VIESMANNInstallation instructionsfor heating engineers

Vitodens 333Type WS3A, 6.6 to 26.0 kWCompact gas fired condensing boilernatural gas and LPG version

VITODENS 333

5862 566 GB 3/2004 Dispose after installation

Please follow these safety instructions closely to prevent accidents andmaterial losses.

Safety instructions explained

! Important informationThis symbol warns against therisk of material losses andenvironmental pollution.

NoteDetails identified by the words "Note"contain additional information.

Safety regulations

Installation, initial start-up, inspection,maintenance and repairs must be car-ried out by a competent person(heating engineer/installation contrac-tor).Observe all current safety regulationsas defined by DIN, EN, DVGW, TRGI,TRF, VDE or all locally applicablestandards.

See also the "safety instructions" inthe "Vitotec Technical Guide" folder.Before working on the equipment/heating system, isolate the mainselectrical supply (e.g. by removing aseparate mains fuse or by means of amains electrical isolator) and safe-guard against unauthorised reconnec-tion.Close the main gas shut-off valve andsafeguard against unauthorisedreopening.Electrical assemblies provided on sitemust be type-approved.

Work on gas equipment

This must only be carried out by anapproved gas fitter.Observe all commissioning work spe-cified for gas installations to TRGI orTRF and all local regulations.

Safety instructions

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Preparing for installationProduct information .................................................................................... 4Preparations for boiler installation ............................................................... 5

InstallationInstalling the boiler and making all connections ........................................... 7Flue gas connection.................................................................................... 8Gas connection .......................................................................................... 8Checking anode connection ........................................................................ 9Opening the control unit housing ................................................................. 10Electrical connections................................................................................. 11& Routing connecting cables ....................................................................... 13Closing control unit housing and inserting user interface ............................. 14Front panel installation................................................................................ 15Commissioning and adjustments................................................................. 15

Index

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Vitodens 333, Type WS3A

Set up for operation with natural gas E.The natural gas E version can be converted to natural gas LL or LPG P using aconversion kit.

Product information

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On-site preparations when using a connection set (accessory), see theinstallation instructions of the connection set.

A Cold water G¾"B Heating flow G¾"C Gas connection G¾"D Heating return G¾"E DHW G¾"F DHW circulation G1"

G Drain outlet kit (accessory)H Cable arrangement areaK Wall clearance with connection

set (accessory)L Wall clearance with on-site con-

nection

Preparations for boiler installation

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1. Prepare the primary connections.Thoroughly flush the heating sys-tem.

NoteShould an on-site diaphragmexpansion vessel be required,install this into the heating return. Ifno connection set (accessory) isused, install the on-site fill tap intothe heating return.

2. Prepare the secondary connec-tions. Install the safety assembly(accessory or on-site provision) toDIN 1988 [or local regulations] intothe cold water supply line.

3. Equip the DHW circulation pipewith circulation pump, check valveand time switch.

4. Connect the condensate drain witha pipe vent to the public sewer.

5. Prepare the gas connectionaccording to TRGI or TRF or alllocal regulations.

6. Prepare the electrical connections.& Mains cable: NYM-J 3 x 1.5 mm2,fuse max. 16 A, 230 V~, 50 Hz.

& Accessory cables: NYM with therequired number of conductorsfor the external connections.

& All cables in area "H" shouldprotrude 2 000 mm from the wall.

Preparations for boiler installation (cont.)

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NoteConnect the condensate drain and drain lines from the safety valves with aslope and a pipe vent to the public sewer.

A Connection set (accessory)

Installing the boiler and making all connections

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Connect the balanced flue pipe. Flue gas system installationinstructions.

Gas connection

A Gas connection

Conversion to other gastypes:Conversion kit installationinstructions

Information regarding operationwith LPGWe recommend the installation of anexternal safety solenoid valve wheninstalling the boiler in rooms belowground level.

1. Carry out a leak test.

! Important informationExcessive test pressureleads to damage to the boi-ler and gas train.Max. test pressure150 mbar. If a higher pres-sure is required for leaktests, separate the boilerand the gas train from themains gas supply (undo fit-tings).

2. Purge the gas supply pipe.

Flue gas connection

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A Magnesium anode B Earth cable

1. Remove the flange lid cover. 2. Check whether the earth cable isconnected on the magnesiumanode.

Checking anode connection

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Opening the control unit housing

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Notes regarding the connection of accessoriesFor details of accessories, also observe the separate installation instruc-tions provided.

A Radio clock connection B Vitotrol 100 UTD (only for controlunits operating with a constanttemperature)

C Vitotrol 100 UTA (only for controlunits operating with a constanttemperature)

Electrical connections

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Plug 230 V~fÖ Power supply

& Never interchange cores "L1"and "N".

& Install an isolator in the mainssupply line which simulta-neously separates all non-earthed conductors from themains with at least 3 mm contactseparation.

& Max. fuse rating 16 A.lH & Mains supply - accessories

(230 V ~ 50 Hz). Where the boi-ler is installed in a bathroom orshower room, the mains supplyof accessories outside the wetarea must not be connected tothe control unit. The power sup-ply connection for accessoriescan be made immediately at thecontrol unit, if the boiler isinstalled outside damp areas.This connection is directly con-trolled with the system ON/OFFswitch (max. 3 A).

& Vitotrol 100 UTA& Vitotrol 100 UTD

Low voltage plug! Outside temperature sensor

(only for weather-compensatedmode)Installation& North or northwestern wall, 2to 2.5 m above ground level. Inmulti-storey buildings, in theupper half of the second floor

& Not above windows, doors orventilation outlets

& Not immediately below balconyor gutter

& Do not render over& Two core cable with a maxi-mum length of 35 m and across-section of 1.5 mm2

? Flow temperature sensor for lowloss header (accessories)

% DHW cylinder temperature sen-sor (fitted in the delivered condi-tion)

aVG KM BUS user (accessory)& Vitotrol 200 or 300 remote con-trol

& Vitocom 100& Extension kit for one heatingcircuit with mixer

& Vitosolic& External extension

Electrical connections (cont.)

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Routing connecting cables

! Important informationConnecting cables are damaged if they touch hot components.When routing and securing connecting cables on site, ensure that themaximum permissible cable temperatures are not exceeded.

A Low voltage connectionsB 230 V connectionsC Internal extension

D Main PCBE Communications module

Electrical connections (cont.)

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Closing control unit housing and inserting user interface

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Commissioning and adjustments

For commissioning and adjustment, see service instructions.

Front panel installation

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Viessmann LimitedHortonwood 30, Telford, TF1 7YP, GBTelephone: +44 1952 675000Fax: +44 1952 675040www.viessmann.co.uk