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COMMISSIONING
3.6 Flushing the heating system
If the heating system contains several heating circuits, these must
be ushed one after the other.
To prevent contamination in the boiler, ush the heating system
prior to commissioning.
− Flush the system prior to connection to the boiler. Isolate
the heating supply and return at the boiler.
− Connect the heating supply to a water connection.
− Connect hose to the heating return of the heating system.
− Route hose from the heating return to a drain.
− Open connected consumers (e.g. radiators).
− Flush the heating system with fresh water until clear water
emerges from the heating return.
− Drain the heating system.
3.7 Filling the heating system
9
CAUTION: Health risk through contaminated drinking water.
− Observe all country-specic regulations and standards re-
garding the prevention of drinking water contamination.
9
NOTICE: System damage through temperature stresses.
− Only ll the heating system when cold (the water supply
temperature must not exceed 104 °F (40 °C).
− During operation, only ll the heating system via the ll
valve in the heating system pipework (return).
Open the automatic air vent valve only briey for venting.
The ll and top-up water quality must comply with the water re-
quirements in this manual.
The pH value of the heating water increases after the heating
system has been lled. After 3 – 6 months (initial service) check
whether the pH value of the heating water has settled down.
− Adjust the pre-charge pressure of the expansion vessel to
the required pressure (only for sealed unvented systems).
− Open the shut-off valves on the heating water side.
− Fill the heating system slowly and observe the pressure
gauge whilst doing so.
− Vent the heating system via the radiator air vent valves.
If the water pressure drops as a result of venting the system:
− Top up the system with water.
− Carry out a leak test in accordance with locally applicable
regulations.
− After the tightness test, reinstate all components that were
taken out of operation.
− Ensure that all pressure, control and safety equipment is
functioning correctly.
Once the boiler has been tested for tightness and no leaks have
been found:
− Set the correct operating pressure. The working pressure
in the heating system should be over 14 PSI but below the
maximum limit specied for the boiler.
− Close the automatic air vent valve.
3.8 Preparing the heating system for operation
Observe the following points during commissioning:
− Before commissioning, vent the heating system via the
ventilation facilities provided for this purpose.
− Check that the inspection opening on the ue gas collector
is closed.
− Check that the combustion chamber door is securely closed.
− Check that the safety equipment (e.g. safety valve, min-
imum and maximum pressure limiters, high limit safety
cut-out) is functioning correctly.
− Check that the required operating pressure has been
achieved.
− Check the ange connections and other connections for
tightness.
− Check the control unit connections and temperature sensor
positions.
− Fill the condensate siphon.
3.9 Commissioning the control unit and burner
By commissioning the control unit you automatically commission
the burner as well. The burner can then be started by the control
unit. For further information, see the installation instructions of
the relevant control unit or burner.
− Use the control unit to commission the boiler.
− Set the control unit parameters.
− Complete the commissioning report in the technical docu-
mentation of the burner.
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