19
5. HANDLING PRECAUTIONS
Power outage recovery.
DC801 units reset automatically to where operation halted before power loss and resumes
operation when power is restored. When defrosting, the refrigeration system will turn back on
after power is restored. Press the defrost button once again to resume defrosting.
If conditions for resuming operation are unfavorable, turn OFF the power switch (ELB) when
power outage occurs.
Maximum cold trap temperature.
If an excessive amount of fluid is allowed to collect in the cold trap, internal temperature rises and
may overload the refrigeration system.
Do not run successive operations when cold trap temperature is above -40°C.
Refrigeration pressure error
When excessive pressure builds in the refrigeration lines due to refrigeration system overload, a
protection circuit activates the refrigeration error lamp and shuts down the refrigeration unit.
When this happens, turn OFF the main power switch immediately and refer to
“TROUBLESHOOTING” (P.23).
Refrigeration overload relay.
Operation of the refrigerator in the high temperature range may activate the refrigeration
overload relay, which shuts down the refrigeration unit. When this happens, turn OFF the main
power switch and refer to “TROUBLESHOOTING” (P.23).
Condensation.
Condensation may form on unit depending on operating conditions and/or environment. Wipe
any undesired condensation away with a soft, dry cloth or rag.
Vacuum grease application.
Vacuum pressure is weakened and vacuum leaks may occur if any contaminants are allowed to
build up on vacuum connection components. If contaminant buildup is found in any vacuum
connection joints, clean and reapply vacuum grease as needed.
If vacuum valve stem tubes become difficult to rotate, remove the stem tube, apply vacuum
grease, and reinstall.
Normalizing pressure.
Before turning OFF the vacuum pump, following an operation run, confirm that pressure in the
vacuum chamber has returned to normal. If vacuum pump is turned OFF while chamber is
decompressed, oil from the pump may back up into the chamber. Refer to “13. Normalize
chamber pressure” (P.15).
Ampule neck size.
Ampule adapter inner diameter is 7mm. Use ampules with a connection neck size of 7-9mm.
Teardrop flask.
Use TS29 for teardrop flask fitting.
Transporting
Do not tip unit on its side when lifting for transport.
Observe the installation precautions and procedures (P.5-8) when installing/reinstalling unit.
Summary of Contents for DC801
Page 29: ...27 11 WIRING DIAGRAM DC801 ...