Viessmann VITORADIAL 300-T Betriebsanleitung

Service instructions

for contractors

VIESMANN

Vitoradial 300-T

Type VR3, 101 to 335 kW

Condensing boiler with heat exchanger

VITORADIAL 300-T

5692820 GB 4/2021 Please keep safe.

Please follow these safety instruc-

tions 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 environmen-

tal pollution.

Note

Details identified by the word "Note"

contain additional information.

Target group

These instructions are exclusively inten-

ded for qualified contractors.

■Work on gas installations may only be

carried out by a registered gas fitter.

■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 per-

son 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 regu-

lations

Safety instructions for working on the system

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.

■Wear suitable personal protective

equipment when carrying out any work.

Safety instructions

5692820

Danger

Hot surfaces and fluids can lead to

burns or scalding.

■Before maintenance and service

work, switch OFF the appliance

and let it cool down.

■Never touch hot surfaces on the

boiler, burner, flue system or pipe-

work.

!Please note

Electronic assemblies can be dam-

aged by electrostatic discharge.

Prior to commencing work, touch

earthed objects such as heating or

water pipes to discharge static

loads.

Repair work

!Please note

Repairing components that fulfil a

safety function can compromise the

safe operation of the system.

Replace faulty components only

with genuine Viessmann spare

parts.

Auxiliary components, spare and

wearing parts

!Please note

Spare and wearing parts that have

not been tested together with the

system can compromise its func-

tion. Installing non-authorised com-

ponents and making non-approved

modifications or conversions can

compromise safety and may invalid-

ate our warranty.

For replacements, use only original

spare parts supplied or approved by

Viessmann.

Safety instructions

Safety instructions (cont.)

5692820

Safety instructions for operating the system

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. Never switch

lights or electrical appliances 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 sup-

ply utility from outside the building.

■Have the power supply to the

building shut off from a safe place

(outside the building).

If you smell flue gas

Danger

Flue gas can lead to life threatening

poisoning.

■Shut down the heating system.

■Ventilate the installation site.

■Close doors to living spaces to

prevent flue gases from spread-

ing.

What to do if water escapes from the

appliance

Danger

If water escapes from the appliance

there is a risk of electrocution.

Switch OFF the heating system at

the external isolator (e.g. fuse box,

domestic distribution board).

Danger

If water escapes from the appliance

there is a risk of scalding.

Never touch hot heating water.

Condensate

Danger

Contact with condensate can be

harmful to health.

Never let condensate touch your

skin or eyes and do not swallow it.

Flue systems and combustion air

Ensure that flue systems are clear and

cannot be sealed, for instance due to

accumulation of condensate or other

external causes.

Ensure an adequate supply of combus-

tion air.

Inform system users that subsequent

modifications to the building characteris-

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

work routing, cladding or partitions).

Danger

Leaking or blocked flue systems, or

an inadequate supply of combus-

tion air can cause life threatening

poisoning from carbon monoxide in

the flue gas.

Ensure the flue system is in good

working order. Vents for supplying

combustion air must be non-seala-

ble.

Extractors

Operating appliances that exhaust air to

the outside (extractor hoods, extractors,

air conditioning units, etc.) can create

negative pressure. If the boiler is oper-

ated at the same time, this can lead to a

reverse flow of flue gas.

Safety instructions

Safety instructions (cont.)

5692820

Danger

The simultaneous operation of the

boiler and appliances that exhausts

air to the outside can result in life

threatening poisoning due to a

reverse flow of flue gas.

Fit an interlock circuit or take suita-

ble steps to ensure an adequate

supply of combustion air.

Safety instructions

Safety instructions (cont.)

5692820

1. Information Symbols ................................................................................................. 7

Intended use .......................................................................................... 7

Product information ................................................................................ 8

System examples .................................................................................. 8

2. Commissioning, inspec-

tion, maintenance

Steps - commissioning, inspection and maintenance ............................ 9

3. Fuel oil Ordering heating oil ............................................................................... 22

■Fuel oil additives ................................................................................. 22

■Combustion improvers ........................................................................ 22

■Biofuels ............................................................................................... 22

4. Water quality Water quality requirements .................................................................... 23

■Prevention of damage due to scaling ................................................. 23

■Prevention of damage due to corrosion on the water side ................. 24

5. Commissioning/service

reports

Water quality .......................................................................................... 25

Maintenance/service .............................................................................. 25

6. Specification ................................................................................................................ 27

7. Decommissioning and dis-

posal

Final decommissioning and disposal ..................................................... 28

8. Certificates EU Declaration of Conformity ................................................................ 29

Manufacturer's certificate ....................................................................... 29

9. Keyword index ................................................................................................................ 30

Index

5692820

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 heating systems that

comply with EN 12828, with due attention paid to the

associated installation, service and operating instruc-

tions as well as the details in the datasheet.

It is only designed for the heating up of heating water.

Commercial or industrial usage for a purpose other

than the heating up of heating water shall be deemed

inappropriate.

Intended use presupposes that a fixed installation in

conjunction with permissible components designed for

this purpose has been carried out.

Every other use will be deemed to be inappropriate.

Any resulting losses are excluded from the manufac-

turer's liability.

Any usage beyond this must be approved by the man-

ufacturer for the individual case.

Intended use also includes the adherence to mainte-

nance and inspection intervals.

Information

Symbols

5692820

Information

Vitoradial 300-T, type VR3

■Fuels: Fuel oil and natural gas

■Permissible operating pressure 4 bar (0.4 MPa)

■Rated heating output 111 to 335 kW

System examples

Available system examples: See

www.viessmann-schemes.com.

Information

Product information

5692820

Information

Commissioning steps

Inspection steps

Maintenance steps Page

•1. Settings at the boiler control unit..................................................................................... 10

••• 2. Check the connections to the neutralising system. Filling with neutralising agent.... 10

•3. Commissioning the system............................................................................................... 10

•4. Checking the burner adjustment...................................................................................... 11

• • 5. Shutting down the system................................................................................................. 11

• • 6. Opening the boiler door..................................................................................................... 12

•7. Cleaning the internal pipes and heating surface............................................................ 12

••• 8. Checking the gaskets and packing cords on the flue gas side

• • 9. Checking the thermal insulation components on the boiler door................................. 13

•10. Inserting the internal pipes............................................................................................... 13

• • 11. Fitting the boiler door........................................................................................................ 14

••• 12. Checking connections and sensor well on the heating water side for tightness

••• 13. Checking the function of the safety equipment.............................................................. 14

••• 14. Checking the function of the pressure switch................................................................ 14

••• 15. Checking the temperature controller setting if a building management system is

used (DCC system)............................................................................................................ 15

••• 16. Checking the expansion vessel and system pressure................................................... 15

••• 17. Checking the firm seating of electrical plug-in connections and cable grommets

••• 18. Checking the heat exchanger gasket............................................................................... 16

• • 19. Cleaning the flue outlet and heat exchanger................................................................... 18

• • 20. Checking the water quality................................................................................................ 19

• • 21. Checking the neutralising system according to the manufacturer's instructions;

replacing used agent

• • 22. Cleaning the sight glass in the boiler door...................................................................... 19

••• 23. Checking the mixer for ease of operation and tightness............................................... 19

•24. Return temperature raising facility................................................................................... 19

••• 25. Checking the installation room ventilation

••• 26. Checking the flue pipe and all connections from the heat exchanger to the flue

system for tightness.......................................................................................................... 19

• • 27. Restarting the system

• • 28. Adjusting the burner.......................................................................................................... 20

•29. Instructing the system user.............................................................................................. 21

•30. Operating and service documents................................................................................... 21

Commissioning, inspection, maintenance

Steps - commissioning, inspection and maintenance

5692820

Make the settings according to the information in chap-

ter "Additional information, coding" in the control unit

service instructions.

To keep the burner cycle ratio as low as possible, set a

variable switching hysteresis.

Check the connections to the neutralising system. Filling with neutralising

agent

Top up the neutralising system with water as neces-

sary. If the neutralising system is found to have dried

out, optimise the system hydraulics to improve its con-

densation properties. Increase the number of mainte-

nance intervals for the neutralising system.

Commissioning the system

Operating and service instructions for the control

unit and the burner

01. Open the boiler door and check that the internal

pipes are fully inserted into the hot gas flues. See

chapter "Inserting the internal pipes".

02. Check that the ventilation air aperture in the instal-

lation room is open.

03. Fill the heating system with water and vent the

system.

Permissible operating pressure: 4 bar (0.4 MPa)

!Please note

Scaling and boiler damage may result if the

system is not operated with fully softened

heating water. Operate boilers only with

softened water.

Observe the instructions in chapter "Water

quality requirements".

04. Enter the amount of fill water and water hardness

into the table in chapter "Checking the water qual-

ity".

05. Check the system pressure.

06. Check the oil level or the gas supply pressure.

07. Open the flue gas gate valve or flue gas damper

(if installed).

08. Check that the cleaning aperture on the flue outlet

is closed.

Danger

Escaping flue gas poses a risk to health.

To prevent flue gas from escaping, always

connect the condensate drain with a trap.

Neutralising system installation and operat-

ing instructions

Note

The trap must always be filled with water. Check

the fill level on commissioning and during mainte-

nance.

Check regularly as there is a risk of the siphon

drying out in non-condensing operation.

09. Open the shut-off valves in the oil or gas line.

10. Start up in the following order

1. Mains isolator

2. Switch for the heating circuit pump

3. ON/OFF switch for the burner

Observe the burner manufacturer's operating

instructions.

11. The dew point range must be cleared as quickly

as possible. To do so, prevent any heat supply to

the consumers when heating the system from

cold. This also applies when restarting after main-

tenance and cleaning work.

!Please note

When the boiler is heating up, unpleasant

fumes and odours can result from outgas-

sing from the thermal insulation, the thermal

block and the paint.

Ventilate the room during commissioning.

Commissioning, inspection, maintenance

Settings at the boiler control unit

5692820

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