86
Enabling energy manager
Note
The fuel cell module will return into operation only if
"Energy manager OFF"
has been selected on the
programming unit of the gas condensing module.
Extended menu
1.
2.
"Fuel cell"
3.
OK
4.
"Operating mode"
5. / for
"Energy manager OFF"
6.
OK
Terminating maintenance mode
Fuel cell module programming unit
1. Select
"17"
with / .
2. Press and hold
SET
for at least 3 s.
"oFF"
will appear under
STATE
.
Maintenance mode has terminated when the
MNT
indicator is no longer lit. The fuel cell module
switches to control mode.
5-yearly maintenance of fuel cell module
The 5-yearly maintenance work is carried out by
Viessmann Technical Services.
A notification will appear in the control unit display.
Checking the external diaphragm expansion vessel (heating circuit) and
system pressure
Note
The expansion vessel can lose some of its charge
pressure over time. When the boiler heats up, the
pressure gauge will indicate a higher pressure of 2 or
3 bar (0.2 or 0.3 MPa). The safety valve may also
respond and discharge the excess pressure.
Therefore check the expansion vessel pre-charge
pressure annually.
Check whether the installed expansion vessel is ade-
quate for the system water volume (GB only).
Carry out this test on a cold system.
1.
Drain the system until the pressure gauge shows
"0".
Alternatively, close the cap valve on the expansion
vessel and reduce the pressure until the pressure
gauge indicates "0".
2.
If the pre-charge pressure of the expansion vessel
is lower than the static system pressure, top up
with nitrogen until the pre-charge pressure is 0.1 to
0.2 bar (10 to 20 kPa) higher than the static system
pressure.
3.
Top up with water until the charge pressure of the
cooled system is at least 1.0 bar (0.1 MPa), and is
0.1 to 0.2 bar (10 to 20 kPa) higher than the pre-
charge pressure of the expansion vessel.
Permiss. operating pressure: 3 bar (0.3 MPa)
Checking the safety valve function
Checking the firm seating of electrical connections
Commissioning, inspection, maintenance
2-yearly maintenance of fuel cell module
(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 ...
