Installation and maintenance instructions ecoTEC plus 0020031552_0332
The unit does not go to heating mode, the heating pump
runs intermittently and alternately vents the heating cir-
cuit and the hot water circuit. • Use the test programme
as described in Section 8.2.
5.4.1 Checking the filling pressure of the heating
system
bar
bar
1
2
Fig. 5.1 Checking the filling pressure of the heating system
h
Note
The ecoTEC plus 937 is supplied fitted with a
pressure gauge and a digital pressure display.
Using the pressure gauge you can perform a
quick check whether the filling pressure is
within the prescribed range or not, even when
the unit is switched off.
With the unit switched on, you can read off the
exact pressure by pushing the button "-" (2).
For proper operation of the heating system, when the
installation is cold, the pointer on the pressure gauge (1)
should be in the dark-grey area. This corresponds to a
filling pressure between 1.0 and 2.0 bar. If the pointer is
in the light grey area, top up with water.
If the heating system extends over several storeys, the
system may require a higher filling pressure.
5.4.2 Filling device for ecoTEC plus 937
The ecoTEC plus 937 is fitted with a filling loop.
• Push the double check (1) of the filling loop into the
cold water stop valve (2) and secure the double check
valve (1) with the spring clip (4).
• First open the stop valve to perform the filling (3).
• Open the cold water stop valve (2) so that the water
flows into the heating system. Fill the heating system
as described in Section 5.4.3.
• After filling close both stop valves and remove the fill-
ing loop by pulling the double check valve (1) off the
cold water stop valve (2) (see Fig. 5.2).
3
1
4
2
Fig. 5.2 Filling device
h
Note
Both stop valves must be closed during the op-
eration of the heating system and the filling
loop must be removed from the double check
valve again.
1
2
Fig. 5.3 Double check valve separated from the system during
the heating process
5.4.3 Initial filling of the heating system
h
Note
If the water pressure in the heating system is
too low the display switches between error
message F.22 and the display of the actual
pressure when the unit is switched on.
Fill the heating system as follows:
• Open all thermostatic radiator valves.
5 Commissioning, Part I
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