Allocating Heating Circuits To The Remote Control; Electronic Combustion Control Unit - Viessmann VITODENS 200-W Installation And Service Instructions Manual

Function description

Allocating heating circuits to the remote control

The heating circuit allocation must be
configured when commissioning the
Vitotrol.
Heating circuit
The remote control affects the heating circuit with-
out mixer A1
The remote control affects the heating circuit with
mixer M2
The remote control affects the heating circuit with
mixer M3
Note
One heating circuit can be assigned to
the Vitotrol 200A/200 RF.
Up to three heating circuits can be
assigned to the Vitotrol 300A/300 RF.
Up to 2 remote controls may be connec-
ted to the control unit.
If the heating circuit allocation is later
cancelled, reset coding address A0 for
this heating circuit to 0 (fault message
bC, bd, bE).

Electronic combustion control unit

The electronic combustion controller uti-
lises the physical correlation between
the level of the ionisation current and the
air ratio λ. The maximum ionisation cur-
rent is achieved at an air ratio of 1 for all
gas qualities.
The ionisation signal is evaluated by the
combustion controller and the air ratio is
adjusted to a value between λ=1.24 and
1.44. This range provides for an optimum
combustion quality. Thereafter, the elec-
tronic gas valve regulates the required
gas volume subject to the prevailing gas
quality.
156
Vitotrol configuration
200A/200 RF
H 1
H 2
H 3
To check the combustion quality, the
CO content or the O
2
gas is measured. The prevailing air ratio
is determined with the measured values.
The relationship between the CO
content and air ratio λ is illustrated in the
following table.
300A/300 RF
HC 1
HC 2
HC 3
content of the flue
2
or O
2 2