FLOWMAX Technologies 120 - Filling the System; Flushing the System

REGULATION INSTRUCTIONS
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4.2 Filling the system
Check the properties of the water supply and install the
appropriate treatment devices if the mains water has a
hardness rating more than 14.5 gpg (250 mg/L) i
n order to
prevent scaling and eventual damage to the D.H.W heat
exchanger.
Use only clean tap water to fill the system.
A pre-filtering system can be installed on the incoming water
supply to help reduce impurities and limestone.
This water heater must have adequate water flowing through it
whenever the burner is on. Failure to do this will damage the
unit and void the warranty.
Once the water pipes have been connected, close the gas feed valve
and fill the system as follows:
• Check that the circulation pump runs freely;
• Check that the plug of the air vent valve has been slackened slightly
to allow air to escape from the system (fig.1);
• Open the main domestic water supply valve;
• Open the filling tap R (fig. 2);
• Unscrew the plug on the pump to remove any trapped air, check that
the pump is free then re-tighten it when water starts to flow out
(fig.1);
• Before switching on the water heater, purge air completely from
the air vent valve positioned on the top of the condensing
exchanger (fig. 3);
• Open the air vents on the radiators and monitor the air evacuation
process. When water starts to flow out of the radiators, close the air
vents;
• Use the pressure gauge M (fig. 2), to check that the systems
pressure reaches the middle of the green area (equal to 1,2 bar, see
fig. 4).
• On completion, make sure that the filling tap R is perfectly
closed.
4.3 Flushing the system