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flush / drain as required. In some cases, the system may need washing by a suitable
product:
SUGGESTED DOSE
• 2 litres for every 100 litres of primary network
• 1 litre for every 100 litres of the radiator circuit capacity
• 2 litres for every 100 litres of the under floor heating circuit capacity with oxygen
blocking barrier pipes
The system cannot be overdosed with Bionibal and will not cause system damage.
Restore the correct concentration every time the circuit is emptied / topped up
with raw untreated water.
4.5
Initial opening / filling of the unit
The DHW storage tank is hydraulically separated from the primary circuit, however it
should be filled and pressurised before initial unit running. In order to guarantee the safety
and correct functioning of the unit, the start up procedure must be carried out by
competent qualified installation personnel.
To fill the DHW tank proceed as follows:
• Fully open incoming mains water supply to the ModuSat.
• Vent tank via the hot water outlet to fully remove any air from the tank.
• Once this has been completed the tank coil can then be fully primed.
• As the heating and hot water coil share a common hydraulic system and are controlled
via a 3 way diverter valve, the heating circuit and hot water tank must be fully filled and
vented together. This should be done in such a way so as to ensure that all air is
removed prior to system operation (Please refer to hydraulic arrangements pages 5-7
in this manual)
• To open the unit to the primary network, it is critical that the flushing bypass remains
open (in full bypass position). Then slowly open both the primary flow and return
valves. This is to be done slowly to prevent any excessive hydraulic shock to the unit
components.
• Once this has been done the bypass can be slowly closed.
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