69
Draining the machine and an externally closed application
General
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Before draining the unit, the thermal fluid should be at ambient temperature
(approx. 20 °C). If not, let the machine run with a set-point of approx. 20 °C for
a few minutes until the thermal fluid is at a safe temperature.
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Connect one end of a suitable drain hose to the drain of the unit (8), and place
the other end into a suitable container (make sure the hose and container
materials are compatible with the thermal fluid being used.
Draining
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Open the drain valve (4) if available.
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The thermal fluid should flow through the pump case, and drain port into the
container.
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Disconnect the hose from the unit’s circulation flow (1).
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Disconnect the hose from the unit´s circulation return (2).
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Leave the temperature control device open to dry out for some time (without
sealing caps and open drain valve (4).
Changing thermal fluid / internal cleaning
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After emptying the unit as described in the chapter
Draining the machine and an
externally closed application
depending on the thermal fluid, it is possible that
remnants of the oil remain in the machine.
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Connect a short hose between the circulation return (2) and circulation flow (1)
of the unit.
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When having used silicon oils as thermal fluid, use a suitable solvent (e.g.
Mucasol) to clean the internal components such as pump housing, reservoir, etc.
Depending on the amount of contamination, it may be necessary to drain the
solvent off, and repeat the procedure a number of times with clean solvent.
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Afterwards, leave the temperature control device stand for some time (open all
drain valves and have the connections opened).
