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Draining Systems -- Before draining your system, have the fluid
analyzed by the manufacturer to determine if flushing or cleaning is
actually necessary. If it is, you'll get more of the crud out by
keeping the fluid as hot as possible (200ºF -- 210ºF) while
draining. Also, run the pump until cavitation occurs...this keeps system
contaminants from settling out.
Charging Systems -- Throttle the block valve on
the main pump discharge for cold circulation (or cycle
a gear pump on and off) to prevent pump damage. Add fluid
when the pump cavitates and slowly increase the flow rate
until the entire system is full. Make sure you fill all
the loops.
Heater Startup -- Increase the system temperature
slowly to between 210ºF and 250ºF. Pump cavitation
and expansion tank "geysers" mean there is water in the
system. The only way to completely remove water is to flash
it to the atmosphere. System is dry when pump is stable
at suction temperature of 230ºF.
For full technical data on Draining, Flushing and Charging
your Thermal Oil System, go to:
Technical Data Sheet: Draining, Flushing and Charging
Your Thermal Oil System
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