Baxi Potterton Gold FSB 30 HE Boiler User Manual

You can rely on
Installation & Service Instructions
Gold
FSB 30 HE
Floor Standing
Condensing Boiler
These instructions include the Benchmark Commissioning Checklist
and should be left with the user for safe keeping.
© Baxi Heating UK Ltd 2011
Natural Gas
Potterton Gold FSB 30 HE
G.C. No. 41 592 32
Building Regulations and the Benchmark Commissioning
Checklist
Building Regulations (England & Wales) require notification of
the installation of a heating appliance to the relevant Local
Authority Building Control Department. From 1 April 2005 this
can be achieved via a Competent Persons Self Certification
Scheme as an option to notifying the Local Authority directly.
Similar arrangements will follow for Scotland and will apply in
Northern Ireland from 1 January 2006.
The Health & Safety Executive operates the ‘Gas Safe Register’,
a self-certification scheme for gas heating appliances.
These arrangements represent a change from the situation
whereby compliance with Building Regulations was accepted as
being demonstrated by completion of the Benchmark Logbook
(which was then left on site with the customer).
With the introduction of Self Certification Schemes, the
Benchmark Logbook is being withdrawn. However, a similar
document in the form of a commissioning checklist and service
interval record is incorporated at the back of these instructions.
The Benchmark Scheme
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 Hotwater Industry Council who manage and promote the Scheme.
Visit www.centralheating.co.uk for more information.
© Baxi Heating UK Ltd 2011 All rights reserved. No part of this publication may
be reproduced or transmitted in any form or by any means, or stored in any
retrieval system of any nature (including in any database), in each case whether
electronic, mechanical, recording or otherwise, without the prior written
permission of the copyright owner, except for permitted fair dealing under
Copyrights, Designs and Patents Act 1988.
This company is a member of the Benchmark initiative and fully
supports the aims of the programme. Its aim is to improve the
standards of installation and commissioning of central heating
systems in the UK and to encourage the regular servicing of all
central heating systems to ensure safety and efficiency.
Building Regulations require that installations should comply
with manufacturer's instructions. It is therefore important that
the commissioning checklist is completed by the installer. The
relevant section of Building Regulations only relates to
dwellings. Therefore the checklist only applies if the appliance is
being installed in a dwelling or some related structure.
The flowchart opposite gives guidance for installers on the
process necessary to ensure compliance with Building
Regulations.
Applications for the copyright owner’s permission to reproduce or make other
use of any part of this publication should be made, giving details of the proposed
use, to the following address:
The Company Secretary, Baxi Heating UK Limited,
Brooks House, Coventry Road, Warwick. CV34 4LL
Full acknowledgement of author and source must be given.
WARNING: Any person who does any unauthorised act in relation to a
copyright work may be liable to criminal prosecution and civil claims for damages.
0086
ISO 9001
FM 00866
2
© Baxi Heating UK Ltd 2011
Installer Notification Guidelines
Choose Building
Regulations Notification
Route
Competent Person's
Self Certification Scheme
Building Control
Install and Commission this
appliance to manufacturer's
instructions
Contact your relevant Local
Authority Building Control
(LABC) who will arrange
an inspection or contact
a government approved
inspector
Complete the
Benchmark Checklist
If you notify via the ‘Gas Safe
Register’, the register will issue
the Building Regulations
certificate on members’ behalf
Install and Commission this
appliance to manufacturer's
instructions
Scheme Members only
Call ‘Gas Safe Register’ on:
0800 408 5577
or log onto:
www.gassaferegister.co.uk
within 10 days
Complete the
Benchmark Checklist
You must ensure that the
certificate number issued by
the ‘Gas Safe Register’ is written
onto the Benchmark Checklist
‘Gas Safe Register’ will issue a
Building Regulations Compliance
Certificate to the property owner
and inform the relevant LABC
© Baxi Heating UK Ltd 2011
LABC will record the data
and will issue a
certificate of compliance
3
Legislation
IMPORTANT - Installation, Commissioning, Service & Repair
This appliance must be installed in accordance with the manufacturer’s instructions and
the regulations in force. Read the instructions fully before installing or using the
appliance.
In GB, this must be carried out by a competent person as stated in the Gas Safety
(Installation & Use) Regulations.
Definition of competence: A person who works for a Gas Safe registered company
and holding current certificates in the relevant ACS modules, is deemed competent.
In IE, this must be carried out by a competent person as stated in I.S. 813 “Domestic
Gas Installations”.
The addition of anything that may interfere with the normal operation of the appliance
without express written permission from the manufacturer or his agent could invalidate
the appliance warranty. In GB this could also infringe the Gas Safety (Installation and
Use) Regulations.
Warning - Check the information on the data plate is compatible with local supply
conditions.
All Gas Safe registered engineers carry an ID card with their licence number and a
photograph. You can check your engineer is registered by telephoning
0800 408 5500 or online at www.gassaferegister.co.uk
The boiler meets the requirements of Statutory Instrument “ The Boiler (Efficiency)
Regulations 1993 No 3083” and is deemed to meet the requirements of Directive
92/42/EEC on the energy efficiency requirements for new hot water boilers fired with
liquid or gaseous fuels:Type test for purpose of Regulation 5 certified by:
Notified Body 0087.
Product/Production certified by:
Notified Body 0086.
For GB/IE only.
This company declare that no substances harmful to
health are contained in the appliance or used during
appliance manufacture.
The appliance is suitable only for installation in GB and IE
and should be installed in accordance with the rules in
force, and only used in a suitably ventilated location.
In GB, the installation must be carried out by a Gas Safe
Registered Installer. It must be carried out in accordance
with the relevant requirements of the:
• Gas Safety (Installation & Use) Regulations.
• The appropriate Building Regulations either The Building
Regulations, The Building Regulations (Scotland), Building
Regulations (Northern Ireland).
• The Water Fittings Regulations or Water Byelaws in
Scotland.
• The Current I.E.E. Wiring Regulations.
Where no specific instructions are given, reference should
be made to the relevant British Standard Code of Practice.
In IE, the installation must be carried out by a competent
Person and installed in accordance with the current edition
of I.S. 813 ‘Domestic Gas Installations’, the current Building
Regulations and reference should be made to the current
ETCI rules for electrical installation.
All systems must be thoroughly flushed and treated
with inhibitor (see section 6.2).
Codes of Practice, most recent version should be used
In GB the following Codes of Practice apply:
Standard
Scope
BS 6891
Gas Installation.
BS 5482 Part 1
Butane & Propane Gas Installation
BS 5546
Installation of hot water supplies for domestic
purposes.
BS EN 12828
Heating systems in buildings.
BS EN 12831
Heating systems in buildings - Calculation of load.
BS EN 14336
Installation & commissioning of water based
heating systems.
BS 6798
Installation of gas fired hot water boilers.
BS 5440 Part 1
Flues.
BS 5440 Part 2
Ventilation.
BS 7074
Expansion vessels and ancillary equipment for
sealed water systems.
BS 7593
Treatment of water in domestic hot water
central heating systems.
In IE the following Codes of Practice apply:
Standard
Scope
I.S. 813
Domestic Gas Installations.
The following standards give valuable additional information;
BS 5546
Installation of hot water supplies for domestic
purposes.
BS EN 12828
Heating systems in buildings.
BS EN 12831
Heating systems in buildings - Calculation of load.
BS EN 14336
Installation & commissioning of water based
heating systems.
BS 7074
Expansion vessels and ancillary equipment for
sealed water systems.
BS 7593
Treatment of water in domestic hot water
central heating systems.
4
© Baxi Heating UK Ltd 2011
Contents
Section
© Baxi Heating UK Ltd 2011
Page
1.0
Introduction
6
2.0
General Layout
7
3.0
Boiler Operation
8
4.0
Technical Data
9
5.0
Dimensions and Fixings
10
6.0
System Details
11
7.0
Site Requirements
15
8.0
Flue Options
20
9.0
Plume Displacement
25
10.0
Installation
29
11.0
Electrical
34
12.0
Commissioning the Boiler
36
13.0
Completion
38
14.0
Servicing the Boiler
39
15.0
Changing Components
42
16.0
Short Parts List
49
17.0
Fault Finding
50
Benchmark Checklist
58
5
Facia Securing Screws
1.0 Introduction
1.1
Description
Optional Integral Timer
1. The Potterton Gold FSB 30 HE is a gas fired room
sealed fan assisted condensing central heating boiler.
2. The maximum output of the boiler is 30.18 kW (Non Condensing) 32.61 kW (Condensing).
Position of Label
3. The boiler is designed for use on Natural Gas (G20)
only.
4. The boiler is suitable for fully pumped open vented and
sealed systems, providing heating and hot water.
5. A label giving details of the model, serial number and
Gas Council number is situated on the rear of the drop
down facia panel (Fig. 1).
6. The boiler data badge is positioned on the air box door
(Fig. 2).
Fig. 1
7. The boiler is intended to be installed in residential /
commercial / light industrial E.M.C. environments on a
governed meter supply only.
8. The boiler must be installed with one of the purpose
designed flues such as the standard horizontal flue kit, part
no 236921.
Case Securing Screws
1.2
Important Information
Man-made mineral fibre
• Some component parts of this boiler (insulation pads,
gaskets and rope seals) are manufactured from man-made
mineral fibre.
• Prolonged or excessive exposure to this material may
result in some irritation to the eyes, skin or respiratory
tract.
• It is advisable to wear gloves when handling these items.
• Irritant dust will only be released from the items if they
are broken up or subjected to severe abrasion. In these
instances a suitable dust mask and goggles should be
worn.
• Always thoroughly wash hands after installation,
servicing or changing components.
• When disposing of any items manufactured from manmade mineral fibre care must be exercised.
• If any irritation of the eyes or severe irritation of the skin
is experienced seek medical attention.
Air Box Door
Fig. 2
Data Badge
6
© Baxi Heating UK Ltd 2011
2.0 General Layout
2.1
16
Fig. 5
2
15
14
17
18
13
3
12
9
19
4
6
1.
Condensate Pump
2.
Flue Elbow (supplied in std. flue kit)
3.
Heat Exchanger
4.
Burner
5.
Air Box
6.
Fan Protection Thermostat - Black
7.
Fan Assembly
8.
Condensate Trap
9.
PCB Housing Assembly
10.
Gas Tap
11.
Gas / Air Ratio Valve
12.
Flow Pipe Connection
13.
Return Pipe Connection
14.
Flow Temperature Safety Thermostat - Black
15.
Flow Temperature Thermistor - Red
16.
Flow Switch (dry fire protection)
17.
Position of Optional Integral Timer Wiring
18.
Pipe Access Panel
19.
Manual Air Vent
2.2
5
Layout (Figs. 3, 4, 5 & 6)
110Ø Concentric Flues & Optional Extras
KIT
PART No
Standard Flue Kit 850mm (inc. elbow)
236921
Extended Flue Kit - 1.75M ( inc. elbow)
5111457
Flue Plume Deflector Kit
248167
Terminal Guard (suitable for use with above)
248484
FLUE EXTENSION KITS (110/70)
Flue Extension 250mm
241692
Flue Extension 500mm
241694
Flue Extension 1000mm (Use two kits for 2M etc.)
241695
Flue Bend x 2 - 45° (Reduce overall length of flue
by 0.5m when fitting this bend)
Fig. 3
241689
Flue Bend - 93° (Reduce overall length of flue
by 1m when fitting each bend)
7
241687
VERTICAL FLUE
1
Vertical Flue Terminal
242802
Vertical Flue Adaptor
5106888
See Section 7.12 for more flue option details
8
Integral Twin Channel Timer
5117696
11
Fig. 4
© Baxi Heating UK Ltd 2011
Fig. 6
10
7
3.0 Boiler Operation
3.1
Mains On.
Condensate Pump will
operate as necessary (3.1.9)
Flow
temperature less
than set point ?
3. Fan Pre-Purge: The flow switch is made and the fan
is on while the spark generator and gas valve are off.
After 5 seconds ignition occurs.
System Pump
Running and Flow
switch made ?
YES
5 second
Fan Pre-Purge.
YES
Ignition done
and less than 5
attempts made ?
Flame Detected ?
Ignition done and
5 attempts made ?
All TRVs
shut or Flow temperature
greater than set point ?
5 second
Fan Post Purge.
YES
All TRVs
shut down ?
3 minute
Anti-cycle.
8
© Baxi Heating UK Ltd 2011
6. Fan Post Purge: The fan is on while the spark
generator and gas valve are off. After 5 seconds if the
TRVs are shut down then anti-cycle occurs.
7. Anti-cycle: The fan, spark generator and gas valve
are off.
YES
Burner On.
4. Ignition: The flow switch is made, fan, spark
generator and gas valve are on. If a flame is detected
then burner on occurs. If a flame is not detected within
5 seconds and less than 5 ignition attempts have been
made then fan purge occurs. If a flame is not detected
within 5 seconds and 5 ignition attempts have been
made then ignition lockout occurs.
5. Burner On: The flow switch is made, fan and gas
valve are on while the spark generator is off. Flow
temperature is controlled by varying the fan speed (and
thereby the gas rate) to achieve optimum operation. If
the flow temperature is greater than the set point or
the TRVs all shut down then fan post purge occurs.
5 second
Ignition Period.
YES
1. Switched Live On: When switched live is supplied to
the boiler and the flow temperature is less than the set
point the sequence below commences.
2. Flow Switch: After 10 seconds if the flow switch has
made then fan pre-purge occurs. After 10 seconds if
the flow switch has not made then anti-cycle occurs.
YES
NO
Boiler Operation
YES
Ignition
Lockout.
8. Ignition Lockout: The fan, spark generator and gas
valve are off. The boiler can only be reset by manually
using the reset button.
9. Condensate Pump: Condensate accumulates in a
reservoir within the pump assembly. The pump may
run at any time, independent of boiler operation, to
discharge the condensate to drain.
4.0 Technical Data
C13
Appliance Category
Heat Input (Q)(Gross)
kW
C33
CAT I 2H
Max
Min
33.76
10.3
Heat Output (P)
(Non Condensing 70° C Mean Water Temp)
Max
Min
kW
30.18
9.2
Heat Output (P)
(Condensing 40° C Mean Water Temp)
Max
Min
kW
32.61
10.0
Max Gas Rate (2H - G20 - 20mbar)
(After 10 Mins)
kW Input
33.76
m3/hr
3.4
Inlet Pressure at Gas Valve (Natural Gas)
Min
18.1 mbar
Max
22.5 mbar
(see Section 10.1)
Injector (Natural Gas)
Diameter
6.5mm
CO/CO Ratio
0.004
NOx Class
5
2
Horizontal
Flue Terminal
Dimensions
Diameter Projection -
Connections
Gas Supply
Central Heating Flow
Central Heating Return
Condensate Drain (Pump)
Outercase Dimensions
Casing Height
Casing Width
Casing Depth
-
-
110mm
150mm
Electrical Supply
230V~ 50Hz
The boiler must be connected to an earthed
supply. A permanent and switched live are
required. The boiler has a 4 wire connection.
15mm
28mm
28mm
10mm o.d.
850mm
390mm
520mm
(For unventilated compartments see Section 7.2)
Weights
Packaged Boiler Carton
Packaged Flue Kit
Installation Lift Weight
Installed Weight (dry)
Recommended System
Temperature Drop
Condensing
-
5mm
15mm
-
25mm
500mm
5mm
-
kg
49.5
3.6
37.5
44.5
80W
External Fuse Rating
3A
Internal Fuse Rating (BS 4265)
Fuse
3.15 AT (PCB)
Minimum Clearances
Both Sides
Above Casing
Above Casing
Under fixed worktop (It is recommended that any
worktop is removable)
Front (For Servicing)
Front (In Operation)
Power Consumption
Electrical Protection
IPXX
Water Content
litres
2.6
Static Head
max
min
Low Head
0.2m min
System Detail
Fully pumped open vented & sealed systems.
No bypass required.
Controls
boiler thermostat, safety thermostat,
flow switch, electronic flame sensing,
temperature protection thermostat &
condensate blockage and level sensors
Boiler Flow Temperature (adjustable)
55° C to 78° C (± 5° C)
20°C
Condensate Pump
Head
Flow Rate
Connection
Assessment Procedure (SAP) for energy rating of
dwellings. The test data from which it has been
calculated has been certified by 0087.
Pressure Drop (mbar)
This value is used in the UK Government’s Standard
3 metres
1.8 l/min
10mm o.d. (pipe supplied)
Boiler Hydraulic Resistance Chart
SEDBUK Declaration
SAP 2005 Seasonal Efficiency
model is 90.9%
30 metres
1 metre
91
83
75
66
58
50
42
33
25
17
8
220
200
180
160
140
120
100
80
60
40
20
0
10
20
30
Pressure Drop (in wg)
Appliance Type
40
Water Flow Rate (litres/min)
© Baxi Heating UK Ltd 2011
9
5.0 Dimensions and Fixings
DIMENSIONS
At least
1.5°
A 850mm
B 520mm
C 390mm
A
D 125mm Ø Min.
E 175mm
F 150mm
B
C
D
Flue Ø 110mm
Fig. 7
The 1.5° fall provided by the elbow
is to allow condensate to run back to
the boiler, for discharge through the
condensate disposal system.
F
E
Y
X
At least
1.5°
Fig. 8
10
© Baxi Heating UK Ltd 2011
SIDE FLUE (left and right)
For every 1m of horizontal flue
length, the clearance above the top
of the flue elbow should be 27.5mm
to incorporate the 1.5° fall in the flue
from the terminal to the elbow. It is
especially important to consider
this when fitting the boiler under a
work top !
Flue length (Y)
Clearance (X)
up to 1m
27.5mm
1m - 2m
55mm
2m - 3m
82.5mm
3m - 4m
110mm
6.0 System Details
6.1
Water Circulating Systems
1. The boiler is suitable for use with open vent fully
pumped systems and sealed systems .
The following conditions should be observed on all
systems:
• The static head must not exceed 30m of water.
• The boiler must not be used with a direct cylinder.
• Drain cocks should be fitted to all system low points.
• All gas and water pipes and electrical wiring must be
installed in a way which would not restrict the servicing
of the boiler.
• Position isolating valves as close to circulating pump as
possible.
6.2
Treatment of Water Circulating
Systems
1. All recirculatory water systems will be subject to
corrosion unless they are flushed and an appropriate
water treatment is applied. To prevent this, follow the
guidelines given in BS 7593 “Treatment of Water in
Domestic Hot Water Central Heating Systems” and the
treatment manufacturers instructions.
2. Treatment must involve the use of a proprietary
cleanser, such as Sentinel X300 or X400, or Fernox F3
and an inhibitor such as Sentinel X100 or Fernox MB-1.
3. Full instructions are supplied with the products, for
further information contact Sentinel (0800 389 4670) or
Fernox (0870 870 0362).
Failure to flush and add inhibitor to the system will
invalidate the appliance warranty.
4. It is important to check the inhibitor concentration after
installation, system modification and at every service in
accordance with the inhibitor manufacturer’s instructions.
(Test kits are available from inhibitor stockists.)
5. For information or advice regarding any of the above
contact Technical Enquiries 0844 871 1555.
© Baxi Heating UK Ltd 2011
11
Boiler Air
Vent
6.0 System Details
Copper
0.5m
Copper
0.5m
Flow
Boiler
6.3
Return
Copper
1m
1. The sizes of flow and return pipes from the boiler
should be determined by normal methods, according to
the requirements of the system.
Fig. 9
m
00m
5
45°
1000mm
Min
Boiler Air
Vent
2. The connection tails for the boiler are 28mm diameter.
The 28mm section of the tails can be cut back to 22mm if
required.
22mm
Open Vent
3. The flow & return tails are push - fit ‘O’ ring
and clip connections within the boiler case.
15mm
Cold
Feed
400mm
Min Head
4. A 20 °C drop in temperature across the system is
recommended for condensing boilers. Existing radiators
may be oversized and so allow this, but where radiator
sizing is marginal it may be advisable to retain a system
temperature drop of 11°C.
150mm
Max
Boiler
Pump
5. In systems using non-metallic pipework it is necessary
to use copper pipe for the boiler Flow and Return. The
copper must extend at least 1 metre from the boiler and
include any branches (Fig. 9).
Flow
Return
Typical Low Head Installation
Fig. 10
mm
6. This boiler does not require a bypass.
6.4
22mm
Open Vent
500
15mm
Cold
Feed
1000mm
Min
Boiler
400mm
Min Head
a) The pump being adjusted to give a 20°C drop across
the boiler.
b) The pump must be fitted on the flow.
c) The pump must be fitted in accordance with the
pump manufacturer's instructions.
d) The open vent pipe must be taken up from a tee in a
horizontal section of the flow pipe.
150mm
Max
Pump
Flow
Return
If Conditions Require,
This System Possible
Fig. 11
2. For heads below 400mm then an alternative utilising a
combined vent and feed pipe may be connected (Fig. 12).
This must be a minimum of 22mm diameter. It is
recommended that an air separator is fitted when using a
combined feed and vent pipe.
6.5
200mm
Min
Boiler Air
Vent
1. A manual air vent is fitted on the flow pipe, to enable
complete venting of the boiler. The pipe access panel
must be removed to do this.
Air
Separator
Pump
Flow
Return
Fig. 12
12
© Baxi Heating UK Ltd 2011
Air Vents
For correct operation of the flow switch the boiler
and system MUST be completely vented.
22mm
Feed & Vent
Pipe
Boiler
Low Head Installation
1. Using a close couple arrangement the minimum head is
as shown in the diagrams (Figs. 10 & 11) subject to the
following conditions:
45°
Boiler Air
Vent
Pipework
Alternative Low Head Installation
2. Additional vents should be fitted at suitable points on
the system as required.
Key to colours
b
br
w
o
gr
g/y
-
Blue
Brown
White
Orange
Grey
Green/Yellow
6.0 System Details
6.6
This boiler requires a permanent live for
operation of the condensate pump and frost
protection.
230V
50Hz
L N E
w
Cylinder
Stat
gr
1
Room
Stat
1. To comply with Part L1 of the Building Regulations the
heating system into which the boiler is installed should
include the following:
Y Plan
Diverter
Valve
b
g/y
a) zone controls
b) timing controls
c) boiler control interlocks
o
C 2
S/L E
N P/L
System Control
Wiring Centre
Boiler Connection
(4 Core Wire)
Timer
L
N
CH on
HW on
HW off
2. Such a system needs to be fully pumped and must
provide independent temperature and time control to
both the heating and hot water circuits and have a boiler
and system pump interlock.
3. The boiler should be controlled so that it operates on
demand only. Where it is proposed to effect control by
thermostatic radiator valves a room thermostat should
also be provided to switch off the boiler when there is
no demand for heating.
NE L
Pump
Y Plan, Room Thermostat System, CH Interlocked By Room Thermostat,
DHW Interlocked By Cylinder Thermostat
At least the Radiator(s) near the Room Thermostat not TRV’d
Pump run from Switched Live
230V
50Hz
System Controls & Wiring
gr
b
gr
L N E
Motor
b
Motor
br
br
g/y
S Plan
Valve
Room Cylinder
Stat
Stat
o
g/y
S Plan
Valve
o
S/L E
System Control
Wiring Centre
N P/L
Boiler Connection
(4 Core Wire)
Timer
L
N
CH on
HW on
NE L
Pump
S Plan, Room Thermostat System, CH Interlocked By Room Thermostat,
DHW Interlocked By Cylinder Thermostat
At least the Radiator(s) near the Room Thermostat not TRV’d
Pump run from Switched Live
© Baxi Heating UK Ltd 2011
13
6.0 System Details
3 Litre
Top Up Bottle
(if required)
Air
Vent
Safety
Valve
Filling
Point
Pressure
Gauge
Pump
Radiator
Circuit
Expansion
Vessel
System Drains at
Low Point
Max Boiler Flow
Temp = 82° C
Method of determining minimum expansion
vessel volume for sealed systems.
Vessel Charge
Pressure (Bar)
Initial System
Pressure (Bar)
Multiply Total
Water Content Of
System By (Litres)
0.5
0.5
1.0
1.5
2.0
0.067
0.112
0.207
0.441
1.0
1.5
2.0
0.087
0.152
0.330
1.5
2.0
0.125
0.265
1.0
1.5
Example :- System Volume = 75 litres
Vessel Charge Pressure = 1.0 bar
Initial System Pressure = 1.5 bar
Then :- 75 x 0.152 = 11.4 litres
Expansion Vessel Volume
Table. 1
Sealed Systems (Fig. 13)
1. SAFETY VALVE - A safety valve complying with the
requirements of BS 6750 Part 1 must be fitted close to
the boiler on the flow pipe by means of a horizontal or
vertically upward connection with no intervening valve
or restrictions and should be positioned to facilitate
testing. The valve should be pre-set and non-adjustable
to operate at a pressure of 3 bar (45 Ibf/in2). It must be
arranged to discharge any water or steam through a pipe
to a safe outlet position.
2. PRESSURE GAUGE - A pressure gauge of minimum
range 0-4 bar (0-60 Ibf/in2) with a fill pressure indicator
must be fitted to the system, preferably at the same
point as the expansion vessel in an easily visible position.
Boiler
Fig. 13
6.7
NOTE
Where a vessel of the calculated size is not obtainable then
the next available larger size should be used.
3. EXPANSION VESSEL - An expansion vessel
complying with the requirements of BS 4814 must be
fitted to the system by means of a connection close to
the inlet side of the circulating pump in accordance with
the manufacturers instructions, the connecting pipe being
unrestricted and not less than 15mm (1/2 in) nominal size.
The volume of the vessel should be suitable for the
system water content and the nitrogen or air charge
pressure should not be less than the system static head
(See Table. 1).
Further details of sealed system design can be obtained
from BS 5449 and the British Gas publication entitled
'Specifications for Domestic Wet Central Heating
Systems'.
4. FILLING POINT - A filling point connection on the
central heating return pipework must be provided to
facilitate initial filling and pressurising and also any
subsequent water loss replacement / refilling. The sealed
primary circuits may be filled or replenished by means of
a temporary connection between the primary circuit and
a supply pipe provided a ‘Listed’ double check valve or
some other no less effective backflow prevention device
is permanently connected at the inlet to the circuit and
the temporary connection is removed after use. The
filling method adopted must be in accordance with all
relevant water supply regulations and use approved
equipment.
Your attention is drawn to, for GB: Guidance G24.2 and
recommendation R24.2 of the Water Regulations Guide.
for IE: the current edition of I.S. 813 “Domestic Gas
Installations”.
5. MAKE UP SYSTEM - A method of replacing water
lost from the system should be provided either by
means of a make up vessel of not more than 3 litres (5
pints) capacity, mounted above the highest point of the
system, or by re-pressurisation of the system.
6. VENTING - A method of venting the system during
filling and commissioning must be provided by fitting
automatic air vents or by venting manually.
Stop
Valve
Double
Check
Valve
7. HOT WATER STORAGE - The hot water storage
vessel must be of the indirect coil type.
Stop
Valve
8. COMPONENTS - All components used in the system
must be suitable for operation at 110°C (230°F) and at
the pressure allowed by the safety valve.
Mains
Inlet
Temporary
Hose
Fig. 14
14
© Baxi Heating UK Ltd 2011
CH
Return
7.0 Site Requirements
7.1
Location
NOTE: Due to the high efficiency of the boiler a
plume of water vapour will be discharged from the
flue. This should be taken into account when siting
the flue terminal.
1. The boiler must be fitted on a suitable flat and level
surface capable of supporting the weight. Any wall behind
the boiler must be at 90° to the floor to allow case top
cover to fit correctly.
Zone 2
2. The flue must pass through an outside wall or roof and
discharge to atmosphere in a position permitting
satisfactory removal of combustion products and
providing an adequate air supply.
Window
Recess
Zone 1
Zone 2
3. The boiler should be fitted within the building unless
otherwise protected by a suitable enclosure i.e. garage or
outhouse.
Zone 0
0.6 m
4. The boiler incorporates a frost protection device. This
will only protect the boiler. To ensure protection of the
system pipework and components it is recommended to
incorporate an appropriate device within the system
controls.
Window
Recess
Zone 2
Fig. A
In GB Only
Ceiling
Window Recess
Zone 2
Zone 1
Zone 2
Outside Zones
2.25 m
Zone 0
0.6 m
Fig. B
In GB Only
5. If the boiler is fitted in a room containing a bath or
shower, it can only be fitted in Zone 3, (Figs. A & B
shows zone dimensions for a bathtub. For other
examples refer to the Current I.E.E. Wiring Regulations).
Reference must be made to the relevant requirements:In GB this is the current I.E.E. Wiring Regulations and
Building Regulations.
In IE reference should be made to the current edition of
I.S. 813 “Domestic Gas Installations” and the current
ETCI rules.
6. If the boiler is to be fitted into a building of timber
frame construction then reference must be made to the
current edition of Institute of Gas Engineers Publication
IGE/UP/7 (Gas Installations in Timber Framed Housing).
7.2
Compartment
1. Where the boiler is installed in a cupboard or
compartment, no air vents are required for cooling
purposes providing that the minimum dimensions below
are maintained.
Width
400mm
Height
875mm
Depth
525mm
2. Any compartment should be large enough to house
the boiler only.
© Baxi Heating UK Ltd 2011
15
7.0 Site Requirements
5mm Min
390mm
5mm Min
7.3
15mm Min
(25mm if under
non removable
worktop)
Clearances (Figs. 15 &16)
1. These dimensions include the necessary clearances
around the boiler for case removal, spanner access and air
movement. Additional clearances may be required for the
passage of pipes around local obstructions such as joists
running parallel to the front face of the boiler. For side flue
installations also See Section 8.1, Figs. 20 & 21.
2. It is recommended that any worktop is removable for
servicing access.
850mm
7.4
Gas Supply
1. Check that the information concerning the state of
adjustment given on the data plate is compatible with local
supply conditions.
2. The gas installation should be in accordance with the
relevant standards. In GB this is BS 6891. In IE this is the
current edition of I.S. 813 “Domestic Gas Installations”.
3. The connection to the boiler is a 15mm tail on the gas
service cock. The tail protrudes through the boiler rear
panel and is protected by a transit bracket which may be
removed to aid connection.
Fig. 15
4. Ensure that the pipework from the meter to the boiler
is of adequate size. (If the boiler is further than 3 metres
from the Gas Meter 22mm pipe should be used). Do not
use pipes of a smaller diameter than the boiler gas
connection.
7.5
Electrical Supply
1. External wiring must be correctly earthed, polarised and
in accordance with relevant regulations/rules. In GB this is
the current I.E.E. Wiring Regulations. In IE reference
should be made to the current edition of ETCI rules.
2. The mains supply is 230V ~ 50Hz fused at 3A.
500mm Min
NOTE: “The method of connection to the electricity
supply must facilitate complete electrical isolation of the
appliance and system”.
For Servicing
Purposes
Connection may be via a fused double-pole isolator with a
contact separation of at least 3mm in all poles, which must
be in an accessible position to the user and serve the
boiler and system controls only.
There is no method of isolating the boiler at the user
interface.
3. Four core cable is required to supply the boiler as a
permanent live is necessary for the operation of the
condensate pump and frost protection.
5mm Min
Fig. 16
16
In Operation
© Baxi Heating UK Ltd 2011
520mm
7.0 Site Requirements
Condensate Pump Flow Graph
7.6
Condensate Drain - General
Failure to install the condensate discharge pipework
correctly will affect the reliable operation of the boiler.
Head (metres)
4
1. Ensure the discharge of condensate complies with any
national or local regulations in force.
BS 6798 & Part H1 of the Building Regulations give further
guidance.
3
2
2. If any further drain pipe is required (additional to that supplied
with the boiler), it should be run in a proprietary material
e.g. PVC, PVC-U, ABS, PVC-C or PP.
1
0
1.5
2
2.5
3.5
3
4
Flow (l/min)
3. Metal pipework is NOT suitable for use in condensate
discharge systems.
4. Any pipe fitted externally must be kept as short as possible to
minimise the potential of freezing and must be insulated using
waterproof material.
5. When discharging condensate into a soil stack or waste pipe
the effects of existing plumbing must be considered.
Min. radius 100mm
Gravity Drain min. fall 3°
Point ‘A’
7.7
Max. Head
3 metres
Boiler
Note: The point of discharge from
the pumped length of condensate
pipe (point ‘A’) must not be below
the level of the pump, whether
discharging direct into a drain or
into an additional gravity drain.
Alternative Horizontal
Discharge
Fig. A
10mm PVC Pipe
(8.5mm I.D.)
Securing Clip
8.5mm Ø O.D.
21.5mm Ø O.D. to fit
Condensate Pipe
Direct Connect
Fitting
Condensate Disposal
1. This boiler incorporates an automatic pumped condensate
system. See the graph opposite for available pump flow rates.
2. 3.5 metres of flexible 10mm PVC pipe are supplied with the
boiler. 0.5 metres of this length remains coiled within the boiler
to allow removal of the pump assembly. This must not be
uncoiled to provide extra length.
3. A fitting and securing clip (Fig. B) to accept the 10mm PVC
pipe and connect to 21.5mm overflow pipe is also supplied.
4. The 10mm pipe can be routed to a maximum of 3 metres
vertically and then discharge via gravity or be routed horizontally
(Fig. A). A combination of vertical and horizontal runs is
permissible.
5. The pipe must be supported, either using suitably spaced clips
or run within larger diameter pipe. When using clips take care
not to deform the pipe.
6. When routing the pipe through a wall it must be suitably
sleeved. Also the pipe must not be exposed to sources of heat,
and should be protected in locations where it may be damaged.
7. The pipe should be routed so that any sharp bends, dips and
loops are avoided. A minimum radius of 100mm is
recommended for any bends. No slope is necessary and air
breaks are not required on the pumped part of the condensate
run.
8. If the boiler is fitted in an unheated location the entire length
of condensate pipe should be treated as external, and run within
insulated larger diameter pipe.
Overflow Pipe
Fig. B
© Baxi Heating UK Ltd 2011
17
7.0 Site Requirement
Termination via internal discharge branch e.g
sink waste - downstream
Direct Connect Fitting
7.7
Pipe must terminate
above water level but
below surrounding surface
9. Ensure that the condensate can discharge freely (without
blockage or restriction of the pipe) into the drain.
Sink
10. Examples are shown of condensate pipe methods of
termination:10° 10°
Fig. C
Branch of Tee to be
± 10° from vertical
From Boiler
Termination to an internal soil and vent pipe
Direct Connect Fitting
From Boiler
Min. 450mm
Fig. D
Termination to a drain or gully
Pipe must terminate above
water level but below
surrounding surface
From Boiler
Fig. E
Termination to a purpose made
soak-away
500mm Min
From Boiler
Fig. F
18
Condensate Disposal (cont.)
© Baxi Heating UK Ltd 2011
Holes in the soak-away must
face away from the building
i)
via an internal discharge branch
(e.g. sink waste) - Fig. C.
ii) to an internal or external soil and vent pipe Fig. D.
iii) to a drain or gully - Fig. E. Ensure that the
condensate can discharge freely (without
blockage or restriction of the pipe) into the
drain.
iv) to a soakaway - Fig. F.
Terminal Position with Minimum Distance (Fig. 17)
(mm)
Aa Directly below an opening, air brick, opening
windows, etc.
300
Ba Above an opening, air brick, opening window etc.
300
Ca Horizontally to an opening, air brick, opening window etc.
300
D Below gutters, soil pipes or drain pipes.
25
E Below eaves.
25
F Below balconies or car port roof.
25
G From a vertical drain pipe or soil pipe.
25
(i) 25 (ii) 115
H From an internal (i) or external (ii) corner.
I
Above ground, roof or balcony level.
300
J
From a surface or boundary line facing a terminal.
600
K From a terminal facing a terminal (Horizontal flue).
1200
From a terminal facing a terminal (Vertical flue).
600
L From an opening in carport (e.g. door, window)
into the dwelling.
1200
M Vertically from a terminal on the same wall.
1500
N Horizontally from a terminal on the same wall.
300
R
S
T
U
From adjacent wall to flue (vertical only).
From an adjacent opening window (vertical only).
Adjacent to windows or openings on pitched and flat roofs
Below windows or openings on pitched roofs
300
1000
600
2000
7.0 Site Requirements
7.8
Flue
NOTE: Due to the high efficiency of the boiler a plume of
water vapour will be discharged from the flue. This should
be taken into account when siting the flue terminal.
1. The following guidelines indicate the general requirements
for siting balanced flue terminals.
For GB recommendations are given in BS 5440 Pt.1.
For IE recommendations are given in the current edition of I.S.
813 “Domestic Gas Installations”.
2. If the terminal discharges onto a pathway or passageway,
check that combustion products will not cause a nuisance and
that the terminal will not obstruct the passageway.
3. When siting the flue take into consideration the effect the
plume of water vapour may have on neighbours .
4. Adjacent surfaces close to the flue terminal may need
protection from the effects of condensation. Alternatively a flue
deflector kit (part no. 248167) is available.
Table. 2
a 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. See BS 5440 Pt. 1.
5. For installation of the flue into an internal corner at the
25mm dimension the flue plume deflector kit (part no. 248167)
must be fitted.
NOTE: The distance from a fanned draught boiler terminal
installed parallel to a boundary may not be less than 300mm*
in accordance with the diagram below, unless the flue deflector
kit is used (see 7.8.6 opposite)
6. * Reduction to the boundary is possible down to 25mm but
the flue plume deflector kit (part no. 248167) must be fitted.
300 min
Terminal
Assembly
*
7. If a terminal is less than 2 metres above a balcony, above
ground or above a flat roof to which people have access, then
a suitable terminal guard must be provided.
8. If required a suitable terminal guard (part no. 248484) is
available from Potterton for use with the flue deflector. See
also Section 8.8.
9. For fitting under low soffits and eaves the Plume
Displacement Kit or Flue Deflector Kit is recommended.
Top View Rear Flue
Fig. 16a
Property Boundary Line
J,K
IMPORTANT: If fitting a Plume
Displacement Flue Kit, the air inlet
must be a minimum of 150mm from
any opening windows or doors.
T
IMPORTANT:
• Only ONE 25mm clearance is allowed per installation.
• Under car ports we recommend the use of the plume
displacement kit.
• The terminal position must ensure the safe and
nuisance - free dispersal of combustion products.
U
Plume
Displacement Kit
N
R
M
I
D
E
C
I
A
I
F
S
I
F
J,K
B
L
G
A
A
H
H
Air Inlet
I
Likely flue positions requiring
a flue terminal guard
© Baxi Heating UK Ltd 2011
Fig. 17
Opening Window
or Door
Fig. 17a
150mm
MIN.
19
8.0 Flue Options
8.1
(ii)
(i)
Horizontal
Flue System Examples
Horizontal Flue Systems
Only a flue approved with the Potterton Gold FSB HE 30
can be used.
Concentric
The maximum equivalent lengths are 4m (horizontal) or
(vertical). Their lengths exclude the standard elbow and
flue/terminal assembly (horizontal) and terminal assembly
(vertical).
Any additional “in line” bends in the flue system must be
taken into consideration. Their equivalent lengths are:
Concentric Pipes:
(ii)
(i)
1M Extensions, 45° & 93° bends
are also available - see Section 9.0
IMPORTANT: All flue systems must be securely
supported at least once every metre. Suitable pipe
supports are available as accessories.
NOTE: Horizontal flue pipes should always be installed with a 1.5° fall from the
terminal to allow condensate to run back to the boiler.
This bend is equivalent to
0.5 metre
B
(ii)
(i)
This bend is equivalent to
0.5 metre
Total equivalent length =
A+B+2x45°Bends
20
© Baxi Heating UK Ltd 2011
0.5 m
1.0 m
NOTE: Flue length is measured from point (i) to (ii) as
shown.
Plume Displacement 70/110 dia Kit
A
45° bend
93° bend
Vertical Flue System
Examples (Twin Pipe)
8.0 Flue Options
8.2
Twin & Vertical Flue Systems
Concentric
The maximum equivalent lengths are 4m (vertical). Their
lengths exclude the standard elbow and terminal assembly
(vertical).
(ii)
(i)
Twin Flue
The total maximum equivalent flue length is 150m.
NOTE: Each 1m of flue duct should be calculated as 2m.
Any additional “in line” bends in the flue system must be
taken into consideration. Their equivalent lengths are:
Concentric Pipes:
135° bend
93° bend
0.5 m
1.0 m
Twin Flue Pipe:
135° bend (air duct)
135° bend (flue duct)
90° bend (air duct)
90° bend (flue duct)
1.3 m
2.6 m
4.8 m
9.6 m
(ii)
IMPORTANT: All flue systems must be securely
supported at least once every metre. Suitable pipe
supports are available as accessories.
(i)
Vertical Flue
System Examples
Total Equivalent Length =
A+B+C+1x90°Bend
Roof
Terminal
All vertical and angled runs must be included,
measured from the boiler adaptor (point X) to the
joint with the flue terminal (point Y). One 91.5°
bend or two 135° bends can be included without
reduction of the flue length.
The total equivalent length
for this example is
17.2 + 34.4 = 51.6 metres.
If further elbows are required the flue length must
be reduced by the following amounts:-
(ii)
1 metre for each 91.5° bend
0.5 metre for each 135° bend
C
B
Equivalent
Length Value
1m extension
135°bend
91.5°bend
This bend is equivalent to
1 metre
5
2
2
Sub total
5.0m
2.6m
9.6m
Equivalent Length Air Duct = 17.2m
A
(i)
1m
1.3m
4.8m
AIR DUCT
No of
fittings/pipes
Equivalent
Length Value
1m extension
135°bend
91.5°bend
2m
2.6m
9.6m
FLUE DUCT
No of
fittings/pipes
5
2
2
Sub total
10.0m
5.2m
19.2m
Equivalent Length Flue Duct = 34.4m
© Baxi Heating UK Ltd 2011
21
8.0 Flue Options
8.3
Key Accessory
Size
FLUE GROUP B
Concentric Flue System 110mm diameter
A1
Horizontal Flue Terminal
850mm
A
Horizontal Flue Terminal (incl elbow)
B
Flue Extension
1000mm
500mm
250mm
C
Flue Bend
93°
D
Flue Bend (pair)
135°
U
Pipe Support
110mm
T
Vertical Flue Boiler Adaptor
S
Flue Terminal Deflector
B
A1
A
E
T
K
FLUE GROUP P
Twin Flue System 80mm diameter
E
Flue Extension (pair)
F
G
J
W
S
D
C
Flue Accessories
Flue Bend (pair)
Flue Bend (2 pair)
Vertical Flue Boiler Adaptor Kit
Pipe Support (pair)
80mm
FLUE GROUP B,P
Vertical Flue Kits
K
Vertical Flue Terminal
L
Pitched Roof Flashing
M
Roof Cover Plate
N
Flat Roof Flashing
G
F
U,W
M
L
N
J
22
© Baxi Heating UK Ltd 2011
1000mm
500mm
250mm
90°
135°
25°/50°
Code No
243013BAX
236921
241695
241694
241692
241687
241689
243014BAX
5106888
248167
246137
246136
246135
5121560
5121561
242757
5111081
242802
243015
243131
243016BAX
8.0 Flue Options
For Vertical Flues
8.4
Vertical Flue
Adaptor
For Vertical Flue Systems
1. Undo the screws securing the blanking plate to the
boiler top panel. Discard the plate.
Gasket
2. Fix the vertical adaptor and gasket to the top panel with
the previously removed screws.
Blank Plate
8.5
For Twin Flue Systems
1. Undo the screws securing the blanking plate to the
boiler top panel. Discard the plate.
2. Fix both the air and flue adaptors with their gaskets
onto the boiler top panel. Secure with screws.
For Twin Flues
Air Duct
Adaptor
Gasket
Flue Duct
Adaptor
Gasket
© Baxi Heating UK Ltd 2011
23
8.0 Flue Options
8.6
1. In the case of a pitched roof 25 - 50 degrees, position
the lead tile to replace/flash over existing roof tiling. Make
an aperture in the roof suitable for the lower tube of the
roof terminal and ensure the integrity of the roof cover is
maintained. The adjustable plastic collar can either be
positioned on the lead tile or the lower tube of the roof
terminal prior to the final positioning of the vertical flue
through the tile. Check the collar is correctly located to suit
required roof pitch (either 25° to 38° or 37° to 50°). From
inside the roof adjust the flue to a vertical position and
secure to the roof structure with the clamp supplied.
Approx
1425mm
Cut the same
amount off the
Air Duct &
Flue Duct
2. For flat roof installations the aluminium flashing must be
incorporated into the roof covering and the appropriate
aperture made in the roof decking. The vertical flue is
lowered onto the flashing making sure the collar of the flue
locates securely with the flashing. (A mastic seal may be
necessary). From inside the roof, adjust the flue to a vertical
position and secure to the roof structure with the clamp
supplied.
Air Duct
Flue Duct
Push Fit Adaptor
IMPORTANT: If the boiler is not fitted immediately
after the flue system, temporary precautions must be
taken to prevent rain entry into the room of installation.
Any precautionary measures must be removed prior to
commissioning the boiler.
8.7
mm
0
80
Flue Dimensions
The standard horizontal flue kit allows for flue lengths
between 270mm (105/8”) and 800mm (32”) from elbow to
terminal (Fig. 18).
m
0m
27
For Roof Terminals
Flue Deflector
The maximum permissible equivalent flue length is: 4
metres.
NOTE: Each additional 45° of flue bend will account
for an equivalent flue length of 0.5m.
eg. 45° = 0.5m,
90° = 2 x 45° = 1m etc.
Fig. 18
8.8
Terminal Guard (Fig. 19)
Fig. 18a
1. When codes of practice dictate the use of terminal
guards, they can be obtained from most Plumbers’ and
Builders’ Merchants.
2. When ordering a terminal guard, quote the appliance
model number.
3. The flue terminal guard should be positioned centrally
over the terminal and fixed as illustrated.
8.9
Flue Deflector (Fig. 18a)
1. If required, push the flue deflector over the terminal end
and rotate to the optimum angle for deflecting plume.
Secure the deflector to the terminal with screws provided.
Fig. 19
24
© Baxi Heating UK Ltd 2011
9.0 Plume Displacement
Plume Outlet (‘Peak’
MUST be Uppermost)
9.1
Plume Displacement Kit (P.D.K.)
Kit No 5121371
Content of kit
1 70/110 Concentric Flue
1 1m 70 Dia Exhaust Flue Pipe
2 Support Brackets
1 93° Elbow/Plume Outlet Assembly
1 Flue Trim
2 “O” Rings
1 Elbow with Gasket
0.94 metre
1. This kit is recommended for installations where the
condensate plume emitted from the flue may cause a nuisance
or affect the surroundings.
2. The terminal must be positioned outside the building with
the outlet connection upwards.
3. The 70Ø pipe connects to the outlet of the concentric
terminal assembly. The elbow/plume outlet must be fitted to
the end of the 70Ø pipe.
NOTE: The plume outlet must always be at least 45° to
the wall, with the ‘peak’ uppermost to prevent rain entry
(Figs. A & B), and be at least 2 metres above ground level.
It must be secured as shown in Fig. C.
The outlet must be positioned so that any condensate
plume is directed away from adjacent surfaces.
Fig. C
45°
45°
Outlet must be
at least 45° from
wall face
4. It is possible to reduce or increase (with the addition of
extensions) the length of either or both the 70/110 concentric
and 70Ø exhaust.
‘Peak’ MUST be
Uppermost
5. Standard concentric flue extension kits may be added
between the boiler elbow and the terminal assembly.
6. The minimum length of the concentric flue is 100mm when
measured from the edge of the boiler flue elbow. There is a
further 45mm engagement into the elbow.
IMPORTANT: The maximum equivalent length of
concentric flue is:- 4 metres
Additional elbows may be fitted in the concentric flue, but
the equivalent length must be reduced by 1 metre (93°
elbow) or 0.5 metres (45° elbow).
500mm Min.
7. 70Ø 1 metre extensions (including support bracket), and
additional 93° & 45° elbows are available. Any additional 93°
& 45° elbows must be accounted for when calculating flue
lengths. 70Ø 93° elbows are equivalent to 3.5 metres of
straight length and 45° elbows to 1 metre.
NOTE: Permitted positions of the plume outlet relative to
doors, windows etc. are the same as for conventional
concentric flues as detailed in the main Installation &
Servicing Instructions and BS5440 Pt. 1. It is NOT
necessary to fit a terminal guard over the air inlet or the
plume outlet.
Fig. A
Outlet Connection
upwards
Fig. B
© Baxi Heating UK Ltd 2011
25
30
28
28
26
26
24
22
20
20
18
18
70Ø Exhaust (metres)
16
14
12
10
9.0 Plume Displacement
9.2
30
24
22
30
70Ø Exhaust (metres)
30
16
In the graph the solid line diagonal represents the
relationship between the concentric flue assembly (and any
extensions) and the 70Ø exhaust (and any extensions or
additional bends).
14
12
10
8
8
6
6
4
4
2
2
0
Example 1 - Not Permissible
If, for instance, a concentric length of 3.25 metres was
required and the 70Ø exhaust needed to be 10 metres the
graph shows that this combination would NOT be
permissible as the intersection point would be above the
solid diagonal line.
0
0
1
2
3
4
0
Concentric 70/110 Flue (metres)
1
2
3
4
Concentric 70/110 Flue (metres)
Example 1
Flue Lengths - Not Permissible
Determining Permissible Lengths - P.D.K.
Example 2
Flue Lengths - OK
30
Example 2 - Flue Lengths OK
Where both lengths have been determined they can be
applied to the graph to check that the installation is
permissible. For example, if it was known that 2 metres of
concentric flue and 4 metres of 70Ø exhaust were required,
the values could be applied to the graph as shown in
Example 2.. As the point of intersection of the dotted lines is
below the solid diagonal line, the combination of lengths is
shown to be acceptable.
28
26
24
22
20
70Ø Exhaust (metres)
30
18
16
14
12
10
8
6
4
2
0
0
1
2
3
4
Concentric 70/110 Flue (metres)
Example 3
Flue Lengths - OK
Support
Bracket
70Ø Exhaust
Example 3 - Flue Lengths OK
In the example shown, assume that the concentric part of
the flue needs to be 2 metres long. Find the position of ‘2’ on
the horizontal axis of the graph and then project upwards to
the solid diagonal line. This is represented by the vertical
thick dotted line. Where this dotted line intersects with the
solid diagonal line on the graph, project across to the vertical
axis. As can be seen this corresponds with 14 metres.
Therefore, the total equivalent length of the 70Ø exhaust
can be up to 14 metres. Any elbow equivalencies must be
accounted for i.e. 93° elbows are equal to 1 metre, each 45°
elbow to 0.5 metres.
45° Elbow
Flue Length - Worked Example
X
93° Elbow
Y
1 metre Extension
1 metre supplied in kit
Concentric 70/110 Flue
(MUST be installed
horizontally)
Concentric Flue
5117381
5117382
5117380
Fig. D
26
© Baxi Heating UK Ltd 2011
To calculate total length:Length of 70Ø supplied in kit =
3 x 1 metre Extensions =
1 x 93° Elbow =
2 x 45° Elbow =
1 metre
3 metres
1 metre
1 metre (0.5 metres each)
Total 70Ø =
6 metres
After consulting the table in Example 3 it can be determined
that the concentric flue could be up to approximately 3.25
metres long.
Additional Accessories
A - 93° Elbow
B - 45° Elbow (Pair)
C - 1 metre 60Ø Extension
In Fig. D opposite an additional 93° elbow and pair of 45°
elbows have been included in the 70Ø exhaust.
Also 3 straight extension pieces have been used.
9.0 Plume Displacement
9.3
This section of the
flue MUST be
horizontal
Min. 2 metres
General Fitting Notes - P.D.K.
1. Cut a hole in the external wall which the horizontal
concentric flue assembly will pass through.
2. When completed the terminal must be at least 2 metres
above ground level (Fig. E).
3. Measure and cut to size the concentric assembly and any
extensions that are being used.
4. Insert the concentric assembly through the hole from
outside the building and mark the position of the flue trim
securing holes.
Min. 0.3 metres
5. Drill and plug the wall to accept the flue trim securing
screws, and re-insert the concentric assembly through the
wall.
6. Connect any extensions that are being used to the
concentric assembly. Engage the extension or concentric
assembly in the boiler flue elbow.
7. Fit the boiler flue elbow to the boiler top panel, ensuring
the gasket is in place (Fig. F).
Fig. E
Ensure that the concentric assembly is horizontal and that
the external air inlet is to the bottom. Any extensions
should fall back to the boiler.
8. Use suitable brackets to support the concentric assembly
and any extensions, and make good inside and outside.
Secure the flue trim to the wall.
9. The 70Ø exhaust can now be fitted to the spigot at the
terminal end.
Fig. F
10. If it is necessary to shorten the 70Ø exhaust or any of
the extensions, the excess material must be cut from the
plain end of the pipe.
11. Determine the position of the 70Ø exhaust and mark
on the wall a suitable position for the support bracket. Drill
and plug the wall. If extensions are being used, a support
bracket is supplied in each kit.
12. Engage the M6 threaded part of the mounting bolt in
the boss on the support bracket. Using the bracket for
leverage, screw the mounting bolt into the plugged hole
until the bracket is secure and level (Fig. G).
13. Slacken the two screws securing the retaining strap to
the bracket, and pivot the strap aside to allow fitting the
70Ø exhaust.
Fig. G
14. Complete the installation of the 70Ø exhaust, securing
in the brackets. Fit the 93° elbow and plume outlet. Ensure
the plume outlet is at least 45° to the wall and that the
‘peak’ is uppermost.
15. Continue with installation and commissioning of the
boiler.
© Baxi Heating UK Ltd 2011
27
9.0 Plume Displacement
Plume Outlet
Elbow
9.3
General Fitting Notes - P.D.K. (cont.)
16. For aesthetic purposes it is permissible to route the
70Ø exhaust in an enclosed box, but the air inlet and
plume outlet MUST remain in free air.
500
mm
Min
.
Fig. H
200mm Min.
Fig. I
200mm Min.
Fig. J
28
© Baxi Heating UK Ltd 2011
17. It is also possible to separate the plume outlet from
the 93° elbow to allow the flue to be installed as shown
in Fig. H.
18. When the plume outlet is positioned under a balcony
or other projection (Figs. I & J) it must protrude at least
200mm (it is not necessary to extend it further than this).
Example
2m
Edge of Boiler
10.0 Installation
125mm
Example
V = 55mm
Horizontal
Side Flue
Centre Line
Centre
Hole
Template
EXAMPLE: If the boiler is 2 metres
away from corner of wall the flue
duct hole will be 55mm higher than
the horizontal side flue centre line.
This will maintain an approx. 1.5°
backfall to the boiler. It is especially
important to consider this when
fitting the boiler under a work top !
Wall Thickness
Flue Hole ø
up to 227mm
125mm core drill
up to 750mm
150mm core drill
up to 1200mm
175mm core drill
Fig. 20
13.5
27.5
55
82.5
110 (mm)
1.5°
V
10.1
Initial Preparation & Installation
1. Remove the outer carton.
2. For the boiler to operate correctly it must be level
in both planes. Place the fixing template in the
proposed boiler position ensuring that it is level.
3. Mark the centre of the flue hole (rear exit).
For side exit: project the horizontal side flue centre
line into the corner of the room and along the wall to
where the flue hole will be drilled. (Fig. 20).
The diagram (Fig. 21) shows the dimensions required
to ensure any horizontal flue is installed with the
correct fall to the boiler. Mark the offset (V) dimension
and if required, mark the position of the gas, water and
condensate pipes. Remove the template.
4. Cut the hole for the flue (minimum diameter
125mm, see table (Fig. 20) for wall thicknesses and flue
hole diameters).
Backfall to the boiler, ie. 2m flue offset (V) position 55mm
Flue Duct Hole
Offset V (mm)
Check Site Requirements before commencing.
5. Complete any pipework and wiring that will be
inaccessible once the boiler is in position.
6. Undo the securing screws and remove the facia,
front door panel and top panel (see Figs. 1 & 2 on
page 6). Remove the securing screw and disengage the
pipe access panel.
0.5
1.0
2.0
3.0
10.2
4.0
(metres)
Making the Water Connections
1. If desired the flow and return tails supplied with the
boiler can be fitted at this stage and secured with the
spring clips. The flow and return connections are
identified on the boiler rear panel. The flow pipe
incorporates a manual air vent.
Fig. 21
2. Note that the seal is made by use of an ‘O’ ring,
therefore some pipe movement will be evident even
though a water tight seal has been achieved. Excessive
force could result in damage to the connection.
3. Make all soldered joints before connecting the tails
to the boiler to avoid damaging the ‘O’ rings.
4. Refit the pipe access panel.
10.3
Flow
Tail
Hole for
Electrical
Cable
Return
Tail
Hole for
Condensate
Drain Outlet
Transit
Bracket
Gas
Connection
Fig. 22
© Baxi Heating UK Ltd 2011
Making the Gas Connection
1. The connection to the boiler is a 15mm tail on the
gas service cock. The tail protrudes through the boiler
rear panel and is protected by a transit bracket which
may be removed to aid connection (see Fig. 22).
2. If solder joints are being used for the gas connection,
remove the gas tap from the valve as excessive heat
may damage the ‘O’ ring seal.
10.4
Priming the Condensate Trap
1. Using a funnel and tube, carefully pour
approximately 1 cupful (250ml) of tap water into the
flue products exhaust at the terminal or flue elbow
sampling point to ensure a seal is made in the trap.
29
10.0 Installation
Wall Thickness
10.5
Fitting the Standard Flue
IMPORTANT: The flue should always be installed
with at least 1.5° fall from terminal to elbow, to
allow condensate to run back to the boiler.
At least
1.5°
1. The standard flue is suitable for lengths 270mm
minimum to 800mm maximum (measured from the
edge of the flue elbow outlet).
Rear Flue: maximum wall thickness - 575mm
Side Flue: maximum wall thickness - 535mm
2. For rear exit - measure the wall thickness
(Fig. 26) and to this dimension add 270mm. This
dimension to be known as (X).
i.e. (X) = wall thickness + 270
3. Take the flue and mark off (X) from the terminal end
as indicated in the diagram (Fig. 27).
4. For side exit - measure the distance from the edge
of the boiler case to the inner face of the wall (Fig. 26)
and to this dimension add the wall thickness + 280mm.
This dimension to be known as (Z).
i.e. (Z) = case to wall + wall thickness + 280
Edge of Boiler Case to Wall
Wall Thickness
5. Take the flue and mark off (Z) from the terminal end
as indicated (Fig. 27).
Before cutting check your dimensions !
6. The flue tubes are fixed together. Cut through both
tubes whilst resting the flue on the semi-circular packing
pieces. Deburr both tube ends.
Fig. 26
Waste
Fig. 27
NOTE: When cutting ensure the cut does not
interfere with the inner flue support bracket
(Fig. 27a).
(Z) = Side Exit
(X) = Rear Exit
Flue
Inner Flue Support Bracket
Fig. 27a
30
© Baxi Heating UK Ltd 2011
10.0 Installation
10.5
Inner Flue Support Bracket
Fitting the Standard Flue (Cont)
7. Ensure the inner flue support bracket is positioned
in the flue (Fig. 28).
8. Engage the flue into the flue elbow using soap
solution to ease the engagement, ensuring the flue
terminal is positioned as shown (Fig. 29).
Fig. 28
9. Place the gasket over the flue exit on the boiler.
10. Slide the flue assembly through the hole in the wall.
Flue
11. Engage the elbow on to the flue connection on top
of the boiler. Secure with the four screws supplied in
the kit.
12. Make good between the wall and air duct outside
the building ensuring the 3° drop between the terminal
and elbow.
Flue Elbow
Fig. 29
13. The flue trim should be fitted once the installation
is complete and the flue secure (Fig. 30). Apply a
suitable mastic to the inside of the trim and press
against the wall finish, making sure the brickwork is
dust free and dry.
14. If necessary fit a flue plume deflector kit and/or
terminal guard (see Sections 7.6 & 8.8).
Gasket
Fig. 30
Flue Trim
Shaded Areas indicate
Recommended Handling
Points
© Baxi Heating UK Ltd 2011
31
Min. radius 100mm
10.0 Installation
Gravity Drain min. fall 3°
Point ‘A’
Boiler
Note: The point of discharge from
the pumped length of condensate
pipe (point ‘A’) must not be below
the level of the pump, whether
discharging direct into a drain or
into an additional gravity drain.
Max. Head
3 metres
Alternative Horizontal
Discharge
10mm PVC Pipe
(8.5mm I.D.)
4. The 10mm pipe can be routed to a maximum of 3
metres vertically and then discharge via gravity or be
routed horizontally (Fig. A). A combination of vertical
and horizontal runs is permissible.
8.5mm Ø O.D.
21.5mm Ø O.D. to fit
Overflow Pipe
Termination via internal discharge branch e.g
sink waste - downstream
Direct Connect Fitting
Pipe must terminate
above water level but
below surrounding surface
10° 10°
Branch of Tee to be
± 10° from vertical
Sink
Fig. C
5. The pipe must be supported, either using suitably
spaced clips or run within larger diameter pipe. When
using clips take care not to deform the pipe.
6. When routing the pipe through a wall it must be
suitably sleeved. Also the pipe must not be exposed to
sources of heat, and should be protected in locations
where it may be damaged.
7. The pipe should be routed so that any sharp bends,
dips and loops are avoided. A minimum radius of
100mm is recommended for any bends. No slope is
necessary and air breaks are not required on the
pumped part of the condensate run.
From Boiler
Termination to an internal soil and vent pipe
Direct Connect Fitting
Min. 450mm
Fig. D
Termination to a drain or gully
10. Examples are shown of condensate pipe methods
of termination:i)
Pipe must terminate above
water level but below
surrounding surface
Termination to a purpose made
soak-away
From Boiler
500mm Min
Fig. E
From Boiler
Holes in the soakaway must face away
from the building
Fig. F
© Baxi Heating UK Ltd 2011
8. If the boiler is fitted in an unheated location the
entire length of condensate pipe should be treated as
external, and run within insulated larger diameter pipe.
9. Ensure that the condensate can discharge freely
(without blockage or restriction of the pipe) into the
drain.
From Boiler
32
1. 3.5 metres of flexible 10mm PVC pipe are supplied
with the boiler, ready connected to the pump. 0.5
metres of this length remains coiled within the boiler
to allow removal of the pump assembly. This must not
be uncoiled to provide extra length.
3. Feed the pipe through the grommet in the rear
panel and connect to the drain system.
Securing Clip
Fig. B
Making the Condensate Drain
Connection
2. A fitting and securing clip (Fig. B) to accept the
10mm PVC pipe and connect to 21.5mm overflow
pipe is also supplied. When using this fitting to connect
to a 21.5mm overflow tee piece the branch must be
vertical ± 10° (Fig. C).
Fig. A
Condensate Pipe
Direct Connect
Fitting
10.6
via an internal discharge branch
(e.g. sink waste) - Fig. B.
ii) to an internal or external soil and vent
pipe - Fig. C.
iii) to a drain or gully - Fig. D. Ensure that
the condensate can discharge freely
(without blockage or restriction of the
pipe) into the drain.
iv) to a soakaway - Fig. E.
10.0 Installation
10.7
Making The Electrical Connections
WARNING: This boiler must be earthed
IMPORTANT: Four core cable is required to supply the
boiler as a permanent live is necessary for the operation
of the condensate pump and frost protection.
1. The electrical connections are on the right hand side of the
boiler. Depending upon the nature of the installation it may
be preferable to wire up to the boiler first before
manoeuvering into position.
2. Undo the two screws securing the cable clamp and place
to one side (Fig. 31).
3. Route the incoming electrical cable(s) from the system
control wiring centre through the grommet in rear of the
boiler and the grommet in the support bracket. This will
prevent damage to the cable(s).
4. Lay the cable through the cable clamp to gauge the length
of wire required when it is connected to the 4-way terminal
block.
5. Connect the (S/L), ( ), (N) and (P/L) wires to the
4-way terminal block (Fig. 33) and refit the cable clamp
(Fig. 31).
Fig. 31
Cable Clamp
INTEGRAL PROGRAMMER
If the optional integral programmer is being fitted it can be
done at this stage. Consult the instructions supplied in the
programmer kit.
Check the electrical installation for;
earth continuity, short circuits, resistance to earth, correct
polarity and fuse rating.
Fig. 32
4-way Terminal Block
S/L
N
P/L
Fig. 33
Wiring from System
Controls
S/L Switched Live
Earth
N
Neutral
P/L Permanent Live
© Baxi Heating UK Ltd 2011
33
11.0 Electrical
11.1
Schematic Wiring Diagram
Condensate Removal System
g/y
Condensate
Over-Level Switch
Fan
Overheat
Thermostat
Condensate
Trap
Condensate
Level Switch
Condensate Pump
N
L
bk
Spark
Flame
Electrode Detection
Electrode w
Flow
Thermistor
Gas
Valve
bk
Flow
Overheat
Thermostat
gy
w
bk
gy
gy
r
g/y
r
b
r
CH
Flow
Switch
325 Vdc
DC Fan
bk
gy
br
r
w
b
br g w
Fuse 3.15 AT
g/y
op
PCB
b
g/y
CH Out
DHW Out
DHW Off
Out
br
Optional Internal Timer
o
Electrical
Filter
v
Earths not shown to aid
clarity of diagram
o
y
b
Permanent Live
Neutral
Earth
Switched Live
S/L
Key To Wiring Colours
34
b - Blue
r - Red
bk - Black
g - Green
w - White
g/y- Green/Yellow
br - Brown
op - Opaque
gy - Grey
y - Yellow
o - Orange
v - Violet
© Baxi Heating UK Ltd 2011
Boiler Connection
(4 Core Cable)
N P/L
br
11.0 Electrical
11.2
Illustrated Wiring Diagram
P/L N
S/L
Flow
Thermistor
b
g/y
r
r
CH
Flow Switch
g/y
br
Electrical
Filter
br
b
gy
gy
g/y
Spark
Electrode
Flame
Detection
Electrode
o
Main
PCB
g/y
w
Layout of PCB Pins
op
br
Condensate Trap
w
g
r
g/y
bk
Gas Valve
w
b
r
gy
w
bk
gy
br
b
bk
Fan Overheat
Thermostat
bk
Fan
Flow Overheat
Thermostat
g/y
Wiring Key
b
bk
br
r
w
g/y
g
gy
op
y
© Baxi Heating UK Ltd 2011
- Blue
- Black
- Brown
- Red
- White
- Green/Yellow
- Green
- Grey
- Opaque
- Yellow
35
12.0
12.1
Commissioning the Boiler
Commissioning the Boiler
WARNING: The PCB Control and Fan Assembly
are 325 Vdc. Isolate at supply before access.
1. Reference should be made to BS:EN 12828 & 14336 when
commissioning the boiler.
Flue Sampling Point
Manual Air Vent
Gas Service
Cock
Open
Fig. 34
6. Turn the gas supply on and purge according to in GB BS 6891
and in IE I.S. 813 “Domestic Gas Installations”.
OUT
IN
IMPORTANT: The combustion for this appliance has been
checked, adjusted and preset at the factory for operation on
the gas type specified on the appliance data plate. No
measurement of the combustion is necessary. Do not adjust
the air/gas ratio valve.
Fig. 36
Inlet Gas Pressure Test Point
Turn the Central Heating Control Knob clockwise
Central Heating
to increase or anticlockwise to decrease the
Control Knob
(No OFF Position) boiler flow temperature.
Reset Button
The Reset Button should extinguish the
Flame Failure Light and restore normal
operation.
Mains On
(Green Light)
This indicates that there is electricity to the Boiler.
Burner On
(Green Light)
This indicates that the Burner has fired up
and is heating your system.
Flame Failure
(Red Light)
If Flame Failure Light is ON. Press the Reset
Button. If Flame Failure occurs persistently
consult your Installer or Service Engineer.
Reset
4. Refill the system with inhibitor following the inhibitor
manufacturer’s instructions and BS 7593 Code of Practice for
Treatment of Water in Domestic Hot Water Central Heating
Systems (see Section 6.2).
7. Turn the gas service cock anticlockwise to the ON position
and check for gas tightness up to the gas valve (Fig. 34). Turn the
power to the boiler ON.
DO NOT check gas pressure here
High
3. Flush the whole system using a suitable flushing agent (see
Section 6.2) and vent the radiators. Check for water leaks.
5. Complete the label supplied with the inhibitor and attach to
the inside of the boiler case. Detail of system treatment should
be added for future reference.
Fig. 35
Low
2. At the time of commissioning, complete all relevant sections
of the Benchmark Checklist at the rear of this publications.
Condensate Pump This indicates that the Condensate Pump is running.
The pump ONLY runs when the condensate reservoir is full.
(Green Light)
8. Having checked:
•That the boiler has been installed in accordance with
these instructions.
•The integrity of the flue system and the flue seals.
•The integrity of the boiler combustion circuit and the
relevant seals.
Proceed to put the boiler into operation as follows:
12.2
Priming the Condensate Pump
1. Using a funnel and tube, carefully pour approximately 1litre of
tap water into the flue products exhaust at the terminal or flue
elbow sampling point to fill the trap and allow the condensate
pump reservoir to fill.
2. Continue filling with water until the condensate pump
operates.
3. Check that the condensate drain pipework is not leaking and
that it is discharging correctly to drain.
4. See Fig. 36a for operation of LEDs on boiler facia.
Fig. 36a
36
© Baxi Heating UK Ltd 2011
12.0 Commissioning the Boiler
12.3
Check the Operational (Working) Gas
Inlet Pressure
1. Ensure that all controls are calling for heat and
maximum load is applied to the system.
2. With the boiler operating in the maximum rate
condition check that the operational (working) gas
pressure at the inlet gas pressure test point is in
accordance with B.S. 6798 & B.S. 6891.
3. Ensure that this inlet pressure can be obtained with
all other gas appliances in the property working.
Measure the Gas Rate
4. With any other appliances & pilot lights turned OFF
the gas rate can be measured. It should be as shown in
Section 4.0 Technical Data.
DO NOT check gas pressure here
IN
OUT
5. Carefully read and complete all sections of the
Benchmark Commissioning Checklist at the rear of this
publication that are relevant to the boiler and
installation. These details will be required in the event of
any warranty work. The publication must be handed to
the user for safe keeping and each subsequent regular
service visit recorded.
Fig. 36b
Inlet Gas Pressure Test Point
© Baxi Heating UK Ltd 2011
6. For IE, it is necessary to complete a “Declaration of
Conformity” to indicate compliance with I.S. 813. An
example of this is given in I.S. 813 “Domestic Gas
Installations”. This is in addition to the Benchmark
Commissioning Checklist.
37
13.0
13.1
Completion
Fitting The Case Panels & Facia
1. Refit the case top panel and front door, securing with
the screws previously removed (Fig.37).
2. Locate the facia panel and secure with the screws
previously removed (Fig. 38).
3. The “Important Ventilation Information” label can be
removed unless the boiler is installed in an unventilated
compartment.
13.2
‘Benchmark’ Checklist
1. Carefully read and complete all sections of the
Benchmark Commissioning Checklist at the rear of this
publication that are relevant to the boiler and
installation. These details will be required in the event
of any warranty work. The publication must be handed
to the user for safe keeping and each subsequent
regular service visit recorded.
Outercase Securing
Screws
2. For IE, it is necessary to complete a “Declaration of
Conformity” to indicate compliance to I.S. 813. An
example of this is given in I.S. 813 “Domestic Gas
Installations”. This is in addition to the Benchmark
Commissioning Checklist.
Fig. 37
13.3
Handover
1. Instruct the user in the operation of the boiler and
system controls. Hand over the User’s Operating,
Installation and Servicing Instructions, giving advice on
the necessity of regular servicing.
2. Demonstrate to the user the action required if a gas
leak occurs or is suspected. Show them how to turn off
the gas supply at the meter control, and advise them
not to operate electric light or power switches, and to
ventilate the property.
3. Show the user the location of the system control
isolation switch, and demonstrate its operation.
4. Advise the user that they may observe a plume of
vapour from the flue terminal, and that it is part of the
normal efficient operation of the boiler.
Facia Securing Screws
Fig. 38
38
© Baxi Heating UK Ltd 2011
14.0 Servicing the Boiler
14.1
Annual Servicing
WARNING: The PCB Control and Fan
Assembly are 325 Vdc. Isolate system controls
before access.
IMPORTANT: When servicing ensure that both the gas and
electrical supplies, including Switched and Permanent Live to the
boiler are isolated before any work is started.
The four LEDs on the facia will all be OFF.
It is important to isolate the electrical supply at the system
isolation switch as it is not possible to do this on the boiler itself.
Hazardous materials are not used in the construction of this
product, however reasonable care during service is
recommended - see Section 1.2.
When replacing the combustion box door after servicing it is
essential that the retaining screws are tightened fully.
1. For reasons of safety and economy, it is recommended that
the boiler is serviced annually. Servicing must be performed by a
competent person in accordance with B.S. 7967-4.
2. After servicing, complete the relevant Service Interval Record
section of the Benchmark Commissioning Checklist at the rear of
this publication.
IMPORTANT: During routine servicing, and after any
maintenance or change of part of the combustion circuit, the
following must be checked:• The integrity of the complete flue system and the flue seals.
• The integrity of the boiler combustion circuit and relevant
seals as described in Section 14.2.
• The operational gas inlet pressure as described in Section
12.2.1 to 12.2.3 and the gas rate as described in 12.2.4.
• The combustion performance as described in ‘Check the
Combustion Performance’ (14.1.4 to 14.1.6 below).
3. Competence to carry out Checking Combustion
Performance
B.S. 6798 ‘Specification for Installation & Maintenance of Gas
Fired Boilers not exceeding 70kW’ advises that:• The person carrying out a combustion measurement should
have been assessed as competent in the use of a flue gas
analyser and the interpretation of the results.
• The flue gas analyser used should be one meeting the
requirements of BS7927 or BS-EN50379-3 and be calibrated
in accordance with the analyser manufacturers’ requirements.
• Competence can be demonstrated by satisfactory
completion of the CPA1 ACS assessment, which covers the
use of electronic portable combustion gas analysers in
accordance with BS 7967, Parts 1 to 4.
Check the Combustion Performance (CO/CO2 ratio)
4. Set the boiler to operate at maximum rate as described in
Section 12.2.
5. Remove the cap from the flue sampling point, insert the
analyser probe and obtain the CO/CO2 ratio. This must be
less than 0.004.
6. If the combustion reading (CO/CO2 ratio) is greater than
this, and the integrity of the complete flue system and
combustion circuit seals has been verified, and the inlet gas
pressure and gas rate are satisfactory either:
• Perform the ‘Annual Servicing - Inspection’ (Section 14.2) &
re-check.
• Replace the gas valve (Section 15.8) & re-check.
© Baxi Heating UK Ltd 2011
39
14.0
14.2
Servicing the Boiler
Annual Servicing - Inspection
WARNING: The PCB Control and Fan
Assembly are 325 Vdc. Isolate system
controls before access
1. Ensure that the boiler is cool.
2. Remove the facia and front door panel.
3. Release the four 1/4 turn screws securing the air box door
panel and remove the panel (Fig. 39).
4. Disconnect the three leads from the terminals (Fig. 40).
5. Undo the four screws securing the combustion box door
and remove the door (Fig. 41).
6. Visually check for debris/damage and clean or replace if
necessary the following:
Air Box Door Panel
Fig. 39
Spark
Sleeve
Sensing
Lead Terminals
Earth
Fig. 40
Combustion Box
Door Panel
40
© Baxi Heating UK Ltd 2011
Fig. 41
a) Burner.
b) Heat exchanger fins.
c) Fan compartment (Check also for condensate leaks).
d) Insulation.
e) Door seals-Important: Pay particular attention to
the condition of the combustion box door seals.
f) Electrodes.
g) The condensate trap.
h) The condensate pump
i) Top of heat exchanger.
14.0
14.2
Flue Sampling Point
Servicing the Boiler
Annual Servicing - Inspection (Cont)
7. To clean the heat exchanger and burner proceed as
follows:
a) Disconnect the electrical leads to the fan component
protection sensor (Fig. 42).
Fig. 41a
b) Loosen the screw retaining the gas injector pipe at
the venturi (Fig. 42).
c) Undo the two wing nuts to disconnect the fan
(Fig. 42).
d) Remove the fan and disconnect the electrical supply
to it (Fig. 42).
e) Remove the gas injector pipe from the gas valve
(push-fit) (Fig. 42).
Injector Pipe
f) Remove the condensate trap drain plug and place a
vessel underneath to catch the condensate (care should
be taken as this could be hot). The condensate drain
pipe may be removed to increase access.
Injector Pipe Retaining
Screw
g) Undo the condensate trap securing nut, lock nut and
the condensate drain pipe. Remove the condensate trap
and disconnect the sensor leads (Fig. 43). Clean the trap
and refit the drain plug.
Securing Nut
Fan
h) Remove the two screws securing the burner and
remove the burner. Visually inspect the internal burner
baffle for obstruction, check seal around baffle for
cracks/damage. Clean with a soft brush.
Sensor
Leads
Protection
Sensor Leads
Fig. 42
Electrical Supply
i) Loosen the two screws retaining the heat exchanger
support bracket and slide to the left to remove
(Fig. 44).
Condensate
Trap
Wing Nuts
Lock Nut
Service Drain
Plug
Trap to Condensate
Pump Inlet Pipe
Central Insulation Panel
Fig. 43
Burner
Combustion
Box Base
Heat Exchanger
Support Bracket
j) Remove the four screws securing the heat
exchanger/combustion box base and withdraw the
base.
k) Lower the central insulation panel and check
condition (Fig. 44). Replace the lower insulation pad if
necessary.
l) Ensure the heat exchanger fins are clear of any
obstruction.
m) Check condition of all seals. Important: Pay
particular attention to the condition of the
combustion box door seals.
n) Reassemble in reverse order and check for leaks.
8. Check the operation of the condensate pump and
drain pipework (see Section 10.1)
Burner Securing
Screws
Combustion Box Base
Securing Screws
© Baxi Heating UK Ltd 2011
Fig. 44
9. Check CO/CO2 ratio at flue sampling point (Fig.41a).
See section 4.0.
10. Complete the relevant Service Interval Record
section of the Benchmark Commissioning Checklist at
the rear of this publication and then hand it back to the
user.
41
15.0
15.1
Changing Components
Changing Components & Preparation
WARNING: The PCB Control and Fan
Assembly are 325 Vdc. Isolate system
controls before access.
IMPORTANT: Ensure that both the gas and electrical
supplies, including Switched and Permanent Live to the
boiler are isolated before any work is started.
The four facia LEDs will be all OFF.
It is important to isolate the electrical supply at the
system isolation switch as it is not possible to do this
on the boiler itself.
Hazardous materials are not used in the construction of
this product, however reasonable care is recommended
- see Section 1.2.
When replacing the combustion box door it is essential
that the retaining screws are tightened fully.
Remove the facia and front door panel.
For the replacement of some components it will be
necessary to drain the boiler. Proceed as follows:-
Fig. 45
Heat Exchanger
Manifold
1. Isolate the water circuit and drain the system as
necessary. A drain point is located on the heat
exchanger manifold at the right hand side of the boiler
(Fig. 45) to enable the heat exchanger to be drained.
2. Place a tube on the drain point to drain water away
from the electrics. Turn anticlockwise to open (Fig. 45).
Drain Point
Tube
3. After changing a component recommission the boiler
where appropriate and check the inhibitor
concentration (see Section 6.2 and 10.1).
Electrical Connections
Flow Temperature Thermistor (Red)
Pipe Access
Panel
The thermistor, safety thermostat, interface PCB and
the flow switch can be accessed after removal of the
pipe access panel (Fig. 46).
15.2
Safety
Thermostat
(Black)
Fig. 46
Flow Temperature Thermistor and
Safety Thermostat (Fig. 46)
1. The procedure is the same for both the thermistor
and the safety thermostat.
2. Remove the pipe access panel and disconnect the
electrical connections from the sensor.
3. Remove the sensor from the pipe.
4. Fit the new thermistor or safety thermostat and
reassemble in reverse order.
42
© Baxi Heating UK Ltd 2011
15.0
Pipe Access
Panel
15.3
Changing Components
Flowswitch (Fig. 47)
1. Drain the boiler (see Section 13.1 paragraph 2 & 3).
2. Remove the pipe access panel and remove the securing
clip from the ‘O’ ring joint between the flow pipe and the
system. Undo screws on support bracket.
Support Bracket
3. Remove the securing clip from the ‘O’ ring joint
between the flow pipe and the flowswitch.
4. Remove the two screws securing the flow switch to the
boiler.
5. Disconnect the inline electrical connection and remove
the flowswitch.
Flow Switch
6. Fit the new flowswitch and reassemble in reverse order.
7. Recommission the boiler and check the inhibitor
concentration (see Section 6.2 and 10.1).
Flow Pipe
15.4
Fig. 47
Condensate Pump - Complete (Fig. 47a)
1. Remove the pipe from the trap to the pump inlet and
disconnect the electrical plug.
2. Lift the pump off the support studs and ease it
forwards. Release the snap fit clip and disconnect the
condensate outlet pipe.
Clip
Over Level Switch
3. Connect the condensate outlet pipe to the new pump
using the new clip provided.
4. With the new pump in place on the studs, refit the trap
discharge pipe, ensuring the ‘O’ ring is in place. Reconnect
the electrical plug.
5. Neatly coil the excess condensate outlet pipe adjacent
to the pump, ensuring that it is not kinked or restricted.
6. Check operation of the pump - See Section 10.2.
15.5
Condensate Pump - Level Switches
(Fig. 47a)
1. Remove the complete Condensate Pump as described
in Section 13.4, and remove the cover.
Condensate Pump
(Cover Removed)
Fig. 47a
2. Disconnect the wires from the switch(es) and remove
the retaining screws. On the Level Switch remove the
circlip and washers connecting the plunger to the
actuating arm.
3. Fit the new switch(es). Align the actuating arm of the
Level Switch with the plunger, ensuring that there is a
washer at each side of the arm.
Level Switch
4. Reconnect the wires. On the Over Level Switch there
is no connection to the lower spade terminal.
5. Check operation of the pump - See Section 10.2.
© Baxi Heating UK Ltd 2011
43
15.0
15.6
Control
Knob
Changing Components
PCB (Figs. 48 & 49)
WARNING: The PCB Control and Fan
Assembly are 325 Vdc. Isolate system
controls before access.
1. Pull the control knob off the spindle and remove the
plastic button cover. Refit them onto the new PCB
(Fig. 48).
2. Remove the top right hand securing screw and swing
out the PCB housing. Remove the PCB cover and
disconnect the electrical plugs noting their positions
3. Remove the screw securing the PCB to the housing.
The PCB can be removed from the housing.
4. Ensure that the two jumpers are fitted to the new
PCB as shown (Fig. 49).
Fig. 48
PCB Housing Securing
Screw
Plastic Button
Cover
Hinge open
PCB Housing
Blue (CN11) Jumper
Red (CN12) Jumper
44
© Baxi Heating UK Ltd 2011
Fig. 49
5. Reconnect the plugs, fit the new PCB to the housing
and reassemble in reverse order.
15.0
Changing Components
The fan and venturi, gas valve, injector pipe,
condensate trap, fan protection sensor, spark and
sensing electrodes can be accessed and changed on
the removal of the airbox door panel.
1. Remove the airbox door panel by loosening the four
1
/4 turn screws (Fig. 50).
15.7
Spark and Sensing Electrodes
(Fig. 51)
1. Disconnect all three leads from tabs.
Spark
Opaque cable
Earth
Green/Yellow cable
Sensing
White cable
2. Remove the two screws securing each of the
electrodes to the combustion box door and remove the
electrodes.
3. Fit the new electrodes (and new gasket, as required)
and reassemble in reverse order.
Air Box Door Panel
Fig. 50
15.8
Fan (Fig. 52)
WARNING: The PCB Control and Fan
Assembly are 325 Vdc. Isolate system
controls before access.
1. Loosen the screw holding the injector pipe into the
venturi.
2. Remove the electrical connections to the fan and
protection sensor on the fan.
Sensing
Spark
Combustion
Box Door
Earth
3. Remove the wing nuts securing the fan to the base of
the combustion box.
Fig. 51
4. Lower the fan and remove.
5. If changing the fan, remove the screws securing the
venturi and fan protection sensor bracket, noting the
positions of the injector opening and sensor bracket, fix
them to the new fan.
Injector Pipe
Injector
Opening
Screw
6. Fit the new fan and reassemble in reverse order.
Gasket
Fan
The injector pipe, condensate trap and gas valve can
be changed after the removal of
the fan.
Protection
Sensor
Venturi
Electrical Connections
Fig. 52
Electrical Connection
© Baxi Heating UK Ltd 2011
Wing Nuts
45
15.0
Changing Components
The removal of the fan is necessary to enable the changing of
the injector pipe, condensate trap and gas valve (see section
13.6).
15.9
Injector Pipe (Fig. 53)
1. Remove the injector pipe by pulling out from the ‘O’ ring
joint in the gas valve.
2. Fit the new injector pipe and reassemble in reverse order.
Injector Pipe
15.10
IMPORTANT: After replacing the valve the CO2 must be
checked as detailed in Section 14.1.4 to 14.1.6. Only
change the valve if a suitable calibrated combustion
analyser is available, operated by a competent person see Section 14.1.3.
Gas Valve
Securing Screws
Case Pressure Pipe
1. Isolate gas supply and disconnect the gas tap by removing
the four screws.
Gasket
2. If required remove the condensate pump to increase access
(see Section 13.4) and undo the case pressure pipe from the
valve.
Boiler Side
Aluminium
Spacer
3. Disconnect the electrical plug from the gas valve.
4. Remove the fan (see Section 13.6) and injector pipe.
‘O ring’
Gas Valve
Gas Tap
Fig. 53
Gas Valve (Fig. 53)
Electrical Plug
5. Remove the two gas valve securing screws from inside the
air box holding the gas valve, and remove the valve.
6. Remove the aluminium spacer and its gasket from the gas
valve.
7. Fit the aluminium spacer and its gasket to the new valve.
8. Fit the new gas valve and reassemble in reverse order.
NOTE: Check for gas tightness after replacing gas valve.
9. Check the CO2 level. If the level is greater than that quoted,
telephone the Technical Enquiries for further advice.
Sensor
Leads
Securing
Nut
15.11
Condensate Trap (Fig. 54)
1. Disconnect the condensate trap from the base of the heat
exchanger.
2. Disconnect the condensate drain ‘O’ ring connection from
the condensate trap and condensate pump. For ease of access
also remove the pump.
Condensate
Trap
3. Undo the condensate trap lock nut.
4. Remove the condensate trap from the boiler.
5. Disconnect the sensor leads.
Lock Nut
Service Drain
Plug
Trap to Condensate
Pump Inlet Pipe
46
© Baxi Heating UK Ltd 2011
Fig. 54
6. Fit the new condensate trap and reassemble in reverse
order. When refitting the pipe from the trap to the pump
ensure that all seals and connections are made.
7. Prime the condensate trap (fill first chamber), check for leaks
(see Section 8.5).
15.0
Combustion Box
Door Panel
Changing Components
The burner and heat exchanger can be changed after
removal of the combustion box door. To change the
heat exchanger, the fan and burner must be removed
first (see section 13.6 and 13.10).
1. Remove the combustion box door by removing the
four securing screws (Fig. 55).
IMPORTANT: On refitting the combustion box
door check the condition of the combustion box
door seals.
15.12
Fig. 55
Burner (Fig. 56)
1. Remove the two screws securing the burner to the
base of the combustion box.
Burner
Support
Bracket
2. Remove the burner carefully from the combustion
box base.
Return
Connection
3. Check the burner seal on the heat exchanger base,
replace if necessary. Fit the new burner and reassemble
in reverse order.
Fig. 57
15.13
Heat Exchanger
Fig. 56
1. Drain the boiler (see section 13.1 paragraph 2 & 3).
Flow
Switch
Securing Screws
2. Remove all components in the base of the airbox.
3. Undo the screws on the support bracket. Remove
the screws securing the flow switch and return
connections and remove the connections (Fig. 57).
4. Remove the screws securing the heat exchanger
manifold and remove the manifold (Fig. 58).
5. Ease the combustion box left hand side panel to clear
the stud, lift the heat exchanger assembly (Fig. 59) and
rotate the bottom upwards whilst pulling it forwards
out of the airbox.
Fig. 58
6. Ensure that the heat exchanger is disengaged from
the flue elbow and clear of the stud in the left hand side
of the combustion box.
Heat Exchanger
Manifold
7. Fit the new heat exchanger and reassemble in reverse
order.
8. Recommission the boiler and check the inhibitor
concentration (see Section 6.2 and 10.1).
Heat Exchanger
Assembly
Fig. 59
© Baxi Heating UK Ltd 2011
47
15.0
15.14
Changing Components
Heat Exchanger Lower Insulation Pad
(Fig. 60)
1. Remove all components in the base of the airbox.
2. Remove the burner (see section 13.10).
3. Remove the four bolts securing the combustion box
base.
4. Remove the combustion box base.
5. Pull the central insulation panel down from the
centre of the heat exchanger and remove the lower
insulation pad.
Central Insulation Panel
Upper Insulation
Pad
6. Fit the new insulation pad and reassemble in reverse
order.
Lower Insulation
Pad
15.15
Fig. 60
Burner
Heat Exchanger Upper Insulation Pad
(Fig. 60)
1. Remove all components in the base of the airbox.
2. Remove the burner (see section 13.10).
Combustion
Box Base
Support Bracket
3. Remove the heat exchanger (see section 13.11).
4. Remove the four bolts securing the combustion box
base.
5. Remove the combustion box base.
Burner Securing
Screws
Combustion Box Base
Securing Screws
6. Pull the central insulation panel down from the
centre of the heat exchanger.
7. Fit the new insulation pad and reassemble in reverse
order.
48
© Baxi Heating UK Ltd 2011
16.0
Short Parts List
Short Parts List
A
B
C
Key
No.
G.C.
No.
Description
A
E06 058
Flow Temperature
B
E06 059
C
E06 060
Manufacturers
Part No.
Thermistor (Red)
240670
Flow Switch
242459
Safety Thermostat
(Black)
242235
D
PCB
5129147
E
Fan
5109925
F
Gas Valve
241900
Viewing Window
242484
H
Condensate Trap
5111714
I
Electrodes Kit
5132366
J
Burner Assy
5107430
Heat Exchanger Assy
242497
L
Control Knob
5109996
M
Condensate Pump
5117661
N
Level Switch
5117591
O
Over Level Switch
5117592
E
G
D
G
K
E06 085
E06 097
F
I
H
M
K
J
N
O
L
© Baxi Heating UK Ltd 2011
49
17.0
Fault Finding
NOTE: The fan is supplied with 325 Vdc.
Fan Fault Finding should only be carried out after the
boiler has been electrically isolated.
Mains On
Boiler On
Lockout
LED Light
(Green)
LED Light
(Green)
LED Light
(Red)
General Fault Finding should only be carried out by
someone who is appropriately qualified.
* denotes LED flashing
Lights
Off Off Off
*
Lights
Off On
Lights
On
* *
Lights
On Off On
YES
YES
YES
Go to Electrical Supply
section of the fault finding
instructions.
Live & Neutral Reversed
Incoming Live and Neutral
reversed.
Go to Dry-Fire
section of the fault finding
instructions.
Lights
On
On
*
*
*
YES
* *
YES
YES
PCB Fault
Replace PCB.
Lights
On On
YES
PCB Fault
Replace PCB.
Lights
On On onn
YES
PCB Fault
Replace PCB.
Lights
On
YES
Go to Condensate Pump
section of the fault finding
instructions.
*
Go to Ignition Lockout section
of the fault finding instructions.
Go to Overheat Lockout
section of the fault finding
instructions.
Go to Fan Lockout
section of the fault finding
instructions.
* *
50
© Baxi Heating UK Ltd 2011
LV Wiring Harness
Ensure the small 8 way
connector is securely plugged
into the PCB. If the fault
persists replace wiring harness.
Lights
On onn
*
Lights
On on onn
YES
Low Electrical Supply
Incoming Voltage less than
180V. Check System
Controls & System Wiring.
Otherwise contact Electricity
Provider.
YES
*
Lights
On Off on
*
Go to Thermistor section
of the fault finding
instructions.
Lights
On On On
*
YES
Lights
Off onn
YES
Lights
Off Off Off
ELECTRICAL SUPPLY
NO
240V at A ?
17.0
Fault Finding
No Permanent Live to
boiler. Check Mains Fuse
and
System Wiring.
A
B
YES
NO
240V at B ?
No Switched Live to
boiler. Check System
Controls and System
Wiring.
N
S/L
P/L
YES
NO
240V at C ?
Check P/L wiring from
terminal block to PCB.
YES
NO
240V at D ?
Check S/L wiring from
terminal block to PCB.
YES
NO
PCB fuse OK ?
Check for short circuit on
condensate pump, fan &
gas valve. Replace if
shorted & replace fuse.
YES
Replace PCB.
C
Fuse
© Baxi Heating UK Ltd 2011
D
51
* *
DRY-FIRE
Is the
system full of water ?
17.0
Lights
On
NO
Fill system with water and
bleed out all air.
YES
Is the
pump running ?
NO
Pump or Pump Wiring
fault.
YES
Unplug
5-way PCB
connector. Is
there continuity
between H
YES
Replace PCB.
H
Viewed from
Wire Entry end
NO
Disconnect
Flow Switch Inline
connector. With pump running is
there continuity across flow
switch ?
YES
Wires from inline
connector to PCB faulty.
NO
Remove
flow switch from boiler.
Is there a physical blockage to
the paddle within the
flow switch ?
YES
Remove Blockage.
52
© Baxi Heating UK Ltd 2011
NO
Is there a
blockage in the system ?
YES
Remove Blockage.
NO
Replace Flow Switch.
Fault Finding
17.0
Lights
On Off On
IGNITION LOCKOUT
Fault Finding
I
Is there
gas at gas valve inlet ?
NO
Gas Valve 5-way
Connector Plug
Check isolation valve and
gas supply.
J
YES
Remove
5-way connector
from gas valve. Is there 240
Vdc between I & J
during ignition ?
NO
Reset Lockout.
Is there gas flow
(check at meter) ?
YES
Replace Gas Valve.
NO
YES
Is
there at least
18mbar dynamic at gas valve
inlet ?
NO
Remove
the larger of the
two 6-way PCB connectors.
Is there continuity from I to L
& from J to K ?
Remove Gas Valve & check
inlet filter for blockage.
Otherwise incorrect gas supply
to boiler.
NO
Lead from PCB to Gas
Valve faulty.
YES
YES
Is
Condensate Trap
blocked or water on
terminals ?
Replace PCB.
YES
Clear blockage and dry
sensors.
K
L
NO
Is
Condensate Pump
reservoir full ?
YES
Check and if necessary
change over level switch
(see Section 13.5)
6-way Connector
NO
Is
spark or flame detection
probe damaged ?
YES
Replace spark or flame
detection probe and
gaskets.
NO
Is
spark gap between 3 and
4mm ?
NO
Set spark gap to 3.5mm.
YES
Is
wiring from PCB
to spark probe & flame
detection probe OK ?
NO
Rectify wiring.
© Baxi Heating UK Ltd 2011
YES
Is the
burner blocked or
damaged ?
NO
Replace PCB.
YES
Clean burner or replace as
necessary.
53
Lights
On Off onn
*
OVERHEAT LOCKOUT
Disconnect
black stat on flow pipe.
When flow < 60° C is there
continuity across stat ?
17.0
Fault Finding
NO
Replace Stat.
YES
Reconnect stat.
Disconnect fan stat.
When fan temp < 60° C
is there continuity
across stat ?
NO
Replace Stat.
YES
Reconnect stat.
Disconnect the larger of
the 6-way PCB connectors.
Is there continuity
across M ?
NO
YES
Disconnect
thermistor
(red sensor on flow pipe).
Is resistance between
0.5kë & 20kë ?
6-way Connector
NO
Replace thermistor.
YES
Is
combustion chamber
door seal damaged or not in
place ?
NO
Replace PCB.
54
© Baxi Heating UK Ltd 2011
M
Wiring from PCB to
thermostats faulty.
YES
Replace combustion
chamber door seal & trim
seal.
17.0
Lights
On on on
* *
FAN LOCKOUT
Fault Finding
NOTE: The fan is supplied with 325 Vdc.
Fan Fault Finding should only be carried out after the
boiler has been electrically isolated.
Fan
Connection
Unplug
3-way PCB connector
& unplug fan. Is there
continuity from N to O &
from P to Q ?
NO
Rectify wiring.
PCB
Connection
O
N
Q
P
YES
Unplug
the smaller of the
6-way PCB connector. Is there
continuity from R to S & from T
to U & from
V to W ?
YES
Replace fan.
© Baxi Heating UK Ltd 2011
Fan
Connection
PCB
Connection
NO
Rectify wiring.
R
T
V
S
U
W
Viewed from
Wire Entry end
55
Lights
On
On
*
THERMISTOR
Unplug
thermistor,
Is thermistor resistance between
0.5kë & 20kë ?
17.0
Fault Finding
NO
Replace thermistor.
D
YES
Plug in
thermistor, leave
8-way connector unplugged.
Is resistance at D between
0.5kë & 20kë ?
YES
Replace PCB.
56
© Baxi Heating UK Ltd 2011
NO
Wiring from PCB to
thermistor faulty.
Viewed from
Wire Entry end
17.0
Fault Finding
CONDENSATE PUMP
Lights
On Off On
Reset boiler
and add approx. 1 litre
tap water to the condensate
system via the flue or
sample point
Does the
pump motor run as
the condensate level
rises ?
Lights
* * On
NO
Mechanical fault
on float, linkage or switch.
Mechanical fault on pump
or impellor.
NO
YES
YES
NO
Condensate pump
outlet back check valve
blocked or seized shut.
NO
Is
condensate flow
rate at least 1.8 l/min and run
time less than 3
minutes ?
Condensate pipe
has high resistance - too long
or restricted, head greater than
3 metres.
Condensate pipe
blocked or kinked, or outlet
blocked or frozen
at drain.
Rectify fault, replacing pipe
if necessary.
If fault cannot be rectified
replace pump assembly.
NO
Is motor
resistance across C & D
approx. 40 ohms ?
No - replace pump
assembly
YES
YES
YES
5Vdc at A ?
No - replace PCB
5Vdc at B ? No - check wiring.
240V across C & D ?
No - replace level
switch
Go to diagram for
connections to check
If fault cannot be rectified
replace level switch or
pump assembly.
As the pump motor runs
does the condensate flow to
drain ?
Condensate pump level switch
activated for longer than 3
minutes - boiler locks out.
Boiler will try to relight 4 times
in 5 minutes.
Condensate pump over level
switch activated - pump
reservoir level too high
resulting in ignition lockout.
NO
Pump motor or
impellor worn - replace
pump assembly
YES
YES
Rectify fault, replacing or
re - routing pipe
if necessary.
Condensate Pump Assembly
Condensate
Over-Level Switch
Condensate Pump
Motor
N
Does
pump motor stop
as level in reservoir
falls ?
YES
Operation correct
© Baxi Heating UK Ltd 2011
NO
Mechanical fault on
float, linkage or level switch.
After 3 mins boiler
will lock out.
Condensate
Level Switch
L
gy
‘C’ ‘D’
‘B’
gy
YES
If fault cannot be rectified
replace level switch or
pump assembly.
PCB
‘A’
57
Failure to install and commission according to the manufacturer’s instructions and complete this Benchmark Commissioning Checklist will invalidate the warranty. This
does not affect the customer’s statutory rights.
If yes, and if required by the manufacturer, has a water scale reducer been fitted?
CONDENSING BOILERS ONLY
The condensate drain has been installed in accordance with the manufacturer’s instructions and/or BS5546/BS6798
Yes
If the condensate pipe terminates externally has the pipe diameter been increased and weatherproof insulation fitted?
Yes
58
Service Record
It is recommended that your heating system is serviced regularly and that the appropriate Service Interval Record is completed.
Service Provider
Before completing the appropriate Service Record below, please ensure you have carried out the service as described in the
manufacturer’s instructions.
Always use the manufacturer’s specified spare part when replacing controls.
Service 1
Date:
Service 2
Date:
Engineer Name:
Engineer Name:
Company Name:
Company Name:
Telephone No.
Telephone No.
Gas Safe Register No.
Gas Safe Register No.
Comments:
Comments:
Signature:
Signature:
Service 3
Date:
Service 4
Date:
Engineer Name:
Engineer Name:
Company Name:
Company Name:
Telephone No.
Telephone No.
Gas Safe Register No.
Gas Safe Register No.
Comments:
Comments:
Signature:
Signature:
Service 5
Date:
Service 6
Date:
Engineer Name:
Engineer Name:
Company Name:
Company Name:
Telephone No.
Telephone No.
Gas Safe Register No.
Operative ID No.
Comments:
Comments:
Signature:
Signature:
Service 7
Date:
Service 8
Date:
Engineer Name:
Engineer Name:
Company Name:
Company Name:
Telephone No.
Telephone No.
Gas Safe Register No.
Gas Safe Register No.
Comments:
Comments:
Signature:
Signature:
Service 9
Date:
Service 10
Date:
Engineer Name:
Engineer Name:
Company Name:
Company Name:
Telephone No.
Telephone No.
Gas Safe Register No.
Gas Safe Register No.
Comments:
Comments:
Signature:
Signature:
59
All descriptions and illustrations provided in this leaflet have been carefully
prepared but we reserve the right to make changes and improvements in
our products which may affect the accuracy of the information contained in
this leaflet. All goods are sold subject to our standard Conditions of Sale
which are available on request.
P O T T E RTON
A Trading Division of Baxi Heating UK Ltd (3879156)
Brooks House, Coventry Road, Warwick. CV34 4LL
After Sales Service 0844 871 1560 Technical Enquiries 0844 871 1555
Website www.potterton.co.uk
e&oe
© Baxi Heating UK Ltd 2011
Comp No. 720896601 (6/11)