Technical Service Bulletin TSB-005

Important Disclaimer

The information in this bulletin is intended exclusively for licensed heating contractors, and is NOT intended for the end user. This material is NOT intended to take the place of the information contained in the manuals shipped with the product.

Use of this information by unqualified personnel may result in property damage, personal injury or death.

End users are asked to contact a qualified contractor for all installation and service work. If you need assistance finding a contractor in your area, contact your Viessmann Sales Representative, or use our Contractor Locator.

By hitting "Yes" below you confirm that you have read, understood and agree to this warning, that you are licensed and hold the current, appropriate licences to work on said equipment in the location and/or jurisdiction of installation.

Applies to:

◾ Vitodens 200-W, B2HA & B2HB Series (all models)
◾ Vitodens 222-F, B2TA & B2TB Series (all models)

How to program the Vitodens boiler to operate with a thermostat

Due to market demand for operating Vitodens 200/222 boilers with a dry contact thermostat while utilizing outdoor reset logic, we are providing the necessary programming changes to allow for this using the instructions below.

Instructions for Heating Circuit 1:

1. Go into Coding Level 2 on the boiler control. To do this, hold down the Menu and OK buttons simultaneously for about 5 seconds, and then hold down the Return and OK buttons simultaneously for about 5 seconds. You should then see "Coding Level 2" displayed on the screen.

2. Go into the General sub-menu.

3. Set the value at coding address "3A" to "1". This setting activates the DE1 contact.

4. Return to the main menu, and then go into the Heating Circuit 1 sub-menu.

5. Set the value at coding address "D5" to "1". This setting initiates the external heating program changeover.

6. Set the value at coding address "D8" to "1". This setting identifies the changeover based on the DE1 contact.

7. Set the value at coding address "F2" to "0". This setting disables the time limit for the external heating program.

8. Set the value at coding address "F5" to "0". This sets the run-on time to zero for the circulation pump in the heating circuit connection set.

9. Set the value at coding address "F8" to "– 61". This setting disables the temperature limit for ending reduced mode.

10. Exit Coding Level 2, open the main menu and then go into the Heating sub-menu.

11. Set the normal day time Room Temperature Setpoint and Heating Curve to whatever values your customer requires.

12. Set the Reduced Room Temperature Setpoint to whatever value your customer requires (e.g. 3°C).

13. Set the Heating Time Program schedules (Monday - Sunday) to " - - : - - – - - : - -".

14. Return to the main menu, and then go into the DHW sub-menu.

15. Set the DHW Time Program schedule (Individual > Monday - Sunday) to "00:00 – 24:00".

16. Exit the main menu. The boiler is now configured to operate with a thermostat for Heating Circuit 1 via contact DE1.

Note:

When the contact at DE1 is closed, the boiler/heating circuit will operate in accordance with the outdoor sensor and the normal day time heating schedule.

When the contact at DE1 is open, the boiler/heating circuit will operate in accordance with the outdoor sensor and the reduced night time heating schedule.

Instructions for Heating Circuit 2:

1. Go into Coding Level 2 on the boiler control. To do this, hold down the Menu and OK buttons simultaneously for about 5 seconds, and then hold down the Return and OK buttons simultaneously for about 5 seconds. You should then see "Coding Level 2" displayed on the screen.

2. Go into the General sub-menu.

3. Set the value at coding address "3B" to "1". This setting activates the DE2 contact.

4. Return to the main menu, and then go into the Heating Circuit 2 sub-menu.

5. Set the value at coding address "D5" to "1". This setting initiates the external heating program changeover.

6. Set the value at coding address "D8" to "2". This setting identifies the changeover based on the DE2 contact.