Strebel S-FX 125, Installation Operating & Maintenance Manual

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6.4 Water quality
The system water must be checked periodically (at least twice a year during the seasons of use, as required by
UNI8065) and possibly have a clear appearance and must be within the following parameters:
•
Water PH: From 7 to 8.5.
•
Copper Cu (mg/l): < 0.5 mg/l.
•
Iron Fe (mg/l): < 0.5 mg/l.
•
Chlorides (mg/l): < 50 mg/l.
•
Conductivity (µS/cm): < 200µS/cm.
6.5 Chemical water treatment
The chemical compatibility of several products for treatment of the central heating equipment has been tested on
the heat exchangers and the boilers. See below for the list with the corrosion inhibitors in preventative and curative
treatment for gas fired central heating boilers. If water treatment is required when filling the system or preforming
maintenance an inhibitor should be used. Follow the instructions provided by the inhibitor manufacturer when
adding it to the system.
The following is a list of approved chemical treatments.
Corrosion-/ Scale inhibitors and recommended suppliers
Product Types Fernox Sentinel
Inhibitors Protector F1 / Alphi 11 X100, X500
Noise reducer X200
Universal cleaner Restorer X300
Sludge remover Protector F1, Cleaner F3 X400
Antifreeze Alphi 11 X500
Tightness Leaker Sealer F4
6.6 Condensate Drain
The condense drain is supplied loose within the S-FX boiler casing on delivery, please connect before operating
the boiler.
The condensate drain is placed at the centre and at the bottom of
the boiler and has a hose discharge. Connect this flexible hose to
the sewer system.
Use only plastic parts with the condensate drain. Metal lines are
not allowed.
Blockage of this drain might damage the boiler. The drain
connection is correct when the condensate can be seen flowing
away, e.g. using a funnel. Any damage that might occur, when the
drain is not installed correctly, is not covered by the warranty of the
boiler.
There should be an open connection of the condensate hose into
the sewage system. A possible vacuum in the sewage system
must never give the opportunity to suck on the boiler’s condensate
drain hose.
Maximum condensate flow per S-FX model:
S-FX 70 S-FX 125 S-FX 220 S-FX 320
8.3 litres per hour 14.9 litres per hour 26.7 litres per hour 39 litres per hour
When mounting the bottom part of the condensate trap, before commissioning the boiler and/or after
maintenance, the condensate trap must
ALWAYS be completely filled with water.
This is a safety measure: the water in the condensate trap keeps the flue gases from leaking
out of the heat exchanger via the condensate drain.