Viessmann 7856006 User manual

Brand: Viessmann

Model: 7856006

Type: User manual

Viessmann 7856006 is a DHW (Domestic Hot Water) hydraulic assembly designed for use with the Vitodens 100-W B1KA boiler. It ensures a reliable and efficient hot water supply for your home. The 7856006 features a flow sensor, temperature sensor, and DHW sensor to precisely control and monitor the water flow and temperature. Additionally, it includes a pressure sensor and fan sensor to ensure safe operation. With its easy installation and integration with your existing heating system, you can enjoy a continuous supply of hot water for your daily needs.

Please file in Service Binder

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

6192 870 - 01

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

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

6192 870 - 01

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)

6192 870 - 01

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

6192 870 - 01

Reinstalling the Front Panel

1. Install the front panel.

2. Tighten the screws at the bottom of the boiler.

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

Viessmann 7856006 User manual

Viessmann 7856006 User manual

Viessmann 7856006 User manual

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