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10.3
Water shortage in mono or bi stage
The heating elements of both distillation stages are monitored by thermostatic low water cut-offs that protect the unit
from overheating. In case of water shortage, the relative distillation stage is cut off, and a red pilot lamp (III or VI) will light
up.
The water level in the boilers is controlled by float switches (① and ②). After a water shortage, resulting in a power cut-
off of the unit from the mains supply, and before restarting, their correct function must be checked by a skilled electrician.
Before re-initiation, let the Distillation Apparatus cool down.
The triggered low water cut-off of the disconnected stage must be reset. For this purpose, loosen the black cap nut at the
bottom left-hand side of the Distillation Apparatus. Inside the thread a small
white plastic pin can be seen that has to be gently pressed inside (e.g. with a pen) until a clicking sound can be heard.
Re-initiate the unit as described in chapter 6.
10.4
Pilot lamp "Clean"
Depending on the degree of impurities in the tap and the growing contamination of the water in the boiler, caused by the
distillation process in the mono stage boiler, foam will form during evaporation of water. Once the foam gets in contact
with the electrode in the mono stage boiler, an electronic impurity detector will switch off the unit, and the red pilot lamp
Clean (IV) will light up.
The boiler must now be emptied through the drain cock "drain boiler mono stage" ⑧ and be rinsed several times with clean
water. The water required for the rinsing process can be fed to the unit by switching it on so that only the mono stage is
active (yellow pilot lamp mono stage (II)).
The operational interruption "Clean" is reset by switching the unit's main switch off and then on again after 10 seconds.
The LAUDA-GFL Puridest Bi Distillation Apparatuses are produced of first class materials. Nevertheless, the unit should
only be subjected to mechanical strain within sensible limits.
Please make sure that no fluids come into contact with cable connections or the electrical parts of the inside unit! The
powder-coated surfaces of the unit can be cleaned with mild detergents, if necessary. Servicings, repairs or modifications
must be carried out according to the General Engineering Standards by competent electricians only.
Only original spare parts must be used. Always demand a detailed confirmation of the carried out
tasks by the person in charge (company, date, signature).
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j Float switch mono stage
k Float switch bi stage
Puridest Bi Distillation Apparatus
II
III
IV
VI
09/2020
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