56
1.
Check the pre-charge pressure of the diaphragm
expansion vessel. See page 86.
2.
Close the gas shut-off valve.
3.
Open shut-off valves
A
on the heating water side.
4.
Fill the heating system via boiler drain & fill valve
B
on the heating return (to the top or side).
■
Min. operating pressure 1.0 bar (0.1 MPa).
■
Permissible operating pressure 3.0 bar
(0.3 MPa).
Note
If the control unit has not been switched on prior to
filling the system, then the servomotor of the
diverter valve will still be in its central position, and
the system will be completely filled.
5.
If the control unit was already on before filling:
Switch the control unit ON and activate the fill pro-
gram (see next chapter).
6.
Close boiler drain & fill valve
B
.
Activating the filling function
Service menu
1. Press
OK
and
å
simultaneously for approx. 4 s.
2.
"Service functions"
3.
"Filling"
Filling function is enabled.
4. Ending filling function:
Press
OK
or
ä
.
Filling the DHW cylinder
1.
Open the on-site potable water supply (cold water
connection) and one DHW draw-off point.
2.
The DHW cylinder has been completely filled when
no more air flows out of the DHW draw-off point.
Commissioning, inspection, maintenance
Filling gas condensing module and heating…
(cont.)
5775 636 GB
Summary of Contents for C3TB
Page 136: ...136 Troubleshooting Repairs gas condensing module cont 5775 636 GB Diagnosis ...
Page 143: ...143 Parts lists Heat cell assembly 5775 636 GB Components ...
Page 160: ...160 Parts not shown 0009 PCB IU100 B30 Parts lists Fuel cell assembly 5775 636 GB Components ...
Page 161: ...161 Parts lists Fuel cell assembly cont 5775 636 GB Components ...
Page 187: ...187 5775 636 GB ...
