Baxi Combi 130 HE User guide

Baxi Combi 130 HE
Gas Fired Wall Mounted Condensing
Combination Boiler
Installation and
Servicing Instructions
Please leave these instructions with the user

2
Baxi is one of the leading manufacturers of domestic
heating products in the UK.
Our first priority is to give a high quality service to our
customers. Quality is designed into every Baxi product
- products which fulfil the demands and needs of
customers, offering choice, efficiency and reliability.
To keep ahead of changing trends, we have made a
commitment to develop new ideas using the
latest technology - with the aim of continuing to make
the products that customers want to buy.
Everyone who works at Baxi has a commitment to
quality because we know that satisfied customers
mean continued success.
We hope you get a satisfactory service from Baxi. If
not, please let us know.
Natural Gas
Baxi Combi 130 HE
G.C.No47 075 04
Baxi is a BS-EN ISO 9001
Accredited Company
The boiler meets the requirements of Statutory Instrument
“ The Boiler (Efficiency) Regulations 1993 No3083” 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 0086.
Product/Production certified by:
Notified Body 0086.
Ref: 86-BL-647
For GB/IE only.
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
CORGI registered company and holding current
certificates in the relevant ACS modules, or valid ACoP
equivalents, is deemed competent.
In IE this must be carried out by a competent person as
stated in I.S. 813. "Domestic Gas Installations".
WARNING - 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.

3
1.0 Introduction 4
2.0 General Layout 5
3.0 Appliance Operation 6
4.0 Technical Data 7
5.0 Dimensions and Fixings 8
6.0 System Details 9
7.0 Site Requirements 12
8.0 Installation 16
9.0 Electrical 23
10.0 Commissioning the Boiler 25
11.0 Fitting the Outer Case 29
12.0 Servicing the Boiler 30
13.0 Changing Components 32
14.0 Short Parts List 43
15.0 Fault Finding 44
16.0 Operational Flow Chart 58
Section Page
Contents

Baxi declare that no substances harmful to
health are contained in the appliance or used
during appliance manufacture.
All systems must be thoroughly flushed and
treated with inhibitor (see Section 6.2).
This boiler is fitted with a flow switch
interlock that prevents it from firing when
the heating demand is satisfied.
1.1 Description
1. The Baxi Combi 130 HE is a fully automatic gas
fired wall mounted condensing combination boiler.
It is room sealed and fan assisted, and will serve
central heating and mains fed domestic hot water.
2. The boiler is preset to give a maximum output of
23.9 kW (81,500 Btu/h) for central heating and
39.0 kW (133,000 Btu/h) for hot water. In central
heating mode the boiler will automatically adjust
down to 10.6 kW (36,000 Btu/h) according to
system load.
3. It is designed for use on Natural Gas (G20) only.
4. Check the local supply conditions before
installation.
5. The boiler is suitable for use only on fully
pumped sealed heating systems. Priority is given
to domestic hot water.
6. A label giving details of the model, serial number
and Gas Council number is situated on the rear of
the lower door panel (Fig. 1).
7. The boiler data badge s positioned on the air
box door (Fig. 2).
8. The boiler is intended to be installed in
residential / commercial / light industrial E.M.C.
environments on a governed meter supply only.
9. The boiler must be installed with one of the
purpose designed flues such as the standard
horizontal flue kit, part no236921.
1.2 Important Information
Man-made mineral fibre
•Some component parts of this appliance
(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
man-made mineral fibre care must be exercised.
•If any irritation of the eyes or severe irritation of
the skin is experienced seek medical attention.
1.0 Introduction
4
Fig. 1
Fig. 2
“Benchmark” Log Book
As part of the industry-wide “Benchmark”initiative all Baxi boilers now
include an Installation, Commissioning and Service Record Log Book.
Please read the Log Book carefully and complete all sections relevant to
the appliance and installation. These include sections on the type of
controls employed, flushing the system, burner operating pressure etc.
The details of the Log Book will be required in the event of any warranty
work. Also, there is a section to be completed at each subsequent regular
service visit.
Lower Door Panel
Air Box Door
Data Badge

2.0 General Layout
5
2.1 Layout
1. Wallplate
2. Flue Elbow
3. Air Box
4. Heat Exchanger
5. Burner
6. Fan Protection Thermostat
7. Fan Assembly
8. DHW Plate Heat Exchanger
9. Three Way Valve
10. Facia Box
11. Water Pressure Gauge
12. Gas Tap
13. Circulation Pump
14. Pressure Relief Valve
15. Return Thermistor
16. Gas/Air Ratio Valve
17. Transformer
18. Flow Temperature Safety Thermostat
19. Flow Temperature Thermistor
20. Manual Air Vent
21. Automatic Air Vent
22. Flow Switch (Dry Fire Protection)
23. Condensate Trap
24. Expansion Vessel
2.2 Optional Extras
KIT PART No
FLUE EXTENSION KITS (110/70)
Horizontal Flue Kit 4M max
Flue Extension 0.25M 241692
Flue Extension 0.5M 241694
Flue Extension 1M (Use two kits for 2M etc.) 241695
Flue Bend - 45°(Reduce overall length of flue
by 0.5m when fitting this bend) 241689
Flue Bend - 90°(Reduce overall length of flue
by 1m when fitting this bend) 241687
VERTICAL FLUE KITS (110/70) 5M max
Vertical Flue Terminal 242802
Vertical Boiler Connection 242886
VERTICAL FLUE (80/80)
Kit Boiler Connection Twin 242757
CONTROL ACCESSORIES
Programmable Room Thermostat (Intellistat) 247495
Electro-Mechanical Timer 247498
Filling Loop Kit 247500
1
2
4
5
3
6
7
23
12
16
17
10
22
13
21
20
14
11
24
8
9
15
Expansion Vessel
removed for clarity
18
19

3.0 Appliance Operation
6
NOTE: All delay timers mentioned in 3.1 and 3.2
are overridden by domestic hot water demand.
3.1 Central Heating Mode
1. With a demand for heating, the pump circulates
water through the primary circuit. At a flow rate of
approximately 4.5 l/hr the central heating flow
switch operates, initiating the ignition sequence.
2. The main burner ignites at a low rate, then the
fan/gas valve and proportionator control the gas
rate to maintain the heating temperature measured
by the thermistor sensor.
3. When the flow temperature exceeds the set
temperature, a 1 minute pump overrun occurs
followed by 3 minutes anticycle. If the flow
temperature is low enough the burner will then
relight automatically otherwise pump overrun and
anticycle will occur again.
4. When the demand is satisfied the burner is
extinguished and the pump continues to run for a
period of 1 minute (Pump Overrun).
3.2 Domestic Hot Water Mode
1. Priority is given to the domestic hot water supply.
A demand at a tap or shower will override any
central heating requirement.
2. The flow of water will operate the DHW flow
switch and the 3-way valve will change position.
This will allow the pump to circulate the primary
water through the DHW plate heat exchanger.
3. The burner will light automatically and the
temperature of the domestic hot water is controlled
by the return thermistor.
4. When the domestic hot water demand ceases
the burner will extinguish and the diverter valve will
remain in the domestic hot water mode, unless
there is a demand for central heating.
3.3 Boiler Frost Protection
1. The boiler incorporates an integral frost
protection feature. It will operate in both summer
and winter modes. If the boiler temperature falls
below 8°C (± 5°) then the boiler will fire until a
temperature of 15°C (± 5°) is reached.
3.4 System Frost Protection Mode
1. The boiler incorporates an integral system frost
protection feature. This can be activated (see
section 10.4) if required. To monitor system
temperature the boiler will switch on the pump
every four hours in both summer and winter modes.
If water returned to the boiler is below 8°C (± 5°)
the boiler frost protection mode is automatically
activated. Due consideration should be taken to the
siting of the appliance when using this option. It
may be preferable to fit an external frost thermostat
to the system. In this instance the integral system
frost protection feature need not be activated.
3.5 Pump Protection
1. The control system continually monitors the time
since the pump last operated. This will result in the
pump being run for 1 minute if it has not run in the
last 24 hours to prevent seizure.

4.0 Technical Data
7
Flue Terminal Diameter 110mm
Dimensions Projection 150mm
Outercase Dimensions
Casing Height - 850mm
Overall Height Inc Flue
Elbow - 1000mm
Casing Width - 490mm
Casing Depth - 320mm
Clearances
Both Sides 5mm Min
Above Casing 200mm Min
Below Casing 200mm Min
Front 500mm Min (For Servicing)
Front 5mm Min (In Operation)
Weights kg lb
Packaged Boiler Carton 62.5 137.8
Packaged Flue Kit 3.8 8.4
Weight Empty 55.7 122.8
Installation Lift Weight 45.9 101.2
Central Heating Primary Circuit
Pressures
bar lb/in2
Safety Discharge 3 43.5
Max Operating 2.5 36.3
Min Operating 0.7 10.2
Recommend Operating 1-2 14.5-29
DHW Circuit bar lb/in2
Pressures
Max Operating 10 145
Min Operating 0.1 1.45
Min Operating Pressure
at 16 l/min 1.6 23.2
Flow Rates l/min gal/min
DHW Flow Rate
@ 30o C Rise 18.7 4.11
DHW Flow Rate
@ 35o C Rise 16 3.52
Min Working
DHW Flow Rate 3.5 0.77
Pump
Available Head See graph below
Expansion Vessel - (For Central Heating
only. Integral with appliance)
bar lb/in2
Min Pre-charge Pressure 0.95 13.8
Nominal Pre-charge
Pressure 1 14.5
litre gal
Max Capacity of
CH System 125 27.5
Primary Water Content
of Boiler (unpressurised) 1.5 0.33
Connections copper tails
Gas Supply - 22mm
Central Heating Flow - 22mm
Central Heating Return - 22mm
Cold Water Mains Inlet - 15mm
DHW Flow - 22mm
Pressure Relief Discharge - 15mm
Condensate Drain - 1”BSP
Recommended System
Temperature Drop
Normal 11°C
Condensing 20°C
Temperatures
C.H. Flow Temp (adjustable)
45°C to 82°C max (± 0.5°C)
D.H.W. Flow Temp (adjustable)
35°C to 55°C max (± 0.5°C)
dependent upon flow rate
Heat Input Gross DHW Max
kW 45.45
Btu/h 155,000
Heat Output CH
Non Condensing (70°C Mean Water temp)
Max Factory Set
kW 30.0 23.9
Btu/h 102,000 81,500
Condensing (40°C Mean Water temp)
Max Factory Set
kW 31.4 25.1
Btu/h 107,000 85,600
Electrical Supply 230V~ 50Hz
(Appliance must be connected to an
earthed supply)
Power Consumption 200W
External Fuse Rating 3A
Internal Fuse Rating 2AH
Appliance Category CAT I2H
Max Gas Rate (Natural Gas)
(After 10 Mins)
m3/h 4.2
ft3/h 148.3
Inlet Pressure (Natural Gas)
mbar 20
in wg 8
0
250 500 750 1000
0 0.9 1.8 2.75 3.7
1
2
3
4
5
6
Metre wg
l/h
gal/min
Pump - Available Head
0 1250
4.625
Appliance Type C13 C33
NOxClass 5
DHW Expansion Vessel
See Section 6.7 for information
Where flow rates are required in excess of 840 l/h please contact the Baxi
Technical Department for advice (Telephone number on the back cover).
The efficiency is 90.7%
This value is used in the UK Government’s
Standard Assessment Procedure (SAP) for
energy rating of dwellings. The test data from
which it has been calculated has been
certified by 0086.
SEDBUK Declaration For
Combi 130 HE
Heat Input Gross CH
Max Factory Set
kW 33.7 26.95
Btu/h 115,000 92,000
Electrical Protection IP 44

5.0 Dimensions and Fixings
8
Key To Support Bracket
1Domestic Hot Water Outlet 4Central Heating Flow
2Cold Water Inlet 5Central Heating Return
3Gas Supply 6Pressure Relief
Support Bracket
1 2 3 4 5
63 mm 62 mm 77 mm 74.5 mm
Tap Rail
Top View
of Tap Rail
C/L
6
50 mm
360°Orientation
Tube Ø110mm
DC
B
A
E
F
3°
(1 in 20)
DIMENSIONS
A850mm
B320mm
C490mm
D125mm ØMin.
E150mm
F136mm
SIDE FLUE (left and right)
For every 1m of horizontal flue
length, the clearance above the
top of the flue elbow should be
55mm to incorporate the 3°
(1 in 20) fall in the flue from the
terminal to the elbow.
The 3°(1 in 20) fall provided
by the elbow is to allow
condensate to run back to the
boiler, for disposal through the
condensate discharge pipe.
Flue length (Y)
up to 1m
1m - 2m
2m - 3m
Clearance (X)
55mm
110mm
165mm
Y
3°
(1 in 20)
X

6.0 System Details
9
6.1 Information
In GB it is necessary to comply with the Water
Supply (Water Fittings) Regulations 1999 (or for
Scotland, The Water Byelaws 2000, Scotland).
The Baxi Combi 130 HE Combination Boiler is an
Approved Product under the Water Regulations.
To comply with the Water Regulations your attention
is drawn to The Water Regulations Advisory Service
(WRAS) which gives full details of the requirements.
In IE the requirements given in the current edition of
I.S. 813 “Domestic Gas Installations”and the current
Building Regulations must be followed.
6.2 Central Heating Circuit
1. The appliance is suitable for fully pumped SEALED
SYSTEMS ONLY.
This boiler is fitted with a flow switch interlock that
prevents it from firing when the heating demand is
satisfied.
The boiler is designed so that it will heat the house to
the desired room temperature as quickly as possible
by running at the maximum radiator temperature of
82°C.
Once this room temperature is achieved the boiler will
then reduce the radiator temperature to as low a level
as possible, while still achieving the desired room
temperature, thereby giving the most efficient use of
gas and the most comfortable room temperature
possible.
The boiler will be able to achieve this performance if a
room thermostat is fitted or with a fully TRV’d
system without a bypass. If the system is fully
TRV’d with a bypass then this feature will not be
available, in this case the radiator temperature can be
reduced to provide more efficient operation. (see User
instructions).
•If the hot water delivery is greater than 18
litres/minute the flow regulator must be fitted to the
Domestic Hot Water inlet (A pint milk bottle will fill in
under 2 seconds).
•If the boiler is to be uprated to 100,000 Btu/hr CH
output, an extra standard pump will be required and the
commissioning procedure will take approximately 30
minutes longer.
•The condensate drain and pipes must be free from
leaks.
•Any timer and thermostat should be removed before
installing optional Intellistat as it will override their
operation.
•Treatment of Water Circulating Systems
All water circulating systems will be subject to corrosion
unless an appropriate water treatment is applied.
Without treatment the efficiency of the system will
deteriorate as corrosion sludge accumulates within the
system, risking damage to pump and valves, boiler
noise and circulation problems.
For optimum performance after installation this boiler
and its associated central heating system must be
flushed in accordance with the guidelines given in BS
7593:1992. “Treatment of water in domestic hot water
central heating systems”.
This must involve the use of a proprietary cleanser, such
as BetzDearborn Sentinel X300 or X400, Fernox
Superfloc or Salamander System Cleanser. Full
instructions are supplied with the products, but for
immediate information please contact BetzDearborn
(0044 (0)151 420 9563), Fernox (0044 (0)1799 550 811)
or Salamander (0044 (0)121 378 0952) directly.
For long term protection against corrosion and scale,
after flushing it is necessary that an inhibitor such as
BetzDearborn Sentinel X100, Fernox MB-1 or Copal or
Salamander System Inhibitor is dosed in accordance
with the guidelines given in BS 7593:1992.
Failure to flush and add inhibitor to the system will
invalidate the appliance warranty.

6.0 System Details
10
6.3 System Control
1. The boiler is designed for use in a heating
system that incorporates external controls, i.e. a
minimum of a timer device.
2. Suitable timer kits are available as optional
extras.
3. For optimum operating conditions and maximum
economy the fitting of the Baxi Intellistat, is
recommended.
6.4 System Filling and Pressurising
1. 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.
2. The filling method adopted must be in
accordance with all relevant water supply
regulations and use approved equipment.
3. 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".
4. The sealed primary circuits may be filled or
replenished by means of a temporary connection
between the 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.
5. To aid removal of air from the system whilst
filling, move the diverter valve to the CH position by
using the installer parameters (see Section 10.5).
6.5 Expansion Vessel - CH only(Fig. 4)
1. The appliance expansion vessel is pre-charged
to 1 bar (10 lb/in2). Therefore, the minimum cold fill
pressure is 1 bar. The vessel is suitable for correct
operation for system capacities up to 125 litres
(27.5gal). For greater system capacities an
additional expansion vessel must be fitted. For GB
refer to BS 7074 Pt 1. For IE, the current edition of
I.S. 813 “Domestic Gas Installations”.
6.6 Pressure Relief Valve (Fig. 4 & 5)
1. The pressure relief valve is set at 3 bar,
therefore all pipework, fittings, etc. should be
suitable for pressures in excess of 3 bar.
2. The pressure relief discharge pipe should be not
less than 15mm dia, run continuously downward,
and discharge outside the building, preferably over
a drain. It should be routed in such a manner that
no hazard occurs to occupants or causes damage
to wiring or electrical components. The end of the
pipe should terminate facing down and towards the
wall.
3. The discharge must not be above a window,
entrance or other public access. Consideration
must be given to the possibility that boiling
water/steam could discharge from the pipe.
Fig. 3
Fig. 5
Stop
Valve
Double
Check
Valve
DHW
Mains
Inlet
CH
Return
Temporary
Hose
Discharge Pipe
Pressure Relief
Valve
Expansion Vessel
removed for clarity
Fig. 4
Expansion Vessel
Stop
Valve

6.0 System Details
11
6.7 Domestic Hot Water Circuit
1. All DHW circuits, connections, fittings, etc.
should be fully in accordance with relevant
standards and water supply regulations.
2.Your attention is drawn to:
for GB: Guidance G17 to G24 and
recommendation R17 to R24 of the Water
Regulations Guide.
for IE: the current edition of I.S. 813. "Domestic
Gas Installations".
Sealed primary circuits and/or secondary hot
water systems shall incorporate a means for
accommodating the thermal expansion of water
to prevent any discharge from the circuit and/or
system, except in an emergency situation.
3.When the system includes any device which
prevents water expanding back towards the
supply (check valve, loose jumpered stopcock,
water meter, water treatment device), then an
expansion vessel must be fitted (e.g. Zilmet
l6Oml, R1/2 l5 bar). A check valve must also be
fitted on the supply as shown, to ensure efficient
operation and also to prevent the reverse flow of
hot water into the supply pipe.
4. If the hot water expansion is not provided for,
then high pressures can develop which may
result in damage to fittings and devices on the
system.
5. The boiler’s maximum working mains pressure
is 10 bar (150 lb/in2), therefore all pipework,
connections, fittings, etc. should be suitable for
pressures in excess of 10 bar. A pressure
reducing valve must be fitted for pressures in
excess of 10 bar. The manufacturer of any outlet
fittings, such as a shower valve, may require a
lower maximum pressure. The pressure reduction
must take account of all fittings connected to the
DHW system.
6.8 Showers
1. If a shower control is supplied from the
appliance it should be of the thermostatic or
pressure balanced type. Thermostatic type
shower valves provide the best comfort and
guard against water at too high a temperature.
Existing controls may not be suitable - refer to the
shower valve manufacturer.
6.9 Hard Water Areas
1. If the area of the installation is recognised as a
HARD WATER AREA then a suitable device
should be fitted to treat the mains water supply to
the boiler.
Key
1 Expansion Vessel
2 Flow Thermostat
3 Flow Thermistor
4 Flow Switch
5 Primary Heat Exchanger
6 Gas Valve
7 DHW Plate Heat Exchanger
8 DHW Flow
9 DHW Mains Inlet
10 Flow Regulator
11 DHW Flow Switch
Boiler
Other Tap
Outlets
Expansion
Vessel
To Hot
Taps
Check
Valve
Pressure
Reducer Valve
Stop Tap
V
M
12 Gas Inlet
13 Filling Loop
14 CH Flow Valve
15 Filter
16 CH Return Valve
17 Pressure Gauge
18 Pump
19 Pressure Relief Valve
20 Return Thermistor
21 3 Way Valve
1
5
432
20
21
7
18
17
14
129
11
16
19
13
10 15
6
815

7.0 Site Requirements
12
7.1 Information
1. In GB, the installation must be carried out by a
CORGI Registered Installer. It must be carried out in
accordance with the relevant requirements of the Gas
Safety (Installation and 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 and
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.
7.2 Codes of Practice
In GB the following Codes of Practice apply:
Standard Scope
BS 6891 Gas Installation.
BS 5546 Installation of hot water Supplies for domestic
purposes.
BS 5449 Forced circulation hot water systems.
BS 6798 Installation of gas fired hot water boilers.
BS 5440 Pt. 1 Flues.
BS 5440 Pt. 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
I.S. 813 Domestic gas Installations
The following BS standards give valuable additional information;
BS 5546 Installation of hot water Supplies for domestic
purposes.
BS 5449 Forced circulation hot water systems.
BS 7074 Expansion vessels and ancillary equipment for
sealed water systems.
BS 7593 Treatment of water in domestic hot water central
heating systems.
7.3 Clearances (Fig. 6 & 7)
1. A flat vertical area is required for the installation of the
boiler.
2. 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.
7.4 Location
1. The boiler may be fitted to any suitable non-
flammable wall with the flue passing through an outside
wall or roof and discharging to atmosphere in a position
permitting satisfactory removal of combustion products
and providing an adequate air supply. The boiler should
be fitted within the building unless otherwise protected
by a suitable enclosure i.e. garage or outhouse. (The
boiler may be fitted inside a cupboard - see Section
7.5).
2. If the boiler is sited in an unheated enclosure then it is
recommended to leave the boiler in either the summer
or winter mode to give frost protection.
200mm
850mm
490mm
200mm
5mm Min
5mm Min
5mm
500mm
For Servicing
Purposes
Fig. 6
Fig. 7 In Operation
3°
(1 in 20)
320mm

7.0 Site Requirements
13
3. If the boiler is fitted in a room containing a bath
or shower 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 IS 813 and the current ETCI
rules.
4. If the boiler is to be fitted into a building of timber
frame construction then reference must be made to
the Institution of Gas Engineers document
IGE/UP/7.
7.5 Ventilation of Compartments
1. Where the appliance is installed in a cupboard or
compartment, no air vents are required. The
appliance will run sufficiently cool without extra
ventilation.
Minimum Cupboard Size (inside dimensions)
Height - 1250mm Width - 590mm Depth - 400mm
NOTE: The ventilation label on the front of the
outer case MUST NOT BE REMOVED when the
appliance is installed in a compartment or
cupboard.
2. BS 5440: Part 2 Clause 4.2 refers to room sealed
appliances installed in compartments.
7.6 Gas Supply
1. 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”.
2. The connection to the appliance is a 22mm
copper tail located at the rear of the gas service
cock (Fig. 8).
3. Ensure that the pipework from the meter to the
appliance is of adequate size. Do not use pipes of a
smaller diameter than the boiler gas connection
(22mm).
7.7 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.
NOTE: The method of connection to the
electricity supply must facilitate complete
electrical isolation of the appliance.
Connection must be via a fused double-pole
isolator with a contact separation of at least
3mm in all poles and servicing the boiler and
system controls only.
Fig. 8
Gas Service
Cock

7.0 Site Requirements
14
N
I
I
G
F
M
I
AAF
H
J,K
D
E
H
Likely flue positions requiring
a flue terminal guard
C
RA
I
J,K
I
L
S
B
7.8 Flue
NOTE: Due to the nature 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. Take into consideration the effect the plume of
vapour may have on neighbours when siting the
flue.
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.
5. For installation of the flue into an internal
corner at the 25mm dimension the flue deflector
kit (part no. 248167) must be fitted.
6. * Reduction to the boundary is possible down
to 25mm but the flue deflector kit (part no.
248167) must be fitted.
7. For fitting under low sofits and eaves it is
acceptable for the flue to project upto 500mm
from the face of the wall to the inside of the air
intake. This can be painted if required using a
suitable external paint.
8. If a terminal is less than 2 metres (783/4in)
above a balcony, above ground or above a flat
roof to which people have access, then a suitable
terminal guard must be provided.
Fig. 10
Fig. 9
300 min
Terminal
Assembly
Top View Rear Flue
Property Boundary Line
NOTE: The distance from a fanned draught appliance
terminal installed parallel to a boundary may not be less
than 300mm in accordance with the diagram below
Table. 2
Terminal Position with Minimum Distance (Fig. 10) (mm)
AaDirectly below an opening, air brick, opening
windows, etc. 300
BaAbove an opening, air brick, opening window etc. 300
CaHorizontally 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
H From an internal (i) or external (ii) corner. (i) 25 (ii) 115
I Above ground, roof or balcony level. 300
J From a surface 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 From adjacent wall to flue (vertical only). 300
S From an adjacent opening window (vertical only). 1000
aIn 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.
*

7.0 Site Requirements
15
7.9 Flue Dimensions
See Section 1.2. The standard horizontal flue kit
allows for flue lengths between 270mm and
800mm from elbow to terminal (Fig. 11).
The maximum permissible equivalent flue
length is: 4 metres horizontal (Fig. 12).
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.
7.10 Terminal Guard (Fig. 13)
1. When codes of practice dictate the use of
terminal guards, they can be obtained from most
Plumbers’and Builders’Merchants.
2. There must be a clearance of at least 50mm
between any part of the terminal and the guard.
3. When ordering a terminal guard, quote the
appliance name and model number.
4. The flue terminal guard should be positioned
centrally over the terminal and fixed as
illustrated.
Fig. 11
Fig. 12
Pictorial examples of flue runs where EQUIVALENT flue length equals 4m
Fig. 13
270mm 800mm
0.5m
1m
1m
0.5m

7.0 Site Requirement
16
Key Accessory Size Baxi Code
Number
Concentric Flue System 110mm diameter
A Straight extension kit 1000mm 241695
500mm 241694
250mm 241692
B Bend kit 93°241687
C Bend kit (pair) 45°241689
D Horizontal flue terminal 243013BAX
Clamp 110mm 243014BAX
Twin Flue System 80mm diameter
E Straight extension kit 1000mm 238690
500mm 238692
250mm 238694
F Bend kit 90°246139
G Bend kit (pair) 45°246138
Universal Vertical Flue Kits
H Twin flue adaptor kit 242757
J Vertical flue terminal 242802
K Universal roof tile 25°/50°243015
L Roof cover plate kit 243131
M Flat roof flashing 243016BAX
N Boiler connection vertical concentric 242886
Clamp 80mm 238684
7.11 Flue options
Concentric
The maximum equivalent lengths are 4m
(horizontal) or 5m (vertical). There lengths exclude
the standard elbow and flue/terminal assembly
(horizontal) and terminal assembly (vertical).
Twin Flue
The total maximum equivalent flue length is 40m.
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: 45ºbend 0.5 m
93ºbend 1.0 m
Twin Flue Pipe: 45ºbend (air duct) 1.3 m
45ºbend (flue duct) 2.6 m
90ºbend (air duct) 4.8 m
90ºbend (flue duct) 9.6 m
Detailed examples of equivalent flue length
calculation are given in the Installation Guidance
Notes for each flue system type.
(Documents 243501 and 243502 for concentric and
twin pipe respectively).
Standard Flue
C
B
A
D
J
K
L
C
H
E
H
M
GF
N

8.0 Installation
17
Check Site Requirements (section 7.0) before
commencing.
Fitting an Extra Pump
To extract 100,000 Btu/hr from the boiler in
central heating mode an extra pump will need to
be fitted to increase flow. It must be fitted in
parallel to the existing pump and in the return
pipe. See Pages 22 & 23 for wiring details.
8.1 Initial Preparation
The gas supply, gas type and pressure must be
checked for suitability before connection (see
Section 7.6).
NOTE: If the boiler is to be pre-plumbed, follow
both these instructions and those on the boiler
pack.
1. Remove the fixing template (Fig. 14) from the
fixing carton.
2. Position the template on the wall ensuring it is
level both horizontally and vertically.
3. Mark the position of the top centre hole for the
wallplate.
4. Mark the condensate discharge pipe area.
5. Mark the centre of the flue hole (rear exit). For
side exit, mark as shown. If required, mark the
position of the gas and water pipes. Remove the
template.
6. Cut the hole for the flue (minimum diameter
125mm) (see table opposite for wall thickness flue
diameters).
7. Drill and plug the wall as previously marked.
Secure the wallplate to the wall by the top centre
hole.
8. Ensuring the wallplate is level both horizontally
and vertically, drill and plug the remaining 4 securing
positions at the top and bottom through the wallplate.
Utilising the slots available ensure the wallplate is
square and secure to the wall.
9. Connect the gas,water and the pressure relief
discharge pipes to the valves on the support bracket
using the copper tails supplied. Ensure the sealing
washers are fitted correctly to the water connections.
10. Loosely route the condensate discharge pipe to
the area previously marked.
8.2 Flushing
1. Insert a tube into the valve outlet furthest from the
filling loop (Fig. 15).
2. Flush thoroughly (see System Details, Section
6.0).
Wall Thickness
up to 227mm
up to 750mm
up to 1200mm
Flue Hole ø
125mm core drill
150mm core drill
175mm core drill
Plastic Flushing Tube
Fig. 15
Fig. 14
Centre for dia 125mm (5") hole
for wall thickness upto 227mm (9")
Centre for dia 150mm (6") hole
for wall thickness 227mm (9")
to 750mm (30")
Note: For each 1m of horizontal flue add 55mm of clearance
Centre line of flue at 3
Centre line of flue at 3
General area for
electrical supply
5mm Minimum clearance each side
Appliance outline
Gas Supply Central Heating
Return
Central Heating
Flow
Cold Water
Inlet
Domestic Hot
Water Out
Condensate
Drain
Pressure
Relief
Combi 130 HE
TEMPLATE
Boiler
Centre Line
200mm Minimum
Clearance
200mm
Minimum
Clearance
37.5mm Offset
The symbols for each connection are on the support bracket.

8.0 Installation
18
Fig. 16
Fig. 17
Outer Case
Fixing Screw
Lower Door
Panel
Service Guidance Note
Label on inside of panel
8.3 Preparing The Boiler
1. Remove the outer carton.
2. Hinge up the lower door panel (Fig. 16).
3. Remove the outer case fixing screws (Fig. 16).
Slide the outercase upwards to disengage the
hooks on the backplate and remove (Fig. 17).
NOTE: Service Guidance Note Label is fitted
to the inside of the outercase (Fig. 17).
4. Remove the sealing plugs from the copper
bends.
5. Stand the boiler on its base by using the rear
lower edge as a pivot.
NOTE: A small amount of water may drain from
the boiler in the upright position.
Baxi declare that no substances harmful to
health are contained in the appliance or
used during construction of the appliance.

8.0 Installation
19
8.4 Fitting The Boiler (Fig. 18)
1. Remove the tape from the tap rail on the
support bracket.
2. Lift the boiler using the lower edges of the
combustion box.
3. Lift the boiler over the support bracket and
engage onto the top hooks.
4. To gain access to the connections between
boiler and valves, release the facia securing
screws (1/4turn) and hinge down the facia box.
5. Make the connections in the following
sequence:
a) Gas connection first to centralise the boiler. The
gas sealing washer is an integral part of the
gas tap.
The Combi 130 HE is designed to operate
under nominal water supply conditions. If the
hot water delivery is greater than 18
litres/minute the flow regulator must be fitted to
the Domestic Hot Water inlet (A pint milk bottle
must fill in under 2 seconds).
b) Domestic hot water cold feed, if necessary fit
the water flow regulator ensuring that it is fitted the
correct way round (Fig. 20). NOTE: Ensure water
inlet filter is fitted.
c) The remaining connections ensuring the fibre
sealing washers are inserted between the valve
outlet face and the flange on the copper pipes of
the water circuit and pressure relief connections
(Fig. 20).
6. Tighten the connections in the sequence listed
above.
8.5 Condensate Drain
1. Connect the condensate drain using the 1”BSP
nut and seal supplied. (see section 7.8.)
Ensure the discharge of condensate complies
with any national or local regulations in force (see
British Gas “Guidance Notes for the Installation
of Domestic Gas Condensing Boilers”.
2. The condensate outlet terminates in a 1”BSP
nut and seal for the connection of 21.5mm (3/4in)
plastic overflow pipe which should generally
discharge internally into the household drainage
system. If this is not possible, discharge into an
outside drain is acceptable.
3. The pipe should run internally as much as
possible and with a 10°(1 in 6) fall to dispose of
condensate quickly to avoid freezing.
Top Hooks
Support Bracket
Facia Box
Facia Securing
Screws
Gas Connection
Tap Rail
Fig. 18
Fig. 20
FLUE PRODUCTS EXHAUST
Tap Rail
Central Heating
Return Filter
Fig. 19
Fibre Sealing
Washer
Flow Regulator
Water Inlet Filter
Hot Water
Outlet
Cold Water
Inlet
Central
Heating Flow
Central
Heating Return Pressure Relief

8.0 Installation
20
8.6 Fitting The Flue
Before fitting the flue, check the condensate
drain integrity (see section 8.5).
IMPORTANT: The flue should always be
installed with a 3°(1 in 20) fall from terminal to
elbow, to allow condensate to run back to the
boiler.
HORIZONTAL FLUE
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 - 614mm
Side Flue: maximum wall thickness - Right Hand 462mm,
Left Hand 537mm when installed with minimum side
clearances of 5mm.
2. For rear exit - measure the wall thickness
(Fig. 21) and to this dimension add 226mm. This
dimension to be known as (X).
i.e. (X) = wall thickness + 226mm
3. Take the flue and mark off (X) from the
terminal end as indicated in the diagram (Fig. 22).
Check your dimensions.
The flue tubes are fixed together. Cut through
both tubes whilst resting the flue on the semi-
circular packing pieces. Deburr both tube ends.
4. For left hand exit - measure the distance from
the edge of the support bracket to the inner face
of the wall (Fig. 21) and to this dimension add the
wall thickness + 293mm. This dimension to be
known as (Y).
i.e. (Y) = support bracket to wall + wall thickness
+ 293mm
5. Take the flue and mark off (Y) from the
terminal end as indicated (Fig. 22).
6. For right hand exit - measure the distance
from the edge of the support bracket to the inner
face of the wall and to this dimension add the wall
thickness + 368mm. This dimension to be known
as (Z).
i.e. (Z) = support bracket to wall + wall thickness
+ 368mm
7. Take the flue and mark off (Z) from the terminal
end as indicated (Fig. 22).
Check your dimensions.
The flue tubes are fixed together. Cut through
both tubes whilst resting the flue on the semi-
circular packing pieces. Deburr both tube ends.
IMPORTANT: Check all measurements before
cutting. When cutting ensure the cut does not
interfere with the inner flue support bracket
(Fig. 23).
360°Orientation
Inner Flue Support Bracket
Wall Thickness
YEdge of Support Bracket
to Wall
Wall Thickness
(Y) = Left Exit
(Z) = Right Exit
(X) = Rear Exit
Flue
Waste
Fig. 21
Fig. 22
Fig. 23
3°
(1 in 20)
X
Support Bracket