Procedure for Filling the Fridge with LHe when the fridge is in the Hold Mode

1. Change the separator flow to 20 SLM (from 7 SLM usually). See this page for instructions → How to control the Separator Return flow
2. Wait for ~30 mins.
3. Fully open the gate-valve bypass  (See → How to control the Fridge Return flow (GV and GV Bypass)):
4. Open Run-valve to 3 turns
5. Wait until the Ann-Plate Top resistor goes up to 1400 Ohm, which indicates that the liquid started accumulating.
6. Wait until the nose LHe level reaches 100%.  It usually takes 15 minutes from the previous step.
7. Wait until the Heat-Ex Bottom resistor goes down from 1400 Ohm and then up
8. Fully, close the run-valve.
9. Change the setting of the gate-valve bypass as follows (See → How to control the Fridge Return flow (GV and GV Bypass)):
   1. The set point for the auto control is 600 Torr.
   2. The auto control is enabled.

Procedure for Filling the Fridge with LHe

The fridge is supposed to have no LHe at the beginning.  You can/should use this preset page to monitor the key parameters.

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