United Kingdom

Installation and service manual

High- efficiency wall- hung boilers

Baxi Avanta Heat Only

15h - 18h - 24h - 30h

page 1


Dear Customer,

Thank you for purchasing this appliance.

Please read this manual carefully before using the product and keep it in a safe place for future reference.

In order to ensure continued safe and efficient operation we recommend that the product is regularly maintained. Our Service and After Sales organization can assist with this.

We hope you will receive many years of satisfactory service.

A Trading Division of Baxi Heating UK Ltd (3879156)

Brooks House, Coventry Road, Warwick. CV34 4LL

After Sales Service 0844 871 1525

Technical Enquiries 0844 871 1555

Website www.baxi.co.uk

page 2


Contents

Introduction
1 Safety.
  1.1 General safety
  1.2 Safety during assembly and installation
  1.3 Safety during installation, inspection and maintenance
    1.3.1 Health and safety information
2 Installation
  2.1 Scope of delivery.
  2.2 Mounting the boiler
    2.2.1 Installation / maintenance clearance requirements
    2.2.2 Dimensions and connection points.
    2.2.3 Mounting the boiler
  2.3 Water- side connections
    2.3.1 Water flow
    2.3.2 System Pump
    2.3.3 Pressure loss of the boiler
    2.3.4 Open- Vented System
    2.3.5 Sealed systems.
    2.3.6 Additional guidelines for the domestic and CH water
    2.3.7 Water treatment
    2.3.8 Safety valve discharge
    2.3.9 Draining Provision
    2.3.10 Connecting the 'CH return'
    2.3.11 Connecting 'CH flow'
    2.3.12 Connecting condensate drain.
  2.4 Gas- side connections.
    2.4.1 Additional guidelines for gas connections
    2.4.2 Adjusting boiler to other gas- type
    2.4.3 Connecting the gas supply
  2.5 Flue terminal and air supply connections
    2.5.1 Flue terminal positions.
    2.5.2 Room sealed flue
    2.5.3 Connecting the flue terminal and air supply
  2.6 Electrical connection
    2.6.1 The control unit
  2.7 Connecting external controls
    2.7.1 Connecting an on/off control - room temperature (volt free switching)
    2.7.2 Connecting a time control using an external 230 V clock
    2.7.3 Connecting a 230 V time clock in combination with a modulating room control.
    2.7.4 Connecting a modulating control - room or outside compensation.
    2.7.5 Connecting an outside temperature sensor
    2.7.6 Connecting the DHW sensor/thermostat.
    2.7.7 Connecting a three- way valve
    2.7.8 Connecting a frost thermostat
    2.7.9 Connecting an external interlock
    2.7.10 Connecting remote alarm and boiler run indication
    2.7.11 Connecting a PC/PDA
  2.8 Connecting an external pump
  2.9 Wiring diagram
  2.10 Commissioning
    2.10.1 Control Panel
    2.10.2 Additional guidelines for commissioning
    2.10.3  Putting the boiler into operation
    2.10.5 Error during the start- up procedure
    2.10.6 Read out settings
    2.10.7 Adjust the boiler according to the system
    2.10.8 Changing the parameters at service level (with access code)
    2.10.9 Changing the maximum output (Hi) for CH operation
    2.10.10 Restore factory settings
  2.11 Putting the boiler out of operation
    2.11.1 Boiler with frost protection, during longer periods of non- use.
    2.11.2 Boiler without frost protection, during longer periods of non- use
3 Inspection and maintenance
  3.1 Inspection
    3.1.1 Checking the flue pipes and air supply pipes for leaks.
    3.1.2 Checking the condensate siphon
    3.1.3 Checking the ignition electrode
    3.1.4 Checking the combustion
  3.2 Maintenance
4 Errors
  4.1 General
  4.2 Error codes
  4.3 Control stop or lock- out
  4.4 Error code memory
    4.4.1 Error read outs
    4.4.2 Deleting errors
5 Service parts
  5.1 General
6 EC declaration
7 Regulations
  7.1 EC regulations
  7.2 Baxi factory test
  7.3 Additional guidelines
8 Technical specifications and working principle
  8.1 Technical data.
  8.2 The boiler components
  8.3 Working principle
    8.3.1 Regulating
    8.3.2 Advanced boiler control ('abc®' - control)
    8.3.3 Regulating the water temperature
    8.3.4 Low flow / water protection
    8.3.5 High Limit temperature protection
9 Efficiency data and gas efficiency labels
  9.1 Annual efficiency
  9.2 Water- side efficiency

 
Benchmark places responsibilities on both manufacturers and installers. The purpose is to ensure that customers are provided with the correct equipment for their needs, that it is installed, commissioned and serviced in accordance with the manufacturer' s instructions by competent persons and that it meets the requirements of the appropriate Building Regulations.
The Benchmark Checklist can be used to demonstrate compliance with Building Regulations and should be provided to the customer for future reference. Installers are required to carry out installation, commissioning and servicing work in accordance with the Benchmark Code of Practice which is available from the Heating and d Hotwater Industry Council who manage and promote the Scheme.
  Visit www.centralheating.co.uk for more information.

page 3


page 4


Introduction

Fig.1 Baxi Avanta

The Baxi Avanta is a series of wall mounted high- efficiency fully condensing central heating boilers, for open vented systems

These technical instructions contain useful and important information for the correct installation, operation and maintenance of the Baxi Avanta boiler.

Note

Read these instructions carefully before putting the boiler into operation, familiarise yourself with their control functions and operation, strictly observing the instructions given. Failure to do so may invalidate warranty or prevent the boiler from operating correctly.

The installation, commissioning, Inspection and servicing of the boiler must be carried out by a competent registered Engineer who holds valid ACS certification and in accordance with current gas safety (installation and use) regulations, the building regulations and all other relevant codes of practice.

All electrical work must be carried out by a competent Engineer and to be installed in accordance with the current IEE regulations. It is the responsibility of the installer to ensure that all flue systems are installed in accordance with manufacturers instructions and all the requirements of EN 14471.

Note

On commissioning the certificate in the Benchmark Checklist within the installation + service manual must be completed and left on site with a copy send on to Baxi for registration purposes.

If you have any questions, require an engineer to call on site, or if you need more information about specific subjects relating to this boiler, or it's installation please do not hesitate to contact our technical help line 0844 871 1525.

Note

When contacting Baxi with a problem on the boiler please have available the boiler type, Serial No (located on the bottom of the casing), and the symptoms or fault code (the fault code is a series of flashing red digits in the display panel).

The data published in these technical instructions is based on the latest information (at date of publication) and may be subject to revisions. We reserve the right to continuous development in both design and manufacture, therefore any changes to the materials or technology employed may not be retrospective nor may we be obliged to adjust earlier supplies accordingly.

page 5


1 Safety

1.1 General safety

The following pictograms are used in this Installation and Service manual to specifically draw certain points to your attention:

Danger of electric shock
Serious personal injury can occur because of risk of electric shocks.
Warning
Possible danger of personal injury or material damage to the regulator, building or environment.
Note
Useful tip or practical advice.
See
Important instruction in carrying out a particular operation.

1.2 Safety during assembly and installation

Observe the appropriate safety measures, as given in these instructions.

Warning

Can you smell gas? What to do:

Warning

If the leak is before the gas meter, alert your gas supplier, TRANSCO, tel. 0800 111 999

Warning

Can you smell smoke or flue gasses? What to do:

1.3 Safety during installation, inspection and maintenance

Under the Gas Safety (Installation & Use) Regulations 1998, the Baxi Avanta, in common with all gas appliances, must be installed by a competent person in accordance with that regulation.

Statutory regulations, in any country, cannot be overridden by any of the notes or instructions from the manufacturer.

Compliance with National Standards does not provide any degree of immunity from legal obligations. In the UK, the installation must be in accordance with the national and local norms and requirements.

For any issues or circumstances not addressed within these instructions, please call our After Sales Department 0844 871 1525.

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Baxi Avanta HO - PIN: 0063BQ3009

Gas Council numbers:

Baxi Avanta 15h - Heat Only:
Baxi Avanta 18h - Heat Only:
Baxi Avanta 24h - Heat Only:
Baxi Avanta 30h - Heat Only:
41-075-95
41-075-96
41-075-97
41-075-98

See

Classification type for evacuation of the combustion products; according EN 483: see par. 8.1.

1.3.1 Health and safety information

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2 Installation

2.1 Scope of delivery

Fig.2 Scope of delivery

The standard delivery of the boiler includes:

This Installation and Service manual deals with the standard supplied boiler only. For the installation or assembly of any optional accessories supplied with the boiler, such as stand off frame, pipe work kits, cover plate, control kits, etc, please refer to the Assembly Instructions supplied with these accessories.

2.2 Mounting the boiler

Packed in the box with the boiler box is this Installation and Service manual. Read instructions and remarks carefully. This section includes the guidelines and instructions for the connection of gas, water, electricity, safety devices, the regulator, control unit, flue discharge and air supply.

2.2.1 Installation / maintenance clearance requirements

The gas connection is located on the bottom of the boiler whilst the water connections, air inlet and flue gas outlet are located on the top of the boiler. The boiler is supplied as standard with gas pipe work tails.

Fig.3 Clearance requirements

For installation, servicing and inspection min. 600 mm in front of the boiler is required. If this free space is obtained by opening a door or removing a panel, the boiler may be installed for instance in a closed cupboard. All servicing / inspection / repairs are made from the front of the boiler.

For ease of installation we recommend clearances of 0.5 cm at the side so that the unit is easy to open, with a free space of 25 cm under the appliance and 25 cm above the appliance, as the minimum requirement. t.

However once installed, it is possible to reduce these clearances to 22 cm at the top, and 25 cm at the bottom provided the boiler front panel can be removed and the isolating valves are easily accessible without the use of tools"

Note

Clearances shown are for ease of installation - once fitted it is possible to enclose the boiler in a cupboard with 25 mm clearances around the casing provided a door is included to allow the front cover to be removed completely for maintenance and allowance is made to access the gas valve and flow / return connections.

page 8


2.2.2 Dimensions and connection points

Fig.4 Dimensions and connection points of the Baxi Avanta

 

Return connection Ø 22 mm

 

Flue duct Ø 60 mm (concentric)

Flow connection Ø 22 mm

 

Condensate drain connection ¾"

Gas connection Ø 22 mm

 

(standard overflow pipe size)

Combustion air inlet Ø 100 mm (concentric)

   

Note

page 9


2.2.3 Mounting the boiler

Fig.5 Mounting the boiler

Warning

Note

2.3 Water- side connections

2.3.1 Water flow

The central heating system should not require a bypass, unless all radiators are fitted with TRV' s or when the system controls could allow the boiler and pump to operate when there is no flow. Where a bypass has

to be fitted, the bypass must be placed at least 1.5 metres away from the boiler.

The 'abc®' control also monitors the temperature difference across the flow and return connections and the rate of temperature rise and will automatically regulate the boiler output to ensure that it remains operational for as long as possible without the need to 'lock out' requiring a manual reset.

2.3.2 System Pump

The system pump must be wired directly to the boiler terminal strip and be capable of providing the nominal flow at design conditions against the combined resistance of the boiler and system.

Tab.1 Required water flow

Required water flow at T = 15°C and 11° C

Type

T 15°C

T 11°C

m3/h

l/s

m3/h

l/s

Avanta 15h

0,88

0,24

1,14

0,32

Avanta 18h

1,05

0,29

1,37

0,38

Avanta 24h

1,41

0,39

1,82

0,51

Avanta 30h

1,76

0,49

2,28

0,63

page 10


2.3.3 Pressure loss of the boiler

Fig.6 Pressure loss graph

  1. Avanta 15h, 18h
  2. Avanta 24h, 30h

2.3.4 Open- Vented System

The feed and expansion tank must be situated at a minimum height of 1 metre and a maximum height of 30 metres above the boiler to provide the correct operating head pressure.

The cold feed must be at least 15 mm and the open vent must be at least 22 mm. The pipes must rise continuously from the system. The heating vent must be at least 450 mm above the water level in the feed and expansion cistern.

The pump should be fitted on the flow pipe from the boiler and have isolating valves each side.

Fig.7 Open- Vented system

2.3.5 Sealed systems

If the boiler is installed on a sealed system, an appropriately sized expansion vessel and a safety valve MUST be installed close to the inlet side of the pump. A mains filling loop MUST be installed close to the outlet side of the system pump, along with automatic air vents positioned in the system pipe work to ensure adequate system venting during filling and operation. An adequate pressure gauge should be fitted in a position where it can be seen during filling of the system. All in accordance with the current issue of the relevant British Standards.

page 11


2.3.6 Additional guidelines for the domestic and CH water

Flush the pipes and radiators thoroughly before connecting the boiler to the central heating system in accordance with BS 7593 (1992).

Warning

2.3.7 Water treatment

If used correctly water treatment can improve the boilers efficiency and increase the anticipated life expectancy of the boiler. For further information a special document "Quality requirements CH water" is available from Baxi.

As most systems contain a variety of metals, it is considered good practice to provide some form of water treatment in order to prevent or reduce the following:

Warning

All scale deposits however small will reduce the efficiency of the boiler and should be prevented.

Suitable chemicals and their use should be discussed with a specialist water treatment company prior to carrying out any work (environmental aspects, health aspects). The specification of the system and manufacturers recommendations must be taken into account, along with the age and condition of the system. New systems should be flushed thoroughly to BS 7593 (1992) to remove all traces of flux, debris, grease and metal swarf generated during installation. Care to be taken with old systems to ensure any black metallic iron oxide sludge and other corrosive residues are removed, again by power flushing, ensuring that the system is drained completely from all low points.

Note

Please ensure that the new boiler plant is not in circuit when the flushing takes place, especially if cleansing chemicals are used to assist the process.

It is important to check the inhibitor concentration after installation, system modifications, filling the system and every service in accordance with these instructions. For the correct dosage and the suitability of inhibitors for use with our boilers and for further information on water treatment or system cleaning we advise direct contact with either of the following companies:

'F1®' manufactured by:
Fernox, Cookson Electronics
Forsyth Road
Sheerwater Woking
Surrey GU21 5RZ
Tel No: 01483 793200
Fax No: 01483 793201
Email: admin@fernox.com
Web site: www.fernox.com

or:

Sentinal 'X100®' manufactured by:
The Heath Business & Technical Park
Runcorn
Cheshire,
WA7 4QX
Tel No: 0800 389 4670
Fax No: 0800 389 4677
Email: info.uk@sentinel-solutions.net
Web site: www.sentinel-solutions.net

page 12


2.3.8 Safety valve discharge

A pressure relief safety valve is not needed for Open-Vented systems.

2.3.9 Draining Provision

Drain points must be provided at all the low points of the system to ensure that the entire system can be completely drained. The boiler is provided with a drain in the return pipe.

2.3.10 Connecting the 'CH return'

Fig.8 Connecting CH return

2.3.11 Connecting 'CH flow'

Fig.9 Connecting CH flow

page 13


2.3.12 Connecting condensate drain

Fig.10 Connecting condensate drain

Note

2.4 Gas- side connections

2.4.1 Additional guidelines for gas connections

Warning

Before installation, check that the gas meter has sufficient capacity for the demand. Remember to consider the consumption of all household appliances.

2.4.2 Adjusting boiler to other gas- type

The boiler is suitable for both natural gas and LPG firing. For LPG a kit with restrictor is required.

The boiler is supplied as standard set for natural gas (G20), therefore the following procedure must be carried out BEFORE the boilers are fired and commissioned for the first time on LPG:

2.4.3 Connecting the gas supply

Fig.11 Connecting gas supply

Warning

page 14


2.5 Flue terminal and air supply connections

The boiler is only suitable for room sealed operation with a standard concentric connection 60/100 mm Ø or the optional 80/125 mm Ø connection. Detailed recommendations for air supply and flue terminals are given in BS 5440.

Note

It should not be necessary to provide compartment ventilation when the boiler is used with a standard concentric flue.

2.5.1 Flue terminal positions

The flue terminal must be located with care to ensure that the products of combustion are dispersed properly in all weather conditions and cause minimum nuisance to the building user or any adjacent buildings. If the terminal is positioned less than 2 m above the ground, balcony, or flat roof where access by persons is possible a suitable guard must be employed.

Note

The boiler will produce a water vapour plume during normal operation. Positions for the boiler are shown in the figure and table 02.

The principle of the 1:1 gas valve ensures the Avanta range is able to deliver it' s full output at inlet pressure down to 17 mbar. However if dynamic pressure below 19 mbar are experienced ensure this is adequate for ALL other gas appliances in the property.

Fig.12 Flue terminal positions

Tab.2 Minimum distances to terminal

Terminal Position with Minimum Distance

A (1)

Directly below an opening, air brick, opening window, etc.

300 mm

B (1) 

Above an opening, air brick, opening window, etc.

300 mm

C(1) 

Horizontally to an opening, air brick, opening window, etc.

300 mm

D (2) 

Below gutters, soil pipes or drain pipes

25 mm

E (2) 

Below eaves

25 mm

F (2) 

Below balconies or car port roof

25 mm

G (2) From a vertical drain pipe or soil pipe 25 mm
H (2) From an internal or external corner 25 mm
I Above ground, roof or balcony level 300 mm
J From a surface or boundary line facing a terminal 600 mm
K From a terminal facing a terminal (Horizontal flue)
From a terminal facing a terminal (Vertical flue)
1200 mm
600 mm
L From an opening in carport (e.g. door, window) into the dwelling 1200 mm
M Vertically from a terminal on the same wall 1500 mm
N Horizontally from a terminal on the same wall 300 mm
R From adjacent wall to flue (vertical only) 300 mm
S From an adjacent opening window (vertical only) 1000 mm
T Adjacent to windows or openings on pitched and flat roofs 600 mm
U Below windows or openings on pitched roofs 2000 mm

(1) In addition, the terminal should be no nearer than 150 mm to an opening in the building fabric formed for the
purpose of accommodating a built- in element such as a window frame.
(2) Only ONE 25mm clearance is allowed per installation.
If one of the dimensions D, E, F, G or H is 25mm then the remainder MUST be as B.S.5440- 1.

page 15


2.5.2 Room sealed flue

See table 03 for the maximum pipe length of flue ducts and air supply pipes for this 'room sealed' application. It is not necessary to provide combustion air to the room or internal space in which the boiler is installed.

Tab.3 Maximum pipe lengths for flue duct and air supply in room sealed application

Maximum length 'L' allowed

Eq. Length of elbow

Boiler type

60/100 mm

80/125 mm

60/100 mm

80/125 mm

Avanta 15h

8 m

34 m

   

Avanta 18h

8 m

34 m

Avanta 24h

8 m

34 m

Avanta 30h

8 m

34 m

Note

For flue installations not covered by this booklet, please contact our our Technical Enquires: 0844 871 1525.

page 16


2.5.3 Connecting the flue terminal and air supply

Fig.13 Connecting flue terminal and air supply

Note

2.6 Electrical connection

Fig.14 Electrical components with live 230 V

Danger of electric shock

When the switch spur is on the following components of this appliance can be live (230 V):

page 17


2.6.1 The control unit

The boiler has an electronic regulation and control unit with an integrated ionisation flame detector. The heart of the boiler control unit is a microprocessor, the 'abc®' , which controls and protects the boiler.

The maximum rated input of the boiler is 150 W. The boiler is fully prewired internally, all external connections can be made using the terminal strips X5 - X7 - X9 and 230 V input (X2 terminal). See the diagram for the position of the connectors and fuse (F2) on the control unit. The most important properties of the control unit are summarized in table 04.

Tab.4 Control unit characteristics

Manufacturer

Sit Controls

Supply voltage

230 V - 1ph - 50 Hz

Pre- purge time

3 s

Post- purge time

5 s

Ignition time

2.5 s

Safety time

5 s

Anti- cycling time

3 till 10 min.

Fuse value F1 (230 V)

2 AT

DC fan

24 VDC

Fig.15 The control unit

Warning

Any loads other than those specified above are only allowed if an isolating transformer is used.

The output of the boiler can be controlled in the following ways:

  1. On/off control - volt free switching - The boilers internal control will modulate the output to achieve the flow temperature set point of the boiler. This contact is on the X9 terminal strip (low voltage only).
  2. On/off control - 230 V switching - The boilers internal control will modulate the output to achieve the flow temperature set point of the boiler. This contact is on the X2 terminal strip (230 VAC only).
  3. Modulated control - Open Therm - The external controls will modulate the boiler' s output to achieve the flow temperature determined by the modulating regulator. This contact is on the X9 terminal strip (low voltage only).
  4. Modulated control - Open Therm in combination with an externally mounted simple 230 V switching time clock - The boiler will provide room compensated heating and time control over CH and DHW (System boiler).

Note

page 18


2.7 Connecting external controls

Fig.16 Connecting external controls

Danger of electric shock

Isolate power supply at the fused spur before carrying out any work on the boiler controls.

page 19


Fig.17 Boiler External Connection terminal details

2.7.1 Connecting an on/off control - room temperature (volt free switching)

The boiler can be connected to a 2- wire on/off volt free heating control, programmer or thermostat. Mount the thermostat in a reference room usually the living room.

Fig.18 Wiring diagram on/off control

See

If a room thermostat with an anticipation resistor is being used, parameter should be changed from to , see par. 2.10.8.

page 20


2.7.2 Connecting a time control using an external 230 V clock

Fig.19 Wiring diagram for an external 230 V time clock

Danger of electric shock

When the switch spur is on, the terminal strip X2 will be live (230 V).

Warning

For this option to function correctly, a link or room control must be fitted between connectors 7 and 8 of X9 terminal strip (remove existing link before use).

If the 230 V supply for the external time clock is not taken from the boiler - terminal block X2 connections 4 & 5, it must be taken from the same phase as the boiler 230 V supply and correct polarities observed.

2.7.3 Connecting a 230 V time clock in combination with a modulating room control

With an externally mounted simple 230 V switching time clock connected to connectors on X2 terminal strip and a qSense connected to connectors 7 and 8 of X9 terminal strip (remove existing link), the Baxi Avanta will provide room compensated heating and time control over CH and DHW.

Note

An OpenTherm® room modulating control (qSense) used in conjunction with a simple external 230 V time clock will provide easy to set up and operate - timed room compensation heating.

2.7.4 Connecting a modulating control - room or outside compensation

The boiler has an OpenTherm® interface. This enables our modulating range of OpenTherm® room controls (e.g. the Baxi qSense or iSense) to be connected without any further modifications.

If the DHW water temperature on the OpenTherm® control can be adjusted, then the Baxi Avanta will supply water at the temperature determined at the OpenTherm® with the maximum being set in the boiler. OpenTherm® is an industry standard modulating control available from several control manufacturers.

Fig.20 Wiring diagram modulating regulator

Note

The Baxi Avanta can therefore be controlled directly by any other controls with this OpenTherm® logo

page 21


2.7.5 Connecting an outside temperature sensor

An outside temperature sensor can be connected to connectors 1 and 2 of the X9 terminal strip. The boiler will regulate the output using the set point of the internal heat curve. This can be set as follows:

Fig.21 Wiring diagram outside temperature sensor

Note An outside sensor used in conjunction with a simple 230 V time clock will provide easy to set up and operate - timed weather compensation heating based on the above graph.

Fig.22 Heat curve Baxi Avanta

2.7.6 Connecting the DHW sensor/thermostat

If an external DHW calorifier is being used with the Avanta system boiler a DHW control sensor or volt- free thermostat can be connected to connectors 3 and 4 of the X9 terminal strip. The control will automatically detect whether a sensor or a thermostat has been connected.

Fig.23 Wiring diagram DHW calorifier sensor or thermostat

2.7.7 Connecting a three- way valve

If required a 230 V DIVERTING three- way valve can be connected to terminal X5 of the control unit. When used in conjunction with an "Open Therm" compensator the DHW- production operates with priority.

Connector X5- 1 for N (neutral), connector X5- 2 for "open valve to DHW" (port A of three- way valve) and connector X5- 3 for " open valve to CH (port B of three- way valve)

Fig.24 Wiring diagram three- way valve

Note

If port A is connected to heating and port B to hot water X5- 3 should be used to enable DHW.

The cable must be fed through the boiler' s casing by means of the supplied cable gland and run trough the cable clamp on the right- hand inside of the boiler.

page 22


2.7.8 Connecting a frost thermostat

The boiler must be installed in a frost- free area to prevent the condensate drain from freezing. However if the temperature of the CH water in the boiler drops too low, the integrated boiler protection device is activated as follows:

Fig.25 Wiring diagram for frost thermostat

Note

If a 230 V switching time clock is connected to terminal strip X2, the frost thermostat wired as indicated (on connectors 7 and 8 of the X9 terminal strip) it will not bring the boiler on if the time clock is in the OFF position. In these cases the frost stat must be connected in parallel with the time clock on connectors 1 and 4 of the X2 terminal strip (frost stat contacts to close on temperature fall).

Note

Warning

2.7.9 Connecting an external interlock

The boiler is supplied with an external interlock function. A volt free switching device (i.e. external gas pressure switch, safety thermostat for under floor heating) can be connected to connectors 5 and 6 of the X9 terminal strip after removing the existing link. When this circuit is open the boiler will shut down with the display showing (code ) and will restart when the circuit is closed. .

Fig.26 Wiring diagram for an external interlock

page 23


2.7.10 Connecting remote alarm and boiler run indication

Fig.27 Connecting remote alarm

Warning

* Never connect a pump directly to connectors 1 and 3 on terminal X7, but only via a relay.

2.7.11 Connecting a PC/PDA

Using the optional Recom interface package a PC or PDA can be connected to the X10 "telephone connector". Using the Recom PDA service software you can load, change and download various boiler settings and readings. See the user instructions supplied with the software/hardware.

Fig.28 X10 socket connector

Note

Not all PDA will run the Recom software - check with Baxi before buying a unit.

2.8 Connecting an external pump

Connect the system pump to terminal X4 (X4- 1 and X4- 2) of the control unit. The pump' s earth connection must be connected to the control unit' s earth connection with an AMP- connector (supplied with boiler). The cable must be fed through the boiler' s casing by means of the supplied cable gland and run trough the cable clamp on the right- hand inside of the boiler.

Fig.29 Connecting external pump

page 24


2.9 Wiring diagram

WIRE COLOURS
BK BLACK
BL BLUE
BR BROWN
GN GREEN
GN/YW GREEN/YELLOW
GY GRAY
RD RED
WH WHITE
YW YELLOW
BOILER COMPONENTS
As Flow sensor
GCV Gas combination valve
HLT High limit thermostat
Os Outdoor sensor
P Pump
Rs Return sensor
S DHW sensor/thermostat
T Compensator / Open Therm
- - - - Will not be supplied or wired.

Fig.30 Wiring diagram

2.10 Commissioning

2.10.1 Control Panel

The control panel of the Baxi Avanta has 4 function keys and a LED display. The function keys are used to read or change the settings and temperatures.

  1. display
  2. [reset] key
  3. [-] key 4
  4. [+] key
  5. [enter] key

The display has two positions and displays information on the current operating status of the boiler and any errors. Numbers, dots and/or letters can appear in the display.

If no key is pressed for longer than three minutes with the "boiler in standby mode", only one dot is lit. With the "boiler operating", two dots are displayed (Factory default).

Fig.31 Control Panel

page 25


2.10.2 Additional guidelines for commissioning

Fig.32 Benchmark checklist

Warning

The boiler must not be put into operation with a different type of gas without reference to par. 2.4.2

2.10.3 Putting the boiler into operation

This section details the procedure for putting the boiler into operation. There are 7 stages to the procedure:

  1. Isolating the power supply and opening the front cover;
  2. Checking the connections and making the boiler operational;
  3. Switching the boiler on and setting the controls;
  4. Checking/setting the gas/air ratio at full load;
  5. Checking/setting the gas/air ratio at low load;
  6. Making the boiler ready for use;
  7. Instructing the user.

page 26


  1. Isolating the power supply and opening the front cover

Fig.33 Isolating power

  1. Checking the connections and making the boiler operational

Note

Open the valves on all the radiators connected to the central heating system before filling the system with water.

Fig.34 Open the valves

Warning

Avoid water getting into the boiler.

page 27


Warning

  • The boiler has been factory tested for natural gas at 20 mbar.
  • The minimum gas inlet pressure is 17 mbar for natural gas.
  • The minimum gas inlet pressure is 37 mbar for LPG.

Fig.35 Measurement point c on the gas block

Fig.36 Check electrical connections and thermostat

  1. Switching the boiler on and setting the controls

Fig.37 Power on and controls on heat demand

page 28


  1. Checking/setting the gas/air ratio at full load

The boilers are suitable for both natural gas and LPG firing (restrictor required for LPG not supplied). The boilers are supplied as standard set for natural gas (G20), therefore the following procedure must be carried out BEFORE the boilers are fired and commissioned for the first time on LPG:

Fig.38 Check the gas/air ratio control - set to full load - gas/air ratio adjustment A on gas block

Tab.5 Checking/setting values full load CO2 and O2 (front panel not fitted)

Checking/setting values O2/CO2 for natural gas (G20)

Boiler type

Checking

Setting

O2 (%)

CO2 (%)

O2 (%)

CO2 (%)

Avanta 15h

5.2 ± 0.2

8.8 ± 0.3

5.2 ± 0.1

8.8 ± 0.1

Avanta 18h

5.2 ± 0.2

8.8 ± 0.3

5.2 ± 0.1

8.8 ± 0.1

Avanta 24h

5.2 ± 0.2

8.8 ± 0.3

5.2 ± 0.1

8.8 ± 0.1

Avanta 30h

5.2 ± 0.2

8.8 ± 0.3

5.2 ± 0.1

8.8 ± 0.1

Tab.6 Checking/setting values full load CO2 and O2 (front panel not fitted)

Checking/setting values O2/CO2 for LPG (G31)

Boiler type

Checking

Setting

O2 (%)

CO2 (%)

O2 (%)

CO2 (%)

Avanta 15h

5.1 ± 0.2

10.3 ± 0.3

5.1 ± 0.1

10.3 ± 0.1

Avanta 18h

5.1 ± 0.2

10.3 ± 0.3

5.1 ± 0.1

10.3 ± 0.1

Avanta 24h

5.1 ± 0.2

10.3 ± 0.3

5.1 ± 0.1

10.3 ± 0.1

Avanta 30h

5.1 ± 0.2

10.3 ± 0.3

5.1 ± 0.1

10.3 ± 0.1

Note

Only make small adjustments to the adjusting screw, maximum 1/8 turns when setting O2 /CO2

Note

Ensure that the analysing probe has a gas tight seal in the sampling point with the probe end in the centre of the flue duct.

page 29


  1. Checking/setting the gas/air ratio at part load

Tab.7 Checking/setting values part load CO2 and O2 (front panel not fitted)

Checking/setting values O2 /CO2 for natural gas (G20)

Boiler type

Checking

Setting

O2 (%)

CO2 (%)

O2 (%) CO2 (%)

Avanta 15h

5.2 0.2

8.8 ± 0.3

5.2 0.1

8.8 ± 0.1

Avanta 18h

5.2 0.22

8.8 ± 0.3

5.2 0.1

8.8 ± 0.1

Avanta 24h

5.2 0.2.2

8.8 ± 0.3

5.2 0.1 8.8 ± 0.1

Avanta 30h

5.2 0.2.2 8.8 ± 0.3 5.5.2 0.1

8.8 ± 0.1

Tab.8 Checking/setting values part load CO2 and O2 (front panel not fitted)

Checking/setting values O2 /CO2 for LPG (G31)
Boiler type Checking Setting
O2 (%) CO2 (%) O2 (%) CO2 (%)
Avanta 15h 5.1 ± 0.2 10.3 ± 0.3  5.1 0.1 10.3 0.1
Avanta 18h 5.1 ± 0.2 10.3 ± 0.3  5.1 0.1 10.3 0.1
Avanta 24h 5.1 ± 0.2 10.3 ± 0.3 5.1 0.1 10.3 0.1
Avanta 30h 5.1 ± 0.2 10.3 ± 0.3 5.1 0.1  10.3 0.1

Fig.39 Check the gas/air ratio control - set to part load - gas/air ratio adjustment B on gas block

Note

Only make small adjustments of the adjusting screw, maximum 1/8 turns when setting O2 /CO2

Note

Ensure that the analysing probe has a gas tight seal in the sampling point with the probe end in the centre of the flue duct.

Repeat the 'test at full load' and 'test at part load' as often as necessary until the correct values are achieved without further adjustments

page 30


  1. Preparing the boiler for use

Note

Following a manual override the boiler will return to normal operating mode if no keys are pressed for 15 minutes.

Fig.40 Preparing boiler for use

The boiler is now ready for operation.

Note

The boiler is delivered pre- tested and operating parameters set up with standard factory settings to suit the most common systems. These setting can be adjusted to suit specific site conditions but must not be changed without reference to Baxi or one of our approved contractors.

  1. Instructing the user

It is the responsibility of the installer as part of the commissioning procedure to instruct the user in the day to day operation of the boiler and controls fitted to the system and to hand over the completed Benchmark Checklist at the back of this manual.

Fig.41 Instructing the user

2.10.4 Normal start- up procedure

page 31


2.10.5 Error during the start- up procedure

 Note

After any error , , , or ; the 3 minute venting cycle will run first before starting the boiler.

2.10.6 Read out settings

The following settings can be read out in the 'user menu' :

Fig.42 Read out settings out settings

page 32


2.10.7 Adjust the boiler according to the system

The operating parameters of the boiler have been factory set to suit most systems. However it is possible to adjust some of the parameters to enable the boiler to operate more efficiently to match specific system designs and site conditions. These parameters are split into two specific sections:

  1. User level - Parameters to ; can be changed by the user to suit CH and DHW comfort conditions
  2. Service level - to ; must only be changed by Baxi approved Engineer after consultation with the system designer.

Note

How to change the parameters at user level can be read on the "Short reference card" provided and therefore will not be detailed in this Installation and Service manual.

2.10.8 Changing the parameters at service level (with access code)

To avoid non authorised adjustments, some parameter settings can only be changed once the special access code has been entered. This code may only be used by qualified installers.

The following settings can be changed at user and service level:

Tab.9 Settings at service level

Codes in display

Description

Setting range and notes where applicable

Factory settings
15h 18h 24h

30h

T flow set

20 - 85°C

75°C (1)

T DHW set

40 - 65°C

55°C

Boiler regulation

0 = CH off and DHW off
1 = CH on and DHW on
2 = CH on and DHW off
3 = CH off and DHW on

2

Eco or comfort setting

0 = comfort setting
1 = eco mode (2)
2 = regulated by controller

2

Anticipated current

0 = no anticipated current for thermostat on/off
1 = anticipated current for thermostat on/off

0

Display off automatically

0 = display stays off
1 = display stays on
2 = display light switches off automatically after 3 minutes

2

Maximum fan speed CH (natural gas)

Do not change (3)

30 (4) 35 (4) 45 (4)

52 (4)

Maximum fan speed CH (LPG)

Adjustments for LPG firing

28 (4) 33 (4) 43 (4)

50 (4)

Maximum fan speed DHW
(natural gas)

Do not change (3)

30 (4) 35 (4) 45 (4)

52 (4)

Maximum fan speed DHW
(LPG)

Adjustments for LPG firing

28 (4) 33 (4) 43 (4) 50 (4)

Minimum fan speed (CH and DHW)
(natural gas)

Do not change (3)

13

Minimum fan speed
(CH and DHW)
(LPG)

Adjustments for LPG firing

20 (1) 

Starting fan speed

Do not change

25 25 28

28

Pump setting CH

Do not change

0

Pump running time after CH

1 - 99 minutes

2

Connection with Heat Recovery Unit (HRU)

0 = no connection with HRU
1 = connection with HRU

0

page 33


Codes in display

Description

Setting range and notes where applicable

Factory settings

15h 18h  24h

 30h

State remote alarm
(X7 terminal)

0 = off (connectors 1 and 2 closed)
1 = alarm signal (connectors 1 and 2 closed)
2 = run indication (connectors 1 and 3 closed)
3 = ext. gas valve (connectors 1 and 3 closed)
4 = external pump relay (connectors 1 and 3 closed)

0

Legionella protection

0 = off
1 = on
2 = automatic
(after putting boiler into operation, it
will run for DHW operation 65°C once a week)

0

DHW cut- in temperature

2 - 15°C 5 (5)

Heat curve set point
flow temperature

0 - 60°C

 20

Heat curve set point
outside temperature (min)

0 - 30°C

20

Heat curve set point outside temperature
(max)

- 40 - 0°C

- 15 (6)

Boiler type

Do not change

3

Set point augmentation calorifier

0 - 20°C

15 (5)


(
is shown later)

Restore factory settings

On identification plate setting X is shown.
Change parameter into X will restore the factory settings,
see par. 2.10.10.

X

On identification plate setting Y is shown.
Change parameter into Y will restore the factory settings,
see par. 2.10.10.

Y

(1) Adjustable between 20 - 85°C but the highest water temperature setting for this type of boilers is limited to 75°C.
(2) The boiler in combination with an external calorifier will not warm up the calorifier in the Eco- mode.
(3) Only change for LPG firing.
(4) Do not exceed this value.
(5) Only in combination with a calorifier with a DHW sensor.
(6) "Minus" character is not shown in display. in display.

Warning

Changing the factory settings could result in the boiler not working properly.

The parameters can be changed from the stand- by status as follows:

Fig.43 Change parameters in service level

Note

The boiler will automatically return to the normal operating mode if no keys are pressed for 10 minutes.

page 34


2.10.9 Changing the maximum output (Hi) for CH operation

The maximum output for CH operation can be changed with parameter (maximum fan speed) and is set standard to a speed of 2400, 3000, 3500, 4500 or 5200 rpm for the five System- types. See the speed-input ratio figures.

This parameter can be changed from the stand- by status as follows:

Fig.44 Change boiler output

Fig.45 Fan speed / boiler input ratio Avanta 15h and 18h

Speed- input ratio

Fig.46 Fan speed / boiler input ratio Avanta 24h and 30h

Speed- input ratio

page 35


2.10.10 Restore factory settings

The factory settings can be restored in the service level as follows:

  1. After parameter has shown, press the [+]- key; and appear alternately;
  2. Press ; appears;
  3. Read boiler identification plate for value of ; press [+] or [-] key to reach this value;
  4. Press -to confirm; and appear alternately;
  5. Read boiler identification plate for value of ; press [+] or [-] key to reach this value;
  6. Press -to confirm; boiler restarts with original factory settings.

Fig.47 Restore factory settings

2.11 Putting the boiler out of operation

The boiler must be switched off and allowed to cool down before any maintenance or repairs are carried out. If the central heating system is not going to be used for a long time (during the holidays, for instance, or frost- free periods) it is advisable to put the boiler out of operation.

2.11.1 Boiler with frost protection, during longer periods of non- use

Now the boiler will only start working to protect itself against freezing. With external frost protection, the boiler can also prevent the central heating system from freezing.

2.11.2 Boiler without frost protection, during longer periods of non- use

Warning

Drain the boiler and central heating system if you will not be using the home for a long period and there is a chance of night frost.

page 36


3 Inspection and maintenance

The boiler is practically maintenance free but should be inspected annually.

Note

If during the annual inspection the flue gas analysis indicates that the values are outside the figures given in table 10, maintenance work should be carried out as described in par. 3.2. Also carry out maintenance if the ionisation read- out value is lower than 3 or higher than 9µA, or when the flame core is not correct.

Only Baxi spare parts/materials should be used.

All service and maintenance must be carried out by a qualified Engineer with the relevant training and certification (i.e. ACS - IEE registrations etc).

3.1 Inspection

The annual inspection of the boiler can be limited to the following checks:

Fig.48 Annual inspection

3.1.1 Checking the flue pipes and air supply pipes for leaks

Check that the flue and air- supply connections and pipes are sealed and the terminal exit is clear.

Fig.49 Checking flue pipes

page 37


3.1.2 Checking the condensate siphon

Check the condensate siphon. Remove any dirt residues and refill with clean water to the mark.

Fig.50 Checking the condensate siphon

3.1.3 Checking the ignition electrode

If the read- out value is lower than 3 or higher than 9µA, check cable and connections are sound if OK replace the ignition electrode.

Fig.51 Checking the ignition electrode

Note

The ignition cap is fixed on the ignition electrode and therefore cannot be removed.

3.1.4 Checking the combustion

Fig.52 Checking the combustion

Note

Ensure that the analysing probe has a gas tight seal in the sampling point with the probe end in the centre of the flue duct. flue duct.

page 38


Tab.10 Checking values O2 /CO2 (front panel not fitted)

Checking values O2 /CO2 for natural gas (G20)

Boilertype

O2 %

CO2 %

Avanta 15h

5.2 ± 0.2

8.8 ± 0.3

Avanta 18h

5.2 ± 0.2

8.8 ± 0.3

Avanta 24h

5.2 ± 0.2

8.8 ± 0.3

Avanta 30h

5.2 ± 0.2

8.8 ± 0.3

Tab.11 Checking values O2 /CO2 (front panel not fitted)

Checking values O2 /CO2 for LPG (G31)

Boilertype

O2 %

CO2 %

Avanta 15h

5.1 ± 0.2

10.3 ± 0.3

Avanta 18h

5.1 ± 0.2

10.3 ± 0.3

Avanta 24h

5.1 ± 0.2

10.3 ± 0.3

Avanta 30h

5.1 ± 0.2 0.2

10.3 ± 0.3

See The O2 /CO2 - values in table 10 and table 11 are checking values. For setting values see table 05 - table 08

If the flue gas analysis readings are within the values in table 09 the boiler combustion is correct. However, if the readings are outside the given values, then adjust the gas air ratio control to the given values, see table 05 - table 08 in par. 2.10.3.

If the adjustments cannot achieve the mentioned values, the boiler will require a full service please refer to the maintenance instructions in par. 3.2.

Check the flame via the inspection glass; in full load the flame should be stable with an even blue colour and in part load should be stable with an even orange colour.

Fig.53 Benchmark checklist

3.2 Maintenance

To conduct maintenance:

Note

Danger of electric shock

Isolate power supply at the fused spur before carrying out any work on the boiler.

page 39


  1. Open the boiler

Fig.54 Open the boiler

  1. Maintenance of the ignition/ionisation electrode

Fig.55 Maintenance the electrode

page 40


  1. Dismantling the front plate of the heat exchanger

Fig.56 Dismantling the front plate of the heat exchanger

  1. Maintenance to the burner

Fig.57 Checking the burner

  1. Maintenance to the heat exchanger (CH)

Fig.58 Maintenance to the heat exchanger

page 41


  1. Re-Assembling the boiler and checking the combustion

Note

Fig.59 Assembling the boiler

Note

Fill in the Benchmark Service Record on the inside back pages of this document, after conducting any maintenance.

page 42


4 Errors

4.1 General

The boiler has an advanced control unit. The heart of this control unit is a microprocessor, the abc®- control which both controls and protects the boiler. If an error is detected anywhere in the boiler, it will lock out and an error code will appear in the display.

4.2 Error codes

The boiler displays the error codes as follows:

(the display alternately shows an and a number e.g. ). The meaning of the various error codes can be found in the error table, see table 12.

How to deal with errors:

Note

The error code is important for the correct and swift detection of the nature of the error and for possible support from our technical help line 0844 871 1525.

Tab.12 Error codes

 

Error code

Description

Possible cause

Check / solution

Flow or return
sensor fault.

Short circuit in the flow, return or
boiler temperature sensor.

Check the wiring and the connections of the sensors visually:
are the plugs all correctly in position?
With a multimeter: measure the resistance in the wiring and connection.

Defective or not (properly) connected
flow, return or boiler temperature sensor.

Check that the sensors are working;
take the sensors out (1) and measure the resistance with a multimeter at room temperature (20 - 25°C);
the sensor is working properly if the resistance is between 12 and 15 kΩ.

Flow temperature
is higher than
the set maximum
temperature.

Insufficient water.

Check the water level and check for leaks.

No through flow.

Check that the pump is working;
turn the spindle with a screwdriver, if that works but the pump still does not respond,
check the wiring; if that is in order the pump is faulty.

Too much air in the system.

Vent the system.

Deviation in the flow or return
temperature sensor.

Check that the sensors are working; take the sensors out (1) and measure the resistance with a
multimeter at room temperature (20 - 25°C);
the sensor is working properly if the resistance is between 12 and 15 kΩ.

Return temperature
is higher than the
flow temperature.

Insufficient water.

Check the water level and check for leaks.

No through flow.

Check that the pump is working; turn the spindle with a screwdriver, if that works but the pump
still does not respond, check the wiring; that is in order the pump is faulty.

Too much air in the system.

Vent the system.

Sensors not wired correctly.

Check the wiring between sensors and control unit.

Pump operating in wrong direction.

Check wiring from and to control unit.

Flow and return connections crossed.

Flow and return connections.

Deviation in the flow or
return temperature sensor.

Check that the sensors are working; take the sensors out (1) and measure the resistance with a
multimeter at room temperature (20 - 25°C);
the sensor is working properly if the resistance is between 12 and 15 kΩ.

Control unit or earth fault.

Mains supply not correctly earthed. Control unit faulty.

Check that the power supply from the switch spur is properly earthed;
if that is the case the control unit is faulty.

page 43


Error code

Description

Possible cause

Check / solution

 

More than 5 start
attempts without any
 flame formation.

No ignition spark.

Check:

  • the connection between the ignition wire and the ignition trafo;
  • the ignition wire and electrode for 'dielectric breakdown' ;
  • the inter- electrode distance, this should be 3 - 4 mm;
    that weather the ignition electrode is properly earthed.

A spark but no flame.

Check that:

  • the gas tap is open;
  • the gas pre- pressure is sufficient;
  • the gas pipe is de- aerated;
  • the gas valve is energised during ignition and opens;
  • the electrode is correctly fitted and clean;
  • the CO2 adjustment at low and full load;
  • there is no obstruction / fitting fault in the gas pipe;
  • there is no obstruction in the air supply or flue (e.g. a blocked siphon);
    there is no recirculation of flue gasses (either inside or outside the boiler).

There is a flame but no, or insufficient ionisation
(lower than 3 or higher than 9 µA).

Check:

  • the flame, is the heart of the flame visible and the flame stable?
  • the CO2 adjustment at low and full load;
  • that the ignition electrode is correctly earthed;
    visual check of the ignition/ionisation electrode:
    look for white oxide film (remove with sandpaper or a screwdriver);
    look at the shape (are the pins still the original shape and is the distance between the two
    ends of the pins between 3 and 4 mm).

No ionisation or
ionisation failure
more than 5 times
during one heat demand.

CO2 wrongly adjusted.

Check:

  • CO2 adjustment on the gas block;
  • ignition/ionisation pin;
  • flue/air- supply connections; gas flow at full load;
    If there is no recirculation of flue gasses (either inside or outside the boiler).

Unwanted flame formation.

Ignition Unit.

Faulty ignition unit, replace ignition unit.

Control unit.

Faulty control unit, replace control unit.

No water in the boiler or
the pump is not working.

Insufficient water.

Check the water level and check for leaks.

No through flow.

Check that the pump is working; turn the spindle with a screwdriver,
if that works but the pump still does not respond, check the wiring;
that is in order the pump is faulty.

Too much air in the system.

Vent the system.

Pump operating in wrong direction.

Check wiring from and to control unit.

Pump not running.

Check wiring, connections and pump.

Fan fault.

Fan is not working.

Check:

  • fan function;
  • fan wiring and connection.

Fan does not stop.

Check:

  • fan function;
  • fan wiring and connection;
  • excess chimney draught.

No water in the boiler or the
pump is not working

Insufficient water in central heating system

Check the minimum water pressure, read off the gauge and check for leaks
 (ie. Expansion vessel)
Refill the central heating system
Bleed the central heating system

Reset boiler

Failure water pressure switch

Contact installer

No through flow during
venting cycle.

Insufficient water.

Check the water level and check for leaks.

Too much air in the system.

Vent the system.

No through flow.

  • Check that the pump is working;
    turn the spindle with a screwdriver, if that works but the pump still does not respond,
    check the wiring; if that is in order the pump is faulty;
  • Open the radiator valves.

page 44


Error code

Description

Possible cause

Check / solution

Air box temperature too
high.
Air leakage from heat exchanger to air box.

Check:

  • the sealing of the viewing glass;
  • whether front plate of heat exchanger is properly tightened
  • front plate sealing;
  • whether ignition electrode is properly fitted.

Heat- exchanger fuse
protection has responded;
replace the heat exchanger
after finding and solving
the cause.

Heat exchanger faulty.

Check wiring between heat exchanger fuse.

Insufficient water.

Check the water level and check for leaks.

No through flow.

Check that the pump is working; turn the spindle with a screwdriver,
if that works but the pump still does not respond, check the wiring; if that is in order the pump is faulty.

Parameter limits.

Automation settings.

Replace / settings, see par. 2.10.10.

If this error code still returns after resetting; please contact Baxi.

Parameter check.

Automation settings.

Replace / settings, see par. 2.10.10.
If this error code still returns after resetting; please contact Baxi.

Default parameters.

Automation settings.

Replace boiler control unit.

(1) When sensors have been taken out, be sure to replace them max. 40 mm underneath heat exchanger.

Note

If you read out a not listed error, please report to Baxi.

4.3 Control stop or lock- out

Fig.60 Sensor resistance graph

Note

Every 10 minutes the boiler will try to restart until the cause has been removed.

Note

The lock- out will disappear once the cause has been removed!

4.4 Error code memory

 The boiler control unit has an error code memory, in which the last 16 errors are stored. In addition to the error code ( and a number ).

To get access to the error memory, access code must be entered.

page 45


4.4.1 Error readouts

Fig.61 Error read outs

4.4.2 Deleting errors

The last message in the list, followed by will appear in the display;

Note

When tracing an error, the cause can often be found more quickly if the operating status at the time the error occurred can be retrieved from the error memory.

page 46


5 Service parts

5.1 General

If, following the annual inspection or maintenance any part of the boiler is found to need replacing, use Baxi spare parts only or spare parts and materials recommended by Baxi.

If any component is to be replaced and it is covered by the terms and condition as described in the warranty leaflet, return the faulty component to Baxi with the details as shown in table 13.

Tab.13 Return form example

page 47


Fig.62 Exploded view Baxi Avanta

page 48


Tab.14 Break down parts kit

Break down parts kit

Part No

Description

Position

S100006

Heat exchanger 15h, 18h

2001

S100014

Heat exchanger 24h, 30h

2001

S62741

Burner 15h, 18h

2003

S100017

Burner 24h, 30h

2003

S62743

Electrode ignition/ionisation

2004

S59118

Glass inspection set

2005

S100015

Siphon assembly

2021

S58733

Sensor temperature (2 pcs)

2023

S100011

Fan assembly

3001

S58685

Gas combination block

3005

S101057

Control board

4001

S59128

Display print board

4002

S100012

Transformer ignition

4003

S43561

Fuse glass 2 amp slow (10pcs)

4006

page 49


6 EC declaration

The device complies with the standard type described in the EG declaration of conformity. It was manufactured and commissioned in accordance with European directives.

The original of the declaration of conformity is available from the manufacturer.

page 50


7 Regulations

7.1 EC regulations

The boiler meets the requirements of the EC regulations at the following directives:
-90/396EEC Gas appliances directive
-92/42/EEC Efficiency directive
-2006/95/EEC Electrical low voltage directive
-2004/108/EEC EMC directive
-97/23/EEC Pressure equipment directive (art. 3, sub. 3)

Classification type for evacuation of the combustion products; according EN 483

7.2 Baxi factory test

Before it leaves the factory, each boiler is optimally adjusted and tested for:
-Electrical safety;
-CO2- adjustment;
-Hot water function;
-Water tightness;
-Gas tightness;
-Automation parameters.

7.3 Additional guidelines

In addition to the regulations and guidelines as mentioned in par. 7.1 the following guidelines in this documentation should also be observed.

It applies for all regulations and guidelines, mentioned in this Installation and Service manual, that any additions or new regulations and guidelines at the time of installation will also apply.

page 51


8 Technical specifications and working principle

8.1 Technical data

Tab.15 Summary of technical data

Appliance type Baxi Avanta

15h

18h

24h

30h

General

Gas council number 

-

41-075-95

41-075-96

41-075-97

41-075-98

Boiler control

 

modulating or on/off

Nominal output Pn (80/60C

(CH)

kW

15.0

17.6

23.5

29.4

Nominal output Pn (50/30C)

(CH)

kW

15.8

19.0

25.0

31.3

Nominal input Qn 

(Hi)

kW

5.8 - 15.3

5.8 - 18.0

6.1 - 25.2

6.1 - 30.0

Nominal input Qnw 

(Hi)

kW

15.3

18.0

25.2

30.0

Assembly dry weight 

kg

20

20

21.5

21.5

Noise level at distance of 1m from the boiler (at full load

dB(A)

< 44

Gas and flue details

Classification due to discharging flue gases 

-

C13,C33, C53

Gas type permitted

-

II2H3P  (natural gas and LPG)

Gas inlet pressure natural gas

mbar

20 - 25

Gas consumption natural gas 

(maximum)

mn3/h

1.6

1.8

2.7

3.2

Gas flue rate

kg/h

25.8

31.0

42.4

50.5

Gas inlet pressure LPG

mbar

37 - 50

Gas consumption LPG 

(maximum)

mn3/h

0.6

0.7

1.0

1.2

NO(x) Class (1)

-

5 (2)

NO(x) annual emission (n = 1)

ppm

< 30

mg/kWh

< 53

Residual fan duty (full load

Pa

35

40

50

100

CH side

Water capacity (heat exchanger and piping)

 

l

1.8

1.8

2.0

2.0

Minimum operating water pressure

 

bar

0

.1

Maximum operating water pressure PMS

 

bar

3

Water temperature 

(maximum)

°C

98

Operating temperature

(maximum)

°C

75

Water pressure lossT = 11°C

 

mbar

330

450

630

970

Electrical

Main supply

 

V/Hz

230 / 50

Power consumption

maximum

W

50

50

115

115

in stand- by status

W

< 3

Degree of protection

 

IP

X4D

(1) This data applies for natural gas.
(2) Measured according EN 483 (Class 5 complies with a limited concentration of NOx < 70 mg/kWh ).

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8.2 The boiler components

Fig.63 Components of the boiler

  1. Flue / Air inlet connection
  2. Flue gas measuring point
  3. Heat exchanger
  4. Front plate heat exchanger
  5. Siphon
  6. Control panel
  7. Fan
  8. Air inlet tube
  9. Gas valve multiblock / Ignition transformer
  10. Ignition/ionization electrode
  11. Control unit

8.3 Working principle

The boiler casing serves as a sealed air box, with air drawn in by the fan. On the outlet side of the fan is a venturi, into which a measured quantity of gas is injected based on the volume of air available. The fan speed control is dependent on the settings of the external control, the advanced boiler controller 'abc®' and the prevailing temperatures (measured by the temperature sensors).

This method of gas/air ratio control ensures that the gas quantity is precisely adjusted to the air quantity. Thus creating optimum combustion over the whole heat input range. The gas and air is mixed in the venturi and then passes into the specially designed pre- mix burner. After combustion, the hot flue gas is directed through a specially designed, high efficiency helicoil stainless steel heat exchanger with a large surface area, and transfers its heat to the system water circulating around the coils. In the condensing part of the exchanger the water vapour in the flue gas condense within it and the heat released during this process (the so- called latent or condensing heat) is also transferred to the system water. The condensate water so formed is discharged from the heat exchanger via a siphon.

Note

In normal operation, the boiler' s flue gas discharge will produce a visible white condensing "plume" and therefore care should be taken when choosing a location for the terminal.

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8.3.1 Regulating

The Baxi Avanta is a fully modulating boiler and can be regulated using one or more of the following methods:

  1. Open Therm - 2 wire interface compatible with the Baxi qSense room compensator and the Baxi iSense outside weather compensator or with any other proprietor' s OpenTherm® controls.
  2. Open Therm thermostat in combination with an external time clock.
  3. On/Off room thermostat - volt free (on the X9 terminal strip).
  4. On/Off room thermostat - 230 V (on the X2 terminal strip).
  5. 230 V Switching time clock - compatible with the Baxi two channel time clock or with any other appropriate time clock. For further details see par. 2.7.

8.3.2 Advanced boiler control ('abc®' - control)

An intelligent advanced boiler control ('abc®') continuously monitors the boiler conditions and ensures a very reliable supply of heat. This control system is adept at dealing with negative influences from the system such as flow reduction, airflow problems and alike. In the event of such influences, the boiler will not go to "lock- out" failure mode, but will in the first instance modulate back, and if necessary, depending on the nature of the circumstances, will temporarily switch off (shutdown or control stop), and then after a short while simply try again.

Note

Provided that the situation is not actually hazardous, the Baxi Avanta will always try to supply heat. The 'abc®' - control prevents unnecessary additional call outs.

8.3.3 Regulating the water temperature

The boiler is fitted with an electronic temperature regulator with flow and return temperature sensors. The flow temperature can be set to between 20 and 75°C, see par. 2.10.8 (factory setting 75°C). The boiler modulates it' s output up and down to match the flow set point from internal or external control. When the boiler is at it' s at minimum output and the flow temperature still continues to rise, once the flow set point is exceeded by 5°C the boiler will shut down on a controlled stop (code ).

8.3.4 Low flow / water protection

The boiler has a low- water protection based on temperature readings. By modulating down as soon as there is a risk of an insufficient water flow, the boiler will keep working for as long as possible. An insufficient water flow, however caused, - indicated by a flow/returnT > 22°C or a rate of rise in the flow temperature > 1°C/sec - will be sensed by the 'abc®' control which will shut the boiler down in a blocking mode with the display showing (code ) for 10 minutes and before re starting. If there is no water in the boiler or if the pump is not running, it will go to lock out (code ) and require manual re- set.

8.3.5 High Limit temperature protection

If the flow temperature exceeds 98°C the high limit temperature protection device switches off the boiler in a lock out mode with the display showing (code ). This mode will require a manual re-set. When the fault is corrected, the boiler can be restarted by pressing the [reset]- key on the control panel and holding for 3 seconds.

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9 Efficiency data and gas efficiency labels

9.1 Annual efficiency

108.7 % in relation to Hi at a load of 30% and a return temperature of 30°C.

9.2 Water- side efficiency

98 % in relation to Hi at full load and an average water temperature of 70°C (80/60°C).

94.3 % in relation to Hi at full load and an average water temperature of 40°C (50/30°C).

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© Copyright

All technical and technological information contained in these technical instructions, as well as any drawings and technical descriptions supplied, remain our property and shall not be multiplied without our prior consent in writing. Subject to alterations

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BAXI
A Trading Division of Baxi Heating UK Ltd (3879156)
Brooks House, Coventry Road, Warwick. CV34 4LL
After Sales Service 0844 871 1525
Technical Enquiries 0844 871 1555
Website www.baxi.co.uk

7604455 - v.02 - 11062013

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