4
4
23
4.2 sliMline CoMBi - installeR guiDelines
Please note the following important points before
commencing installation.
installation should only be carried out by a competent,
qualified engineer, preferably oFteC registered and
familiar with the installation of the Firebird boilers
referred to in this manual.
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.
Positioning tHe BoileR
Compliance guide to part L now states that when installing
a boiler on a new or existing system, the system should
be cleaned, flushed and then protected with a suitable
protection inhibitor.
Ensure that adequate clearance is available for making the
water and flue connections.
The boiler is serviced from the front and a clearance of
750mm must be available at the front of the boiler.
No special hearth is required as the boiler is fully insulated,
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
condensing liquid fuel boilers are one of the quietest boilers
on the market, some householders are particularly sensitive.
a suitable corrosion inhibitor must be added to the
heating system.
unDeRFlooR Heating
The boiler should not be directly connected to underfloor
heating, as a minimum return temperature of 40˚C is
required (it can be used with underfloor heating with
adequate temperature controls to ensure return values are
as stated above).
PlastiC PiPing
The boiler thermostat control and safety system is not
designed, and must not be relied on, to protect plastic pipe
from overheating. Plastic pipe must never be connected
directly to the boiler and there must be at least 1 meter
of copper pipe between the boiler and the first plastic
connection. If you choose to use plastic pipe anywhere
on your heating circuits, please consult the plastic pipe
manufacturer for their instruction on how to ensure their
product never overheats. Our boiler control and safety high
limit thermostats are not designed to fulfil this function.
Firebird accepts no responsibility for failure of plastic
piping and fittings for whatever reason.
PRessuRiseD Heating systeM
The maximum operating working pressure is 2 bar when the
system is at full operating temperature.
MagnetiC FiltRation
It is recommended at the time of installation of this boiler,
to install a permanent effective magnetic filter on the return
pipework after the last radiator on the central heating
system. This will maintain maximum operational efficiency
and protect the boiler from the damaging, long-term effects
of “magnetite” (black iron sludge). It is essential that the filter
is sized similar to the return pipework. The magnetic filter
must be installed in accordance with the manufacturer’s
instructions and serviced annually.
HaRD WateR - liMesCale
On initial fill, where it is suspected that there is a high
concentration of scale products, a suitable inhibitor must
be used to protect the boiler and system. Check with local
water authorities if in doubt (max. 200 ppm).
PiPeWoRK
Do not obstruct flue fitting with Pipework.
Connect pipework as shown below.
Manual air vent
Pressure relief
valve
Automatic air vent
DHW flow
CH flow
CH return
Mains inlet
Filling loop
valves
DHW adjustable
mixing valve
Filling tHe systeM
The unit comes with a factory fitted expansion vessel.
Should the total water volume of the system exceed the
expansion provided, a second vessel should be added (see
below table).
expansion vessel and system Requirements
Safety Valve Setting
3 bar
Initial System Pressure
0.5 bar
1.0 bar
1.5 bar
Total Water Content
of System
Total Vessel 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, BS 7074-1: 1989, EN 12828: 2012 + A1: 2014 AND ANy OTHER
RELEVANT STANDARDS & REGULATIONS.
* * When calculating the size of any additional expansion
vessel, remember to deduct the boiler expansion vessel volume
of 12 litres from the calculated total system vessel volume
required, as given in the above table.
