30 Installation and maintenance instructions for uniSTOR 0020111105_00
6.4 Filling the central heating system
The system can be filled using the built-in filling loop
(ecoTEC plus combi boiler only) or via a separate filling
connection that is fitted at an easily accessible location
in the heating circuit. The filling loop must be removed
once filling is complete. If a temporary connection is not
possible due to legal regulations, a closed system filling
pump with a buffer tank must be used.
The heating system is not automatically supplied from
the hot water side of the central heating. Alternative
procedures for filling closed systems can be found in
BS 5449.
i
Do not use the pressure relief valve of the gas-
fired wall-hung boiler for venting.
1
Fig. 6.1 Two port motorised valve
> Place the lever (1) on the two port motorised valve
to "MAN OPEN" and lock it into this position.
> Flush the entire primary central heating system including
the reheating circuit with cold and hot water.
> Flush, fill, and vent the central heating system in
accordance with the installation instructions of the gas-
fired wall-hung boiler.
> Release the lever on the two port motorised valve
by placing it in the "AUTO" position.
1
2
3
4
5
1
2
3
Fig. 6.2 Setting thermostats
> Remove the front cladding (1) from the cylinder.
> Dismantle the electric immersion heater cover.
> Place the cylinder thermostat (2) and the electric
immersion heater thermostat (3) into the central posi-
tion (around 45 ºC) for initial commissioning and to
achieve maximum energy efficiency.
> Commission the gas-fired wall-hung boiler (¬section
6.5) until the cylinder reaches the operating tempera-
ture and all radiators in the system are hot.
> Then drain the entire central heating system again
to remove any residue from the pipes.
> Fill and vent the entire central heating system again as
described in the installation instructions for the gas-fired
wall-hung boiler.
6 Commissioning
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