CYBERHANDLER 2 INSTALLATION, OPERATION AND MAINTENANCE MANUAL
EN/05.2019 © STULZ GmbH – all rights reserved
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• Following criterias should be considered for the disinfectant selection:
- Effectiveness in microorganism elimination
- No corrosive for materials to desinfect.
- As health friendly as possible (not irritant, no allergenic, mutagenic or carcinogenic effects,
no unpleasant odor if possible)
Cleaning of plate heat exchanger
See section 8.4 for cleaning instructions of the plate heat exchanger.
Cleaning of water sump
The dirt particles can be removed from the surface of the sump using a high pressure steam
cleaner or scrubbing with a cloth with detergent and clean water.
Make sure that all edges and corners are perfectly clean
Cleaning of piping and pump housing
Pipes, pump housing can be cleaned with a soft cloth and fresh water, eventually adding neutral
soap.
Cleaning of spray nozzles
For cleaning the nozzles, unscrew them and clean them with a commercially available descaling
agent.
8 8
Refrigerant circuit
Maintenance work must only be carried out by a qualified expert
Refrigerant charge – Quantity and Purity
Quantity
- Check the
sight glass
and the
LP switch
(there is no LP switch in units with EC
compressor).
An insufficient charge causes the formation of bubbles in the sight glass or in extreme cases
the triggering of the LP-switch. An operation with an insufficient refrigerant quantity over a
longer period leads to a reduction of cooling capacity and to high superheating temperatures,
which have a disadvantageous effect on the compressor lifetime.
If a leak is detected:
• let out the refrigerant in a collecting device down to a pressure of 1 bar
absolut
• connect a vacuum pump via a pressure gauge station on the high and low pressure side
• extract the refrigerant by the vacuum pump (not by the compressor !) to approx. 0 bar
absolut
.
• dispose the refrigerant according to the national regulations
• fill the circuit with nitrogen to 1 bar
absolut
• repair the leak
• the circuit has to be run dry by several (at least 3x) fillings and extractings of nitrogen,
eventually change the filter drier.
• fill with R410A according to weight (see type plate)
