Commissioning The Burner; Reducing The Maximum Heating Output (If Necessary) - Viessmann MatriX Service Instructions For Contractors

Commissioning, inspection, maintenance

Commissioning the burner

Boiler control unit operating instructions and
■
service instructions
■ Vitocrossal 300, type CT3U service instruc-
tions
■ Neutralising system operating instructions
Danger
CO formation as a result of incorrect burner
adjustment can have serious health implications.
Always carry out a CO test before and after
work on gas appliances.
Tightness test
Gaskets on the boiler door and components that route
flue gas can be checked during operation with an
inspection mirror. If necessary, remove the thermal
insulation components. Traces of condensate on the
outside of the flue gas collector or on sections of ther-
mal insulation also indicate leaks.
Note
It is essential to check the burner setting with the boiler
heated to operating temperature (min. 40 °C). Also
check in the partial load range.
1. Check the heating system pressure.
2. For open flue operation: Check that the ventilation
facility in the installation room is open.
3. Check the gas supply pressure.
4. Open the gas line shut-off valves.
5. Switch ON the mains isolator (outside the installa-
tion room).

Reducing the maximum heating output (if necessary)

The maximum heating output of the burner can be
reduced if required.
Programming unit on the burner control unit
Status Service
R
S
Fig. 4
12
6.
Status Service
S
Fig. 3 Programming unit on the burner control
unit
Switch ON the system ON/OFF switch at the con-
trol unit. If the fault indicator on the control unit illu-
minates and the display on the burner control unit
flashes, first reset the system. To do so, press
reset button R on the burner control unit.
Note
During commissioning, the appliance can enter a
fault state if there are still airlocks in the gas line.
The fault indicator on the control unit illuminates.
Purge the gas line again and reset the burner con-
trol unit.
If the fault persists, the inlet strainer of the gas train
may have become blocked by work carried out on
the gas line.
Danger
Escaping gas leads to a risk of explosion.
First close the shut-off valves in the gas line
again.
Unscrew the flange on the gas train and clean the
strainer. A blocked strainer is not recognised by the
gas pressure test at the flange.
7. Check all gaskets and plugs, and retighten if nec-
essary.
8. Check the boiler door a few days after commis-
sioning. Tighten the screws.
Press the following buttons:
1. Press and hold S for longer than 2 s,
2. repeatedly, until "6" is shown under "Service".
3. S to confirm, "6" is shown under "Status" and "1" is
shown under "Service".
4. S to confirm, "1" is shown under "Status". The cur-
rent value for the maximum heating output in % is
shown under "Service".
R
flashes.