remeha Avanta Plus Heat Only 12V, Avanta Plus Heat Only 18V, Avanta Plus Heat Only 24V User guide

Installation &
Service Manual

Remeha Avanta Range

12v I 18v I 24v

Remeha Avanta

Benchmark places responsibilities on both manufacturers and installers. The purpose is to ensure that customers are pro-

vided with the correct equipment for their needs, that it is installed, commissioned and serviced in accordance with the man-

ufacturer’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 accord-

ance with the Benchmark Code of Practice which is available from the Heating and Hotwater Industry Council who manage

and promote the Scheme.

Visit www.centralheating.co.uk for more information.

CONTENTS

INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

1 SAFETY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.1 General safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.2 Safety during assembly and installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.3 Safety during installation, inspection and maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2 INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2.1 Scope of delivery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2.2 Mounting the boiler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2.2.1 Installation / maintenance clearance requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2.2.2 Dimensions and connection points. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.2.3 Mounting the Remeha Avanta . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

2.3 Water-side connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

2.3.1 Water flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

2.3.2 System Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

2.3.3 Pressure loss of the boiler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

2.3.4 Open-Vented System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

2.3.5 Sealed systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

2.3.6 Additional guidelines for the domestic and CH water . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

2.3.7 Water treatment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

2.3.8 Safety valve discharge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

2.3.9 Draining Provision . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

2.3.10 Connecting the ‘CH return’ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

2.3.11 Connecting ‘CH flow’ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

2.3.12 Connecting condensate drain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

2.4 Gas-side connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

2.4.1 Additional guidelines for gas connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

2.4.2 Adjusting boiler to other gas-type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

2.4.3 Connecting the gas supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

2.5 Flue terminal and air supply connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

2.5.1 Flue terminal positions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

2.5.2 Room sealed flue . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

2.5.3 Connecting the flue terminal and air supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

2.6 Electrical connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

2.6.1 The control unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

2.7 Connecting external controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

2.7.1 Connecting an on/off control – room temperature (volt free switching) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

2.7.2 Connecting a time control using an external 230 V clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

2.7.3 Connecting a 230 V time clock in combination with a modulating room control . . . . . . . . . . . . . . . . . . . . . . . . 20

2.7.4 Connecting a modulating control – room or outside compensation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

2.7.5 Connecting an outside temperature sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

2.7.6 Connecting the DHW sensor/thermostat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

2.7.7 Connecting a three-way valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

2.7.8 Connecting a frost thermostat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

2.7.9 Connecting an external interlock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

2

2.7.10 Connecting remote alarm and boiler run indication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

2.7.11 Connecting a PC/PDA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

2.8 Connecting an external pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

2.9 Wiring diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

2.10 Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

2.10.1 Control Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

2.10.2 Additional guidelines for commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

2.10.3 Putting the boiler into operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

2.10.4 Normal start-up procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

2.10.5 Error during the start-up procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

2.10.6 Read out settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

2.10.7 Adjust the boiler according to the system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

2.10.8 Changing the parameters at service level (with access code) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

2.10.9 Changing the maximum output (Hi) for CH operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

2.10.10 Restore factory settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

2.11 Putting the boiler out of operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

2.11.1 Boiler with frost protection, during longer periods of non-use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

2.11.2 Boiler without frost protection, during longer periods of non-use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

3 INSPECTION AND MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

3.1 Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

3.1.1 Checking the flue pipes and air supply pipes for leaks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

3.1.2 Checking the condensate siphon . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

3.1.3 Checking the ignition electrode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

3.1.4 Checking the combustion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

3.2 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

4 ERRORS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

4.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

4.2 Error codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

4.3 Control stop or lock-out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

4.4 Error code memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

4.4.1 Error read outs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

4.4.2 Deleting errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

5 SERVICE PARTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

5.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

6 EC DECLARATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

7 REGULATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

7.1 EC regulations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

7.2 Remeha factory test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

7.3 Additional guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

8 TECHNICAL SPECIFICATIONS and working principle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

8.1 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

8.2 The boiler components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

8.3 Working principle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

8.3.1 Regulating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

8.3.2 Advanced boiler control (‘abc®’-control) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

8.3.3 Regulating the water temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

8.3.4 Low flow / water protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

8.3.5 High Limit temperature protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

. . . . . . . . . . . . . . . . . . 58

9 EFFICIENCY DATA AND GAS EFFICIENCY LABELS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

9.1 Annual efficiency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

9.2 Water-side efficiency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

3

INTRODUCTION

Remeha Avanta

The Remeha 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 Remeha Avanta boiler.



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.

fig. 01 Remeha Avanta

59970LTGBW7H046



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 Broag Ltd 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 0118 978 3434.



When contacting Broag 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.

4

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:

Tip  Useful tip or practical advice.
Indication  Important instruction in carrying out a

particular operation.

Warning  Possible danger of personal injury

or material damage to the regulator,
building or
environment.

Danger  Serious personal injury can occur

because of risk of electric shocks.

1.2 Safety during assembly and installation

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



Can you smell gas? What to do:

• do not smoke and do not create any flame or sparks;

• do not use any electric switches;

• turn off the gas tap;

• open windows and doors;

• trace possible leaks and seal them.
Warning! If the leak is before the gas meter, alert your gas
supplier, TRANSCO, tel. [phone].



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

• isolate power supply

• open windows and doors

• trace possible leaks and seal them.

1.3 Safety during installation, inspection and
maintenance

Under the Gas Safety (Installation & Use) Regulations 1998,
the Remeha 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.

5

Remeha Avanta

For any issues or circumstances not addressed within these
instructions, please call our After Sales Department 0118
9743070

Remeha Avanta 12v - PIN: 0063BQ3009
Remeha Avanta 18v - PIN: 0063BQ3009
Remeha Avanta 24v - PIN: 0063BQ3009
Gas Council numbers:
Remeha Avanta 12v: 41-288-09
Remeha Avanta 18v: 41-288-06
Remeha Avanta 24v: 41-288-10

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

Health and safety information

• The Avanta system is below the maximum lift weight for one
person, however please ensure all necessary care is taken
when lifting the boiler on to the wall mounting bracket.

• All sealants and gaskets are free from harmful products.
On first firing the boiler, a smell of these products may be
present and should cease after a short period.

6

2 INSTALLATION

fig. 02 Scope of delivery

59970.LT.GB.W7H.006

2.1 Scope of delivery

The standard delivery of the Remeha Avanta boiler includes:

- Boiler + mounting bracket

- Installation and Service manual, Quick reference card and
Mounting Template

- Warranty Leaflet (The terms and conditions of the warranty
are included in the warranty leaflet, on installation of the
boiler please fill in the registration card and return to Broag­Remeha)

- Wiring diagrams

- Gas cock with gasket + 90° gas pipe ( 22 mm)

- nylon plugs and screws for fixing mounting plate

- olives and nuts

- spacers

- cable glands;

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 Remeha Avanta 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.
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.
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”

7

min.1000

400

290

min.
250

600

min.
250

Remeha Avanta



Clearances shown are for ease of installation – once fitted it is
possible to enclose the boiler in a cupboard with 25mm 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.

fig. 03 Clearance requirements

132,5

290

60022679

49

147

59970LTGBW7H047

160

317

400

50

2.2.2 Dimensions and connection points.

 Return connection Ø 22 mm

40

 Flow connection Ø 22 mm
 Gas connection Ø 22 mm
 Combustion air inlet Ø 100 mm (concentric)
 Flue duct Ø 60 mm (concentric)
 Condensate drain connection ¾”

(standard overflow pipe size)



• Based on the guidelines and the required installation
space, determine where to mount the Remeha Avanta.

• In determining the boiler position, consider carefully the
flue outlet position and any pluming consequences.

85

206

88

94

40

fig. 04 Dimensions and connection points of the Remeha

Avanta

59970.LT.GB.W7H.001

8

ø8 mm

2.2.3 Mounting the Remeha Avanta

• Remove template from the box.

• Using the template determine and mark the position of the
mounting bracket and flue outlet.

• Drill the (Ø 8 mm) holes.

• Fit the (Ø 8 mm) plugs.

• Core drill the (Ø 125 mm) hole for the flue outlet

• Fit (Ø 6 mm) screws into the plugs.

• Remove boiler from the box and mount on bracket.

2x



• The boiler should be mounted on a suitable vertical wall

which is able to support the weight of the boiler.

• The boiler should be mounted in a room which, even

during severe cold weather, remains frost-free, or frost
protection controls MUST be fitted.

• If the boiler is to be installed in a timber framed building,

please refer to British Gas publication: ‘Guide for Gas
Installations in Timber frame Housing’, reference DM2.



• Make sure the boiler and any open connections are

protected from building etc. dust during the installation.

• There must be a 3 amp fused switched spur within 1 m of

the boiler.

• Provision must be made for the condensate discharge.

fig. 05 Mounting the Avanta

59970.LT.GB.W7H.002

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.

The minimum flow rate is 1.05 m

3

/h (0.29 l/s) at full load and

15°C differential across flow and return. To operate at dT =
11°C the flow rate must be 1.37 m

3

/h (0.38 l/s)

Higher resistance systems may require a higher duty pump.

The maximum power consumption of the pump may not
exceed 150 W /1.5 amps.
The connection of the pump is described in par. 2.8

9

Remeha Avanta

700

600

500

400

300

Pressure Loss [mbar]

200

100

0.5 0.6 0.7 0.8 0.9 1 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2

Pressure Loss Graph

Waterflow [m3/h]

Recommended T 11oC

Tmax.20

fig. 06 Pressure loss graph

Min. 450 mm

Feed and
exansion
cistern

o

C

59970.LT.GB.W7H.003

2.3.3 Pressure loss of the boiler

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.

2.3.5 Sealed systems

If the Avanta 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.

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).

Heating vent
Min. 22 mm

Static head
Min. 1 m

Max. 150 mm

fig. 07 Open-Vented system

Cold feed
Min.15mm

Flow

Return

59970.LT.GB.W7H.004



• The temperature of the central heating pipes and the

radiators can rise to 95°C.

• Use untreated tap water only to fill the CH system.

• The pH value of the system water must be between 6 and 9

• In case inhibitors are being used, please follow the

instructions given in, see par. 2.3.7.

10

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 Broag.

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:

• Metallic corrosion

• Formation of scale and sludge

• Microbiological contamination

• Chemical changes in the untreated system water



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.



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: or: Sentinal ‘X100®’ manufactured by:
Fernox, Cookson Electronics Sentinel Performance Solutions
Forsyth Road The Heath Business & Technical Park
Sheerwater Runcorn
Woking Cheshire,
Surrey GU21 5RZ WA7 4QX
Tel No: 01483 793200 Tel No: 0800 389 4670
Fax No: 01483 793201 Fax No: 0800 389 4677
Email: [e-mail] Email: [e-mail]
Web site: www.fernox.com Web site: www.sentinel-solutions.net

11

Remeha Avanta

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’

• Remove the dust cap from the ‘CH return’ connection 

at the top of the boiler.

• Fit the return pipe to 22 mm Ø compression fitting.

fig. 08 Connecting CH return

59970.LT.GB.W7H.005

2.3.11 Connecting ‘CH flow’

• Remove the dust cap from the ‘CH flow’ connection 

at the top of the boiler.

• Fit the flow pipe to the 22 mm Ø compression fitting.

fig. 09 Connecting CH flow

59970.LT.GB.W7H.007

12

fig. 10 Connecting condensate drain

59970.LT.GB.W7H.034

2.3.12 Connecting condensate drain

• Connect the condensate drain outlet  to a suitable waste

water drain point using acid resisting pipe work (i.e. - ¾”
overflow). To enable the siphon in the boiler to be removed
/ serviced, the connection should not be a permanent one
(i.e. “push fit” system or a “tundish” immediately below the
boiler).

• To prevent the risk of freezing connect the condensate into
an internal vertical soil pipe using a tundish (air break) c/w a
min 75 mm water seal trap.

• If the condensate pipe has to run externally make sure
this is done by realizing the shortest possible route, and
increase the diameter to at least 1¼” or insulate it with
weather resistant insulation.

• The drain should slope at least 3 cm per meter, with a maxi­mum horizontal length of 5 m.



• If connecting into an internal discharge branch (i.e. sink

waste etc) the connection must be down stream of the
existing waste trap.

• Fill the boiler siphon with water before operation, to prevent

flue gasses discharging into the room.

• The condensate drain must be connected in accordance

with current regulations.

2.4 Gas-side connections

2.4.1 Additional guidelines for gas connections



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 Avanta boiler is suitable for both natural gas and propane
firing. For propane 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 propane:
Fit restrictor (not included with boiler)
Adjust the fan speed (see par. 2.10.8) and
Adjust the gas/air ratio (see par. 2.10.3).

13

fig. 11 Connecting gas supply

59970.LT.GB.W7H.035

Remeha Avanta

2.4.3 Connecting the gas supply

• Before starting any work on the gas supply, turn off the main
isolation valve.

• Remove the dust cap from the gas connection  at the

bottom of the boiler.

• Connect the gas supply to the 22 mm Ø connection (copper
tail supplied).



• Make sure there is no dirt in the gas pipe.

• Make sure that there is sufficient gas pressure available

(at full load > 17 mbar).

• Preferably install a gas filter in the gas pipe to protect the

boiler.

• The gas supply must be connected, tested for soundness

and purged by a qualified Engineer and in accordance with
BS6891.

2.5 Flue terminal and air supply connections

The Remeha Avanta 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.



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.



The boiler will produce a water vapour plume during normal
operation Positions for the Remeha Avanta
figure and table 01. 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.

are shown in the

14

A

600 mm

S

G

F

P

H

2000 mm

S

B

C

A

G

fig. 12 Flue terminal positions

600 mm

D,E

J

No flue must penetrate
area within dotted lines
round roof light

M

L

J

K,N

LT.AL.W7H.000.020

Dimensions Terminal location Minimum distance (in mm)

to terminal (room sealed)

A Directly below an opening, air brick,

opening window, etc.

300

B Above an opening, air brick, opening window, etc. 300
C Horizontally to an opening, air brick,

opening window, etc.

300

D Below a gutter or sanitary pipe work 75
E Below the eaves 200

F Below a balcony or carport roof 200
G Above ground, roof or balcony level 300
H From vertical drain/soil pipe work 150

J From an internal or external corner 300
K From a surface or boundary facing the terminal 1500

L Vertically from a terminal on same wall 1500
M Horizontally from a terminal on same wall 300
N From a terminal facing the terminal 1200
P From an opening in a carport (e.g. door, window) into the building 1200
R From a vertical structure on the roof n/a
S Above an intersection with the roof 300

table 01 Minimum distances to terminal

15

L

80/125 or 60/100

Remeha Avanta

2.5.2 Room sealed flue

See table 02 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.

M&G material

Diameter in mm Ø 60/100 80/125

Maximum length ‘L’ allowed [m] 834

Eq. Length of 90° elbow

L

VRS roof
mounted
room sealed
terminal

2

59970.LT.GB.W7H.008 +

59970.LT.GB.W7H.009

ø125 mm

min. 275 mm

Eq. Length of 45° elbow

1

1.4

LT W6H 000 031

0.65

LT W6H 000 032

table 02 Maximum pipe lengths for fl ue duct and air supply in

room sealed application



For flue installations not covered by this booklet, please
contact our technical help line 0118 978 3434.

2.5.3 Connecting the flue terminal and air supply

• Check the depth of the wall and cut the terminal to suit
– taking note of the cutting instructions supplied with it

• Core drill a 125mm Ø hole in the wall, fit the rubber closure
plate at the exit end and slide the terminal through the wall
until the closure plate is clear of the outer edge of the wall
– pull back the terminal till the closure plate is flush then fit
inner wall closure to secure.

1

2

fig. 13 Connecting flue terminal and air supply



• All connections must be airtight and waterproof.

• Horizontal extension sections should slope towards the

boiler (at least 3 cm per metre).

59970LTGBW7H010

16

230 V

fig. 14 Electrical components with live 230 V

59970LTGBW7H011

2.6 Electrical connection

• Connect the boiler to the fused (3 amp) switch spur unit
adjacent to the boiler.

• The switch unit must always be accessible.



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

• electrical connection gas combination block;

• most parts of the control unit;

• ignition transformer;

• X1, X2, X4, X5, X6 and X7 terminal strip;

• 230 V supply cable connection.

2.6.1 The control unit

The Remeha Avanta 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.

fig. 15 The control unit

LTALW7H000023

The maximum rated input of the boiler is 150 W. The boiler is
fully pre-wired 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 03.

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

table 03 Control unit characteristics



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

17

Remeha Avanta

The output of the Remeha Avanta can be controlled in the fol­lowing ways:
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).
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).
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).

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).



• All connections on terminal X1, X2, X4, X5, X6 and X7 are
230 VAC.

• All connections on terminal X9 are low voltage only.

2.7 Connecting external controls

•

Release the two screws at the bottom of the front casing,
release plastic clip below display and remove the front casing.

• Remove one of the supplied grommets in the base of the
boiler, fit a cable gland and feed the cables through.

• Connect the cables to the relevant connectors, as shown in
the diagrams.



• Isolate power supply at the fused spur before carrying out

any work on the boiler controls.

fig. 16 Connecting external controls

59970LTGBW7H012

18

Exist
links

Exist
links

Terminal
Block X6

L
N

Terminal
Block X7

Terminal
Block X5

Terminal
Block X9

Terminal
Block X2

230v - 3 Amp
Power Supply

E

1

Common Alarm
(Closes on alarm)

2

3

Neutral

1

Open valve to DHW (230v)

2

Open valve to HTG (230v)

3

Outside sensor (red band) for direct boiler weather compensation

1

or when used in conjuction with a compatable Open Therm
control eg: Chronotherm or Celcia 20

2

3

DHW sensor (red band) or volt free thermostat (make on temp fall)
Remove existing link to use this function

4

5

External interlock (volt free)
Remove existing link to use function

6

Modulating - using Open Therm control

7

eg: Honeywell Chronotherm or Celcia 20
On / Off - using volt free switching control

8

eg: Celcia 10 or low volt room thermostat

54N

Power supply to external time clock -230v

L

Switch live (230v) from external time clock DHW demand

3

Remove existing link 4-3 to use this function

2

Switch live (230v) from external time clock HTG demand

1

Remove existing link 4-1 to use this function

NOTE: Terminal blocks are not in line as shown - diagramatic only

X2

X5

Boiler Run or
external pump relay
(Closes on run)

For external DHW priority
diverting valve on System boiler
when used in conjunction with
"Open Therm" compensation

X6

X7

X9

fig. 17 Boiler External Connection terminal details

Terminal
Block X9

1

2

Exist
links

3

4

5

6

7

Modulating - using Open Therm control
eg: Honeywell Chronotherm or Celcia 20
On / Off - using simple volt free switching control

8

X9

fig. 18 Wiring diagram on/off control

LT.AL.W7H.000.025

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

The Remeha Avanta can be connected to a 2-wire on/off ther­mostat, such as the Remeha Celcia 10.
Mount the thermostat in a reference room (usually the living
room).

• Remove existing link and connect the 2-wire 24 V room

thermostat to connectors 7 and 8 of the X9 terminal strip.



If a room thermostat with an anticipation resistor is being used,
parameter p5 should be changed from 0 to 1, see par.

2.10.8.

LT.AL.W7H.000.026

19

Remeha Avanta

2.7.2 Connecting a time control using an external 230 V
clock

X2

Terminal
Block X2

5

Power supply to external time clock -230v

4NL

Switch live (230v) from external time clock DHW demand

3
Exist
links

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

Remove existing link 4-3 to use this function

2

Switch live (230v) from external time clock HTG demand

1

Remove existing link 4-1 to use this function

LTALW7H000027



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

• A 230 V two channel time clock for CH and DHW control
can be connected to the Remeha Avanta

.

Live 230 V supply for the time clock - connect to connectors

4 (L) and 5 (N) on X2 terminal strip.

• For CH - remove exist link between connectors 4 and 1 of
the X2 terminal strip and connect the 230 V output from the
time clock to terminal 1 on the terminal strip X2.

• For DHW - remove exist link between connectors 4 and 3 of
the X2 terminal strip and connect the 230 V output from the
time clock to terminal 3 on the terminal strip X2.



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 Celcia 15
connected to connectors 7 and 8 of X9 terminal strip (remove
existing link), the Remeha Avanta will provide room compen­sated heating and time control over CH and DHW.



An OpenTherm

®

room modulating control (Celcia 15) used in
conjunction with a simple external 230 V time clock will provide
easy to set up and operate - timed room compensation heating

20