Designating Heating Circuits - Only For Weather; Compensated Control; Checking The Gas Type - Viessmann VITODENS 222-F Installation And Service Instructions Manual

Commissioning, inspection, maintenance
Further details regarding the individual steps
7. Secure control unit back in operating
position.
Designating heating circuits - only for weather-compensated
control
In the delivered condition, the heating
circuits are designated "Heating circuit
1" and "Heating circuit 2" (if installed).
If the system user prefers, the heating
circuits can be designated differently to
suit the specific system.

Checking the gas type

The boiler is equipped with an electronic combustion control unit that adjusts the
burner for optimum combustion in accordance with the prevailing gas quality.
■ Consequently, for natural gas there is no adjustment required across the entire
Wobbe range.
The boiler can be operated in the Wobbe index range 9.5 to 15.2 kWh/m
3
54.7 MJ/m ).
■ Convert the burner for operation with LPG (see "Gas type conversion" on
page 29).
1. Determine the gas type and Wobbe
index by asking your local gas supply
utility or LPG supplier.
2. Convert the burner for operation with
LPG (see page 29).
28
(cont.)
Enter names for heating circuits:
Operating instructions
3. Record the gas type in the service
report on page 140.
3
(34.2 to