Designating Heating Circuits - Only For Weather-Compensated Control Units; 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

Designating heating circuits – only for weather-compensated control units
In the delivered condition, the heating circuits are des-
ignated "Heating circuit 1", "Heating circuit 2",
"Heating circuit ..." (if installed).
If the system user prefers, the heating circuits can be
renamed to suit the specific system.

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 "Gas type conversion" on page 35).

Gas type conversion (only for operation with LPG)

1. To convert the gas type at the control unit, refer to
"Commissioning the system with the commission-
ing assistant" on page 32.
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.
3 3
(34.2 to 54.7 MJ/m ).
Commissioning, inspection, maintenance
To enter names for heating circuits:
Operating instructions
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 (see
page 35).
3. Record the gas type in the report on page 119.
2. Affix label "G31" (supplied with the technical docu-
mentation) adjacent to the type plate on the cover
panel.
35