Viessmann 7826 987 User manual

Safety and Installation Requirements
Please ensure that these instructions are read and understood before commencing installation. Failure to comply with the
instructions listed below can cause product/property damage,severe personal injury, and/or loss of life.
Working on the equipment
The installation, adjustment, service,
and maintenance of this product must
be done by a licensed professional
heating contractor who is qualified and
experienced in the installation, service,
and maintenance of hot water boilers.
There are no user serviceable parts on
the boiler, burner, or control.
Ensure main po er supply to
equipment, the heating 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.
hen replacing parts, use original
Viessmann or Viessmann approved
replacement parts.
Ensure that theVitodens 100
Service Instructions are
referenced.
Remove front cover panel and expose control
1. Remove the screw at the top of
boiler .
2. Press down on springs at bottom
of boiler and remove the front
enclosure panel .
3. Flip control console down .
7826 988 II CA 03/2009
Please file in Service Binder
Installation Instructions
for use by heating contractor
Replacement of Control Console ,Part No. 7826 987, 7826 988
for Vitodens 100- B1A
D
A
C
B

2
Removing the control unit
1. Flip control unit down and out
towards you. The control unit is held
in place with 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 follo 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

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).

4
Installation
1. Install new control (starting 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).

5
Installation (continued)
5. Reinstall front cover panel.
6. Verify DIP switch settings.
DIP s itch settings - S1
Dip s itch
number
Setting Explanation
1 OFF Pump is ON during call for
heat. After call for heat
(RT-Terminal) is satisfied
pump post-purges for 12
minutes.
After DH /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 s itch
1Dip switch S1

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 follo , here 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 ith hot
components.
When running and securing
connecting cables on site, ensure
that the maximum permissible
temperatures of the cables are not
exceeded.
CAUTION
IMPORTANT

7
Wiring diagram
PUMP
PUMP
DHW
External Connections (Field iring)

Viessmann Manufacturing Company Inc.
750 McMurray Road
aterloo, Ontario •N2V 2G5 •Canada
1-800-387-7373 •Fax [phone]
www.viessmann.ca •[e-mail]
Viessmann Manufacturing Company (U.S.) Inc.
45 Access Road
arwick, Rhode Island •02886 •USA
1-800-288-0667 •Fax [phone]
www.viessmann-us.com •[e-mail]
8
Technical information subject to change without notice.
7826 988 II v1.0 Printed on environmentally friendly
(recycled and recyclable) paper.