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