Viessmann Vitodens 242-F Guide rapide

Installation and service

instructions

for contractors

VIESMANN

Vitodens 242-F

Type B2UA, 3.2 to 26 kW

Gas condensing/solar storage combi boiler

Gas council no.

41-819-18; 41-819-19

Natural gas and LPG version

For applicability, see the last page

VITODENS 242-F

5773 238 GB 4/2013 Please keep safe.

Please follow these safety instructions closely to prevent accidents and mate-

rial 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 envi-

ronmental pollution.

Note

Details identified by the word "Note" con-

tain additional information.

Target group

These instructions are exclusively inten-

ded for qualified contractors.

■ Work on gas installations must only be

carried out by a registered gas fitter.

■ Work on electrical equipment must

only be carried out by a qualified elec-

trician.

■ The system must be commissioned by

the system installer or a qualified per-

son authorised by the installer.

Regulations

Observe the following when working on

this system:

■ Statutory regulations regarding the

prevention of accidents

■ Statutory regulations regarding envi-

ronmental protection

■ Codes of practice of the relevant trade

associations

■ All current safety regulations as

defined by DIN, EN, DVGW, TRGI,

TRF, VDE and all locally applicable

standards

■ Gas Safety (Installation & Use) Regu-

lations

– the appropriate Building Regulation

either the Building regulations, the

Building Regulation (Scotland), Build-

ing Regulations (Northern Ireland),

– the Water Fittings Regulation or

Water Bylaws in Scotland,

– the current I.E.E. Wiring Regula-

tions.

If you smell gas

Danger

Escaping gas can lead to explo-

sions which may result in serious

injury.

■ Do not smoke. Prevent naked

flames and sparks. Do not

switch lights or electrical appli-

ances on or off.

■ Close the gas shut-off valve.

■ Open windows and doors.

■ Evacuate any people from the

danger zone.

■ Notify your gas or electricity

supply utility from outside the

building.

■ Shut off the electricity supply to

the building from a safe place

(outside the building).

Safety instructions

5773 238 GB

If you smell flue gas

Danger

Flue gas can lead to life-threat-

ening poisoning.

■ Shut down the heating system.

■ Ventilate the installation site.

■ Close all doors in the living

space.

Flue systems and combustion air

Ensure that flue systems are clear and

cannot be sealed, for instance due to

accumulation of condensate or other

causes. Ensure a sufficient supply of

combustion air.

Instruct system users that subsequent

modifications to the building characteris-

tics are not permissible (e.g. cable/pipe-

work routing, cladding or partitions).

Danger

Life-threatening poisoning

caused by carbon monoxide in

the flue gas occurs as a result of

leaking or blocked flue systems

or an insufficient supply of com-

bustion air.

Ensure the flue system is in

proper working order. It must not

be possible to close apertures for

interconnected combustion air

supply.

Extractors

Operating appliances that extract air to

the outside (cooker hoods, extractors, air

conditioning units, etc.) can create neg-

ative pressure. If the boiler is operated at

the same time, this can lead to reverse

flow of the flue gas.

Danger

The simultaneous operation of

the boiler and appliances that

extract air to the outside can

result in life threatening poison-

ing due to reverse flow of the flue

gas.

Fit an interlock circuit or take suit-

able steps to ensure a sufficient

supply of combustion air.

Working on the system

■ Where gas is used as the fuel, close

the main gas shut-off valve and safe-

guard it against unintentional reopen-

ing.

■ Isolate the system from the power sup-

ply (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 recon-

nection.

!Please note

Electronic assemblies can be

damaged by electrostatic dis-

charge.

Prior to commencing any work,

touch earthed objects, such as

heating or water pipes to dis-

charge static loads.

Repair work

!Please note

Repairing components that fulfil a

safety function can compromise

the safe operation of your sys-

tem.

Defective components must be

replaced with genuine

Viessmann spare parts.

Safety instructions

Safety instructions (cont.)

5773 238 GB

Auxiliary components, spare and

wearing parts

!Please note

Spare and wearing parts that

have not been tested together

with the system can compromise

its function. Installing non-author-

ised components and making

non-approved modifications or

conversions can compromise

safety and may invalidate our

warranty.

For replacements, use only orig-

inal spare parts supplied or

approved by Viessmann.

Safety instructions

Safety instructions (cont.)

5773 238 GB

Installation instructions

Preparing for installation

Product information.............................................................................................. 7

Preparing the installation...................................................................................... 7

Installation sequence

Installing the boiler............................................................................................... 21

Opening the control unit casing............................................................................ 29

Electrical connections........................................................................................... 30

Closing the control unit casing............................................................................. 39

Fitting the front panels.......................................................................................... 41

Service instructions

Commissioning, inspection, maintenance

Steps - commissioning, inspection and maintenance.......................................... 42

Further details regarding the individual steps....................................................... 45

Code 1

Calling up coding level 1...................................................................................... 85

"General".............................................................................................................. 85

"Boiler" ................................................................................................................. 88

"DHW".................................................................................................................. 89

"Solar".................................................................................................................. 89

"Heating circuit ..."................................................................................................ 90

Code 2

Calling up coding level 2...................................................................................... 97

"General".............................................................................................................. 97

"Boiler".................................................................................................................. 105

"DHW".................................................................................................................. 106

"Solar".................................................................................................................. 108

"Heating circuit ..."................................................................................................ 110

Diagnosis and service scans

Service menu....................................................................................................... 119

Diagnosis.............................................................................................................. 120

Checking outputs (actuator test).......................................................................... 123

Troubleshooting

Fault display......................................................................................................... 124

Fault codes........................................................................................................... 125

Repair................................................................................................................... 137

Index

5773 238 GB

Function description

Control unit........................................................................................................... 151

Internal extensions (accessories)......................................................................... 153

External extensions (accessories)........................................................................ 156

Control functions.................................................................................................. 160

Allocating heating circuits to the remote control................................................... 168

Electronic combustion control unit........................................................................ 168

Designs

Internal connection diagram................................................................................. 170

External connection diagram................................................................................ 171

Connection diagram, solar control module........................................................... 173

Parts lists

Ordering individual parts...................................................................................... 174

Overview of the assemblies................................................................................. 175

Casing.................................................................................................................. 176

Hydraulics............................................................................................................. 178

Cylinder module................................................................................................... 181

Heat cell............................................................................................................... 186

Control unit........................................................................................................... 189

Miscellaneous....................................................................................................... 191

Commissioning/service reports........................................................................ 193

Specification....................................................................................................... 194

Certificates

Declaration of conformity...................................................................................... 195

Manufacturer's certificate according to the 1st BImSchV [Germany]................... 196

Keyword index.................................................................................................... 197

Index

Index (cont.)

5773 238 GB

Vitodens 242-F, type B2UA

Preset for operation with natural gas E

and natural gas LL.

For conversion to LPG P (without con-

version kit), see page 53.

In principle the Vitodens 242-F may only

be delivered to countries listed on the

type plate. For deliveries to alternative

countries, an approved contractor must

arrange individual approval on his own

initiative and in accordance with the law

of the country in question.

Intended use

The appliance is only intended to be

installed and operated in sealed unven-

ted heating systems that comply with

EN 12828, with due attention paid to the

associated installation, service and

operating instructions. It is only designed

for the heating of water that is of potable

water quality.

Intended usage presupposes that a fixed

installation in conjunction with permissi-

ble, system-specific components has

been carried out.

Commercial or industrial usage for a pur-

pose other than heating the building or

DHW does not comply with regulations.

Any usage beyond this must be

approved by the manufacturer for the

individual case.

Incorrect usage or operation of the appli-

ance (e.g. the appliance being opened

by the system user) is prohibited and

results in an exclusion of liability. Incor-

rect usage also occurs if the components

in the heating system are modified from

their intended function (e.g. if the flue

gas and ventilation air paths are

sealed).

Preparing the installation

Handling

If possible, leave the boiler on the pallet

during handling.

If space constraints make it necessary,

the boiler can be split for handling.

!Please note

Prevent damage to the appliance

during handling.

Never set the boiler down on its

front or sides, or apply any load

to these surfaces.

Preparing for installation

Product information

5773 238 GB

Installation

Dividing the boiler into sections

4. 2x

Preparing for installation

Preparing the installation (cont.)

5773 238 GB

12.

10.

11.

Preparing for installation

Preparing the installation (cont.)

5773 238 GB

Installation

13.

14.

15.

Preparing for installation

Preparing the installation (cont.)

5773 238 GB

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