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1) Open GV02 (yellow hand valve on QT recovery manifold) a little bit
2) Open VPC and VJV(A/B: depending on which LQ)
3) Regulate GV02 to have no more than 160slm on the HMI-FMR
4) Wait until FMR goes down to lower values (~40-70slm) and check the Dewar pressure is very low (~1 psi).
5) Switch the Liquefier to "Run"+"Manual" mode to warm up
6) Wait for a few hours until the Dewar pressure gets more lower and stabilize. To avoid going the LQ to "Alarm" mode, change the Dewar alarm pressure to 0.5 psi (box on the top right corner of the following screen shot).
8) Close GV02, then close VPC and close VJV(A/B: relevant LQ).
9) Turn ON cold-head heaters manually to bring the cold-head temperatures to room temperature
9) Pressurize the Dewar A/B to 6 psi by openining SV501(A/B) and then setting the flow to 20 slm on FC501BQMC (tap this box and enter 20 on the panel poping up on the lower right and press enter).
10) Open VPC, Open VJV(A/B), Open GV02 to regulate the flow from the Dewar to the tank with ~30 slm.
11) Repeat the step (9) and (10) several times until the cold-head temperatures are at room temp. and also the Dewar pressure holding at 6 psi once pressurized.
7) LHe Dewar cleaning procedure
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