A. Vaporizer Procedure
1. Test all Oxygen monitors.
            Lower Cell Entrance (near Diborane Cabinet)
            Lower North Wall (near C-Mod Cell Power Panel B)
            Lower Power Room (near Bus Tunnel Stairs)
            Igloo Bottom (Inner Southeast Igloo)
            Lower West Wall (horizontal center of wall)
            Diagnostic Lab
            Igloo Top (Inner Northeast Igloo)
2. Verify audio and visual alarms are working
            North wall setup lab
            West wall power room
            West wall, northwest corner of cell
            South wall, southeast corner of cell
3. Verify the Cryo System is fully assembled and sealed.
4. On Cryo #1 Console, login to the Cryo screen.
5. Toggle to Cryo Bypass Screen.
6. Set Cryo Pressure to 0.05 and record change in logbook.
--Note: Cryo System should be in sleep mode and all valves in auto mode.
WARNING: PLEASE READ ALL OF STEP 6 BEFORE PERFORMING.
    TWO OPERATORS REQUIRED TO COMPLETE STEP 7.
7.1) First operator should slowly open vaporizer's main valve, which is located at top of Bus tunnel,
        while second operator reads the LOW CRYOSTAT PRESSURE sensor (top left gauge).
        If at any time the pressure exceeds 0.15, the second operator should have the first operator close
        the valve.
7.2) First operator should verify the flow of nitrogen with the CFM gauge .
--Typical flow rate when first open is 220 CFM.
--A high LN2 gas flow rate may overwork vaporize and raw liquid could be drawn into vaporizer line. This should be prevented.
7.3) First operator should verify modulating valve responds to pressure increase.
--Valve should respond by closing from 100% open to some lower level.
--Valve feedback time response is long (slow to respond)
CAUTION: Flow should decrease as cryostat pressurizes. If flow does not decrease after several minutes, this might indicate a major leak in the cryostat or the modulating valve is not responding to the pressure increase. If flow does not decrease, the vaporizer's main valve should be closed until the problem is located and fixed.
8. On Cryo Temp screen of Cryo Console, verify all readings are responsive and pressure regulates at pressure set point.
9. Test lower and upper limits of LOW CRYOSTAT PRESSURE sensor are active.
10. Record necessary data in logbook and make any necessary repairs.
11. If all readings are acceptable, increase Cryo pressure limit to 0.15.
-- Tranducer reading to coils ~ 8 psi.
12. To detect leaks, complete nitrogen and ultrasonic tests around machine.
13. If necessary, notify AIRCO.
14. Set pressure on all experiment regulators to each required valves.
 

B. LN2 Sump Fill Procedure
CAUTION: FILLING OF THE SUMP SHOULD ONLY BE STARTED AFTER THE CRYO SYSTEM HAS BEEN PURGED OF MOISTURE BY FOLLOWING THE VAPORIZER PROCEDURE ABOVE.
---- DAY 1 ----------
1. Turn on cell exhaust fan located in the stairwell of the SE corner of the cell.
2. Turn on the cell makeup air fan. The disconnect switch is located by the entrance of the cell.
3. Test the sump's emergency overfill interlock by moving the high limit setting on Emergency Sump LN2 Level Photohelic meter slightly lower than zero setting. (The zero setting might have to be raised for the switch to make.) Verify that the EMRG Valve object on the TEMP screen of the Cyro #1 console displays closed. Reset.
4. On Cryo #1 Console, login to the Cryo screen.
5. Toggle to Cryo Bypass Screen.
6. Set Cryo Pressure to 0.10 PSI and record change in logbook.
7. Open manual main fill valve located at top of bus tunnel one-half turn.
8. On TEMP screen of the Cryo #1 console, toggle FILL on.
9. Watch Cryo pressure and verify that the flapper opens at pressure setpoint (usually ~0.5 PSI).
--If flapper does not respond to pressure increase, toggle FILL off and locate and fix problem.
10. Once the LN2 level of the sump indicates that LN2 is present, the manual main fill valve can be opened an additional one and one-half turns.
--Typically, the LN2 in the sump is only increased to a level high enough to precool the pump and test the system for leaks (~7 to 10 inches).
Once this level is reached toggle FILL off and resume filling the next day.
---- DAY 2 ----------
1. Verify Cryo Pressure Setpoint is 0.10 PSI
2. On the TEMP screen of the Cryo #1 console, toggle FILL on.
--PLC sump level limits are 22" for low and 28" for high. Once level reaches the high limit, main fill valve will close and reopen again when lower level drops to lower limit. If this regulation does not occur, toggle FILL off and locate the problem.

C. LN2 Pump Priming Procedure
CAUTION: LN2 PUMP MUST BE PRECOOL AND COMPLETELY SUBMERGED IN LN2 BEFORE OPERATION.
1. Power up pump controller.
2. On TEMP screen of Cryo #1 Console, set system to operate mode
3. On override screen of Cryo #1, set all valves to manual. Set TOP and BOTTOM COVER valves to 50% and all other valves to 0%.
4. Set Pressure setpoint of pump to 3 PSI.
5. To turn pump on, toggle OFF, then CLEAR, then ON, then ACCEPT.
6. Verify a pressure increase on the output of the pump.

D. Vessel Structure and Coil Cooling Procedure
CAUTION: COOLING RATE OF STRUCTURE MUST NOT EXCEED 2 DEG C PER HOUR UNTIL -70 DEG C IS REACHED.
1. Set all coils to automatic and 25 DEG C.
2. Set top cover valve to 25% and bottom cover valve to 5%
-- To prevent over pressuring the pump, all valves can not be closed simultaneously. Therefore, at least one valve must be manually set to remain partially opened. Commonly, this is done with the top cover valve.
3. Lower the coil setpoint in 5 Deg C increments until desired setpoint is reached.

E. LN2 Valve Test Procedure
1. Select a valve to be tested and set it to manual on Override Screen of Cryo #1 Console.
2. Toggle to corresponding trend information on Cryo #2 Console
3. Open valve to ~50% and verify all display information tracks valve and pressure.
4. Close to 0% and verify all displayed information tracks valve and pressure.
--At 0%, pressure at valve's output should be 0. If this is not the case, valve may need adjustment (see LN2 Valve Adjustment Procedure below).
5. Open valve to 100% and verify all displayed information tracks valve and pressure.

F. LN2 Valve Adjustment Procedure
1. Locate and disconnect 120 VAC input for valve in LN2 Valve Cross Connect Box located on the side of the bus tunnel.
2. With a voltage meter, verify 120 VAC has been remove by measuring the voltage at terminals 1 & 2 located inside the valve body.
3. Remove red and black leads coming from the circuit boards at terminals 3 & 4. Tape stripped ends of these wires.
4. Connect wires from cable of adjustment switch as follows: white wire to terminal 1, red wire to terminal 3 & black wire to terminal 4.
5. Plug adjustment switch plug into 120 VAC.
6. With adjustment switch drive actuator in direction (CW) to close valve.
NOTE: When flats of stem are perpendicular to line of flow, valve is closed. Valve is closed when 0 PSI is displayed on the Cryo Console.
7. If necessary, adjust cam #1 to make close limit switch slightly less than closed position (0 degrees). Cam #1 should make switch at -1 to -3 degrees.
8. With adjustment switch drive actuator further CW so that cam #1 makes close limit switch (~-1 to -3 degrees).
9. Set potentiometer so that the resistance on white/black to purple is 110 ohms.
10. With adjustment switch drive actuator in direction (CCW) to open valve while reading the resistance on lead white/black and green from the potentiometer and stop when the resistance is ~110 ohms.
11. Set cam #2 so that it makes open limit switch. When switch is made, there will be continuity between terminal 3 & 6.
12. With adjustment switch, drive actuator to close the valve and stop at approximately one-half closed.
13. Rotate "range" and "zero" pots on board fully clockwise. Rotate "AH" pot fully clockwise and then 1/4 turn counter-clockwise.
14. Unplug adjustment switch from 120 VAC and disconnect from terminal strip of valve.
15. On Cryo console, set valve on manual and 50%.
16. Reconnect red and black leads coming from the circuit boards to terminals 3 & 4, respectively.
17. Reconnect 120 VAC to valve.
18. On Cryo console, change set point of valve to 0%.
19. After actuator has stopped, adjust zero and/or range pots so that valve is closed.
NOTE 1: Rotating zero pot CCW cause actuator to further close valve and rotating range CCW cause actuator to open valve.
NOTE 2: 1st LED on indicates valve is rotating CCW or in direction to open before over travel & 2nd LED on indicates valve is rotating CW or in direction to close before over travel.
20. On Cryo console, change set point of valve to 100%, verify valve opens and stops before cam #2 makes open limit switch.
--If actuator drives turns the valve until switch is made, the zero pot and range pot will need to be adjusted.
21. Repeat steps 19 and 20, until actuator and valve are operating correctly.