Viessmann Vitodens 100-W, WB1A Installation Instructions Manual

Installation Instructions

for use by heating contractor

Burner Mixture Damper Replacement, Part No. 7374 870

for Vitodens 100-W, type WB1A boilers

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

Please file in Service Binder

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 power 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.

Ensure that the installation
literature of other applicable
components is referenced.

Enclosure Removal

1. Remove the screw at the top of

boiler A.

2. Press down on springs at bottom

of boiler B and remove the front
enclosure panel C.

3. Flip control console down D.

4. Shut off the secondary side of
the boiler and isolate the boiler
from the system.

Note:

The boiler is still filled with water.

5730 003 v1.1 02/2009

Burner Removal

Mixture
Damper
Location

5. Disconnect electrical cables from

gas valve E and ignition
transformer unit F.

6. Remove connection hose D from

air pressure switch.

7. Loosen the fitting C on the gas

connection pipe.

8. Loosen four screws B, remove

burner and disconnect all electrical
cables from blower motor A.

CAUTION

To avoid damage to the burner, do
not lay burner on its cylindrical
burner tube.
Failure to heed this caution may
cause damage to the burner tube,
which may lead to improper
operation.

2

5730 003 v1.1 02/2009

Burner Disassembly and Mixture Damper Replacement

5

ATTENTION

Ensure tab of flapper is pointing downward!

1

2

3

9. Remove two screws 2 and
remove mixture damper 3 located
between burner chassis 1 and

fan motor 5.

10. Remove mixture damper and
discard.

11. Install newly supplied mixture

damper. See picture below (rotate
180°).

12. Reassemble the burner in reverse

order with new burner gasket.

IMPORTANT

Ensure that mixture damper 3 is
correctly positioned. See Attention
below. Check mixture damper for free
movement (opens up in the direction
of the air flow).

2 44.3 inch-pounds (5 Nm)

For tightening, use a calibrated torque
wrench.

IMPORTANT

Perform gas leak testing. Use new
gaskets, if needed.

13. Check the gas connections for
leaks.

WRONG!! CORRECT!!

5730 003 v1.1 02/2009

3

Burner Removal

14. Replace electrical cables from fan

motor A, mount burner, and
diagonally tighten 4 torque screws
B (approx. 3 ft.lbs/4 Nm using a
calibrated torque wrench).

15. Insert new gasket and tighten the

fitting C on the gas connection
pipe.

16. Insert air pressure switch

connection pipe D onto the gas
valve “OUT” connector (P2 on the
switch).

17. Replace electrical cables from gas

valve E, and ignition transformer
unit F.

18. Open gas shutoff valve and switch
on power supply.

Printed on environmentally friendly

(recycled and recyclable) paper.

Viessmann Manufacturing Company (U.S.) Inc.
45 Access Road
Warwick, Rhode Island • 02886 • USA
1-800-288-0667 • Fax [phone]
www.viessmann-us.com • [e-mail]

4

Viessmann Manufacturing Company Inc.
750 McMurray Road
Waterloo, Ontario • N2V 2G5 • Canada
1-800-387-7373 • Fax. [phone]
www.viessmann.com • [e-mail]

5730 003 v1.1 02/2009 Technical information subject to change without notice.