Baxi System 100 HE Plus Release note

Please leave these instructions with the user
Baxi System 100 HE Plus
Wall Mounted Powered Flue Condensing
Gas Fired Central Heating Boiler
Installation & Servicing Instructions

2
Natural Gas
Baxi System 100 HE Plus
G.C.No1 075 3
The boiler meets the requirements of Statutory Instrument “
The Boiler (Efficiency) Regulations 1993 No3083” and is
deemed to meet the requirements of Directive 92/ 2/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.
Baxi is a BS-EN ISO 9001
Accredited Company
This product has an energy rating (A) on a scale of A to G.
For more information see www.boilers.org.uk. This is a certification mark.
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.
CORGI operate 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Benchmark Logbook is being withdrawn.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.
Potterton 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.

Installer Noti ication Guidelines
3
Choose Building
Regulations Notification
Route
Contact your relevant Local
Authority Building Control
(LABC) who will arrange
an inspection or contact
a government approved
inspector
LABC will record the data
and will issue a
certificate of compliance
CORGI will record the data and
will send a certificate of
compliance to the property
You must ensure that the
notification number issued by
CORGI is writen onto the
Benchmark Checklist
Scheme Members only
Call CORGI on: 0870 88 88 777
or log onto:
www.corgi-notify.com
within 10 days
If you notify via CORGI Scheme,
CORGI will then notify the
relevant Local Authority
Building Control Scheme
on member's behalf
Complete the
Benchmark Checklist
Install and Commission this
appliance to manufacturer's
instructions
Competent Person's
Self Certification Scheme Building Control

Legislation
Codes o Practice, most recent version should be used
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.
De inition o competence: A person who works for a CORGI 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”.
Li ting - This product should be lifted and handled by two people. For recommended
hand holds see section 8. . Stooping should be avoided and protective equipment worn
where necessary. Carrying & lifting equipment should be used as required, e.g. when
installing in a loft space.
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.
Baxi declare that no substances harm ul to health are
contained in the appliance or used during appliance
manu acture.
The appliance is suitable only or installation in GB and IE and
should be installed in accordance with the rules in orce, and
only used in a suitably ventilated location.
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 & 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 lushed and treated with
inhibitor (see section 6.2).
In GB the ollowing Codes o Practice apply:
Standard Scope
BS 6891 Gas Installation.
BS 55 6 Installation of hot water supplies for domestic
purposes.
BS 5 9 Forced circulation hot water systems.
BS 6798 Installation of gas fired hot water boilers.
BS 5 0 Part 1 Flues.
BS 5 0 Part 2 Ventilation.
BS 707 Expansion vessels and ancillary equipment for
sealed water systems.
BS 7593 Treatment of water in domestic hot water
central heating systems.
In IE the ollowing Codes o Practice apply:
Standard Scope
I.S. 813 Domestic Gas Installations.
The following BS standards give valuable additional information;
BS 55 6 Installation of hot water supplies for domestic
purposes.
BS 5 9 Forced circulation hot water systems.
BS 707 Expansion vessels and ancillary equipment for
sealed water systems.
BS 7593 Treatment of water in domestic hot water
central heating systems.
All CORGI registered installers carry a CORGI identification card and have a
registration number. You can check your installer is registered by telephoning
0870 012300 or writing to:-
1 Elmwood,
Chineham Business Park,
Crockford Lane,
Basingstoke. RG2 8WG
or check online at www.corgi-gas-safety.com

5
1.0 Introduction 6
2.0 General Layout 7
3.0 Appliance Operation 8
4.0 Technical Data 9
5.0 Dimensions and Fixings 10
6.0 System Details 11
7.0 Site Requirements 1
8.0 Installation 20
9.0 Electrical 26
10.0 Commissioning 28
11.0 Outer Case 29
12.0 Servicing 30
13.0 Changing Components 32
14.0 Short Parts List 1
15.0 Fault Finding 2
Benchmark Checklist 50
Section Page
Contents

1.0 Introduction
6
1.1 Description
1. The Baxi System 100 HE Plus is a gas fired room sealed fan
assisted condensing central heating system boiler.
2. The maximum output of the boiler is preset at 75,000
Btu/hr. The boiler will automatically adjust down to 30,000
Btu/hr according to the system load. If required, the output
can be set to 100,000 Btu/hr. Please refer to section 8.7.
3. It is designed for use on Natural Gas (G20).
. The boiler is suitable for sealed central heating and
domestic hot water systems.
5. 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).
6. The boiler data badge is positioned on the air box door
(Fig. 2).
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.
1.2 Important In ormation
Man-made mineral ibre
• 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.
NOTE: All illustrations show the PCB Connection
Cover removed unless otherwise shown.
Fig. 1
Data Badge
Air Box Door
Lower Door Panel
Fig. 2
Label

2.0 General Layout
7
2.1 Layout (Figs. 3, & 5)
1. Wall Plate
2. Flue Elbow
3. Heat Exchanger
. Burner
5. Air Box
6. Fan Protection Thermostat
7. Fan Assembly
8. Condensate Trap
9. Gas Tap
10. Gas / Air Ratio Valve
13. Flow Temperature Safety Thermostat - Black
1 . Flow Temperature Thermistor - Red
15. Flow Switch (dry fire protection)
16. Circulation Pump
17. Manual Air Vent
18. Pressure Relief Valve
19. Water Pressure Gauge
20. Expansion Vessel
1
2
3
4
5
6
7
8
9
10
13/14
17
16
Fig. 4
Fig. 3
Fig. 5
15
18
19
20
Fig. 6
2.2 Optional Extras
KIT PART No
FLUE EXTENSION KITS (110/70)
Flue Extension 0.25M 2 1692
Flue Extension 0.5M 2 169
Flue Extension 1M (Use two kits for 2M etc.) 2 1695
Flue Bend x 2 - 5° (Reduce overall length of flue
by 0.5m when fitting this bend) 2 1689
Flue Bend - 90° (Reduce overall length of flue
by 1m when fitting each bend) 2 1687
Horizontal Extended Flue (1.75M) 5111 57
VERTICAL FLUE (110/70)
Vertical Flue Terminal 2 2802
Vertical Flue Adaptor 5106888
VERTICAL FLUE (80/80)
Kit Boiler Connection Twin 2 2757

3.0 Appliance Operation
8
3.1
1. Switched Live To Boiler On: When the switched live
switches on if the flow temperature is less than the set
point then pump on occurs. When the switched live to
the boiler switches on if the flow temperature is greater
than the set point then pump overrun occurs.
2. Pump On: The pump is on while the fan, spark
generator and gas valve are off. 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.
3. Fan Pre-Purge: The pump and fan are on while the
spark generator and gas valve are off. After 5 seconds
ignition occurs.
. Ignition: The pump, 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 pump, 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 then pump
overrun occurs. If the TRVs all shut down then anti-
cycle occurs.
6. Pump Overrun: The pump is on while the fan, spark
generator and gas valve are off. After 1 minute anti-
cycle occurs.
7. Anti-cycle: The pump, fan, spark generator and gas
valve are off. After 3 minutes if the flow temperature is
less than the set point then pump on occurs. After 3
minutes if the flow temperature is greater than the set
point then pump overrun occurs.
8. Ignition Lockout: The pump, fan, spark generator and
gas valve are off. The boiler can only be reset by
manually using the reset button.
Switched Live
to Boiler On.
Flow
temperature less
than set point ?
YES
5 second
Fan Pre-Purge.
Flame Detected ?
Burner On.
Ignition
Lockout.
5 second
Ignition Period.
All TRVs
shut down ?
Ignition done and
5 attempts made ?
Ignition done
and less than 5
attempts made ?
Flow switch made ?
NO
YES
YES
YES
10 second
Pump On.
1 minute
Pump Overrun.
3 minute
Anti-cycle.
NO
YES
YES
NO

4.0 Technical Data
9
Appliance Category CAT I 2H
Horizontal
Flue Terminal Diameter 110mm
Dimensions Projection 150mm
Outercase Dimensions
Overall Height Inc Flue Elbow - 1000mm
Casing Height - 850mm
Casing Width - 90mm
Casing Depth - 320mm
Weights kg lb
Packaged Boiler Carton 53.6 118
Packaged Flue Kit 3.6 8.0
Weight Empty 8.6 107
Installation Lift Weight 0.2 88.6
Connections compression
Gas Supply - 1/2” BSPF
Central Heating Flow - 22mm
Central Heating Return - 22mm
Pressure Relief Discharge - 15mm
Condensate Drain - 1” BSP
Recommended System
Temperature Drop
Condensing 20°C 36°F
Heat Input Gross Max Min
kW 33.76 10.2
Btu/h 115,200 3 ,8 0
Heat Output
(Non Condensing 70° C Mean Water Temp)
Max Min
kW 30.18 9.1
Btu/h 102,980 31,180
Electrical Supply 230V~ 50Hz
(Appliance must be connected to an
earthed supply)
Power Consumption 200W
External Fuse Rating 3A
Internal Fuse Rating (BS 265)
Fuse 3.15 AT (PCB)
Inlet Pressure (Natural Gas)
Min 18.1 mbar
Max 22.5 mbar
(see Section 10.1)
Injector (Natural Gas)
6.3mm Diameter
Clearances
(For unventilated compartments see Section 7.2)
Both Sides 5mm Min
Above Casing 200mm Min
Below Casing 200mm Min
Front (For Servicing) 500mm Min
Front (In Operation) 5mm Min
Appliance Type C13 C33
NoxClass 5
Heat Output
(Condensing 0° C Mean Water Temp)
Max Min
kW 32.61 10.1
Btu/h 111,280 3 ,520
Water Content
litres 3.5
pints 6.2
Controls
boiler thermostat, safety thermostat,
flow switch, electronic flame sensing,
temperature protection thermostat &
condensate blockage sensor.
Central Heating Primary
Circuit Pressures
bar lb/in2
Safety Discharge 3 3.5
Max Operating 2.5 36.3
Min Operating 0.7 10.2
Recommend Operating 1-2 1 .5-29
Expansion Vessel - (For Central Heating only.
Integral with appliance)
bar lb/in2
Min Pre-charge Pressure 0.95 13.6
Nominal Pre-charge
Pressure 1 1 .5
litre gal
Max Capacity of
CH System 125 27.5
0
120 2 0 360 80
100
200
300
00
500
600
Pump Head (mbar)
Flow Rate (l/h)
Central Heating Circuit available Pump Head
0 600 720 8 0
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 have been certified by 0086.
SEDBUK Declaration For
Baxi System 100 HE Plus
The seasonal e iciency (SEDBUK) is 90.9 %
Max Gas Rate (Natural Gas)
(After 10 Mins)
Btu/hr 102,980 75,000
m3/h 2.95 2.36
ft3/h 10 .2 83.3
NOTE: The maximum output of the
boiler is factory set at 22.0kW (75,000
Btu/hr). This can be altered to 30.18kW
(102,980 Btu/hr)
- see section 8.7.
CO/CO2Ratio 0.001
Electrical Protection IPX2

5.0 Dimensions and Fixings
10
DIMENSIONS
A850mm
B320mm
C90mm
D125mm Ø Min.
E150mm
F125mm
SIDE FLUE (le t 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
360° Orientation
Tube Ø 110mm
DC
B
A
E
F
Y
3°
(1 in 20)
X
3°
(1 in 20)
Fig. 7
Fig. 8