Strebel S-CB+ Series, Installation Operating & Maintenance Manual

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S-CB
+
Boiler Range Manual
21
Higher pressure systems (e.g. in high buildings)
If pressures higher than 4,0 bar occur in the heating system, the best solution is to separate the system from the
boiler by means of a plate heat exchanger. Now the boiler pressure can still be under 4,0 bar and the boiler control
remains as described above.
Without plate heat exchanger, above 4,0 bar, a water pressure switch has to be built into the boiler instead of the
water pressure sensor - the maximum allowed value in the boiler now is 6,0 bar and the boiler control needs to be
adjusted.
6.15 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. A list with the corrosion inhibitors in preventative and curative treatment for
gas fired central heating boilers can be supplied by Strebel Ltd.
6.16 Under floor heating
When using an under floor heating system, the boiler circuit must be separated from the heating circuit with a plate
heat exchanger.
6.17 Flush the system with fresh water
The water of the boiler and heating circuit should be free of any particles, debris and pollution. Therefore the com-
plete installation must always be thoroughly flushed with clean water before installing and using the boiler(s).
6.18 Installation examples
6.18.1 E
XAMPLE OF A STANDARD SINGLE BOILER HEATING CIRCUIT WITH LOW LOSS HEADER
valve
air separator
dirt separator
strainer (water filter)
pressure relief valve
siphon
pump
automatic air vent
expansion vessel
low loss header
BOILER
HEATING ZONE