Robinair Initial Operation

Robinair 95 302 Service Unit:

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 for a short period and close it again, in order to remove any excess pressure.
4. Open evacuating valve 13 and torrmeter cutoff valve 14. Switch on vacuum pump (switch 15). At an ambient temperature under 10°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.

Checking Service Unit For Leakage
1. Close evacuating valve 13. The pressure on the torrmeter must not rise; if it does, this indicates leakage in the unit or at the refrigerant-flask valve. If so, rectify.
2. Switch off pump, close valves 2, 9, and 14.