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Section V Preventative Maintenance
For personal safety and equipment reliability, the following procedures
should only be performed by a qualified technician. Contact our Ser-
vice Department for assistance (see Preface, After-sale Support).
Shut down the system and lock the main circuit breaker in the OFF
position before attempting any preventative maintenance.
Do not remove the bleed off resistors from the capacitor filter. Capaci-
tors carry a residual charge after power down.
Service Contracts
Thermo NESLAB offers on-site Service Contracts that are designed to provide
extended life and minimal downtime for your unit. For more information,
contact our Service Department (see Preface, After-sale Support).
General Guidelines
NOTE:
Each chiller/tool application contains its own set of variables, poten-
tially increasing or decreasing the frequency of action items. See Fluid Degra-
dation Risk Assessment Chart on the next page.
Uninhibited Ethylene glycol (EG) degrades over time and starts to
corrode metal. Draining the system alone will not remove corrosion by-
products. Use system pressure to flush all the componets.
EG is hygroscopic, it will absorb water from its environment. This can
affect the freezing point and boiling point of the fluid over time. This
may result in system failure.
Top-off th system with Uninhibited EG. Do not top-off with water.
Topping-off with plain water can severely effect the freezing point and
boiling point of the fluid. This may result in system failure.
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