FireBird Enviromax Popular C20 User manual

Working towards a greener planet
TECHNICAL MANUAL INCLUDES
❯❯ END USER INSTRUCTIONS
❯❯ INSTALLER GUIDE
❯❯ COMMISSIONING
❯❯ SERVICING
❯❯ PARTS
ENVIROMAX
CONDENSING RANGE
This manual must remain with the end user on completion of installation
TECHNICAL MANUAL
For use with Diesel 35 Second Gas Oil

1
CONTENTS
PAGE
1. FOREWORD & INTRODUCTION 2
2. TECHNICAL SPECIFICATIONS
2.1 System Boiler ................................................................................................................................................ 3
2.2 Kitchen (Basic) & Commercial Utility Boilers .............................................................. 4
2.3 Slimline Systempac Boiler ................................................................................................................. 5
3. INSTALLATION IN NEW ZEALAND AND AUSTRALIA ......... 6
4. SAFETY....................................................................................................................................................................... 7
5. END USER INSTRUCTIONS
5.1 Operating procedure ........................................................................................................................ 8
5.2 Thermostat Control & Burner Lockout ........................................................................ 9
6. INSTALLATION
6.1 Guidelines ......................................................................................................................................................... 10
6.2 Positioning the Boilers ......................................................................................................................... 11
6.3 Condensate Disposal .............................................................................................................................. 12
6.4 Sealed System Heating Circuit ............................................................................................... 14
6.5 Flue Regulations............................................................................................................................................ 17
6.6 Ventilation & Combustion Air Requirements ........................................................... 21
6.7 Flue Assembly ............................................................................................................................................... 25
6.8 Wiring ................................................................................................................................................................... 26
6.8.1 System Boiler .................................................................................................................................. 26
6.8.2. Kitchen (Basic) & Commercial Utility Boilers ............................................. 27
6.8.3 Slimline Systempac Boiler .................................................................................................. 28
6.9 Oil Supply .......................................................................................................................................................... 29
7. COMMISSIONING ................................................................................................................................31
8. SERVICING ....................................................................................................................................................... 33
9. BURNER
9.1 Burner Settings ............................................................................................................................................ 34
9.2 G10 Blast Tube ............................................................................................................................................ 35
9.3 Specifications ................................................................................................................................................. 36
9.4 Fault Finding .................................................................................................................................................. 37
10. PARTS & BAFFLES
10.1 System Boiler .............................................................................................................................................. 38
10.2 Kitchen (Basic) & Commercial Utility Boilers ........................................................... 40
10.3 Slimline Systempac Boiler ............................................................................................................... 42
10.4 Burner ................................................................................................................................................................. 44
11. STANDARDS & REGULATIONS ..................................................................................... 46
12. TERMS & CONDITIONS OF WARRANTY 47
13. SERVICE RECORD 48
14. COMMISSIONING CARD 49

1
2
FOREWORD & INTRODUCTION
We would like to thank you for purchasing a
high efficiency Firebird condensing domestic or
commercial central heating boiler. This instruction
manual is produced for the reference and
guidance of qualified installation engineers such as
those who are OFTEC registered. EU legislation
governs the manufacture, operation and
efficiency of all domestic central heating oil
boilers. Our boilers and burners will are supplied
as matched units tested and approved to OFTEC
Standard OFS Al00.
FIREBIRD Boilers are full manufacturing members
of OFTEC (Oil Firing Technical Association) and
are participating in its Boiler testing and approvals
programme to comply with OFS A100 and EC
Efficiency Directive.
You should ensure that all installation, servicing
and commissioning works are carried out by a
competent person, such as one registered by
OFTEC. It should be noted that it is the
responsibility of the Installer/Householder to
ensure that the boiler is properly
commissioned. Failure to do so may invalidate
the boiler warranty.
SERVICING
The boiler requires servicing on an annual basis
to ensure it maintains its efficiency, continues
to perform reliably and as a regular check on
its built-in safety features. It is important that
servicing should be conducted by a competent
engineer, such as one who is OFTEC trained
and registered.
All appropriate OFTEC manuals and BS
Standards should be studied and their
requirements adhered to and used in
conjunction with these instructions. This
manual includes a list of some BS Standards
and Building Regulations.
OFTEC is conducting training and registration of
engineers and this is to be commended, as
reading of this manual alone for installation and
servicing procedures cannot replace the critical
advantage provided by training and years of
experience.
Firebird domestic or commercial condensing
boilers are highly efficient and are all
independently certified to SEDBUK Band A. They
use less fuel and have lower running costs than
non-condensing boilers. Because of their
increased efficiency they emit less carbon
dioxide than non-condensing boilers, which will
contribute to efforts to reduce global warming.
The incredible efficiency of the Firebird
Condensing Boiler is due to the development of a
single boiler unit with two unique heat exchanger
units. This gives a exchange surface greater than
non-condensing boilers.
This additional surface area increases the amount
of heat extracted from the combustion process
and thus reduces the heat wasted to atmosphere.
So much heat is extracted from the combustion
gases that their water vapor element condenses
into liquid form, releasing the latent heat that was
used to create the vapor in the first place. It is this
heat gain that gives the condensing boiler its
significant advantage over a non-condensing
model. In order to enable this high level of heat
extraction to take place, the water in the boiler’s
heat exchanger must be cooled down to about
55°C or less, this means that the boiler is working
at its maximum efficiency
The condensate produced is often mistakenly
considered to be highly acidic. In fact the acidity of
condensate from a Firebird Condensing Boiler
will be found to be as low, if not lower, than that
of vinegar.
The Firebird Condensing Boiler is suitable for
under floor heating provided the return
temperature is above 40˚C. at all times.
The Firebird Condensing Boiler even when not
working in condensing mode will still operate at
extremely high efficiencies making it suitable for
fitting to an existing heating system without
alteration to the radiator sizes.
The burner is factory set for use with
Diesel 35 Second Gas Oil. The burner will
require commissioning as described in the
commissioning section of this manual due to
flue configurations and load conditions.

Boiler Model C20 + C26 C35 C44
Heat Output kW 15-20/20-26 26-35 35-44
Max. BTU/h (‘000) 50-90 90-120 120-150
CONNECTIONS
Heating Flow 22 mm dia. 28 mm dia. 11/2”BSP
Heating Return 1” BSP 1” BSP 11/2”BSP
Mains Cold Feed (Copper) 15 mm dia. 15 mm dia. 15 mm dia.
Hot Water Delivery (Copper) - - -
Drain Off Valve 1/2”BSP 1/2”BSP 1/2”BSP
Safety Pressure Valve Outlet (Copper) 15 mm dia. 15 mm dia. 15 mm dia.
Condensate Trap 22 mm dia. plastic 22 mm dia. plastic 22 mm dia. plastic
CIRCULATING PUMP 25/60 25/60 25/80
Integral Expansion Vessel Normal Capacity 12 litres 12 litres 18 litres
Expansion Vessel Pre-charge Pressure 1 bar 1 bar 1 bar
Low Pressure Water Switch?   
Filling Loop Included?   
WATER CONTENT
Boiler 24 litres 24 litres 45 litres
Primary Tank -- -
FLUE (Indoor Boilers)
Balanced Flue Assembly 125 (5”) mm dia. 125 (5”) mm dia. 150 (6”) mm dia.
Conventional Flue Assembly 80 id. mm dia. 80 id. mm dia. 100 id. mm dia.
Max. Low Level Flue Length 1.5m 1.5m 1.5m
Max. High Level Flue Length 6m 6m 6m
Max. Vertical Level Flue Length 6m 6m 6m
HEATING SYSTEM (SEALED) Fit in accordance with BS 7074 Part 1, BS 5449, OFTEC standards and all other relevant legislation.
Max. Operating Pressure 2.5 bar
Max. System Pressure Cold 1.5 bar
Min. System Pressure Cold 0.5 bar
Preset Pressure Relief Valve 3 bar
MAINS WATER SUPPLY PRESSURE Min. 1 bar - Max. 10 bar (for user comfort, we recommend pressure at tap to be between 2 and 5 bar).
Limescale excess:When over 150/200 ppm, fit appropriate scale reducer.
WATER SIDE RESISTANCE 20kW 26kW 35kW
Flow Rate To Give A Nominal Output At 10K Differential
Flow Rate Measured 1642 kg/h 2135 kg/h 2874 kg/h
Waterside Resistance 0.18 mbar 0.18 mbar 0.18 mbar
Flow Rate To Give A Nominal Output At 20K Differential
Flow Rate Measured 870 kg/h 1131 kg/h 1523 kg/h
Waterside Resistance 0.19 mbar 0.19 mbar 0.19 mbar
PRESSURE JET OIL BURNERS Riello RDB 2.2R
FUEL Diesel 35 Second Gas Oil
ELECTRICAL SUPPLY 230V AC 50Hz 5A
TEMPERATURE CONTROL
Boiler Central Heating Control 60˚C - 80˚C
Boiler Safety Limit 110˚C
Over-run - Fixed 87˚C
2
3
2.1 TECHNICAL SPECIFICATIONS - SYSTEM BOILER
Model Output Weight Dimensions(mm)
Enviromax kW kg H W D A B C E F G I J
System C20 15-20 143 847 442 610 753 - 157 94 124 - 336 75
System C26 20-26 146 847 442 610 753 - 157 94 124 - 336 75
System C35 26-35 149 847 442 610 753 - 157 94 124 - 336 75
System C44 35-44 235 1048 660 852 914 232 154 100 125 111 485 86
C
B
H
W
A
I
J
FG
E
D
Front View Side View
W
F
H
Top View
C
E
J
I
D
A
System C20, C26 & C35 System C44
Front View Side View Top View
Use of copper pipe is recommended for a minimum of 1 metre off the boiler.

2
4
2.2 TECHNICAL SPECIFICATIONS - KITCHEN (BASIC) & COMMERCIAL UTILITY BOILERS
Front View Side View Top View
W
FG
H
E
D
J
I
A
C
Boiler Model C12/18 C44 C73 Commercial Utility
Heat Output kW 12-18 35-44/44-58 58-73 80-100
Max. BTU/h (‘000) 40-60 120-200 200-250 270-340
CONNECTIONS
Heating Flow 1” BSP 11/2” BSP 11/2” BSP 2” BSP
Heating Return 1” BSP 11/2” BSP 11/2” BSP 2” BSP
Drain Off Valve 1/2”BSP 1/2”BSP 1/2”BSP 1/2”BSP
Condensate Trap 22mm dia. plastic 22mm dia. plastic 22mm dia. plastic 22mm dia. plastic
WATER CONTENT
Boiler 24 litres 43.5 litres 54 litres 75 litres
FLUE (Indoor Boilers)
Balanced Flue Assembly 125 (5”) mm dia. 150 (6”) mm dia. 180 (7”) mm dia. 200 (8”) mm dia.
Conventional Flue Assembly 80 id. mm dia. 100 id. mm dia. 125 id. mm dia. 150 id. mm dia.
Max. Low Level Flue Length 1.5m 1.5m 1.5m 1.5m
Max. High Level Flue Length 6m 6m 6m 6m
Max. Vertical Level Flue Length 6m 6m 6m 6m
HEATING SYSTEM (SEALED) Fit in accordance with BS 7074 Part 1, BS 5449, OFTEC standards and all other relevant legislation.
Preset Pressure Relief Valve 3 bar
MAINS WATER SUPPLY PRESSURE Min. 1 bar - Max. 10 bar (for user comfort, we recommend pressure at tap to be between 2 and 5 bar).
Limescale excess:When over 150/200 ppm, fit appropriate scale reducer.
WATER SIDE RESISTANCE 20kW 26kW 35kW
Flow Rate To Give A Nominal Output At 10K Differential
Flow Rate Measured 1642 kg/h 2135 kg/h 2874 kg/h
Waterside Resistance 0.18 mbar 0.18 mbar 0.18 mbar
Flow Rate To Give A Nominal Output At 20K Differential
Flow Rate Measured 870 kg/h 1131 kg/h 1523 kg/h
Waterside Resistance 0.19 mbar 0.19 mbar 0.19 mbar
PRESSURE JET OIL BURNERS Riello RDB 2.2R up to C44 & Riello RDB 4.2 up to C100
FUEL C2 Kerosene
ELECTRICAL SUPPLY 230V AC 50Hz 5A
TEMPERATURE CONTROL
Boiler Central Heating Control 60˚C - 80˚C
Boiler Safety Limit 110˚C
Use of copper pipe is recommended for a minimum of 1 metre off the boiler.
Model Output Weight Dimensions(mm)
Enviromax kW kg H W D A C E F G I J
Kitchen (Basic) C12/18 12-18 115 847 345 610 753 157 94 124 502 336 75
Kitchen (Basic) C44 35-44 210 1048 464 852 914 154 100 130 615 485 86
Kitchen (Basic) C58 44-58 216 1048 464 852 914 154 100 130 615 485 86
Kitchen (Basic) C73 58-73 242 1196 524 851 1024 157 100 125 670 484 86
Commercial Utility 80-100 390 1249 623 1071 - 158 130 132 832 723 72

2
5
2.3 TECHNICAL SPECIFICATIONS - SLIMLINE SYSTEMPAC BOILER
Model
Enviromax
Output
kW
Weight
kg
Dimensions
HWDA I J
Slimline Systempac C26 20-26 150 920 465 760 794 277 126
Slimline Systempac C35 26-35 153 920 465 760 794 277 126
H
WD
J
I
J
A
Boiler Model C26 C35
Heat Output kW 20-26 26-35
Max. BTU/h (‘000) 70-90 90-120
CONNECTIONS
Heating Flow 22 mm dia. 28 mm dia.
Heating Return 1” BSP 1” BSP
Mains Cold Feed (Copper) 15 mm dia. 15 mm dia.
Hot Water Delivery (Copper) - -
Drain Off Valve 1/2”BSP 1/2”BSP
Safety Pressure Valve Outlet (Copper) 15 mm dia. 15 mm dia.
Condensate Trap 22 mm dia. plastic 22 mm dia. plastic
CIRCULATING PUMP 25/60 25/60
Integral Expansion Vessel Normal Capacity 12 litres 12 litres
Expansion Vessel Pre-charge Pressure 1 bar 1 bar
Low Pressure Water Switch?  
Filling Loop Included?  
WATER CONTENT
Boiler 24 litres 24 litres
Primary Tank --
FLUE Integral Flue Integral Flue
HEATING SYSTEM (SEALED) Fit in accordance with BS 7074 Part 1, BS 5449, OFTEC standards and all other relevant legislation.
Max. Operating Pressure 2.5 bar
Max. System Pressure Cold 1.5 bar
Min. System Pressure Cold 0.5 bar
Preset Pressure Relief Valve 3 bar
MAINS WATER SUPPLY PRESSURE Min. 1 bar - Max. 10 bar (for user comfort, we recommend pressure at tap to be between 2 and 5 bar).
Limescale excess:When over 150/200 ppm, fit appropriate scale reducer.
WATER SIDE RESISTANCE 20kW 26kW 35kW
Flow Rate To Give A Nominal Output At 10K Differential
Flow Rate Measured 1642 kg/h 2135 kg/h 2874 kg/h
Waterside Resistance 0.18 mbar 0.18 mbar 0.18 mbar
Flow Rate To Give A Nominal Output At 20K Differential
Flow Rate Measured 870 kg/h 1131 kg/h 1523 kg/h
Waterside Resistance 0.19 mbar 0.19 mbar 0.19 mbar
PRESSURE JET OIL BURNERS Riello RDB 2.2 R
FUEL Diesel 35 Second Gas Oil
ELECTRICAL SUPPLY 230V AC 50Hz 5A
TEMPERATURE CONTROL
Boiler Central Heating Control 60˚C - 80˚C
Boiler Safety Limit 110˚C
Over-run - Fixed 87˚C
Use of copper pipe is recommended for a minimum of 1 metre off the boiler.

3
6
INSTALLATION IN NEW ZEALAND & AUSTRALIA
This appliance has been manufactured in compliance with AS1690
Domestic Oil Fired appliances Safe Design Code.
This appliance has a current Occupational Safety and Health (OSH)
and Environmental Risk Management Association (ERMA)
Clean Air Approval number of BUR0801
This appliance and flue system has been tested by CRL Laboratories in
New Zealand ( Certificate number 07-41180 ) and can be
installed to meet the requirements of AS1691-1985
Domestic Oil Fired Appliances Installation.
This includes suitability for zero clearance installation to
combustible surfaces.
Please ensure that this appliance and flue system is installed to comply with
manufacturers instructions and AS1691-1985 Domestic Oil fired Appliances Installation.
Please ensure that the appliance is bolted to the floor for seismic restraint.
Firebird recommend the use of Firebird coaxial flue systems to achieve room sealed operation.
However, conventional flue systems are also suitable.
The installation of this appliance and fuel source will require a building
consent from your local council.
THIS APPLIANCE IS TUNED TO RUN ON DIESEL FUEL.
This appliance must be installed by experienced personnel.
Failure to install correctly will invalidate the warranty.
The warranty does not cover consequential damages.
If you have any queries with this product, please consult:
Central Heating New Zealand Ltd.,
52 Pilkington Way,
Wigram,
Christchurch 8042,
New Zealand.
Tel: +(0) 64 3357 1233
www.centralheating.co.nz

4
Safe use of Diesel.
These fuels give off a flammable vapour when heated
moderately. Vapour ignites easily, burns intensely and
may cause explosion. The vapour can follow along at
ground level for considerable distances from open
containers and spillages collecting as an explosive
mixture in drains, cellars, etc.
Fuels remove natural oils and fats from the skin and
this may cause irritation and cracking of skin. Barrier
cream containing lanolin is highly recommended
together with good personal hygiene and where
necessary appropriate personal protection
equipment (P.P.E.).
Gas oil may also cause irreversible damage to health
on prolonged or repeated skin contact.
Always store fuels in a properly constructed and
labelled tank. Always handle fuel in open air or well
ventilated space away from sources of ignition and
refrain from smoking.
Always drain fuel using a proper fuel retriever, funnel
or mechanical siphon. Never apply heat to a fuel tank,
container or pipework. Never siphon fuel through
tube by mouth. If accidentally swallowed contact
doctor immediately and do NOT induce vomiting.
Avoid inhaling fuel vapour as this can cause light
headedness and seriously impair judgement.
Under the Consumer Protection Act 1987 (UK),
section 6 of the Health and Safety Act 1974 (UK) and
the Safety, Health and Welfare at Work Act 2005
(ROI), we are required to provide information on
substances hazardous to health.
INSULATION AND SEALS
Ceramic Fibre, Alumino - Silicone Fibre material are
used for boards, ropes and gaskets. Known hazards
are that people may suffer reddening and itching of
the skin. Fibre entering the eye will cause foreign
body irritation. It may also cause irritation to the
respiratory tract.
Precautions should be taken by people with a history
of skin complaints or who may be particularly
susceptible to irritation. High dust levels are only
likely to arise following harsh abrasion. Suitable
personal protective equipment should be worn where
appropriate.
Generally, normal handling and use will not give
discomfort. Follow good hygiene practices, wash
hands before consuming food, drink or using the
toilet.
First Aid - Medical attention should be sought
following eye contact or prolonged reddening of the
skin.
The small quantities of adhesives and sealants used in
the product are cured. They present no known
hazards when used in the manner for which they are
intended.
1. Switch off all electrical and other ignition
sources.
2. Remove all contaminated clothing to safeguard
against fire risk and skin damage. Wash affected
skin thoroughly with soap and water and
remove clothing to a safe well ventilated
area and allow to air before cleaning.
3. Contain and smother the spill using sand or
other suitable oil absorbent media or
non-combustible material.
4. Do not allow fuel to escape into drains or water
courses. If this happens, contact the relevant
authorities in your area (Ireland).
Contact The Environment Agency on
0800 807060 (UK).
5. Consult local Authority about disposal of
contaminated soil.
If fuel is accidentally swallowed:
* Seek medical attention immediately. Do NOT
induce vomiting.
If fuel is splashed into eyes:
* Wash out with running water for at least ten
minutes and seek medical attention.
HEALTH & SAFETY INFORMATION
THIS PRODUCT HAS BEEN DESIGNED
TO THE FOLLOWING STANDARDS:
EMC Directive
(Electromagnetic compatibility) 89/336/EC
Standards:
EN 61000-6-1: Electromagnetic Compatibility Generic
Standard - Immunity for residential, commercial and
light industrial environments. (Feb.2001)
EN 61000-6-3: Electromagnetic Compatibility Generic
Standard - Emission standard for residential,
commercial and light industrial environments.
(Feb.2001)
LV Directive
(Low voltage) 73/23/EEC
Standard:
IEC 60335-1: Household and similar electrical
appliances - Safety (May 2001)
Boiler Efficiency Directive 92/42/EEC
Standard:
BSEN 304: Oil boilers with forced draft burners.
FUEL SPILLAGE
SAFETY
FIRST AID
7
SAFETY

5
8
5.1 END USER INSTRUCTIONS - OPERATING PROCEDURE
Mains supply light *
Burner lock out light *
Burner plug
Temperature
control
BURNER
Lock-out
re-set button
High Limit
re-set button
Kitchen (Basic) &
Commercial Utility
Boiler
Burner plug
Temperature
control
BURNER
Lock-out
re-set button
High limit
re-set button
Pressure
vessel
System
Boiler
TO START THE BOILER:
Turn on fuel supply.
Switch on power supply to boiler.
Turn the house heating control “ON” and increase the temperature to call for heat.
Set the boiler thermostat to the required temperature (see Figure 1 on next page). The boiler thermostat controls the
boiler operation by automatically maintaining the required boiler water temperature output. Safe operation is also
maintained by the burner control system which provides the required ignition and shut off sequence.
If a time control is fitted this will automatically switch the boiler off and on when heat is required.
TO TURN OFF THE BOILER:
 Turn the timer control (if fitted) to “OFF”.
 Turn off the mains electrical supply to the boiler.
Temperature
control
BURNER
Lock-out
re-set button
High limit
re-set button
Burner plug
Slimline Systempac
Boiler

Figure 1
5
9
5.2 END USER INSTRUCTIONS - THERMOSTAT CONTROL & BURNER LOCKOUT
(ALL MODELS)
The boiler is factory fitted with a burner control box lockout safety feature which operates automatically if a fault occurs
in the burners operation. Should this occur, the red light on the front of the burner - see burner section page 40 or boiler
photo - will illuminate and its cause must be investigated.This could be caused by:
A. An interruption in the fuel supply (eg. empty oil supply tank).
B. An electrical supply fault.
C. A fault with the burner or its safety control system.
D. The failure of a component (eg. photo cell).
E. Worn or dirty oil nozzle.
Before attempting to restart the boiler the front panel and the burner cover should be removed and a visual check
made for any obvious problems such as oil leaks, loose connections etc.
ENSURE OIL TANK CONTAINS CORRECT GRADE FUEL
DIESEL 35 SECOND GAS OIL
TO RESTART THE BOILER:
1. Press reset button see burner section or boiler photo.
2. Ensure that the boiler thermostat, time switch (if fitted) and any external controls connected to the boiler are set
to call for heat.
3. Check that the oil supply valves and remote sensor fire valve are open and that there is sufficient oil in the tank.
4. Check that the burner lockout light is unlit and with the mains on, the boiler will be ready to commence its
start sequence.
BURNER LOCKOUT
WATER TEMPERATURE THERMOSTAT CONTROL
Set at Max 80˚C Set at Mid 70˚C Set at Min 60˚C

6
10
6.1 - INSTALLATION - GUIDELINES
The safety high limit thermostat [2] will shut off the boiler
and will require the limit button to be pushed to restart
the boiler. If the problem re-occurs, you should call your
service engineer.
In cases where the flow from the boiler is immediately in
a downstream direction to the heating system, fitting
a pump over run thermostat [3] (a pipe stat) is
recommended.This is to prevent the residual heat build up
in the boiler from unnecessarily activating the high limit
thermostat and thus causing nuisance. See Slimline
Systempac wiring diagram.
Factory fitted pump overrun thermostats are fitted to the
System and Slimline Systempac boilers.
TIME AND TEMPERATURE CONTROLS
The Building Regulations state that central heating
systems must have time and temperature control on the
pipe circuits (eg thermostatic radiator valves / TRVs, room
thermostats, cylinder thermostats etc.).
BURNER
The burner is factory set for use with
Diesel 35 Second Gas Oil.
ROOM SEALED BALANCED FLUES
BS 5410 Part 1: 2014 - Code of Practice for Oil Firing -
Installation up to 44kW Output Capacity for Space
Heating and Hot Water Supply Purposes - Paragraph 11.2
Mounting.
The flue terminal should be mounted so that it is
separated from any combustible material forming a part of
the building.
Such combustible material may take the form of cladding
on the surface of a non-combustible wall through which
the flue outlet passes. Refer to Zero Clearance Test Report
by Central Heating New Zealand.
The wall through which the flue outlet passes may itself be
of combustible material, and if so, the flue outlet, where it
passes through the wall, should be surrounded by
non-combustible insulating material not less than 50mm
thick. The insulating material itself should be contained in
a steel liner to provide the necessary structural rigidity and
to prevent moisture reaching the insulating material.
Please note the following important points
before commencing installation. Failure to do
so will invalidate warranty.
INSTALLATION & COMMISSIONING
Boilers must be installed, commissioned and serviced by
qualified and experienced persons and as set out in the
installation manual, using correct test equipment.
EXPANSION VESSEL
Total water content of system and boiler must be
calculated to determine if an additional pressure vessel is
required.
HARD WATER - LIMESCALE
Failure to check water hardness and fit appropriate water
softening equipment will result in scale build up and
consequent reduction in water heating performance.
Check with local Water Authority if in doubt.
PLASTIC PIPING - WARNING
The boiler thermostat control and safety system is not
designed, and must not be relied on, to protect plastic
pipe from overheating. Plastic pipe is not recommended
to be connected directly to the boiler. If you choose to
use plastic pipe anywhere on your heating circuits,
please consult the plastic pipe manufacturer for their
instructions on how to ensure their product never
overheats. Our boiler control and safety high limit
thermostats are not designed to fulfil this function. (They
may suggest the fitting of independent pipe thermostats,
or thermostatic mixing valves linking flow and return).
• Firebird accepts no responsibility for failure of plastic
piping and fittings for whatever reason.
WARNING
The manufacturer cannot accept responsibility for any
damage to persons, animals or property due to error in
installation or in the burner adjustment or due to
improper or unreasonable use or non observance of the
technical instruction enclosed with the burner, or due to
the intervention of unqualified personnel.
BOILER THERMOSTAT / THERMISTOR FUNCTION
The control thermostat [1] on the boiler allows the house-
holder to vary the water flow temperature from a low of
60˚C to a high of 80˚C to 82˚C, depending on the model.
In accordance with EU boiler standards, your boiler is also
fitted with a safety high limit thermostat [2],fixed at 114˚C.
This system protects the boiler in the event of the control
thermostat failing and keeps the boiler safe.

6
11
6.2 - INSTALLATION - POSITIONING THE BOILER
Ensure that adequate clearance is available for making the water and flue connections.
As the boiler is serviced from the front, no headroom clearance is necessary but a
clearance of 750mm must be available at the front of the boiler.
No special hearth is required as the boiler is fully insulated and has been certified as a zero clearance appliance,
but the floor must be level and capable of supporting the weight of the boiler and its water content.
Sound levels must also be a consideration.Whilst Firebird Enviromax boilers are one of the quietest boilers on
the market, some end users are particularly sensitive and the following points should be considered:
1. Tiled surfaces in a small room will amplify noise - particularly if the wall construction is hollow.
2. If a conventional flue passes through a bedroom it is capable of transmitting noise.
3. Low level balanced flue terminals can produce exhaust noise on the outside terminal
and this should be considered when siting near adjacent property.
4. The Firebird Balanced Flue Kit has been specifically designed for
Firebird’s indoor boilers. The use of third party low level flue kits
is not recommended and will affect its warranty.
5. The Siting of the boiler should take into account
the disposal of condensate products.
• It is mandatory that a suitable
corrosion inhibitor is added to the
heating system e.g. Fernox.
• New and existing systems should be
treated with chemical cleaner and
properly flushed before the boiler is
fitted and corrosion inhibitor added.
• In areas of hard water a suitable
descaler would also be required.
Please, ensure that:
1. Adequate clearance is available for making
the water and flue connections.
2. Refer to Zero Clearance Test Report by
Central Heating New Zealand.
3. There is a 750 mm clearance at the front
of the boiler for easy of service.
Figure 1

6
12
6.3 INSTALLATION - CONDENSATE DISPOSAL
CONDENSATE DISPOSAL
METHOD 1
CONDENSATE TRAP
IMPORTANT
Always prime condensate
trap with water.
Figure 1
Boiler
Sealed
Condensate Drain
Condensate Drain
Trap
Lime Stone
Chippings
Free Draining Soil
Soak Away
Figure 1
Boiler
Condensate Drain
Washing
Machine
Gully
Waste
Pipe
Trap
Figure 2
Boiler
Condensate Drain
Gully Trap
Figure 3
Boiler
Condensate drain
Stack
Trap
Discharge pipe
Condensate drain must have
a minimum diameter of 22mm
and it must be supported with
a 2.5˚ (1:100) fall from boiler.
Figure 4
Condensate drain baffle
Condensate drain float
Condensate baffle and condensate trap
Condensate trap
Condensate hose
Before switching on your
Firebird condensing oil boiler
check that:
(1) The float & condensate drain
baffle are in place.
(2) That the condensate trap
is primed.
(3) The condensate discharge
pipe is a corrosion
resistant pipe.
The condensate trap is located
at the base of the boiler.

6
13
6.3 INSTALLATION - CONDENSATE DISPOSAL
CONDENSATE DISPOSAL
METHOD 2 - CONDENSATE PUMP
IMPORTANT
Firebird condensing boilers when in condensing mode extract more heat from the flue products and the resulting
condensate which is mildly acidic needs to be drained from the boiler via a condensate pipe to the drainage system.
Provision must be made for the removal of condensate from the boiler to a internal soil stack, waste pipe,
external soil stack, gully or soak-away as per BS6798.
The 75mm trap is provided with the boiler and situated on the front of the boiler (under the cleaning door). This should
be checked at regular intervals and cleaned at annual service.
The condensate line should be plastic and minimum diameter of 22mm.
Copper or steel cannot be used.
A fall from the boiler of 1:100 minimum.
As few bends as possible to reduce the risk of trapping condensate.
CONDENSATE PIPEWORK THAT IS EXTERNAL OR IN AN UNHEATED GARAGE SHOULD NOT
EXCEED 3 METERS AND LAGGED WITH WATER PROOF INSULATION TO PREVENT FREEZING.
CONDENSATE PUMP (KIT IS AVAILABLE AS AN OPTIONAL EXTRA)
Condensate
pump wired
in to come
on with burner
Condensate
pump
Hose pipe
Out to drain
Inlet connected
to condensate drain
at base of boiler
must be into
a sealed pipe
Out
Inlet
Hose tail connection
Control panel
Brown
L2 L1
N
Stack
Ground level
To condensate pump
Condensate drain
From
condensate
pump to
drain
Boiler
10 mm Griflex tubing
discharge pipe
Condensate pump performance
Flow rate: 7.2 l/min
Lift: 5.m
Head: 8.m
Part Numbers
Condensate pump 111508
Hose tail connection 111510
Hose pipe 111509
 

6
14
6.4 INSTALLATION - SEALED SYSTEM HEATING CIRCUIT
When the system is cold and filled to initial fill pressure
Pithe pointer on the pressure gauge should point at 1
bar.
The pressure gauge shown has two red zones marked
on it. The first is between 0 and 1/2a Bar. If the pointer
falls into this zone when system and boiler are cold this
is indicating that initial System Fill Pressure has
dropped and this will activate the pressure switch
cutting off power supply to the Combi C. Refill system
manually until indicated pressure rises to 1 bar.
N.B. Insufficient pressure in the boiler will cause
power supply to switch off.
* A 12 litre expansion vessel is fitted to boiler,
precharged with air or nitrogen to 1 bar which allows
a system static head of 5 metres. If the static head is
greater than this then the air charge in the vessel must
be increased to balance the higher static head. The air
charge should not exceed a pressure of 1.5 bar.
If static head is altered then it is also necessary to alter
air charge pressure to equal static head (+ 0.3 Bar).This
is necessary in order to keep system water from
entering expansion vessel until system is being heated
and thus allow its maximum acceptance volume (V) to
be used only to accommodate the expansion of
system water during boiler operation.
Remember that air charge pressure must be equal in
both vessels (attached to the same system). In the
above example this is 1 bar. Air charge pressure is the
air pressure in expansion vessel before system is filled.
It is measured with a tyre gauge attached to Schrader
valve on the vessel.
N.B. The second red zone is between 21/2and 4 bar
pressure. When the heating system is up to full
working temperature, if the pointer on the
pressure gauge should enter this red zone
showing a final system design pressure of more
than 21/2bar, it is likely that:
(a) Total system water content is greater than
that calculated and if additional expansion
vessel has been fitted it should be replaced
with a larger unit
OR if integral boiler expansion vessel only is
used then an additional expansion vessel is
required.
SEALED HEATING CIRCUIT
The system must comply with BS 7074 Part 1 and BS
5449 Part 1 with a maximum water temperature of
80˚C.
* A manual reset overheat limit thermostat is located
at the rear of the electrical control panel. If a boiler
overheat condition arises the burner will stop and
remain inoperative until this thermostat reset
button is depressed.
* A pressure relief valve to BS 6759 operating at 3 bar
(45 lb/in2) is fitted. A discharge pipe of 15 mm
diameter is also fitted to the discharge connection
on the pressure relief valve. During installation an
extension pipe should be fitted to this, leading, to
outside the building.The pipe should be as short as
possible and may need a tundish fitted in a
protected position within the building.
Note:- Water must not discharge above an
entrance, window or where public have access.
The installer must be aware that the discharge
may be boiling water.
* A drain valve must be fitted at the lowest points in
the system to enable draining as necessary. A drain
valve is already fitted at the bottom of the boiler to
enable draining of boiler and tank unit only. All
pipes connected to boiler should have shut off
valves fitted to facilitate this.
* A Pressure gauge, having range 0 to 4 bar is fitted to
boiler control panel.This indicates water pressure in
boiler and system at time of reading. Pressure
when cold should be 1/2bar minimum to 1.5 bar
maximum. This is known as Initial System Design
Pressure (Pi).
N.B. Initial System Design Pressure (measured in
bar) equals static head of system (measured in bar)
plus 0.3.

6
15
6.4 INSTALLATION - SEALED SYSTEM HEATING CIRCUIT
(b) Static head may be higher than calculated. In
this case it is necessary to re-measure static
head and revise expansion vessel air charge
pressure.
(C) Expansion vessel incorrect size or air charge
pressure incorrect.
Refer to BS 7074
Part 1 and BS 5449 for further information.
Nearest available stock size for additional vessel
required, at 1 bar initial system pressure (taken from
above table) is 5 Litres.
It is emphasised that the installer should be fully
acquainted with sealed system installation and
operation, calculation of total system water volume,
determining of initial system pressure required and
calculation of any additional expansion vessel volume
required. Warranty is void when the boiler is
installed in a system with insufficient expansions.
NB. Ensue that all expansion vessels in the same
system are set at EQUAL air charge pressures.
SYSTEM FILLING, TESTING AND MAKE-UP
Introduction
Mains cold water is supplied through the boiler
drain/fill valve.
Heating Circuit
This is the radiator heating system including the boiler
which is filled from the mains supply via a flex filling
loop to a pressure determined from the system static
head, expansion vessel size and system water volume.
This flexible filling loop should be disconnected when
boiler and system are filled and checked (see method
B).
System filling should take place slowly and can
be completed via the following method:
Automatic Filling
Automatic System filling may be made with a feed and
make-up cistern connected through a double check
valve and stop valve assembly to the return side of the
heating system as close to the boiler as is practical.This
cistern should be located above the heating systems
highest point to give a minimum static head of 300 mm
between it (highest point) and cistern. The manual
filling system fitted to boiler should then be
disconnected and connection points blanked off.
This system has the advantage of automatic water
make-up in the event of system pressure loss due to air
elimination and minor leaks. In any case control panel
pressure gauge should be occasionally checked.
Safety Valve Setting 3 bar
Initial System Pressure 0.5 bar 1.0 bar 1.5 bar
Total Water Content TOTAL VESSEL
of System VOLUME **
Litres Litres Litres Litres
25 2.1 2.7 3.9
50 4.2 5.4 7.8
75 6.3 8.2 11.7
100 8.3 10.9 15.6
125 10.4 13.6 19.5
150 12.5 ->[16.3]<- 23.4
175 14.7 19.1 27.2
200 16.7 21.8 31.2
225 18.7 24.5 35.1
250 20.8 27.2 39.0
FOR FURTHER INFORMATION CONSULT
APPROPRIATE TRAINING MANUALS
AND BS 7074 PART 1, BS 5449, ETC
* * When calculating size of any additional
expansion vessel required, remember to deduct
the boiler expansion vessel volume of 12 litres
from the calculated total system vessel volume
required, as given in above table.
EXAMPLE: using above table
If total water content of system is - 150 litres
and initial system pressure required is - 1.0 bar
then vessel volume required is - 16.3 litres
[from above table]
The vessel supplied with boiler is - 12.0 litres
therefore an additional vessel of - 4.3 litres
is required (minimum)
(For this system of 150 litres - total water volume)
EXPANSION VESSEL AND SYSTEM
REQUIREMENTS
METHOD B

6
16
6.4 INSTALLATION - SEALED SYSTEM HEATING CIRCUIT
N.B. Remember also to check air fill pressure of
Expansion Vessel when system is cold
using standard tyre gauge connected to
Schrader air valve on vessel.
NOTE: There shall be no direct connection to the
mains, even with the use of a non-return
valve without the permission of Local
Water Authority.
* It is recommended that an inhibitor be added
at the time of final fill to protect the System
from corrosion. Ensure that this is carried out
in accordance with inhibitor manufacturers
instructions. Installer should ensure that
inhibitor used is suitable and that it will have
no adverse effect on Expansion Vessels
diaphragms or any other part or component
of the system.
COMMISSIONING
* Before proceeding to filling, ensure that
electricity supply is switched off at mains to
avoid any possibility of time switch operating
and passing power to appliance prior to filling.
Filling and Testing
Check that all connections, especially compression
joints, are fully tightened. Re-check and ensure that
pressure vessel air charge is correct, then fill system
with water via filling system used. Turn off water
supply before system pressure reaches safety valve
operation point of 3 bar. (Say 2 to 2.5 bar).Vent system
via all manual air vents including circulating pumps,
boiler, radiators,system high points. etc. Check that dust
caps are loosened on auto air vents, keep constant
check on system pressure gauge (fitted to control
panel). If pressure has dropped re-admit water to above
pressure. Ensure all appropriate boiler and system
valves are open.
With water supply turned off, thoroughly flush out
boiler and system to remove all foreign matter before
allowing boiler and pumps to operate. If in doubt drain
system and repeat above procedure. At this stage
flushing-out water should be clean and clear of all
foreign matter.
Refill the system and again vent at all points as
described above. Examine the complete system for
water leaks having pressurised it to 1 - 2.5 bar. Correct
any leaks, then check operation of safety valve by
admitting further water until this valve operates. This
should occur when system pressure rises to between
2.7 and 3.3 bar.When satisfied with valve operation, and
with mains water still turned off, draw off sufficient
water until initial system design fill pressure (Pi). (cold
fill) is established (0.5 - 1 bar - as calculated for system).
Remember that initial cold fill pressure can only be
checked when system water has properly cooled down.
Check that final operating pressure (Pf) is under 2.5
bar with all radiators turned on and up to highest
working temperature. Should system operating
pressure exceed this, check:
1. That initial cold fill pressure is correct and , if
additional expansion vessel is fitted, that
pressure is equal in each vessel.
2. That expansion vessels are sized correctly.
Special attention should be given to existing
heating systems where a Firebird boiler has
replaced an existing unit. Extra effort should be
made to ensure that all original pipe work and
radiators are repeatedly flushed. If possible use a
proprietary cleansing agent suitable for system as
loosened scale and foreign matter can seriously
reduce domestic hot water performance and pump
efficiency.
Use corrosion inhibitor of suitable type.

6
17
6.5 INSTALLATION - FLUE REGULATIONS
BALANCED FLUE SITING
Notes: 1. The terminal should be positioned to avoid combustion products entering
the building or accumulating in stagnant pockets around buildings.
2. The terminal must be protected by a guard if it is less than 2 metres above ground
level or in a position where any person has access to it (i.e. a balcony).
3. A heat protection shield should be fitted if the terminal is less than 850mm from
a plastic or painted gutter or less than 450mm from painted eaves.
4. Prevailing winds should be taken into account when siting a flue.
* FIREBIRD RECOMMENDS AS PER OFTEC RECOMMENDATIONS, THAT THE FLUE SHOULD
BE A MINIMUM DISTANCE OF 1 METRE FROM OPENINGS SO THAT IT DOES NOT
CAUSE A NUISANCE AND PERMITS THE DISPERSAL OF COMBUSTION PRODUCTS
(SEE PAGE 18).
ALWAYS CHECK FOR ANY BUILDING REGULATIONS AMENDMENTS WHICH MAY
HAVE BEEN ISSUED AFTER THE PUBLICATION OF THIS MANUAL
A
A
C
B
C
A. Horizontal from opening,
airbrick, opening window
etc.
B. From an internal or
external corner.
C. Below an opening,
airbrick, opening window
etc.
Book 3 2010
*Where the terminal is within 1 metre of any plastic material, such material should be protected from the
effects of combustion products of fuel. There are additional general requirements in most Regulations and
Standards that the flue must be positioned so that it does not cause a nuisance and permits the dispersal of
combustion products.
NOTE: The Building Regulations clearances shown above are the minimum allowed.To take account of
prevailing site conditions, it is advisable wherever necessary, to follow the manufacturer’s preferred
recommendation. If in doubt contact the manufacturer for advice.
See note at foot of page
Building Regulations
BUILDING REGULATIONS ABC
Northern Ireland 2000 600 600 600
Republic of Ireland 1997 600 600 600

6
18
6.5 INSTALLATION - FLUE REGULATIONS
A
G
E
B
C & D
K
F
F
L
N
O
P
H
J
Boundary
Boundary
F
Q
Q
QQ
Q
Q
Q
R
Clearances advised by BS 5410 Part 1: 2014
Regular Appliance (Open, Low Level Discharge and Balanced) Flue Termination Clearance
The basic requirement with regard to flue positioning is that no hazard or nuisance is caused by the flue gases.
Diagrams 20a and 20b show clearances advised by BS 5410 Part 1: 2014.
Regional requirements where flue clearances differ can be found in the
regional requirements section in OFTEC Book 3 2010
Pressure JetLocation
Appliance Burner Type
Condensing
A Directly below an opening, airbrick, opening window etc. 1000
B Horizontally to an opening, airbrick, opening window etc. 1000
C Below a gutter, eaves or balcony with protection 1000
D Below a gutter or a balcony without protection 1000
E From vertical sanitary pipe work 300
F From an internal or external corner or surface or boundary alongside the terminal 300
G Above ground or balcony level 300
H From a surface or a boundary facing the terminal 2500
J From a terminal facing the terminal 1200
K Vertically from a terminal on the same wall 1500
L Horizontally from a terminal on the same wall 750
M Above the highest point of an intersection with the roof 600
N From a vertical structure on the side of the terminal 750
O Above a vertical structure less than 750mm from the side of the terminal 600
P From a ridge terminal to a vertical structure on the roof 1500
Q Above or to the side of any opening on a flat or sloping roof 300
R Below any opening on a sloping roof 1000
Minimum distances to terminals in millimeters as measured from the top of the chimney
or the outer edge of where flue gases pass through low level discharge openings
SEE NEXT PAGE FOR IMPORTANT NOTES
Diagram 20a