Viessmann 7826 987 Installation Instructions Manual Download

Page: 4 / 8

Installation

Install new control (starting from
right side).

Reconnect all wiring harnesses
(connectors are numbered which
correspond to the numbers printed
on the circuit board).

Use two cable ties (field supplied) to
secure the harness to the control
base.

Reinstall back cover (shield).

Summary of Contents for 7826 987

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 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 ...