Installation instructions S-HR series page 15
8
Filling and venting of unit and
installation
Filling of the installation can be carried out according to
the usual method. In order to read out the central
heating water pressure the unit plug should be plugged
into the socket.
The circulation pump will not begin to operate as long as
the operating lamps are off. The control display will
show a
indication, which means that the control
is signalling insufficient water pressure. If the
installation is filled and the water pressure rises then the
water pressure will automatically be shown with an
alternating
text. If the water pressure rises to
above 1.5 bar then after a short stop text the
indication will appear, which means the water pressure
is sufficient and the unit is ready for operation.
In order to be able to read out a constant water pressure
the Step key should be pressed in and in order to obtain
a constant
readout the Step key should be
pressed briefly again.
If the water pressure in the unit becomes too high (>3.5
bar) a
text appears, by which means the burner
is switched off. After draining the water from the
installation, by which means the water pressure arrives
below 3 bar, the
text disappears and the burner
is activated.
In order to go from a
read-out to a technical
readout the Step key should be pressed for 5
seconds. This read-out can be selected if the user
requires a technical read out. In order to return to the
read-out the Step key must be pressed again for
5 seconds.
8.1 Central heating system
For filling the central heating installation you use the
filling and draining valve.
Filling is done as follows:
- Plug the unit plug into the wall socket and leave the
operating lamps off;
- Connect the filling hose to the cold water tap and let
it fill with water;
- Connect the filled filling hose to the filling and
draining valve and open this valve;
- Open the cold water tap and fill the installation
slowly;
- The unit has an automatic vent which removes the
air which is present;
- Start venting the radiators and pipes at the lowest
point;
- Bring the installation to pressure (1.5 to 2 bar) after
all radiators and pipes have been vented;
- Close the cold water tap and the filling and draining
valve;
- Activate the automatic venting program by pressing
the pump key which means the pump lamp will be
lit. Allow the control to finish its venting program. The
pump will circulate a number of times around the
boiler as well as the central heating installation.
Also, if a three-way valve, if present, this will be
adjusted to the boiler and central heating installation
a number of times. The pump will be stopped
regularly in order to allow possible present air to
escape.
- Check the water pressure and if required top up. The
working pressure in the installation should be bet-
ween 1.5 and 2 bar in cold state.
- After finishing the automatic venting program the key
can be switched off again.
It can take a while before all air has dis-
appeared from a filled installation. Especially
in the first week noises can be heard which
indicate the presence of air. The automatic air
vent in the unit will make this air disappear, by
which means the water pressure can reduce
during this period and therefore topping up
with water will have to be done.
8.2 Hot water supply
Apply the water pipe pressure to the calorifier (open
main valve and/or stop valve of the inlet combination
valve).
Vent the calorifier and the hot water installation by
opening a hot water tap. Leave the tap open for as long
as required until all air has disappeared from the
calorifier and the pipes and only water is flowing from the
tap.
