3. Operation
Defrosting the P-102
User Manual
The system may be operating continuously. It should be turned off any time the fore- or roughing pump
(s) are to be turned off.
Defrosting the P-102
If vacuum pump-down times or ultimate levels degrade, the cold probe may have accumulated enough
frost to affect performance.
1. Close the high vacuum valve and turn off the Cryocooler P-102 unit. The diffusion pump may be left
on or turned off at the user’s option.
2. Leave the fore-pump on to remove the evaporating moisture from the system.
Overnight defrosting is suggested. After defrosting, the P-102 unit can then be turned on again.
Restart the diffusion pump if it also was turned off. Many applications have low moisture loads and
continuous operation for months is possible without defrosting. Those systems with very heavy
moisture loads may require weekly defrosting.
Compressor and Condenser Fan Motors
The compressor and condenser fan motors are lifetime lubricated and do not require regular oiling.
Both the compressor and condenser have temperature switches that turn off either the fan or the
compressor if the motors for either begin to overheat.
Safe Shut Down
The following shut-down procedure is used to remove power from the Cryocooler P-102.
NOTICE
This shut-down procedure is used in the normal shut-down of the Product. This
procedure completely removes the power source and all other facilities to the
product.
1. Turn off the facility power to the P-102 or unplug it from the disconnect.
2. Turn off the ON/OFF switch. The light on the switch turns off.
3. Observe that the sounds of the fan, and condenser stop.
3-23
Brooks Automation
