Viessmann WB2B 80, WB2B 105, B2HA 80, B2HA 88, B2HA 100 Installation Instructions Manual

Installation Instructions

Heat Exchanger Assembly

for use by heating contractor
for Vitodens 200-W WB2B / B2HA

Part Number: 7831454 WB2B 80, 105
Part Number: 7843753 B2HA 80, 88, 100, 285, 311, 352

Safety and Installation Requirements

Please ensure that these instructions are read and
understood before starting any service work. Failure to
comply with these instructions may 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 performed 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 that main power to the equipment being serviced
is off.

Ensure that the main fuel supply valve to the boiler is
closed.

Take precautions to avoid accidental activation of power
or fuel during service work.

Do not perform service work on any component part
without ensuring safe operation of the heating system.
When replacing parts, use original Viessmann or
Viessmann approved replacement parts.

Refer to the Installation and Service
Instructions applicable to this boiler.

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Accessing the Heat Exchanger

Heat Exchanger Assembly Installation

For more details refer to the Installation and
Service Instructions applicable to this boiler.

1. With the electrical power and fuel supply off, open
the control cover and switch the ON/OFF
control switch to OFF.

2. Remove the front enclosure panel.

3. Close the boiler isolation valve or drain the system.

4. Remove the burner assembly.

Replacing Supply Pipe/Sensors/Refractory

1. Remove the Torx screw G (T-25) with the washer
and pull the refractory H straight out.

2. Disconnect electrical connectors from the heating
supply pipe A.

3. To replace the following:

- Remove connecting clip for boiler temperature sensor B.

- Remove 2 Phillips screws for high limit sensor C.

4. Pull off the connecting clip E to disconnect the
pressure gauge hose from the heating supply pipe A.

boiler

Legend

Tighten the following fasteners on assembly:

C 8.9 lb.in. (1 Nm)
D 70.8 lb.in. (8 Nm)
G 35 lb.in. (4 Nm)

5. Remove the two Torx screws (T-40) D at the top
and loosen the compression fitting at the bottom on
the heating supply pipe A and remove pipe with top
O-ring F.

6. Replace parts as required and reassemble as per steps
5 through 1 respectively and torque fasteners per
legend.

2

5698 072 - 02

Heat Exchanger Assembly Installation

Replacing Heat Exchanger/Return Pipe

1. Drain water from the heat exchanger
through the sediment faucet drain valve.

IMPORTANT

Residual water may leak out during disassembly.

2. Remove supply pipe (see Replacing Supply Pipe).

3. Remove the two Phillips screws A under the control
console and slide out. Disconnect all wiring
connectors, remove console and set aside.

IMPORTANT

The control console must be removed to protect it from
accidental water spillage.

4. Loosen by hand and remove the condensate hose B.

5. Disconnect the flue gas temperature sensor plug inside
the boiler from the vent pipe adaptor C.

Legend

Tighten the following fasteners on assembly:

A 8.9 lb.in. (1 Nm)
D 8.9 lb.in. (1 Nm)
J 74 lb.ft. (100 Nm)
F 70.8 lb.in. (8 Nm)
H 70.8 lb.in. (8 Nm)

6. Remove the four Allen screws (4 mm) D and
disconnect the vent pipe adaptor C from the heat
exchanger.

7. Loosen compression fittings on the bottom of both
return pipes J above the shut off valves.

8. Remove the four 13 mm Hex nuts F and remove heat
exchanger G from the boiler.

9. Remove the Torx screws (T-40) H at the top of the
heating return pipes J and remove with O-rings I
and K.

IMPORTANT

Use new gaskets and O-rings on all connections.

10. Replace parts as required and reassemble the heat
exchanger as per steps 9 through 2 respectively and
torque fasteners per legend.

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3

Reconnecting the Boiler

Heat Exchanger Assembly Installation

1. Install the condensate drain pipe with a suitable
gradient. Pull the condensate hose so far out of the
boiler that no unnecessary bends are created inside
the boiler. Check tightness of siphon connection.

IMPORTANT

Ensure the condensate drain pipe is pulled down and
positioned to allow the condensate to properly drain.

2. Discharge condensate from the boiler into the
drainage system, either directly or (if required) via
a neutralization unit (accessory).

Installation Instructions of Neutralization Unit
(if applicable)

IMPORTANT

Pipe ventilation must take place between the siphon trap
and the neutralization unit (if applicable).

IMPORTANT

Do not connect the drain pipe from any other appliance,
such as water softener backwash pipe, to Vitodens con­densate drain pipe.

1. Fill the boiler, bleed air and check for leaks.

Refer to the Installation and Service Instructions
to activate air bleed program.

2. Install burner assembly.

WARNING

Gas leaks can lead to explosions. Check the gas pipe
seals to ensure that there are no leaks.

3. Close control unit.

4. Install front enclosure.

(recycled and recyclable) paper.

5. Place the boiler back in operation.

For more details refer to the Installation and
Service Instructions applicable to this boiler.

Air gap

Technical information subject to change without notice. Printed on environmentally friendly

5698 072 - 02