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h
Note!
After the set number of hours have expired, the
service interval must be entered in the diagno-
sis mode again.
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 maxi-
mum pump output using the diagnosis system. This
switches the speed control off.
Caution!
a
When using an flow header we recommend turn-
ing off the speed control and setting the pump
output to 100%.
400
300
200
100
0
0
200
400
600
Fig. 7.2 Characteristic pump line for ecoTEC exclusive 832 and 838
Key to Fig. 7.2
1
at 27 kW
2 at 30 kW
ecoTEC exclusive installation and maintenance instructions / 0020017768_02
800
1000
1200
1400
1600
Volumeflow [l/h]
Inspection and maintenance 8
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 increas-
es and turning left decreases it.
2
Fig. 7.3. Setting the by-pass valve
• Regulate the pressure using the setting screw (1).
1
Position of the setting
screw
Right-hand stop (tur-
1800
ned all the way down)
Mid-position (5 turns
to the left)
5 further turns to
the left from the
mid-position
Table 7.4 Setting value for the bypass valve
Pressure
Notes/application
(mbar)
If the radiators do not get pro-
350
perly hot in the works setting
250
Default setting
If noises in the radiators or
170
radiator valves are produced
1
29
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