108
Curves for Viessmann NTC 10 k
Ω
Outside temperature sensor
100
10
-20
-10
0
10
20
30
Temperature in °C
6
8
20
40
60
80
200
Resistance
in kΩ
Fig. 64
Further sensors
10
1
10
30
50
70
90
110
Temperature in °C
0.4
0.6
0.8
2
4
6
8
20
Resistance
in kΩ
Fig. 65
Fault "A3" on first heat demand after commissioning
When the first heat demand is received, the control
unit checks whether the flue gas temperature sensor is
correctly positioned.
If the flue gas temperature sensor is positioned incor-
rectly (see page 103), commissioning is cancelled and
fault message A3 is displayed.
1.
Check whether the flue gas temperature sensor is
correctly inserted. See previous diagram.
2.
If necessary, correct the position of the flue gas
temperature sensor or replace faulty flue gas tem-
perature sensor.
3.
Press reset button
R
and repeat commissioning.
The check is repeated until it is completed suc-
cessfully.
Checking the pressure sensor
For the installation position of the pressure sensor in
the appliance, see diagram on page 103.
See the
"Process"
menu, under
"Diagnosis"
, to call
up a value for the
"System pressure"
. The system
pressure is determined from the displayed value and
the following graph.
Note
The pressure differential produced by the pumps
affects the
"System pressure"
. Only read off the
"System pressure"
with the pumps switched off.
Maintenance
Checking the temperature sensors
(cont.)
5678 044 GB
Maintenance
Summary of Contents for D2RA
Page 113: ...113 Maintenance Checking the Vitotronic 200 H accessories cont 5678 044 GB Maintenance ...
Page 133: ...133 Parts lists Sorption module hydraulics cont 5678 044 GB Components ...
Page 136: ...136 0001 0002 0003 0004 0005 Fig 83 Parts lists Miscellaneous 5678 044 GB Components ...
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