Installation instructions
for contractors
Replacing the control unit
for Vitodens
VIEZMANN
Safety instructions
⚠️ Please follow these safety instructions closely to prevent accidents and material losses.
Safety instructions explained
Please note
This symbol ⚠️ warns against the risk of material losses and environmental pollution.
Note Details identified by the word "Note" contain additional information.
- Installation, initial start-up, inspection, maintenance and repairs must only be carried out by a competent person (heating engineer/installation contractor).
- Before working on the equipment/heating system, isolate the power supply (e.g. by removing a separate mains fuse or by means of a mains isolator) and safeguard against unauthorised reconnection.
- When using gas as fuel, also close the main gas shut-off valve and safeguard against unauthorised reopening.
- Repairing components which fulfil a safety function can compromise the safe operation of your heating system. For replacements, use only original spare parts supplied or approved by Viessmann.
Installation information
Application information
| Part no., replacement control unit | Designation, replacement control unit | Designation, control unit to be replaced |
|---|---|---|
| 7834 245 | VBC 130-A04.100 |
VBC 130-A03.100 VBC 130-A03.200 VBC 130-A03.300 VBC 130-A03.400 |
| 7834 249 | VBC 130-A04.500 | VBC 130-A03.500 |
| 7834 250 | VBC 131-A04.100 | VBC 131-A03.100 |
Calling up coding addresses
When replacing the control unit, some coding addresses have to be input again, subject to system configuration.
If possible, call up the following coding addresses prior to installation and record the set values in the table below.
| Coding address | Set value |
|---|---|
| 82 (gas type) | |
| 06 | |
| 28 | |
| 31 | |
| 6F |
Boiler service instructions
After installation, put these instructions with the boiler service instructions.
Opening the Vitodens
Installation and service instructions. Switch off the power supply. ⚡️
Removing the programming unit and pivoting the control unit down
Diagram shows a control unit with numbered steps for removal.
- Step 1 indicated by arrow.
- Step 2 indicated by arrow.
- Step 3 indicated by arrow.
- Step 4 indicated by arrow.
- Step 5 indicated by arrow.
Please note Electronic assemblies can be damaged by electrostatic discharge.
Before beginning work, touch earthed objects, such as heating or water pipes, to discharge static loads.
Replacing the control unit
Diagram shows detailed steps for replacing the control unit.
- Open the control unit enclosure.
- Undo the bayonet fitting and remove the pressure gauge.
- Disconnect all plugs from the control unit.
Further steps indicated by numbered arrows.
Step 4 indicated by arrow.
Step 5 indicated by arrow.
Step 6 indicated by arrow.
Step 1 indicated by arrow.
Step 3 indicated by arrow.
Step 2 indicated by arrow.
Replacing the control unit (cont.)
- Remove all existing extensions (internal H1 or H2 extension, LON communication module, cascade module) and install them in the new control unit.
- Remove the boiler coding card and insert it into the new control unit.
- Release the locking tabs on the control unit and remove the unit.
- Insert the new control unit into the control unit support and secure with the locking tabs.
- Fit the pressure gauge and secure with the bayonet fitting.
- Re-insert all plugs in the control unit.
- Close the control unit enclosure and pivot up the control unit.
- Insert the programming unit into the new control unit.
Adjusting the control unit to the heating system
Resetting codes to the factory setting
Press the following keys:
- [Key +] + [Key 目] simultaneously for approx. 2 s.
- "Stand. setting? Yes" is displayed.
- [Key OK] to confirm or [Key Up Arrow] / [Key Down Arrow] to select "Stand. setting? No".
Then set the coding addresses as detailed in the table on page 2.
Note The gas type only needs to be converted for operation with LPG. In the delivered condition, the control unit is set up for operation with natural gas.
Starting the boiler
- Fit the front panel.
- Start the boiler and check it is working correctly.
Additional coding addresses
In conjunction with the new control unit, the following coding addresses can additionally be set:
| Factory set code | Possible change | Description |
|---|---|---|
| 16:50 | 16:30 to 16:127 | With cyclical calibration, the boiler is started according to the heating curve. If the start point according to the heating curve is above 50 °C, the boiler is started at 50 °C. The start point for calibration can be adjusted from 30 °C to 127 °C (limited by boiler-specific parameters). |
| 17:42 | 17:30 to 16:127 | With urgent calibration, the boiler is started according to the heating curve. If the start point according to the heating curve is above 42 °C, the boiler is started at 42 °C. The start point for calibration can be adjusted from 30 °C to 127 °C (limited by boiler-specific parameters). |
| 51:0 | 51:1 | System with low loss header: The internal circulation pump always starts when there is a heat demand. System with low loss header: The internal circulation pump only starts when there is a heat demand if the burner is running. |
| 51:0 | 51:2 | System with low loss header: The internal circulation pump always starts when there is a heat demand. System with heating water buffer cylinder: The internal circulation pump only starts when there is a heat demand if the burner is running. |
Additional fault codes
In conjunction with the new control unit, the following fault codes can additionally be displayed:
| Fault code displayed | System characteristics | Cause of fault | Action |
|---|---|---|---|
| E1 | Burner in a fault state | Ionisation current too high during calibration | Check gap between ionisation electrode and burner gauze assembly (see service instructions). In open flue operation, prevent high incidence of dust in the combustion air. Press reset button [Reset Button R]. |
| E2 | Burner in a fault state | Heating water flow rate too low during calibration. Flow switch caused shutdown. | Ensure adequate circulation volume. Check flow switch. Remove scaling and blockages. Press reset button [Reset Button R]. |
| E3 | Burner in a fault state | Heat transfer too low during calibration. Temperature limiter caused shutdown. | Ensure adequate heat transfer. Press reset button [Reset Button R]. |
| E7 | Burner in a fault state | Ionisation current too low during calibration | Check ionisation electrode (see service instructions):
|
| EA | Burner in a fault state | Ionisation current outside permissible range during calibration (excessive deviation from previous level) | Check flue system; remedy flue gas recirculation if required. In open flue operation, prevent high incidence of dust in the combustion air. Press reset button [Reset Button R]. Following several unsuccessful reset attempts, replace the boiler coding card and press reset button [Reset Button R]. |
| Eb | Burner in a fault state | Repeated flame loss during calibration | Check gap between ionisation electrode and burner gauze assembly (see service instructions). Check the allocation of the gas type. Check flue system; remedy flue gas recirculation if required. Press reset button [Reset Button R]. |
For further information on troubleshooting, see the boiler service instructions.
Contact Information
Viessmann Werke GmbH & Co. KG
D-35107 Allendorf
Telephone: +49 6452 70-0
Fax: +49 6452 70-2780
www.viessmann.com
Viessmann Limited
Hortonwood 30, Telford
Shropshire, TF1 7YP, GB
Telephone: +44 1952 675000
Fax: +44 1952 675040
E-mail: info-uk@viessmann.com
viessmann.com
