Heidolph VAC control automatic - Manual (Page 47)

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4.4. Use gas ballast
 Make sure that air / gas entry through the ballast valve does not produce reactive, explosive or
otherwise hazardous mixes. In case of doubt use inert gasses. If not sure, get in touch with
Heidolph.
 Using air instead of inert gasses may involve damage to your hardware and/or the
environment, serious injuries, danger to life due to production of hazardous and / or explosive
mixes, if air and substance pumped react in the pump or at the pump outlet port.
Condensable vapors (steam, solvents, ...):
 Open gas ballast valve (refer to picture). Rotate
through 180° to close valve.
 The gas ballast valve being open, final vacuum
specified will not be reached.
 Never load pump with steam before having
reached operating temperature.
Condensate produced:
 Use Woulff flask (optional) and condensate cooler
(optional) (no condensate reflux, controlled condensate collecting).
Not using a condensate cooler at the output end, hazardous substances may escape;
refer to your local regulations !
Check fluid level in Woulff flask and receiving flask of the condensate cooler; empty on condition:
 open clamp, remove condensate cooler, drain condensate.
 aerate system via vacuum fitting, unthread all hoses, and remove Woulff flask, drain
condensate.
Caution: dispose of chemical substance in accordance with local regulations.
4.5. Discontinue operation:
Short-term:
Is there any accumulation of condensate in the pump ?
Allow the pump to run a few extra minutes with open intake stud.
Is there any accumulation of substances in the pump that might degrade pump material ?
 Clean and check pump heads on condition.
Long term:
 Do actions as described for short-term putting out of operation.
 Disconnect pump from system.
 Close manual gas ballast valve.
 Close inlet and outlet ports (e.g. with caps).
 Store pump in a dry place.
gas ballast
(open)