Evacuate Refrigerant Lines; Sealing Refrigerant Lines; Refitting Valve Access Cover - Telemark Cryogenics 1200 Instruction Manual

Telemark Cryogenics Microprocessor Based Cryochillers
2.6.4 When satisfied that the refrigerant lines connections are
secure carefully release the test gas using the refrigerant
manifold. Re-check the metal seal connections to ensure that
they are tight using the torque settings as per 3.5.1 above.
2.6.5 Re-connect the refrigerant manifold so that the low pressure
side(blue hose) is connected to the access valve and the
center yellow hose is connected to a suitable vacuum pump
and evacuate the lines for at least 60 minutes.
Evacuate the refrigerant lines and cryo-coil through the system
access valve to 0.005 mbar or less. As evacuation
refrigeration lines are severely conductance limited a minimum
evacuation time of at least two hours is recommended. Close
the unit's access valve while the vacuum pump is still running.
Close all hand valves and isolate the system before turning the
vacuum pump off.
2.6.6 Close the "access" valve before turning the pump off so it's
tight Then re-fit the brass end cap ensuring that the copper
seal is in place.
In turn working from bottom to top open the cool gas hand
valve, defrost hand valve and finally the return (suction) hand
valve. Open all of the valves fully and then back off/close (turn
clockwise) by about ¼ turn.
2.6.7 Refit the valve access cover. Ensure that the seal around the
valve access cover is properly secured and seal. Failure to do
so result in excessive moisture build up and ice.
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Revision 1.0.7 October 2018