Technical data

Installation and maintenance instructions ecoTEC exclusive 0020017768_0532
7.2.7 Setting the pump output
The ecoTEC exclusive is fitted with a speed controlled
pump which sets itself to the hydraulic conditions and
the heat demand of the heating system.
Under certain conditions the output of the pump can be
set, in five steps to 53, 60, 70, 85 or 100% of the
maximum pump output using the diagnosis system. This
switches the speed control off.
a
Caution!
When using an flow header we recommend turn-
ing off the speed control and setting the pump
output to 100%.
0
100
200
300
400
0 200 400 600 800 1000 1200 1400 1600 1800
2
1
Volumeflow [l/h]
Lift [mbar]
Fig. 7.2 Characteristic pump line for ecoTEC exclusive 832 and 838
Legend:
1 at 27 kW
2 at 30 kW
7.3 Adjusting the bypass valve
The appliances have a bypass valve.
The pressure can be adjusted between 170 and 350 mbar.
Approx. 250 mbar is preset (mid-position). The pressure
changes by approx. 10 mbar each time the adjusting
screw is rotated. By turning right, the pressure
increases and turning left decreases it.
1
Fig. 7.3. Setting the by-pass valve
• Regulate the pressure using the setting screw (1).
Position of the setting
screw
Pres-
sure
(mbar)
Notes/application
Right-hand stop
(turned all the way
down)
350
If the radiators do not get
properly hot in the works setting
Mid-position (5 turns
to the left)
250 Default setting
5 further turns to
the left from the
mid-position
170
If noises in the radiators or
radiator valves are produced
Table 7.4 Setting value for the bypass valve
7 Adapting the appliance to the heating system