3. Operation
PFC Operation Manual
58
825160-00, revision B
Operating the PFC with a Cryocoil, Continued
Step Action
Defrost the system
Note:
D
cycle.
EFROST allows the “regeneration” of a cryocoil in preparation for the next vacuum
6.
),
es
erant reaches 20°C. This
Switch the unit into DEFROST using the unit's control panel (see Figure 15 on page 56
or remote control.
Note 1:
Start DEFROST so that the cryocoil is warm before the vacuum chamber reach
atmospheric pressure. A typical DEFROST takes 4 minutes or less. The unit will
terminate DEFROST when the return temperature of the refrig
assures that no additional moisture will condense on the cryocoil from the atmosphere.
7.
The unit automatically goes into STANDBY when DEFROST is complete. Allow the
unit to remain in STANDBY for at least 5 minutes before selecting COOL.
Note:
To shorten the DEFROST cycle, terminate DEFROST early by putting the unit in
STANDBY.
CAUTION
ulating in an undesirable location.
GENERAL HAZARD
If large amounts of water are collected during the vacuum cycle, liquid or ice may
drop from the cryocoil during DEFROST. This could cause minor or moderate injury.
You may need to provide a drip pan or similar device to prevent liquid water from
accum
CAUTION
GENERAL HAZARD
For PFC/PFC and PFC/P users:
Be aware that when defrosting one circuit while the other circuit is in cool, the
temperature of the coil being cooled will increase by up to 20° C. Review the
required temperatures for the affected process to make sure this warming will not
affect your process. If such a temperature is not acceptable, wait until the completion
of this process before performing defrost. Both circuits may be defrosted at once.
End of Procedure
Continued next page
