CryoTiger Recharge

Recharge kits come as two 500 cc gas bottles, each capable of adding 25 psi to the system. The pair costs about $250. Spare gas bottles are kept in the PT storage cabinet in the main; they should be kept at room temperature (do not let them get cold).

Step 1.0 Prepare the area

  1. Eliminate all sources of ignition: heaters, motors, electric tools, concealed flames. Do not smoke. Extinguish concealed flames, pilot lights, and other sources of heat or sparks. Do not use in areas where static electricity sparks may be generated.
  2. Remove all flammable liquids stored in the area.
Step 2.0 System Setup and Check
  1. Make sure that the compressor is turned off and at room temperature. (Hot compressor will cause the system static pressure to read higher than when at room temperature).
  2. Cold end should be fully warmed up to room temperature.
  3. Connect the compressor, the cold end, and the gas lines.
  4. Run compressor for about 15 seconds and shut it off. Let the system pressure stabilize.
Step 3.0 Connect Incremental Gas charge Bottle Assembly
  1. The correct pressure for our system (PT-14 gas with 25-foot flex hose) is 255 psi.
  2. Disconnect the return gas line at the compressor only. Make sure that the gas supply line is still connected to the compressor.
  3. Take a new gas charge bottle. Do not open the manual valve on the bottle. Connect the bottle to the gas return end of the compressor.
  4. Start the compressor and let it run for 5 seconds and then open the manual valve on the bottle.
  5. Wait for 15 to 20 seconds for the charge gas to be sucked out of the bottle. Close the manual valve on the bottle completely.
  6. Shut off the compressor and let the system pressure stabilize.
  7. Disconnect the charge bottle from the compressor.
  8. Check if the system static pressure is within the normal recommended range for the system configuration.
  9. If necessary, use a second gas charge bottle and follow 3 to 8 above.
  10. The system static pressure should be within the allowable range. System is now charged.
  11. Check that the face seal on the aeroquip coupling is seated properly. Connect the return gas to line to the compressor. System is ready to run.

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updated April 13, 1999