set torrmeter index indicator this reading.

6. Open valves 2 and 9, and evacuate further until the maximum vacuum is once again reached.