Viessmann Vitodens 100-W WB1B Series Installation and user guide

Vitodens 100W WB1B - Service and
Maintenance

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Vitodens 100W WB1B
W 10-26: 37-91 MBH input.
W 10-35: 37-118 MBH input.
Natural Gas or LPG (conversion kit supplied with boiler).
Altitudes up to 10,000 ft. (coding change required).
Temperature range 86°F -178°F.
Venting up to 200’ equivalent length.
Outdoor reset, & OpenTherm control compatible.

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Vitodens 100W WB1B
Located on the rating plate mounted on
the left side of the outer cover.
Locating the boiler model number

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Vitodens 100W WB1B
Located inside the outer cabinet on
the left side of the burner
compartment
Locating the boiler serial number

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Vitodens 100W WB1B
There are two screws 1holding the cover in
place.
Loosen the screws before removing the
cover (screws are captive and will remain in
the boiler).
Flip up the control cover panel and lift the
cover off.
Removing The Boiler Cover

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Vitodens 100W WB1B
Inspect the flue gas collar gasket and the flue gas temperature sensor to make sure the seal is
still good, and they are still positioned correctly.
If either of these are damaged or misaligned, flue gas can enter the burner cabinet and cause
damage.
Checking The Flue Collar And Flue Gas Sensor Gaskets

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Vitodens 100W WB1B
The service manual contains drawings that
help to identify the boiler’s components.
The parts catalogue available as a PDF
download on the Viessmann Canada website
will also provide the current part number for
these components.
Parts List

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Vitodens 100W WB1B
Piping Connections
Gas
3/4”
NPT
3/4”NPT
30 psi PRV
Boiler service
fill/purge valve
Boiler service
drain/purge
valve
3/4”NPT

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Vitodens 100W WB1B
Serviceable automatic air vent.
Isolate the boiler’s supply and return connection.
Drain the water from the heat exchanger (~1US Gal).
Remove the hand tight air vent.
Automatic Air Vent And Air Scoop

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Vitodens 100W WB1B
The air vent can be disassembled by pushing down on the top locking ring and turning the
locking ring off.
Lift the top off the vent and disassemble the insides for cleaning.
Usually a good rinse in a sink will be sufficient to remove deposits that can prevent the float from
being buoyant.
Reassemble in the reverse order.
Make sure not to damage the O-ring on the base.
The vent is tightened hand tight into the air scoop.
Servicing The Automatic Air Vent
Locking Ring
O Ring