Baxi 105 HE - User Manual

© Baxi Heating UK Ltd 2011
Baxi Combi 105 HE
Gas Fired Wall Mounted
Condensing Boiler
Installation & Servicing Instructions
These instructions include the Benchmark Commissioning Checklist
and should be left with the user for safe keeping.

Summary

2.0 General Layout

2.1 Layout

Diagram and key identifying the main components of the boiler.

4.0 Technical Data

4.1 Combi 105 HE

Lists key technical specifications and performance data for the boiler model.

6.0 System Details

6.5 System Filling and Pressurising

Instructions on how to fill and pressurise the central heating system.

6.7 Pressure Relief Valve

6.8 Domestic Hot Water Circuit

7.0 Site Requirements

7.1 Location

Guidance on selecting a suitable location for boiler installation.

7.2 Clearances

Specifies required clearances around the boiler for installation and maintenance.

7.4 Gas Supply

Details the requirements for the gas supply installation.

7.5 Electrical Supply

Specifies the electrical supply requirements and connection methods.

7.6 Condensate Drain

Instructions for the correct installation of the condensate discharge pipework.

7.7 Flue

General guidelines and requirements for flue terminal positioning.

8.0 Flue Options

8.1 Horizontal Flue Systems

Details on the standard horizontal flue system and its limitations.

8.2 Twin & Vertical Flue Systems

Information on twin and vertical flue systems, including length calculations.

8.6 For Roof Terminals

8.7 Flue Dimensions

9.0 Plume Displacement

9.1 Plume Displacement Kit

Details the contents and purpose of the plume displacement kit.

9.2 Determining Permissible Lengths

Explains how to calculate permissible flue lengths using graphs and equivalencies.

9.3 General Fitting Notes

10.0 Installation

10.1 Initial Preparation

Steps for preparing the site and marking for installation.

10.4 Fitting The Boiler

Procedure for mounting the boiler onto the wall plate.

10.5 Fitting the Pressure Relief Discharge Pipe

Instructions for connecting the pressure relief discharge pipe.

10.6 Condensate Drain

Guidance on connecting the condensate drain pipe.

10.7 Fitting The Flue

Instructions for fitting the horizontal flue system.

10.8 Making The Electrical Connections

Detailed steps for making the main electrical connections.

10.9 Preliminary Electrical Checks

11.0 Commissioning the Boiler

11.1 Commissioning the Boiler

General steps for commissioning the boiler, including system checks.

11.2 Checking the Burner Pressure

Procedure for checking and adjusting the burner pressure.

12.0 Completion

12.1 Completion

Final steps, including user handover and completing documentation.

13.0 Servicing the Boiler

13.1 Annual Servicing

Instructions for performing annual servicing on the boiler.

14.0 Changing Components

14.1 Fan

Procedure for removing and replacing the boiler fan.

14.2 Pressure Switch

14.3 Heat Exchanger

14.4 Burner

14.6 Electrodes

14.8 Gas Valve

Procedure for removing and replacing the gas valve.

14.12 Pump - Head Only

14.13 Pump - Complete

14.16 Expansion Vessel

14.17 Condensate Trap

14.18 Pressure Relief Valve

14.19 P.C.B.

Instructions for replacing the Printed Circuit Board (PCB).

14.21 Plate Heat Exchanger

14.22 Diverter Valve Assembly

14.24 Secondary Heat Exchanger

14.25 Flue Overheat Thermostat

15.0 Illustrated Wiring Diagram

16.0 Fault Finding

Section A

Section B

Section C

Section D

Section E

Section F

Troubleshooting steps for issues related to gas supply and burner operation.

Section G

Troubleshooting steps for burner pressure and gas valve voltage issues.

Section H

Section I

Section K

Section M

GAS BOILER SYSTEM COMMISSIONING CHECKLIST

Baxi 105 HE Specifications

General

Model	Baxi 105 HE
Category	Boiler
Mounting	Wall-mounted
Fuel Type	Natural Gas
ErP Heating	A
ErP Water	A
Flow Rate (l/min)	12 l/min
Dimensions	780 x 450 x 345 mm
Operating Pressure	3 bar
CH Output (kW)	24.8