Baxi Solo 3 30 PF User guide

Baxi Solo 3 PF
Wall Mounted Powered Flue
Gas Fired Central Heating Unit
Installation and
Servicing Instructions
Please leave these instructions with the user

2
Baxi UK Limited 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 built 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 Solo 3 30 PF
G.C.No. 41 075 04
Baxi Solo 3 40 PF
G.C.No. 41 075 05
Baxi Solo 3 50 PF
G.C.No. 41 075 06
Baxi Solo 3 60 PF
G.C.No. 41 075 07
Baxi Solo 3 70 PF
G.C.No. 41 075 08
Baxi Solo 3 80 PF
G.C.No. 41 075 09
Baxi is a BS-EN ISO 9001
Accredited Company
The boiler meets requirements of Statutory
Instrument “The Boiler (Efficiency) Regulations
1993 No3083” and is deemed to meet the
requirements of Directive 92/42/EEC on the
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.
For GB / IE only.

3
1.0Introduction 4
2.0Technical Data 5
3.0System Details 7
4.0Site Requirement 10
5.0Installation 14
6.0 Commissioning the Appliance 32
7.0 Fitting the Outercase 34
8.0 Overheat Cut-Off Device 35
9.0Annual Servicing 36
10.0Changing Components 38
11.0Fault Finding 42
12.0Short Parts List 44
13.0Notes 45
Section Page
Contents

1.0 Introduction
41
STANDARD
B.S. 6891
B.S. 5546
B.S. 5449
B.S. 6798
B.S. 5440: Pt 1
B.S. 5440: Pt 2
B.S. 7593
B.S. 4814
B.S. 6283
SCOPE
Gas Installation.
Installation of hot water supplies for
domestic purposes.
Forced circulation hot water systems.
Installation of gas fired hot water
boilers.
Flues.
Ventilation.
Water Treatment.
Expansion vessels for hot water
systems.
Safety and control devices for use in
hot water systems.
HEAT OUTPUT Q
Model Min Max
30 5.86kW (20,000 Btu/h) 8.79kW (30,000 Btu/h)
40 9.09kW (31,000 Btu/h) 11.72kW (40,000 Btu/h)
50 12.02kW (41,000 Btu/h) 14.65kW (50,000 Btu/h)
60 14.95kW (51,000 Btu/h) 17.58kW (60,000 Btu/h)
70 17.88kW (61,000 Btu/h) 20.5kW (70,000 Btu/h)
80 20.8kW (71,000 Btu/h) 23.45kW (80,000 Btu/h)
B.S. Codes of Practice, most recent
version should be used
1.1 Description
1. The Baxi Solo 3 PF is a gas fired room sealed
fan assisted central heating boiler with range rated
outputs as shown in the table below
2. Each appliance is preset at a MID RANGE heat
input rating and is designed for use on NATURAL
GAS only.
3. All boilers are suitable for fully pumped open
vented central heating and domestic hot water
systems and sealed systems.
4. The appliance data badge is fitted to the
combustion box door.
1.2 Installation
1. The appliance is suitable for installation only in
G.B. and I.E. and should be installed in
accordance with the rules in force. For Ireland
install in accordance with I.S.813 “INSTALLATION OF
GAS APPLIANCES”. The installation must be carried
out by a CORGI Registered Installer or other
competent person and be in accordance with the
relevant requirements of the current GAS SAFETY
(Installation and Use) REGULATIONS, the BUILDING
REGULATIONS (Scotland) (Consolidation), the
LOCAL BUILDING REGULATIONS, the CURRENT I.E.E.
WIRING REGULATIONS and the bye laws of the Local
Water Undertaking. Where no specific instructions
are given, reference should be made to the
relevant current BRITISH STANDARD CODES
OF PRACTICE.
2. All systems must be thoroughly flushed and
treated with inhibitor (see Section 3.1).
1.3 Important Information
Man-Made Mineral Fibre
a) Some component parts of this appliance
(insulation pads, gaskets and rope seals) are
manufactured from man-made mineral fibre.
b) Prolonged or excessive exposure to this
material may result in some irritation to the eyes,
skin or respiratory tract.
c) It is advisable to wear gloves when handling
these items.
d) 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.
e) Always thoroughly wash hands after
installation, servicing or changing components.
f) When disposing of any items manufactured from
man-made mineral fibre care must be exercised.
g) If any irritation of the eyes or severe irritation of
the skin is experienced seek medical attention.
IMPORTANT: State of adjustment - Check that
the state of adjustment given on the data plate
is compatible with local supply conditions.
“Benchmark”Log Book
As part of the industry-wide “Benchmark”intiative 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.

2.0 Technical Data
15
Model 30 40 50 60 70 80
P Heat Output (Max) kW 8.79 11.72 14.65 17.58 20.5 23.45
Btu/h 30,000 40,000 50,000 60,000 70,000 80,000
P Heat Output (Min) kW 5.86 9.09 12.02 14.95 17.88 20.8
Btu/h 20,000 31,000 41,000 51,000 61,000 71,000
Q Heat Input (Max) kW 10.99 14.65 18.32 21.98 25.64 29.31
Btu/h 37,500 50,000 62,500 75,000 87,500 100,000
Q Heat Input (Min) kW 7.33 11.36 15.02 18.68 22.35 26.01
Btu/h 25,000 38,750 51,250 63,750 76,250 88,750
Burner Pressure (Max) mbar 16.0 ±0.5 16.0 ±0.5 16.0 ±0.5 16.0 ±0.5 16.0 ±0.5 16.0 ±0.5
in wg 6.4 ±0.2 6.4 ±0.2 6.4 ±0.2 6.4 ±0.2 6.4 ±0.2 6.4 ±0.2
Burner Pressure (Min) mbar 8.0 ±0.5 10.0 ±0.5 11.5 ±0.5 11.5 ±0.5 12.1 ±0.5 11.5 ±0.5
in wg 3.2 ±0.2 4.0 ±0.2 4.4 ±0.2 4.4 ±0.2 4.8 ±0.2 4.4 ±0.2
Gas Rate CV 38mj/m31.04m3/h 1.39m3/h 1.74m3/h 2.08m3/h 2.43m3/h 2.78m3/h
(after 10 mins) 36.86ft3/h 49.0ft3/h 61.3ft3/h 73.5ft3/h 86.75ft3/h 98.1ft3/h
Lifting Weight kg 23.1 23.1 23.1 32.2 32.2 32.2
lbs 51 51 51 71 71 71
Water Content litres 1.1 1.1 1.1 1.6 1.6 1.6
pints 1.9 1.9 1.9 2.8 2.8 2.8
Outercase Height 600mm 600mm 600mm 600mm 600mm 600mm
Dimensions Width 350mm 350mm 350mm 462mm 462mm 462mm
Depth 287mm 287mm 287mm 287mm 287mm 287mm
Flue Terminal Diameter 100mm
Dimensions Depth 70mm
Static Head Max 30 metres (100 ft)
Min 1 metre (3.25 ft)
Connections Flow 22mm Cu tail
Return 22mm Cu elbow
Heat Exchanger Cast iron monobloc
Low Head Min 0.2m (8 in)
System Design fully pumped open vented and sealed systems
Gas Connection RC1/2(1/2in BSPT)
Electrical Supply 230V ~ 50Hz fused 5A - 90W
Controls boiler thermostat, intermittent pilot & electronic flame sensing,
timed pump over-run, frost protection thermostat
Internal Fuse 4AF 250V to BS4256 situated on control board

2.0 Technical Data
6
25
75 121
392
439
442
268
144144
4
107 Dia
without
internal
fitting
117 Dia
with
internal
fitting
Centre of
Gas Connection
8 Slots
20 x 6
Layout of Fixing Points
30, 40 and 50 PF models
25
75 121
392
439
442
380
196196
52
107 Dia
without
internal
fitting
117 Dia
with
internal
fitting
Centre of
Gas Connection
8 Slots
20 x 6
Layout of Fixing Points
60, 70 and 80 PF models
(4) 10
(8) 20
(16) 40
(24) 60
(12) 30
(20) 50
(28) 70
(32) 80
(36) 90
(40) 100
(44) 110
(48) 120
2 4 6 8 1012141618 2022
Water Flow Rate litres / min
Pressure Drop mbar (in wg)
242628 30
(52) 130
(4) 10
(8) 20
(16) 40
(24) 60
(12) 30
(20) 50
(28) 70
(32) 80
(36) 90
(40) 100
(44) 110
(48) 120
2 4 6 8 1012141618 2022
Water Flow Rate litres / min
Pressure Drop mbar (in wg)
242628 30
(52) 130
30, 40 and 50 PF models 60, 70 and 80 PF models
Templates
Hydraulic Resistance Charts
•This appliance is only intended for installation on a governed supply.
•PMS = 3 bar pressure class 2
•Max CH water pressure 3 bar
•Type C12, C32, C52
•Nox class 2
•Appliance category I2H 2H - G20 - 20mbar
•Ref: 86/AU/588
•Burner Injector Sizes: 30=B12 40=B13 50=B14 60=B15 70=B30 80=B16
•This boiler is designed to operate at a maximum water temperature of 85°C.
61.3mm
Model Seasonal Efficiency
(SEDBUK) (%)
30 78.8
40 77.8
50 76.7
60 77.8
70 77.7
80 77.8
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 Solo 3 PF
All Models
121mm
Top of Outercase

3.0 System Details
7
Typical Systems
Arrangement
Option A
Boiler
Pump
Air Vent
Radiator
Circuit
Fully Pumped System
Air
Vent
Radiator
Circuit
Twin Zone
Valve System
Air
Vent
Radiator
Circuit
3 Port Divertor
Valve System
Option B
Radiator
Circuit
Option C
Fig. 1
Fig. 2
Fig. 3
Fig. 4
Examples of systems which require a
bypass are:-
a) A system controlled by non-electrical
valves e.g. mechanical thermostatic control
valves both on the radiators and the hot
water circuit.
b) A system using twin zone valves (e.g.
Honeywell 'S' Plan) (Fig. 3).
c) A system using a 3 port divertor valve
(Fig. 4) does not normally require a bypass
therefore this system is recommended. The
exception to this is where thermostatic
radiator valves are used and then a bypass
is required.
NOTE: For ‘S’Plan systems the bypass
flow circuit must be situated between
pump and zone valves as option A
shows (Fig. 2).
The bypass circuit can be:-
a) For all boilers a minimum of 6 metres of
22mm copper pipe, (measured between the
boiler flow and return connections). It
should be fitted with a lock shield valve
opened at least 1 full turn or a proprietary
bypass valve set to give a minimum flow
rate of 8 litres/min (1.8 gal/min) (Option C,
Fig. 1 & Option A, Fig.2).
b) A radiator fitted with lock shield valves.
The radiator output should be a minimum of
800 watts (2,700 Btu/h). Typically a
convector type radiator with an area of
3750 cm2(4 sq ft) is adequate (Option B,
Fig. 1).
c) Any circuit that provides the same
operating conditions as option A or option B
(Figs. 1 & 2).
3.1 Water Circulating Systems
1. The appliance is suitable for use with open
vent fully pumped systems and sealed systems
where additional control protection is required.
The following conditions should be observed
on all systems:
•The static head must not exceed 30m (100ft) of
water.
•The boiler must not be used with a direct cylinder.
•The boiler is fitted with a timed pump overrun that
will operate for approximately 8 minutes.
•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.
Treatment of Water Circulating Systems
•All recirculatory water systems will be subject to
corrosion unless an appropriate water treatment is
applied. This means that 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, or Fernox Superfloc. Full instructions are
supplied with the products, but for immediate
information please contact BetzDearborn (0151 420
9563) or Fernox (01799 550 811) directly.
•For long term protection against corrosion and
scale, after flushing it is recommended that an
inhibitor such as BetzDearborn Sentinel X100, or
Fernox MB-1 or Copal is dosed in accordance with
the guidelines given in BS 7593:1992.
Failure to flush and add inhibitor to the system
may invalidate the appliance warranty.
•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.)
•For information or advice regarding any of the
above contact the Baxi Helpline.
3.2 Bypass Requirements
1. The boiler is fitted with a pump overrun device
which allows the removal of residual heat from
the boiler.
NOTE: The pump overrun will operate for
approximately 8 minutes. The system design
must therefore, always provide an open circuit for
water to circulate between the boiler flow and
return.
2. See information opposite “Examples of systems
which require a bypass are”.

3.0 System Details
8
3.3 Pipework
1. The sizes of flow and return pipes from the
boiler should be determined by normal methods,
according to the requirements of the system.
2. An 11 °C (20°F) drop in temperature across the
system is recommended.
3. 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. 4a). The copper pipe must not be insulated.
3.4 System Controls
1. For optimum operating conditions, the heating
system into which the boiler is installed should
include a control system.
2. Such a system will comprise of a timer control
and separate room or cylinder thermostats as
appropriate.
3. The boiler should be controlled so that it
operates on demand only.
4. Operation of the system under control of the
boiler thermostat only does not produce the best
results.
5. A frost thermostat is fitted integrally to the
appliance controls and will protect the boiler from
frost damage by operating the burner when the
water temperature in the boiler drops towards
freezing point. The boiler will fire as necessary to
maintain a temperature above freezing.
NOTE: The frost thermostat operates even if
the boiler thermostat is in the OFF ('0') position
and it is necessary therefore, if the system is
drained, for the external electrical and gas
supplies to be isolated. It is recommended that
a label be affixed to the appliance to draw
attention to the fact that the system has been
drained.
3.5 Low Head Installation
For boilers up to 50,000 Btu/h output
1. Using a close coupled arrangement the
minimum head is as shown in the diagrams
(Figs. 5 & 6) subject to the following conditions:
a) The correct heat input.
b) The pump being adjusted to give an 11oC
drop across the boiler.
c) The pump must be fitted on the flow.
d) The pump must be fitted in accordance with
the pump manufacturer's instructions.
e) The open vent pipe must be taken up from a
tee in a horizontal section of the flow pipe.
Alternative Low Head Installation for all Solo 3 PF
(Fig. 7)
2. If less height is available then a combined vent
and feed pipe may be connected. 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.
Typical Low Head Installation
If Conditions Require,
This System Possible
Alternative Low Head Installation
Boiler
500mm
45°
22mm
Open Vent
1000mm
Min
150mm
Max
15mm
Cold
Feed
400mm
Min Head
Return
Pump
Flow
Boiler
500mm
45°
22mm
Open Vent
400mm
Min Head
1000mm
Min
Automatic
Air Vent 15mm
Cold
Feed
150mm
Max
Return
Pump
Flow
Return
Pump
Flow
Boiler
200mm
Min
Air
Separator
22mm
Feed & Vent
Pipe
Fig. 5
Fig. 6
Fig. 7
Boiler
Flow
Return
Copper
0.5m
Copper
1m
Copper
0.5m
Fig. 4a

3.0 System Details
9
3.6 Sealed Systems (Fig. 8)
1. SAFETY VALVE - A safety valve complying
with the requirements of BS 6283 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.
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 (1/2in) 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 and an
approved stop valve to BS 1010 must be fitted at
low level and the method used for filling the
system should be approved by the local water
undertaking. For further details see BS 6798.
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 pre-
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.
7. HOT WATER STORAGE - The hot water
storage vessel must be of the indirect coil type.
8. SYSTEM 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.
Initial System
Pressure (Bar)
Vessel Charge
Pressure (Bar)
Multiply Total
Water Content Of
System By (Litres)
0.067
0.112
0.207
0.441
0.087
0.152
0.330
0.125
0.265
0.5
1.0
1.5
2.0
1.0
1.5
2.0
1.5
2.0
0.5
1.0
1.5
Example :-
Then :-
System Volume = 75 litres
Vessel Charge Pressure = 1.0 bar
Initial System Pressure = 1.5 bar
75 x 0.152 = 11.4 litres
Expansion Vessel Volume
Method of determining minimum
value of expansion vessel volume for
sealed systems using Baxi Boilers
NOTE
Where a vessel of the calculated size is not obtainable
then the next available larger size should be used.
Safety
Valve
Pressure
Gauge
Pump
Filling
Point
Air
Vent
3 Litre
Top Up Bottle
(if required)
Radiator
Circuit
Expansion
Vessel
System Drains
at Low Point
Max Boiler Flow
Temp = 82°C
Boiler
Fig. 8
Table. 1

4.0 Site Requirements
10
4.1 Location
1. The appliance may be fitted to any suitable wall
with the flue passing through an outside wall and
discharging to atmosphere in a position permitting
satisfactory removal of combustion products and
providing an adequate air supply. The appliance
should be fitted within the building unless otherwise
protected by a suitable enclosure ie. garage or
outhouse. (The appliance may be fitted inside a
cupboard. Cooling ventilation and insulation of the
cupboard are not required, see section 4.5.)
2. If the appliance is fitted in a room containing a bath
or shower reference must be made to the Current
I.E.E. Wiring Regulations and Building Regulations. If
the appliance is to be fitted into a building of timber
frame construction then reference must be made to
the Institute of Gas Engineers document UP7 - Guide
for Gas Installations in Timber Framed Dwellings.
3. Recommendations for flues are given in BS 5440
Part 1.
4.2 Minimum Clearances (Fig. 9)
1. A flat vertical area is required for the installation of
the boiler measuring as shown in the table below for
each model.
2. These dimensions include the necessary
clearances around the appliance 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 appliance.
3. If fitted inside a cupboard the clearance of 300mm
shown is only necessary when the cupboard door is
open. A clearance of 5mm (3/16 in) is required when
the door is closed.
4.3 Flue Position
1. For installations where the flue terminal is
inaccessible from the outside, an internal fitting kit is
available. This can be obtained free of charge from
your local merchant.
2. The following guide lines indicate the general
requirements for siting balanced flue terminals.
3. If the terminal is fitted within 1 metre (39in) of a
plastic gutter, within 500mm (191/2in) of a painted
eave or a painted gutter, an aluminium shield of at
least 1 metre (39in) long should be fitted to the
underside of the gutter or painted surface. An air
space of 5mm (3/16 in) should be left between shield
and gutter (Fig. 10).
4. 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.
5. If the outer surface of an outside wall is of
combustible material, it should be protected by fitting
the flue trim provided.
Fig. 9
Fig. 10
300mm for servicing
5mm during operation
5mm5mm
350mm (30,40,50 models)
600mm
50mm
100mm
462mm (60,70,80 models)
Aluminium
Shield
Model Height Width
mm (in) mm (in)
30 750 (291/2) 360 (141/8)
40 750 (291/2) 360 (141/8)
50 750 (291/2) 360 (141/8)
60 750 (291/2) 472 (185/8)
70 750 (291/2) 472 (185/8)
80 750 (291/2) 472 (185/8)
287mm

4.0 Site Requirements
11
4.3 Flue Position (Cont)
WARNING - The addition of anything that may
interfere with the normal operation of the
appliance (e.g. FLUE DAMPERS,
ECONOMISERS,etc.) without the express
written permission of Baxi UK Limited could
invalidate the appliance warranty and infringe
the GAS SAFETY (Installation and Use)
REGULATIONS.
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.
6. Table 2 and Fig. 11 show the positioning of the
flue terminal relative to buildings and other
structures.
7. The dimensions of the flue terminal are shown
on page 5.
4.4 Flue Dimensions
1. Flue extensions are available as optional
extras for installations up to 3 metres
(1181/8 in).
2. Vertical flue kits are available up to 4
metres in length. Vertical twin flue kits are
available up to 15 metres in length.
IMPORTANT: Solo 3 30 PF models must not
be set at minimum input when installed with
vertical flue systems.
3. The standard telscopic flue is suitable for use
with rear flue lengths between 100mm (4in) and
500mm (195/8in).
NOTE: Maximum flue length when flued to the
left or right is
410mm (16in) - 30, 40, 50 PF
355mm (14in) - 60, 70, 80 PF
4. Where it is intended to pass the flue through a
combustible wall or timber framed dwelling,
reference should be made to the Institute of Gas
Engineers document UP7 - Guide for Gas
Installations in Timber Framed Dwellings.
5. If the flue is more than 1 metre (39 in) long, it
is required that it is supported.
6. All above dimensions are taken from the
respective faces of the outer case.
Table. 2
Fig. 12
Fig. 11
Terminal Position with Minimum Distance (mm)
A Directly below an openable window or other
opening, e.g. an air brick. 300
B Below gutters. 25
C Below eaves, soil pipes or drain pipes. 75
D Below balconies or car port roof 200
E From vertical drain pipes and soil pipes. 75
F From internal or external corners. 25
G Above ground, roof or balcony level. 300
H From a surface facing a terminal. 600
I From a terminal facing a terminal. 1200
J Vertically from a terminal on the same wall. 1500
K Horizontally from a terminal on the same wall. 300
L For an opening in a car port (e.g. door, window)
into a dwelling. 1200
K
G
G
E
L
D
J
G
AAD
F
H,I
B,C
F
Likely flue positions requiring
a flue terminal guard
Maximum lengths for side flues using the standard telescopic flue kit
410mm (30, 40, 50) 410mm (30, 40, 50)
355mm (60, 70, 80) 355mm (60, 70, 80)

4.0 Site Requirements
12
4.5 Ventilation of Compartments
1. Where the appliance is installed in a
cupboard or compartment, no air vents are
required.
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. B.S. 5440 refers to room sealed appliances
installed in compartments. The Solo 3 PF will run
sufficiently cool without ventilation.
4.6 Gas Supply (Fig. 13)
1. The gas installation should be in accordance
with BS 6891.
2. The connection of the appliance is a RC1/2(1/2
in BSPT internal) located at the rear of the gas
cock.
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
appliance gas connection.
4.7 Electrical Supply
External wiring must be correctly earthed,
polarized and in accordance with CURRENT
I.E.E. WIRING REGULATIONS.
The mains supply is 230V ~ 50Hz fused at 5A.
NOTE: The method of connection to the
electricity supply must facilitate complete
electrical isolation of the appliance.
Connection may be made via a fused double-
pole isolator with a contact separation of a least
3mm in all poles and serving the appliance and
system controls only.
Fig. 13

4.0 Site Requirement
13
4.8 Flue Options
1. The Baxi Solo 3 PF can be fitted with flue
systems as illustrated.
2, The standard flue is suitable only for
horizontal applications.
3. Maximum permissible equivalent flue lengths
are:-
Horizontal 3.0 metres
Vertical 4.0 metres
Vertical (Twin) 20.0 metres
4. Any additional “in line”bends in the flue
system must be taken into consideration. Their
equivalent lengths are:-
Concentric Pipes:
45°bend 0.5 metres
90°bend 1.0 metres
Twin Flue Pipes
Air Duct Flue Duct
45°bend 1.3 metres 3.3 metres
90°bend 4.8 metres 12.0 metres
5. The illustrations opposite show examples of
maximum equivalent lengths.
6. Full details of part numbers and descriptions
of all optional flue components and kits can be
found in Baxi Gas Central Heating Boilers
Installers’Guide.
7. Instructions for guidance and fitting are
included in each kit.
IMPORTANT: Solo 3 30 PF models must not
be set at minimum input when installed with
vertical flue systems.
Horizontal
Flues
Vertical
Flues
Vertical
Flues
(Twin Pipe)
Maximum Length = 2m inc. 2 x 45°bends
Maximum Length = 21m
inc. 4 x 45°bends
Maximum Length = 2m
inc. 2 x 90°bends

5.0 Installation
14
5.1 Initial Preparation
1. Unpack contents of carton.
2. Remove the lower door panel from the outer
case. Remove the 2 screws holding the outer
case to the combustion box.
3. Place the ready assembled outer case in a
safe place until required.
4. Release the R clip from the top latch securing
the combustion box to the back plate and
release both latches (Fig. 14).
5. Lift and remove the combustion box from the
back plate (Fig. 15). Place the combustion box
on its back.
IMPORTANT - When installing a Solo 3 with
a rear flue see section 5.2 before continuing
the installation.
6. Proceed to the relevant section for flueing the
appliance either to the Rear, Left, Right or
Vertically.
NOTE: For Vertical flueing or flue lengths
greater than standard, the relevant optional
extra kits must be obtained and their
instructions followed.
Fig. 14
Fig. 15

5.0 Installation
15
5.2 Fan Outlet Restrictor
(30, 40, 50, 60, 70 and 80)
Rear Flue only up to 500mm (195/8in)
1. Release the four latches holding the
combustion box door (Fig 18). Remove the
combustion box door by pulling forward (Fig. 16).
2. Release the 5-pin electrical plug connecting
the pressure switch and fan (Fig. 17). Withdraw
the fan assembly by pulling forwards from the
top edge (Fig. 16).
3. Take the sheetmetal restrictor (supplied in the
kit of parts), check that the number stamped on
the restrictor matches the appliance (e.g. 50
stamped on the restrictor is for 50 PF appliance)
4. Fit the restrictor to the fan outlet flange,
bending the 3 lugs equally ensuring the restrictor
seals against the fan outlet flange (Fig. 19).
5. Re-assemble the fan assembly and
combustion box door ensuring that the flexible
tubes from the fan unit to the pressure switch are
routed correctly and that they are not kinked or
flattened (Fig. 19a).
Fan Outlet Flange
Fan Outlet Restrictor
Fig. 17 Fig. 18
Fig. 16
Fig. 19
Flexible Tubes
Fig. 19a

5.0 Installation
16
5.3 Position the Boiler
1. Choose a suitable position for the boiler
making necessary allowances for the minimum
clearances required (see page 10).
2. Hold the wall template against the wall at the
required boiler location. Ensure that the top of
the template is level (Fig. 20).
3. The template represents the outer limits of the
appliance plus the required minimum side
clearance.
4. Mark the position of the flue hole centre and
the inward pointing corners of the two triangular
cutouts in the template. Mark the position of the
four fixing holes. Where possible use the
uppermost and lowest fixing hole positions,
otherwise space the fixing holes as far apart as
possible (Fig. 20).
5.4 Rear Flue
Concentric flue kits are available to allow 3
metres horizontal and 4 metres vertical
flueing. Twin flue at 80mm diameter will allow
up to 15 metres vertical flueing.
1. For installations where the flue terminal is
inaccessible from the outside, an internal fitting
kit is available. This can be obtained from your
local merchant quoting Baxi Part No236441.
2. If using the internal fitting kit a 117mm
(45/8in) diameter hole is required.
3. Drill the anchorage holes 63mm (21/2in) deep
to accept suitable wall plugs (Fig. 21).
4. Using the previously marked flue hole centre,
cut a hole approximately 107mm (41/4in)
diameter in the masonry for the 100mm (4 in)
diameter flue duct. (When using a core drill, it is
important to keep the drill level and square).
Fig. 20
Fig. 21

5.0 Installation
17
5.5 Rear Flue Preparation
Wall thickness 285mm - 500mm (115/16 - 193/8) go
to section 5.6.
Wall thickness 100mm - 284mm (4 in - 113/16 in).
If the wall thickness is less than 285mm (113/16 in),
it will be necessary to cut the components of the
flue to the appropriate size.
1. Measure the wall thickness (Fig. 22). Mark this
dimension on the Flue Duct from the flared end
and cut the waste off the plain end (Fig. 23).
2. Take the Flue Terminal Assembly and
measure from the terminal end the wall thickness
and subtract 40mm (Fig. 23a). Cut the waste off
the plain end.
Wall Thickness - 40mm (all boilers)
3. The cardboard support should be installed onto
the flue tubes to ensure the assembly is
supported during cutting (Fig. 25 & 26).
4. Measure the same amount from the flange end
of the Air Duct and cut the waste off the plain end
(Fig. 24).
Wall Thickness - 40mm (all boilers)
5. Go to section 5.6.
Wall Thickness
Fig. 23
Fig. 23a
Fig. 24
Fig. 25
Fig. 26
Fig. 22
Waste Wall Thickness
Flue Duct
WasteWall Thickness - 40mm
Wall Thickness - 40mmWaste
Cardboard
Support
Cut Line
Flue Terminal Assembly
Air Duct
Cardboard
Support

5.0 Installation
18
5.6 Assembly of Rear Flue
1. Remove the rear air box blanking plate from
the back plate by releasing the three screws
(Fig. 27).
2. Remove the blanking cap at the rear of the
turret, by pushing and turning anti-clockwise to
release the bayonet fitting (Fig. 27).
3. Locate the flared end of the flue duct over the
bayonet fitting on the turret, taking care not to
damage the 'O' ring. Lock the flue duct in place by
pressing in and turning clockwise (Fig. 28).
4. Engage the bayonet slots of the air duct over
the location lugs on the back plate opening and
press and turn clockwise to secure the air duct to
the back plate (Fig. 29).
5. In order to increase security of the flue, the
bayonet tags may be deformed to secure the flue
in position.
6. Take the flue terminal assembly and engage
on the flue and air ducts. Slide the flues together
to the desired wall thickness.
7. Tape the sections of the outer ducts together
with the tape provided ensuring a good seal is
made (Fig. 30).
Fig. 27
Fig. 28
Fig. 29
Flue Duct
Air Duct
Tape
Fig. 30
Air Box
Blanking Plate
Blanking
Cap
Backplate

5.0 Installation
19
5.7 Fitting the Back Plate
1. Engage the assembly into the hole previously
cut in the wall and slide in place (Fig. 31).
2. Secure the assembly to the wall at the
previously drilled anchorage points with suitable
screws (Fig. 31). Before finally tightening the
screws, check that the assembly is level.
3. Make good between the wall and the air duct
outside the building if the internal fitting kit has
not been used (Fig. 32).
4. The flue trim provided may be fitted if required,
to neaten the make-up around the terminal
(Fig. 33).
5. To fit the flue terminal trim:
a) The trim should be fitted once the flue is
secure.
b) Take the three edge clips from the kit and fit
them equi-spaced onto the inner flange of the
trim (Fig. 32a).
c) With the flanges towards the wall pass the trim
over the terminal. If required a bead of sealant
may be applied to the rear face of the trim.
d) Push firmly on the trim to ensure the edge clips
engage on the flue.
Fig. 31
Fig. 33
Fig. 32
Edge Clip
Flue Trim
Flue Trim
Fig. 32a

5.0 Installation
20
5.8 Left or Right Flue
Concentric flue kits are available to allow 3
metres horizontal and 4 metres vertical
flueing. Twin flue at 80mm diameter will allow
up to 15 metres vertical flueing.
NOTE: If the flue terminal is inaccessible from
outside the building, it is necessary to fix the
internal fitting kit in position before continuing
with the installation. (See section 5.15 Internal
Fitting Kit of these instructions).
1. The procedure for fitting the appliance flued to
the left or right hand side is the same.
2. 30-40-50 PF - Left/Right Hand Side maximum
flue 410mm (16 in).
3. 60-70-80 PF - Left/Right Hand Side maximum
flue 355mm (14 in).
4. Using the previously marked flue hole centre
(Section 5.3) and the two marks made at the
triangular cutouts of the template, mark the
horizontal centre line for the flue assembly
(Fig. 34).
5. Extend this line either left or right as required,
to the corner of the room (Fig. 34).
6. Extend the horizontal centre line around the
corner for approximately 300mm (12 in). Ensure
that the line remains horizontal by checking with a
spirit level (Fig. 35).
7. From the wall template cut out the ‘D’shaped
section. Using this as a template, line up the
horizontal triangular cut outs with the extended
300mm (12 in) line and make sure that the flat of
the template is butted up against the corner of the
wall (Fig. 36).
8. If the appliance mounting wall is out of true, use
string or a straight edge to determine the true
corner position and mark a vertical line to
accommodate the flat edge of the template.
9. Holding the template firmly, mark the vertical
centre line for the flue assembly by marking the
point at the outer corners of the upper and lower
cut outs (Fig. 37).
10. Remove the template and draw a vertical line
between the two marks. The intersection of the
vertical and horizontal lines is the centre of the
flue hole (Fig. 38).
11. If using the internal fitting kit a 117mm (45/8in)
diameter hole is required.
12. Cut a hole approximately 107mm (41/4in)
diameter in the masonry for the 100mm (4 in)
diameter flue duct (Fig. 39). (Use of a core drill is
recommended. When using a core drill, it is
important to keep the drill level and square,
particularly with the wall onto which the boiler is to
be fitted).
13. Drill the anchorage holes 63mm (21/2in) deep
to accept suitable wall plugs.
Fig. 34
Fig. 35
Fig. 36
Fig. 37
Fig. 38
Fig. 39
Maximum lengths for side flues using the standard telescopic flue kit
410mm (30, 40, 50) 410mm (30, 40, 50)
355mm (60, 70, 80) 355mm (60, 70, 80)