Viessmann Vitocell 100-u Operating instructions

Service instructions

for contractors

VIESMANN

Vitocell 100-U

Type CVUB

Dual mode DHW cylinder with Solar-Set

Vitocell 100-W

Type CVUB/CVUB-A

Dual mode DHW cylinder with Solar-Set

VITOCELL 100-U

VITOCELL 100-W

5838627 GB 2/2019 Please keep safe.

Please follow these safety instructions closely to

prevent accidents and material losses.

Safety instructions explained

Danger

This symbol warns against the risk of injury.

!Please note

This symbol warns against the risk of material

losses and environmental pollution.

Note

Details identified by the word "Note" contain additional

information.

Target group

These instructions are exclusively intended for quali-

fied contractors.

■Work on electrical equipment may only be carried

out by a qualified electrician.

■The system must be commissioned by the system

installer or a qualified person authorised by the

installer.

Regulations to be observed

■National installation regulations

■Statutory regulations for the prevention of accidents

■Statutory regulations for environmental protection

■Codes of practice of the relevant trade associations

■Relevant country-specific safety regulations

Working on the system

■Isolate the system from the power supply (e.g. by

removing the separate fuse or by means of a mains

isolator) and check that it is no longer live.

■Safeguard the system against reconnection.

!Please note

Electronic assemblies can be damaged by elec-

trostatic discharge.

Prior to commencing any work, touch earthed

objects such as heating or water pipes to dis-

charge static loads.

Danger

Hot surfaces can cause burns.

■Before maintenance and service work, switch

OFF the appliance and let it cool down.

■Never touch the hot surfaces of uninsulated

pipes and fittings.

Danger

Floors that are wet, damp or wetted with glycol

based liquids can cause injury due to slipping

and falling.

■Keep the floor clean and dry during installation

and maintenance work.

■Wear non-slip shoes.

Danger

Broken-off fragments of insulation material can

cause death by suffocation if inhaled or swal-

lowed.

■Do not let children play in the installation

room.

■Keep the installation room clean after installa-

tion and maintenance work.

Repair work

!Please note

Repairing components that fulfil a safety func-

tion can compromise the safe operation of the

system.

Replace faulty components only with genuine

Viessmann spare parts.

Safety instructions

5838627

Auxiliary components, spare and wearing parts

!Please note

Spare and wearing parts that have not been tes-

ted together with the system can compromise its

function. Installing non-authorised components

and making non-approved modifications or con-

versions can compromise safety and may inva-

lidate our warranty.

For replacements, use only original spare parts

supplied or approved by Viessmann.

Safety instructions

Safety instructions (cont.)

5838627

1. Information Symbols ................................................................................................. 5

Intended use .......................................................................................... 5

Inspection and maintenance .................................................................. 6

Spare parts lists ..................................................................................... 6

2. Operating principles Ball valve positions ................................................................................ 7

Venting the solar heating water flow (HFs) ............................................ 7

Adjusting the flow rate ........................................................................... 7

Flushing and filling ................................................................................. 7

High limit safety cut-out (HLSC) ............................................................ 7

3. Commissioning, inspec-

tion, maintenance

Steps - commissioning, inspection and maintenance ............................ 8

4. Commissioning/service

reports

................................................................................................................ 12

5. Specification ................................................................................................................ 13

6. Disposal Final decommissioning and disposal ..................................................... 15

7. Declaration of Conformity ................................................................................................................ 16

8. Keyword index ................................................................................................................ 17

Index

5838627

Symbol Meaning

Reference to other document containing

further information

Step in a diagram:

The numbers correspond to the order in

which the steps are carried out.

Warning of material losses and environ-

mental pollution

Live electrical area

Pay particular attention.

■Component must audibly click into place.

■Acoustic signal

■Fit new component.

■In conjunction with a tool: Clean the sur-

face.

Dispose of component correctly.

Dispose of component at a suitable collec-

tion point. Do not dispose of component in

domestic waste.

The steps in connection with commissioning, inspec-

tion and maintenance are found in the "Commission-

ing, inspection and maintenance" section and identified

as follows:

Symbol Meaning

Steps required during commissioning

Not required during commissioning

Steps required during inspection

Not required during inspection

Steps required during maintenance

Not required during maintenance

Intended use

The appliance is only intended to be installed and

operated in sealed unvented systems that comply with

EN 12828 / DIN 1988, or solar thermal systems that

comply with EN 12977, with due attention paid to the

associated installation, service and operating instruc-

tions. DHW cylinders are only designed to store and

heat water of potable water quality. Heating water buf-

fer cylinders are only designed to hold fill water of pot-

able water quality. Only operate solar collectors with

the heat transfer medium approved by the manufac-

turer.

Intended use presupposes that a fixed installation in

conjunction with permissible, system-specific compo-

nents has been carried out.

Commercial or industrial usage for a purpose other

than heating the building or DHW shall be deemed

inappropriate.

Any usage beyond this must be approved by the man-

ufacturer for the individual case.

Incorrect usage or operation of the appliance (e.g. the

appliance being opened by the system user) is prohibi-

ted and results in an exclusion of liability.

Incorrect usage also occurs if the components in the

system are modified from their intended use (e.g.

through direct DHW heating in the collector).

Adhere to statutory regulations, especially concerning

the hygiene of potable water.

Information

Symbols

5838627

Information

DIN 1988 requires a visual inspection and (if neces-

sary) cleaning no later than 2 years after the cylinder

has been commissioned, and thereafter according to

requirements.

Note

We additionally recommend checking the function of

the protective magnesium anode annually. This func-

tion test can be carried out without interrupting opera-

tion, by measuring the earth current with an anode

tester.

Spare parts lists

Information about spare parts can be found on the

Viessmann spare parts app.

Information

Inspection and maintenance

5838627

Information

One ball valve each in the solar heating water flow and

in the solar heating water return within the Solar-Set:

■In line with the pipe run:

–Open

■Perpendicular to the pipe run:

–Closed

■At 45° angle to the pipe run:

–Check valve open

–The 45° angle (towards the right or left) is only

required for filling and draining the system.

Vitosol service instructions

Venting the solar heating water flow (HFs)

Vent at the air vent valve on the air trap.

Adjusting the flow rate

For 3-stage pump: Adjustment via the flowmeter on the

solar heating water return.

For high efficiency circulation pump: Fully open the ball

valve of the flowmeter. The flow rate is regulated elec-

tronically.

Flushing and filling

Implementation via a flush & fill valve on the solar

heating water return.

High limit safety cut-out (HLSC)

Setting the response temperature

Note

The rotary selector is located in the enclosure.

°C

120

110

Fig. 1

1. Open the casing.

2. At the setting scale, select 95 °C.

Resetting the high limit safety cut-out

Note

The water temperature must have dropped by at least

20 K.

Fig. 2

Press reset button A.

Operating principles

Ball valve positions

5838627

Operation

Commissioning steps

Inspection steps

Maintenance steps Page

•1. Filling the DHW cylinder...................................................................................................... 9

• • 2. Shutting down the system

• • 3. Checking the safety valve function

• • 4. Testing the anode earth current with an anode tester...................................................... 9

• • 5. Cleaning the inside of the DHW cylinder........................................................................... 10

• • 6. Checking and replacing the protective magnesium anode (if required)......................... 10

• • 7. Returning the DHW cylinder to use.................................................................................... 11

• • 8. Checking the connections on the water side for tightness

Commissioning, inspection, maintenance

Steps - commissioning, inspection and maintenance

5838627

1. Fill the DHW cylinder on the DHW side.

Note

When the DHW cylinder is pressurised, retighten

the flange cover with a torque of 25 Nm.

2. Check the fittings on the heating water and DHW

sides for leaks and retighten if required.

3. Check the function of the safety valves according

to the manufacturer's instructions.

Shutting down the system

Checking the safety valve function

Testing the anode earth current with an anode tester

Fig. 3

1. Remove cover A and flange insulation B.

2. Remove upper thermometer sensor C.

3. Remove earth cable E from connecting tab D.

4. Connect tester in series across earth cable E and

tab D.

■Current > 0.3 mA: Protective magnesium anode

is OK

■Current < 0.3 mA or no current at all: Inspect the

protective magnesium anode visually (see

page 10).

Commissioning, inspection, maintenance

Filling the DHW cylinder

5838627

Fig. 4

1. Drain the DHW cylinder on the DHW side.

2. Remove flange cover A.

Note

The system can only be cleaned via the upper

flange aperture.

3. To prevent cleaning agents and contaminants

entering the pipework, separate the DHW cylinder

from the pipework.

4. Remove loose deposits with a pressure cleaner.

!Please note

Pointed or sharp cleaning tools will damage

the cylinder interior.

Only use plastic tools to clean the inside.

5. Use a chemical cleaning agent to remove hard

deposits that cannot be removed with a pressure

cleaner.

!Please note

Cleaning agents containing hydrochloric acid

will attack the DHW cylinder material.

Never use such cleaning agents.

Danger

Cleaning agent residues can cause poison-

ing.

Always observe the information provided by

the cleaning agent manufacturer.

6. Fully drain all cleaning agent.

7. Flush the DHW cylinder thoroughly after cleaning.

Danger

Contact with hot components causes damage to

cables.

After installation, cables must not come into con-

tact with hot components.

Checking and replacing the protective magnesium anode (if required)

Check the protective magnesium anode.

We recommend replacing the protective magnesium

anode if it has been reduced down to 7 10-15 mm.

Note

For situations with limited space, a chain anode (on

request) or an impressed current anode (see pricelist)

are available.

Commissioning, inspection, maintenance

Cleaning the inside of the DHW cylinder

5838627

EDF

Fig. 5

1. Reconnect the DHW cylinder to the pipework.

2. Insert new gasket A underneath flange cover B.

3. Fit flange cover with earth cable C. Tighten the

screws with a maximum torque of 25 Nm.

4. Push earth cable C onto tab D.

5. Fill the DHW cylinder on the DHW side. Retighten

the flange cover with a torque of 25 Nm.

6. Fit upper thermometer sensor E.

7. Fit flange insulation F and cover G.

Note

Guide the thermometer lead through the groove in

the flange insulation.

Checking the connections on the water side for tightness

Commissioning, inspection, maintenance

Returning the DHW cylinder to use

5838627