Operating instructions ecoTEC plus 937
8
4.2
Measures prior to commissioning
4.2.1
Opening the isolating valves
h
Note
If the boiler is fitted with a bottom cover the
isolating valves are under this cover.
90˚
4
3
1
2
Fig 4.3 Opening the isolating valves
• The stop cocks in the heating flow and return (
2
and
4
) and the gas stop-cock (
1
) must be open. These stop-
cocks are open if the slot for the screwdriver is
parallel to the piping run.
• The cold water stop cock (
2
) must be open. In order to
check this you can open a hot water tap at a draw-off
point and see if water flows out.
4.2.2 Checking system pressure
bar
i
F
P
bar
1
Fig. 4.4 Checking the filling pressure of the heating system
• Check the filling pressure of the system using the
pressure gauge (
1
) before putting it into operation.
For the heating system to operate properly, the indicator
on the pressure gauge must be in the dark grey zone
when the system is cold. This corresponds to a filling
pressure between 1.0 and 2.0 bar. If the indicator is in
the light grey area (below 0.8 bar), fill the system up
with water before putting it into operation.
h
Note!
The ecoTEC appliances come with a manometer
and a digital pressure indicator.
The manometer allows you to quickly check
whether the filling pressure is in target range or
not even when the appliance is turned off. When
the unit is in operation, you can have the exact
pressure shown in the display. Activate the
pressure display by pressing the "-” button (2).
After 3 seconds the display returns to the feed
temperature.
Note:
Note: To avoid running the system with too
little water and thus prevent damage, your
appliance has a pressure sensor. This signals
the low pressure level if the level falls below
0.6 bar by the water pressure value in the
display flashing.
If the pressure falls below 0.3 bar the unit
switches off. The error message F.22 appears in
the display. Fill the system up with water before
you start up the appliance again.
If the heating system extends over several storeys, the
system may require a higher filling pressure. Ask your
engineer for details.
4 Operation
