Lauda Puridest PD 2 D, Руководство по эксплуатации

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09/2020 Puridest Bi Distillation Apparatus 13 / 32
10 Maintenance, Service and Trouble Shooting
Caution:
Before service and maintenance always let the Double Distiller cool down!
Danger of scaldings!
Caution:
Before opening the Distillation Apparatus and before cleaning always cut off power (pull
the plug or switch the main switch off).
Danger of electrical shocks!
Descaling 10.1
Depending on the degree of hardness of the tap water, the Distillation Apparatus must be descaled in regular intervals. To
do so, remove the glass fittings, the outer hood, the steel condenser of the mono stage and the deflector plate beneath
the condenser (observe exact position for re-assembly).
A suitable descaling agent would be a mixture of 10 % formic acid, 10 % acetic acid and 80 % distilled water. Fill this solu-
tion into the boiler up to the top rim of the lime deposits and heat to maximum 70 °C. Make absolutely sure not to bring
the solution to a boil. For this, close valves (
③
+
⑤
) and switch on the distiller until the temperature is reached. After ap-
prox. 30 minutes, drain the descaling agent/scale mixture through the drain cock "drain mono stage boiler"
⑧
and rinse
the boiler with clear water several times.
Commercial descaling agents, suitable for use with stainless steel, can also be used according to the manufacturer's in-
structions (e.g. rea-calc® of M/s CHEMOTEC GmbH, 63486 Bruchköbel, Germany). Never use any products con-
taining hydrochloric acid! These will lead to damages to heating element, boiler, temperature sensor and the ducts of the
screw connections.
To re-install, fit all removed parts in reverse order, open the valves for water supply (
③
+
⑤
) and switch on the main switch
of the unit. After descalings, the first few litres of distillate produced should not be used as they could contain traces of
vaporized descaling agent. The contents of the bi stage boiler are to be discarded, as well as the first few litres of freshly
produced mono distillate in the bi stage boiler (valve
⑦
).
Sterilising 10.2
By closing the water supply valve for cooling water
③
during operation the clean water area (condensers) can be sterilised
for a maximum of 3 minutes. The steam produced by the heating elements escapes through the exhaust tubes, through
the opened glass valve for mono distillate withdrawal and the outlet tube for bi distillate.
Sterilisation of the condensers may only be carried out under direct supervision.
Caution:
Heavy steam formation.
Danger of scaldings!