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6192 870 - 01 03/2022
Part number: 7856006 DHW hydraulic assembly
for use with: Vitodens 100-W B1KA
Installation Instructions
DHW Hydraulic Assembly
Refer to the Installation and Service
Instructions applicable to this boiler.
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.
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.
for use by heating contractor
Removing the Front Panel
1. Loosen retaining screws (do not remove completely).
2. Remove front panel.
DHW Hydraulic Assembly Installation
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1. Protect the control from water damage.
2. Disconnect piping, gas line, DHW supply/return and
the heating supply/return.
3. Disconnect wiring – flow sensor, temperature sensor,
DHW sensor, pump connector (10 mm clip), pressure
sensor, fan sensor, and the diverting valve.
4. Disconnect the gas line.
5. Disconnect the return pipe mid connection (18 mm clip)
at the bottom.
6. Disconnect the supply pipe (bottom and top).
Replacing the DHW Hydraulic Assembly
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6192 870 - 01
DHW Hydraulic Assembly Installation
7. Remove five screws from the bottom of the heat
exchanger assembly (torx T15).
8. Remove the DHW hydraulic assembly.
9. Remove the water hammer tube (10 mm clip) to give
access to the plate heat exchanger screw.
Replacing the DHW Hydraulic Assembly (continued)
DHW Hydraulic Assembly Installation
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10. Flow limiter is preinstalled with a 14 L/min orifice
(brown). Spare orifice is provided.
11. Disconnect the old circulation pump and install onto
the new assembly.
Replacing the DHW Hydraulic Assembly (continued)
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DHW Hydraulic Assembly Installation
12. Disconnect the old plate heat exchanger.
13. Remove the plate heat exchanger protective cover
(blank plate) (two screws).
Replacing the DHW Hydraulic Assembly (continued)
14. Install the plate heat exchanger.
15. Reinstall the DHW Hydraulic Assembly in reverse
order onto the boiler using new gaskets and O-rings
provided.
DHW Hydraulic Assembly Installation
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6
Reinstalling the Front Panel
1. Install the front panel.
2. Tighten the screws at the bottom of the boiler.
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6192 870 - 01
DHW Hydraulic Assembly Installation
Technical information subject to change without notice. Printed on environmentally friendly
(recycled and recyclable) paper.
6192 870 - 01
DHW Hydraulic Assembly Installation
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