• Login to maili (instrument host) as nirc
• Turn on level power to the detector:

   p3/det/lvlon 

• Change to the temperature log directory:

   cdlog 

• Monitor the temperatures incrementing every 5 min. using the command:

   tail -f TempLog.dat 

  and keep an eye on the temperatures are in Kelvins. Ambient temps are around 273 K.
• When NIRC warms to -180 C (187 K), attach a vaccum pump to NIRC and begin pumping on the dewar.
• Pump for at least two days
• After ambient temperatures are reached, turn off level sensor.

   ~nirc/p3/det/lvloff 

• Continue to pump on the dewar for atleast two days.
• Valve off the dewar and turn off the pump
• Back fill slowly with dry Nitrogen.

Notes:

• If the detector temperature exceeds 275 K cut power to the instrument (GNIRS law)
• Warm up should take approximately 2 days after LN2 runs out.

Guidlines:

• NIRC will be warmed to ambient temperatures if the time between runs is more than six weeks.
• If the schedule indicates a warm-up is possible, NIRC will not be filled with cryo the day following the last night of observing.
• 5 weeks before the run, place NIRC on the pump
• 4 weeks before the run, warm fill with LN2
• A few days before the run, fill inner can with LHe.