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1. Make sure both Liquefiers are on "Idle" mode.
   See the QT HMI main screen (see Fig 1a). If QLHe100A and QLHe100B says "Idle" then both liquefiers are on idle mode. If any of those statuses are different from "Idle". Then navigate to the Liquefier's screen (Fig 1c).
   By touching the "Quantum technology" box (top-left of Fig 1a), and then touching the Liquefier name box (see Fig 1b).
   
   
                                                                         Fig (1a) 
   
   
                                                      Fig (1b)
   
   Then, Click on the "Idle" button on the top-left corner of Fig 1c.
   
                                                Fig (1c)
   
   
2.  Turn ON purifier LN2 heater by clicking/touching the "Heater MC Cycle" button (see Fig 2a). Check whether "VNVA" is open (it is normally kept open), if not open "VNVA".
   You will see that the bottom part of the purifier (in Fig 2a) becomes "orange" and "Heater MC Cycle" becomes "green".
   Wait until the level drops down to <2% and also TA_Top and TA_Bottom reads > 273 K.
   
                                                            Fig 2a  
3. Close v30 and v35 hand valves on HR3 (as shown in Fig 3b) to isolate the helium space inside the purifier.
4. The pressure inside the purifier gHe space maybe at very high pressure (~50 psi or higher: Check the reading on p10 on HR3 manifold).
    Therefore, before opening the v10a to start the first cycle of pumping, we want to make sure that we isolate the purifier and relief the pressure down to ~1 psi (or slightly above the atmosphere).
5. Install pumping and purging setup (see Fig 3a and 3b below). A gHe bottle, the pump (green), and a pressure gauge need to be connected with two separate hand valves to open/close pump and gHe-supply (to purge) independently. In this step, do not open any solenoid valves on the QT-HMI, just only install the setup and proceed to the next steps.
   Note: it would be better if you use an electronic pressure gauge (eg: MKS sensor with the readout) instead of the mechanical gauge because some mechanical gauges can measure max. pressure as 15 psi.
   Therefore, these lower/smaller ranged gauges can mislead us.
   
                                         Fig 3a                                                                                                                           Fig 3b                  
   The pressure inside the purifier gHe space maybe at very high pressure (~50 psi or higher: Check the reading on p10 on HR3 manifold).
    Therefore, before opening the v10a to start the first cycle of pumping, we want to make sure that we isolate the purifier and relief the pressure down to ~1 psi (or slightly above the atmosphere).
   
   
    
6.  Close V30 on the HR3 manifold (see Fig 4a).
   
                                                         Fig 4a
   
   
7. Slightly open the hand-valve called "Vvent" on the Helium supply manifold (see Fig 5a), and listen to the sound generated by relieving gHe from that vent when you open "Vvent".
   When the relief sounds gets low in volume, that indicates that the pressure inside the purifier gHe space is close to the atmosphere.
   (Note that, In the Fig 5a, Vvent is fully open, and you don't need to fully open)
   
                                           Fig 5a
8. While keeping the "Vvent" is partially opened, and with low gHe relief sound → Open v10a on QT HMI (see Fig 5a); and then close "Vvent" hand valve.
   Navigation steps:
   "Quantum technology" (See Fig 1a) > "Puirifier Overview" (see Fig 1b) > "QuantumPure He Overview" (see Fig 6a).
   
                                    Fig 6a
   
   
9.  Start (green) pump and open the hand valve connects to the pump to pump down while the heater on purifier LN2 is ON (see Figa 3a for the hand-valve (black) to the green pump).
10.  Wait until the pressure on the gauge (pump-purge manifold: see Fig 3a) goes down to the lowest (usually it takes about 15-20 mins).
11.  Close the black-hand-valve to the green pump (you don't have to turn off the power to the pump, just keep it running as you will pump again in this procedure).
12.  Regulate the pressure of the gHe bottle ~3 psi and then open the blue-hand-valve (see Fig 3a) to purge the purifier gHe space.
13.  Close the blue-hand-valve when the pressure gauge reads ~3 psi.
14.  Open the black-hand-valve to start pumping down.
15.  Repeat Steps 9 → 12 as many times as you wanted.
16.  After done with the last cycle of pumping,  Close the black-hand-valve to the green pump.
17.  Regulate the pressure of the gHe bottle ~3 psi and then open the blue-hand-valve (see Fig 3a) to purge the purifier gHe space.
18.  Close v10a on QT-HMI screen (see Fig 6a).
19.  Open v30 hand-valve slowly until it is fully opened (see Fig 4a), and watch the pressure on p10. It will go up to the outside tank pressure.
20.  Check the pressures on p41 and p40 on the HR3 front. Both should read the same value.

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