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6

Reinstalling the control unit

1.

Hook in control unit.

2.

Flip control upward and lock into

position.

Reinstalling the front cover panel

1.

Hook in front cover panel.

2.

Press in bottom portion of front
cover panel until it locks into
position.

3.

Fasten with screw at the top part of
the boiler.

Read and follow, where applicable, the
safety instructions of all labels and
stickers attached to boiler surfaces. Do
not remove any of these instructions.
Contact Viessmann if any replacement
labels are required.

Electrical cables may become
damaged if in contact with hot
components.
When running and securing
connecting cables on site, ensure
that the maximum permissible
temperatures of the cables are not
exceeded.

CAUTION

IMPORTANT

Summary of Contents for 7826 987

Page 1: ... system and all external controls has been deactivated Close main gas supply valve Take precautions in both instances to avoid accidental activation of power during service work It is not permissible to perform service work on any component parts ensuring safe operation of the heating system When replacing parts use original Viessmann or Viessmann approved replacement parts Ensure that theVitodens...

Page 2: ... a spring loaded clip A 2 Slide unit to the left to remove The control unit has labels and stickers containing important information Read and follow their respective instructions 3 Tilt down the control to remove back cover shield 4 Release tabs on both sides of the console 5 Expose wiring connectors A IMPORTANT ...

Page 3: ...3 Removing the control unit continued 6 Remove connectors 7 Cut cable tie from the base 8 Remove complete control console from the base left side first ...

Page 4: ...ng from right side 2 Reconnect all wiring harnesses connectors are numbered which correspond to the numbers printed on the circuit board 3 Use two cable ties field supplied to secure the harness to the control base 4 Reinstall back cover shield ...

Page 5: ...F Pump is ON during call for heat After call for heat RT Terminal is satisfied pump post purges for 12 minutes After DHW external heat demand ST Terminal is satisfied pump post purges for 1 5 minutes ON Pump operates continuously 2 OFF Do not adjust 3 OFF Do not adjust 4 OFF Do not adjust S1 Factory default settings for S1 DIP switch 1 Dip switch S1 ...

Page 6: ... at the top part of the boiler Read and follow where applicable the safety instructions of all labels and stickers attached to boiler surfaces Do not remove any of these instructions Contact Viessmann if any replacement labels are required Electrical cables may become damaged if in contact with hot components When running and securing connecting cables on site ensure that the maximum permissible t...

Page 7: ...7 Wiring diagram PUMP PUMP DHW External Connections Field Wiring ...

Page 8: ...smann ca info viessmann ca Viessmann Manufacturing Company U S Inc 45 Access Road Warwick Rhode Island 02886 USA 1 800 288 0667 Fax 401 732 0590 www viessmann us com info viessmann us com 8 Technical information subject to change without notice 7826 988 II v1 0 Printed on environmentally friendly recycled and recyclable paper ...

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