Check Gas Pipes And Fittings For Leaks; Measure Ionization Current; Verify Programming Unit System Coding Addresses - Viessmann VITODENS 200 Start-Up/Service Instructions

Start-up and Service

Check Gas Pipes and Fittings for Leaks

WARNING
The gas supply piping must be leak tested before placing
the boiler in operation.

Measure Ionization Current

Verify Programming Unit System Coding Addresses

20
CAUTION
Ensure all joints of gas line are pressure tight and that
gas valves do not leak when under normal operating
pressure (use approved leak detection liquid).
IMPORTANT
Switch off heating system on the control unit before
connecting the measuring instrument.
1. Remove burner cover panel (if still installed) as per
the removal and reinstallation instructions on page 6
in this manual, and reinstall panel upon completion
of service work.
2. Connect a DC μA multimeter in series with the
ionization cable as follows:
a) Disconnect the socket of the ionization cable A
from the ionization electrode B and connect to
the plug of the multimeter via adaptor C.
b) Connect additional ionization measuring cable D
to the ionization electrode B and the socket of
the multimeter.
Note: The measurement can be made with a
multimeter (measuring range 0 to 100 μA).
3. Start up boiler to its maximum input:
Turn emissions test switch "S" on the control unit
to "h".
4. If the ionization current is less than 5 μA
check the electrode clearance (see page 17).
check the power supply connection of the control
unit.
Note: The minimum ionization current must be at
least 5 μA when the flame is formed (approx.
2-3 seconds after opening the gas combination
valve).
5. After completing the measurement, turn emissions
test switch to "a".
6. Enter the value measured in the Maintenance Record
on page 73 in this manual.
The control unit must be adjusted to the system
equipment. See page 42 onward for information on
the programming unit.
For details on coding procedure and for an overview
of the coding addresses, see page 45 onward.
Vitodens 200 WB2 Service