INSTALLATION INSTRUCTIONS
28
4.2 Filling the system
Use only a WRAS approved filling loop for
connection and filling of the primary system.
This should be disconnected when not in use.
Check the properties of the water supply and
install the appropriate treatment devices if the
mains water has a hardness rating more than
17.5 °Ck 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.
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 (see fig.1);
•
Open the main domestic water supply valve;
•
Open the external filling loop (see fig.3);
•
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;
•
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 (see fig. 2) to check that
the system pressure reaches 1 bar and that the
code H2O does NOT appear on the control panel
display (see 2.7 “Control Pane”’);
•
If, after the above operations, there is a reduction
in the pressure, re-open the external filling loop
until the pressure gauge reads 1 bar and that the
code H
2
O disappears on the control panel display;
•
On completion, make sure that the external
filling loop is completely closed.
Emptying the central heating system
Whenever it is necessary to empty the system,
proceed as follows:
•
turn off the main power supply switch;
•
wait for the boiler to cool down;
•
turn the system drain tap RS (see fig. 2) and use a
container to collect the water that runs out;
Emptying the domestic hot water system
Whenever there is danger of freezing or any other occurrence, the hot water system could be emptied in the
following way:
•
Shut off the water at the mains;
•
Open all hot and cold water taps;
•
Empty from the lowest point (where possible).
PUMP PLUG
PUMP
AIR VENT VALVE PLUG
AIR VENT VALVE
M
CWI
HF
12-00710
OPTIONAL
Fig. 2
Fig. 1
Fig. 3