Information On Automatic Testing Of The Flue Gas Temperature Sensor; Checking The Gas Type; Gas Type Conversion (Only For Operation With Lpg); Checking The Static Pressure And Supply Pressure - Viessmann Vitodens 222-F Installation And Service Instructions Manual

Commissioning, inspection, maintenance

Information on automatic testing of the flue gas temperature sensor

Immediately after being switched on, the control unit
automatically checks the function of the flue gas tem-
perature sensor.
The display shows: "A".
Checking all connections on the heating water and DHW sides for leaks

Checking the gas type

The boiler is equipped with an electronic combustion
controller that adjusts the burner for optimum combus-
tion in accordance with the prevailing gas quality.
■ For operation with natural gas, no adjustment is
therefore required across the entire Wobbe index
range.
The boiler can be operated within the Wobbe index
range 9.5 to 15.2 kWh/m
■ For operation with LPG, the burner must be conver-
ted (see next chapter "Gas type conversion").

Gas type conversion (only for operation with LPG)

1. Select the gas type in coding address "82":
Calling up code 2
■
■ "General"
■ Select coding address "11" and set value "9".
Confirm with OK. The display shows "11:0".
■ Select coding address "82" and set value "1"
(LPG operation). Confirm with OK.
Select coding address "11" and set value "0".
■
Confirm with OK. The display shows "11:0".
■ End service functions.
Note
Mechanical conversion on the gas train is not pos-
sible.

Checking the static pressure and supply pressure

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.
Operation with LPG
Purge the LPG tank twice on commissioning or
replacement. Vent the tank and gas connection line
thoroughly after purging.
30
3 3
(34.2 to 54.7 MJ/m ).
Note
If the flue gas temperature sensor is positioned incor-
rectly, commissioning is cancelled and fault message
A3 is displayed (see page 79).
1. Determine the gas type and Wobbe index by ask-
ing your local gas supply utility or LPG supplier.
2. For operation with LPG, convert the burner.
3. Record the gas type in the report on page 112.
2. Affix label "G31" (supplied with the technical docu-
mentation) adjacent to the type plate on the cover
panel.