TriStar OPTIMA 28 SB User manual

OPTIMA 28 CB AND 28 SB
WALL MOUNTED GAS BOILERS
INSTALLATION
INSTRUCTIONS

pag. 2
8 Control panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 17
8.1 Starting the appliance
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 17
8.2 Use of controls
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 17
8.3 Reading and setting boiler parameters
. . . . . . . . . . . . . . . . pag. 19
9 Operation with external probe
. . . . . . . . . . . . . . . . . . . . . . . . . . pag. 20
9.1 Installing and connecting external probe
. . . . . . . . . . . . . . . . pag. 20
9.2 Setting heating curve
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 20
9.3 Adjusting heating curve
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 20
10 Combustion analysis
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 21
10.1 Conversion from natural gas to propane
or viceversa (with KITGPL02)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 22
11 Adjusting maximum working capacity
of boiler in heating function
. . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 23
12 Checking boiler safety equipment
. . . . . . . . . . . . . . . . . . . . . . pag. 23
13 Useful tips
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 23
14 Temporary failure and blockage of appliance
. . . . . . . . . pag. 24
14.1 Identification codes of irregularities causing a
temporary failure or fault
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 24
14.2 List of fault codes
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 25
15 Examples of installation
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 26
16 Accessories
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 27
17 Periodic appliance maintenance and cleaning
. . . . . . . . . pag. 28
18 Short parts list
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 31
19 Balanced flue kits
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 33
1 Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 3
1.1 Use of anti-freeze liquid
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 4
1.2 Features under floor heating system
. . . . . . . . . . . . . . . . . . . pag. 4
1.3 Safety advice
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 4
2 General features
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 5
2.1 Winter operation
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 5
2.2 Summer operation (CB models)
. . . . . . . . . . . . . . . . . . . . . . . . pag. 5
2.3 Hard water areas
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 5
3 Technical features of the appliance
. . . . . . . . . . . . . . . . . . . pag. 6
3.1 Overall dimension and connections
. . . . . . . . . . . . . . . . . . . . . pag. 7
3.2 Hydraulic diagram
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 7
3.3 Features of circulator/generator load loss
. . . . . . . . . . . . . pag. 8
4 Unit assembly
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 8
4.1 Hydraulic connection
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 8
4.2 Flue system
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 9
5 Access to boiler
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 14
6 Electrical connections
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 15
7 Preliminary checks to be carried out before appliance
start-up
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 16
7.1 Loading the system
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 16
7.2 Starting the circulating pump
. . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 16
7.3 Checking system pressure and possible
water recovery
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 16

pag. 3
1 WARNINGS
This booklet, together with the user and service
manual should be kept by the user and must always
accompany the boiler even when passed on to ano-
ther owner or user and/or when transferred to ano-
ther system. Read the instructions and warnings in
this booklet and in the user manual carefully, as they
provide important directions for safe installation,
usage and maintenance.
- This boiler is used to heat water at a temperature lower
than boiling point at atmospheric pressure. It must be
connected to a heating system and/or a domestic hot
water system at the limits of its performance and its
power. Any other use of this boiler must be considered
incorrect and therefore hazardous.
- Installation, maintenance and repair must be carried out
by a CORGI Registered Installer 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 instruction is given refe-
rence should be made to the relevant BRISITH STAN-
DARDS CODES OF PRACTICE. For Ireland install in
accordance with IS 813 “Installation of Gas Appliance”
B.S. Codes of Practice
Standard Scope
BS 6891 Gas Installation
BS 5546 Installation of hot water supplies for
domestic purposes.
BS 5449 Part.1 Forced circulation hot water systems.
BS 6798 Installation of gas fired hot water boilers.
BS 5440 Part 1 Flues.
BS 5440 Part 2 Ventilation.
BS 7074 Expansion vessels and ancillary
equipment for sealed water systems.
BS 7593 Treatment of water in domestic hot water
centrai heating systems.
WARNING – The addition of anything that may interfere with
the normal operation of the appliance without the express
written permission of Trianco Ltd could invalidate the
appliance warranty and infringe the Gas Safety
(Installation and Use) Regulations.
Incorrect installation may cause harm to people, animals and pro-
perty. The manufacturer is not liable for damage caused by
incorrect installation and by non-observance of the instructions
accompanying the boiler
Installation, maintenance and any other operation must be carried
out in compliance of current regulations and instructions supplied
by the manufacturer.
Installation is the purchaser's responsibility.
The boiler is supplied in a carton pack; when it is removed, ensure
that the appliance is complete and that all the parts are supplied.
The packing components (clips, plastic bags, polystyrene foam,
etc) must be kept out of reach of children, since they are a hazard
for them.
The technical notes and instructions contained in this document
are to help fitters install the system correctly.
Any repair should be carried out using solely original spares and
operations involving the removal of the appliance must only be car-
ried out by qualified engineers. Failure to abide by the above
exempts the manufacturer from any liability and may jeopardise the
the safety of the unit.
It is forbidden to climb on to the unit.
INSTALLATION AND INITIAL START-UP OF THE BOILER MUST
BE CARRIED OUT BY QUALIFIED PERSONNEL, IN ACCOR-
DANCE WITH CURRENT NATIONAL REGULATIONS ON
INSTALLATION AND ANY DIRECTIONS FROM LOCAL AUTHO-
RITIES AND PUBLIC HEALTH BODIES.
When turning the boiler on or off, the fan may make a slightly lou-
der noise because of the rapid increase or reduction in the number
of rotations.
The expansions of the materials that make up the unit, due to rises
or falls in temperature, may cause slight tapping noises. This may
normally occur after the boiler is turned off or on.
An excessively high flow-rate of domestic hot water may cause a
slight noise in the circuit and a drop in temperature at the domestic
water outlet.

pag. 4
1.1 USE OF ANTIFREEZE LIQUID
1.2 FEATURES OF UNDER FLOOR
HEATING SYSTEMS
●If you smell gas:
- do not operate electrical appliances
- extinguish any fires
- close the stopcock upstream of the meter
- open the windows and ventilate the room
- call your local authorised engineer
●Do not store or use flammable materials near the boiler.
●Do not obstruct intake/exhaust terminals.
●To guarantee boiler efficiency and correct operation, it is
imperative to have yearly maintenance, and combustion
analysis every two years, carried out by qualified
engineers, and to have the system booklet prepared, as
stipulated by law.
●It is forbidden to touch the boiler either with bare feet
and/or with wet parts of the body.
●In order to clean the outside parts, turn off the boiler turn
off the power at the isolating switch. Clean with a damp
cloth. Do not use detergents and/or harsh liquids, or toxic
products.
●In order to carry out any work on the boiler, do not mount
it on chairs, stools, ladders or unstable stands.
●Before carrying out any work on the boiler always turn
the power off at the isolating switch
●The user is forbidden to carry out any maintenance work
on the boiler that must be carried out by a specialised
engineer.
●In the case of structural work or maintenance near the
pipes, flue systems or any accessories, switch off the
appliance and, when the work is completed, have the
system checked by a qualified engineer to ensure the
system is in good working order.
1.3 SAFETY ADVICE
In floor systems, the use of plastic pipes without
protection against penetration of oxygen through
the walls can cause corrosion of the system's
metal parts (metal piping, boiler, etc), the forma-
tion of oxides and bacterial agents.
To prevent this problem, it is necessary to use pipes with an
"oxygen-proof barrier", in accordance with standards DIN
4726/4729.
If pipes of this kind are not used, keep the system separa-
te by installing heat exchangers or those with a specific
system water treatment.
In floor systems, a system safety thermostat must
be installed to protect against overtemperature
calibrated at around 45°C (see wiring diagram on
page 14).
TRIANCO is not liable for damage caused to the unit or the
system due to failure to comply with the above.
If antifreeze substances are used in the
system, check carefully that they are compati-
ble with the aluminium that forms the body of
the boiler.
In particular, DO NOT USE ordinary ETHYLENE
GLYCOL, since it is corrosive in relation to aluminium
and its alloys, as well being toxic.
Trianco suggests the use of suitable antifreeze products
and in the correct dose, which will prevent rust and
incrustation taking place.
Periodically check the pH of the water-antifreeze mixtu-
re of the boiler circuit and replace it when the amount
measured is lower than the limit stipulated by the manu-
facturer.
DO NOT MIX DIFFERENT TYPES OF ANTIFREEZE
TRIANCO is not liable for damage caused to the boiler
or system as a result of the use of incorrect antifreeze or
additive substances.

pag. 5
The TriStar OPTIMA boiler is a sealed-type electronic
condensing gas wall mounted boiler with high seasonal
efficiency.
The burner, of premix type, guarantees high efficiencies
and safe combustion at all power ratings, with minimal
pollutant emissions.
The electronic board provides for a periodic selfdiagno-
stic of the functions, with indications of any irregularities
or failures by means of a code that appears on the con-
trol panel display.
It is simple to use and has fully automatic operation, and
thus user operations are reduced to the basic simple
operations.
The production of domestic hot water is always activa-
ted and has priority over the heating function.
The external temperature probe (OPTIMAZER) must be
fitted to ensure maximum running efficency.
The boiler is started and regulated automatically so as
to meet the requirement of the heating system.
With the outside temperature probe, the system’s water
temperature is regulated automatically according to the
heating curve set, guaranteeing maximum comfort in all
conditions.
DOMESTIC HOT WATER DRAW OFF (CB MOD.)
When calling for domestic hot water, the boiler, by
means of an appropriate sensor, automatically switches
over in order to guarantee supply of the correct amount
of water at the desired temperature.
Regulation of the domestic water temperature is also
carried out precisely and automatically by the boiler’s
electronics.
The domestic hot water comfort function is activated
automatically at the end of every withdrawal and gua-
rantees a quick response for subsequent withdrawals
for the programmed time.
2 GENERAL FEATURES
2.1 WINTER OPERATION
The boiler is started and regulated automatically so as
to meet the domestic water requirement.
Switching from summer to winter operation and vicever-
sa may be carried out by hand or automatically (if exter-
nal probe present) depending on the outside temperatu-
re set.
2.2 SUMMER OPERATION (CB MODELS)
If the boiler is to be installed in a area recognised for
having hard water, it is recommended that a suitable
water treatment device is installed in the mains supply
to the boiler.
The water hardness can be determined by using the
standard test paper or by contacting your local water
authority.
2.3 HARD WATER AREAS

pag. 6
3 TECHNICAL FEATURES OF THE APPLIANCE
Key to boiler models
CB = Combi Boiler
SB = System Boiler
Operating gas NAT. GAS (G20) LPG (G31)
OPTIMA model CB SB CB SB
Maximum heat output Qmax (80°/60°C) kW 28,0 28,0 28,0 28,0
Minimum heat output Qmin (80°/60°C) kW 5,6 5,6 7,3 7,3
Maximum heat output (50°/30°C) kW 29,7 29,7 29,7 29,7
Minimum heat output (50°/30°C) kW 6,1 6,1 8 8
Maximum heat range kW 28,7 28,7 28,7 28,7
Minimum heat range kW 5,7 5,7 7,5 7,5
Working efficiency at max output (80°/60°C) % 97,6 97,6 97,6 97,6
Working efficiency at max output (50°/30°C) % 103,5 103,5 103,5 103,5
Working efficiency at 30% max output (Average T=50°C) % 107,0 107,0 107,0 107,0
Working efficiency at min output (80°/60°C) % 98,2 98,2 97,3 97,3
Working efficiency at min output (50°/30°C) % 107,0 107,0 106,7 106,7
Flue losses with burner in operation % 2,1 2,1 2,1 2,1
Flue losses with burner extinguished % <0,1 <0,1 <0,1 <0,1
Shell losses % 0,3 0,3 0,3 0,3
Flue Gas temperature °C 73,0 73,0 73,0 73,0
%CO2 in dry fumes % vol 9,8 9,8 11,5 11,5
Class of NOx emissions (EN 483) Cl. 5 5 5 5
Combustion efficiency % 97,9 97,9 97,9 97,9
Flue Gas mass range at nominal capacity kg/h 43,5 43,5 43,5 43,5
Residual flue gas discharge head Pa 73 73 73 73
Gas consumption (15°C, 1013 mbar) m3/h 3,0 3,0 1,17 1,17
Max. production of condensation water l/h 2,4 2,4 2,4 2,4
Water content l 2,4 2,4 2,4 2,4
Available head (∆T=20°C) kPa 28 28 28 28
Max. operating pressure bar 3 3 3 3
Expansion vessel volume l 10 10 10 10
Expansion vessel preload press. bar 1 1 1 1
Nominal G20 natural gas press. mbar 20 20 -- --
Nominal G31 LPG gas press. mbar -- -- 37 37
Max. heating temperature °C 90 90 90 90
Min. heating temperature °C 20 20 20 20
Specific domestic water range (∆T=30°C) l/min 13,4 – 13,4 –
Max. domestic circuit pressure bar 8 – 8 –
Min.domestic water withdrawal l/min 2,3 – 2,3 –
Max. domestic hot water temperature °C 60 – 60 –
Min. domestic hot water temperature °C 30 – 30 –
Power supply V/Hz 230/50 230/50 230/50 230/50
Max. power consumed W 110 110 110 110
Degree of electrical protection IPX4D IPX4D IPX4D IPX4D
Weight kg 56,5 52 56,5 52
Noise at 1m at nominal capacity dB(A) 41,8 41,8 41,8 41,8
Appliance class ΙΙ 2H 3P
Appliance type B23, C13, C33, C43,C53, C83
Appliance CE Certificate No.

pag. 7
65
465
365
221 181
67 67 65
==
120
==
155
31*
175 (gas)
A
F
E
CGDB
890
827
HH
37545 45
*- posizione attacchi con
gruppo idraulico installato
bar
0
13
2
4
M
1
2
3
5
4
11
9
10
12
13
14
18
19
17
15
8
6
7
16
AC G D B
12
19
1
2
3
5
4
11
bar
0
13
2
4
10
9
16 13
17 8
6
7
AG D B
KEY:
1 - Burner
2 - Manual air valve
3 - Boiler shell
4 - Gas valve
5 - Boiler water pressure sensor
6 - Automatic air valve
7 - Pump
8 - Return temperature sensor
9 - Safety valve
10 - Pressure gauge
11 - Expansion vessel
12 - Drain tap
13 –System Filling Valve
14 - Domestic water pressure switch
15 - Domestic water temperature sensor
16 - Bypass
17 - Delivery temperature sensor
18 - Three-way valve
19 –Condensation Trap
A - Heating Flow
B - Domestic hot water Flow
C - Gas inlet
D - Domestic cold water inlet
E - Heating return
A - Heating delivery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3/4”
B - Heating Return . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3/4”
C - Domestic hot water flow** . . . . . . . . . . . . . . . . . . . . . . . 1/2”
D - Domestic cold water inlet ** . . . . . . . . . . . . . . . . . . . . . 1/2”
E - Precut for air intake pipe . . . . . . . . . . . . . . . . . . . . . . . . ø80 mm
F - Collar for concentric fume pipe . . . . . . . . . . . . . . . . . ø60/100mm
G - Gas Inlet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3/4”
H - Holes for mounting plate to wall . . . . . . . . . . . . . . . . ø8mm
** = present on CB models only
3.2 HYDRAULIC DIAGRAM
3.1 OVERALL DIMENSIONS AND CONNECTIONS
OPTIMA CB OPTIMA SB
fig. 3.1-1
fig. 3.2-1 fig. 3.2-2
* position of connections
with hydraulic unit installed

pag. 8
The boiler must be installed in
an accessible position that
complies with the dimensions
set out in the drawing below,
so as to make any mainte-
nance and cleaning opera-
tions easier.
For positioning use the tem-
plate included in the pack
and, with a spirit level check
the boiler is horizontal. Then
mark and drill the holes for
mounting the wall plate and
the hydraulic connections.
Then mark and drill the
holes for the boiler moun-
ting plate, insert appropriate
rawlplugs in them, fix the
plate in position and attach
the boiler to it.
Caution:
Before mounting the boi-
ler, remove rear cross
pieces shown in figure 4-
2.
For optimum performance after installation this Boiler and its
associated central heating system must be flushed in accor-
dance with the guidelines given in BS7593 “Treatment of
water in domestic hot water central heating systems. It is
also advisable to install suitable stop gate valves on the
systems delivery and return piping.
DIMA DI CARTONE
4.1 HYDRAULIC CONNECTION
3.3 FEATURES OF CIRCULATOR / GENERATOR
LOAD LOSS
4 UNIT ASSEMBLY
400
Caution: the pressure relief valve is set at 3 bar therefore all
pipework, fittings, etc. should be suitable for pressures in
excess of 3 bar.
The pressure relief discharge pipe should be not less than
15mm dia, run continuously downward and preferably over a
drain. It should be routed in such a manner that no hazard
occurs to occupants or causes damage to wiring or electrical
components. The end of the pipe should terminate facing
down and towards the wall.
The discharge must not be above a window, entrance or other
public access. Consideration must be given to the possibility
that boiling water / steam could discharge from the pipe.
For hydraulic connection of the boiler, use the equipment kit
and follow the directions given on the attached instruction
sheet.
The 10 Ltr expansion vessel supplied with the boiler is sui-
table for a system volume of approx. 140 Ltr.
An additional vessel will be required for system volumes
above this, following this formula:
V= 0,07 x C
V = Expansion vessel volume (Ltr)
C = Water system volume (Ltr)
fig. 4-1
fig. 4-2
fig. 4-3
0,0 0,4 0,8 1,2 1,6 2,0
Q [m
3
/h]
0
1
2
3
4
5
6
H
[m c.a.]
0
10
20
30
40
50
p
[kPa]
Prevalenza disponibile
all’impianto alla
massima velocita’del
circolatore
Area di lavoro del
circolatore
MAX
A
A
MIN
TECHNICAL FEATURES OF STANDARD CIRCULATOR INSTALLED
Capacity absorbed
max (W) min (W)
Maximum speed 91 73
Minimum speed 49 40
Note: Circulator speed is regulated automatically by boi-
ler control board
Head available to
system at maximum
circulator speed
Circulator working
area
TEMPLATE

pag. 9
A
M
B,C
D
E
F
R
G
J
K
H,I
L
Q
N
S
G
P
F
The following guidelines indicate the general require-
ments for siting balanced flue terminals.
Recommendations for flues are given in BS 5440
Pt.1.
If the terminal discharges onto a pathway or passage-
way, check that combustion products will not cause
a nuisance and that the terminal will not obstruct
the passageway.
If a terminal is less than 2 metres above a balcony,
above ground or above a flat roof to which people
have access, then a suitable terminal guard must
be provided.
4.2 FLUE SYSTEM
Terminal position with minimum distance mm
A Directly below an openable window, air vent
or any other ventilation opening. 300
B Below gutter, drain/soil pipe. 150
C Below eaves. 200
D Below a balcony/car port roof. 200
E From vertical drain pipes and soil pipes. 75
F From internal or external corners. 300
G Above adjacent ground or balcony level. 300
H From a surface facing a terminal. 600
I Facing a terminal. 1200
J From opening (door/window) in carport
into dwelling. 1200
K Vertically from a terminal on the same wall. 1500
L Horizontally from a terminal on the same wall. 300
M Above an opening, air brick, opening
window etc. 300
N Horizontally to an opening, air brick,
opening window etc. 300
Vertical Flues - minimum distance to edge
of terminal mm
P Above the roof level (to base of terminal). 300
Q From adjacent wall to flue. 300
R From adjacent opening window. 1000
S From another terminal. 600
Important: since the TRISTAR OPTIMA is a conden-
sing boiler, exhaust temperature is very low; therefore
it is normal for part of the residual water vapour in the
exhaust fumes to be capable of condensing in the flue
pipe
You are advised to pay attention to the following:
a - to the positioning of the exhaust terminals (they
may drip and also produce a ploom of condensa-
tion)
b - to the incline of the flue pipe so as to avoid con-
densation becoming stagnant;
c - to the correct positioning of the condensation col-
lection parts;
d - to connecting the condensation drain correctly.
The TRISTAR OPTIMA boiler is a type C certified
Appliance (sealed boiler).
Connection of the flue exhaust pipes is made accor-
ding to the diagrams attached.
For the parts to use, please refer to the TRIANCO
catalogue of boiler installation accessories.
IMPORTANT: As with all flues the kit must be installed
taking due account of the current issue of BS5440
parts 1 & 2 and timber frame housing REF
IGE/UP/7/1998.
Also note that the requirements will vary depending
upon the kit being installed. Guidance is provided but
unless otherwise stated, always comply with recom-
mendations of the relevant codes of practice.

pag. 10
REAR OUTLET
HORIZONTAL BALANCED FLUE
HIGH LEVEL HORIZONTAL BALANCED FLUE
765mm 30" MAX
315mm 12.5" MIN
175 MIN
4000mm (SEE NOTE)
MAX/MIN WALL THICKNESS IS WITH KIT SUPPLIED
EXTRA PIPES CAN BE PURCHASED TO EXTEND TO 4 MTRS
765mm 30" MAX
315mm 12.5" MIN
175 MIN
1095 MAX 4000 mm
MAX/MIN WALL THICKNESS AND HEIGHT IS WITH KIT SUPPLIED
EXTRA PIPES CAN BE PURCHASED TO EXTEND TO 4 MTRS
HORIZONTAL BALANCED FLUE KIT (SEE PAGE 32)
IMPORTANT: As with all flues the kit must be installed taking
due account of the current issue of BS 5440 parts 1 & 2 and tim-
ber frame housing REF IGE/UP/7/1998.
Also note that the requirements will vary depending upon the kit
being installed. Guidance is provided but unless otherwise sta-
ted, always comply with the recommendations of the relevant
codes of practice.
EXPOSED PIPE: any pipe exposed to the elements should be
protected with a suitable material, and maintained regularly.
Installing the Balanced Flue Kit
1 Having decided the position of the boiler, accurately mark
out the position of the terminal and boiler fixing holes using
the template provided. Cut a ø120mm hole through the wall
to accept the terminal, and drill 2 ø8mm holes to accept
rawlplugs and mounting bolts.
2 Fix the boiler to the wall using the wall-mounting bracket.
3 Pass the terminal through the wall, and fit the internal wall
seal to the terminal.
4 Fit the ø60mm (black) seal to the inner spigot on the boiler
flue off-take (Fig. 1).
5 Fit the ø100mm and Ø60mm (blue) seal into the 90°con-
centric bend.
6 Fit the 90°concentric bend into the boiler flue off-take, and
secure in position with clamp.
7 Slide the terminal into the 90°bend ensuring it is pushed
home firmly, and ensure wall seal is fitted against wall.
8 Fit the external wall seal to the terminal.
9 To extend the terminal length, use the 500mm concentric
pipe and cut to length, ensuring the inner is cut 20mm lon-
ger than the outer.
NOTE: For High Level Balanced flue Kit
1 Measure vertically 950mm (max) from position of the cut-
out on the template to give position of terminal required.
2 Cut the 1000mm concentric pipe to required length. Fit the
ø100mm and ø60mm (blue) seal into the pipe.
3 Fit the concentric pipe into the boiler flue off-take, and secu-
re in position with clamp.
4 Fit 90°concentric bend into pipe, and fit remaining compo-
nents as above.
IMPORTANT:
When installing the flue system, it is important that the flue
assembly inclines slightly up from the boiler. This will allow
any condensation formed to run back to the condense drain
BOILER OFF-TAKE INNER SPIGOT
ø60mm SEAL (BLACK)
Fig. 1

pag. 11
R/H SIDE OUTLET
HORIZONTAL BALANCED FLUE
HIGH LEVEL HORIZONTAL BALANCED FLUE
MAX/MIN WALL THICKNESS IS WITH KIT SUPPLIED
EXTRA PIPES CAN BE PURCHASED TO EXTEND TO 4 MTRS
687mm 34" MAX
417mm 16.5" MIN
4000mm (SEE NOTE)
175 MIN
765mm 30" MAX
315mm 12.5" MIN
175 MIN
1095 MAX 4000 mm
MAX/MIN WALL THICKNESS AND HEIGHT IS WITH KIT SUPPLIED
EXTRA PIPES CAN BE PURCHASED TO EXTEND TO 4 MTRS
L/H SIDE OUTLET
HORIZONTAL BALANCED FLUE
HIGH LEVEL HORIZONTAL BALANCED FLUE
MAX/MIN WALL THICKNESS IS WITH KIT SUPPLIED
EXTRA PIPES CAN BE PURCHASED TO EXTEND TO 4 MTRS
650mm 25.5" MAX
437mm 17" MIN
4000mm (SEE NOTE)
175 MIN
437mm 17" MAX
175 MIN
1095 MAX
4000 mm
MAX/MIN WALL THICKNESS IS WITH KIT SUPPLIED
EXTRA PIPES CAN BE PURCHASED TO EXTEND TO 4 MTRS
Note:
500mm Extension
pipe must be
used for left-hand
side
Note:
500mm Extension
pipe must be
used for left-hand
side

pag. 12
VERTICAL BALANCED FLUE
6000mm MAX
VERTICAL BALANCED FLUE KIT (SEE PAGE 32)
Installing the Balanced Flue Kit
1 Having decided the position of the boiler, accurately mark
out the position of the boiler fixing holes using the template
provided. Drill 2 Ø8mm holes to accept rawlplugs and
mounting bolts.
2 Cut a Ø150mm hole in the ceiling and roof.
3 Determine the flue length required, ensuring the maximum
permissible flue length is not exceeded. If it is necessary to
cut one of the pipes to achieve the required ensure the inner
is cut 20mm longer than the outer, and both inner and outer
are de-burred.
4 Fit Ø60mm (black) seal to the inner spigot on the boiler flue
off-take (Fig. 1).
5 Fit the Ø100mm and Ø60mm (blue) seal into the concentric
flue pipes.
6 If possible, pre-assemble the entire flue on a flat surface,
ensuring all sections are pushed firmly home. Secure bot-
tom section to boiler with clamp.
7 Fit a roof flashing sleeve to the roof (not supplied), and
insert Vertical Flue Terminal through flashing from the outsi-
de.
8 Starting at the appliance end assemble the extension pipes,
ensuring each joint is pushed firmly home. Ensure none of
the flue joints are situated within the joist space.
9 Fit ceiling plate centrally around pipe, ensuring that the
outer flue pipe has a minimum clearance of 25mm from any
combustible material. Pack space with glass fibre insulation.
10 Fit wall clamp around terminal and secure to roof member,
ensure weight of terminal is carried by the wall clamp and
not the roof flashing sleeve.
11 Ensure flue is adequately supported.
IMPORTANT: FLUE SEALING
TO FIT FLUE PIPES TOGETHER, IT IS ESSENTIAL TO
APPLY A THIN BEAD OF LUBRICANT (E.G. WASHING UP
LIQUID, VASELINE) AROUND ALL RUBBER SEALING
RINGS.
AS THE FLUE SYSTEM OPERATES UNDER POSITIVE
PRESSURE, IT IS ESSENTIAL TO ACHIEVE A TOTAL SEAL
ON ALL FLUE JOINTS.

pag. 13
AB
C
D
A+B = 2500mm MAX
C+D = 4000mm MAX
NOTE:
For each additional elbow reduce straight lengths by
the relevant elbow dimension 90°1500mm and 45°
750mm
90°BEND = 1000mm
45°BEND = 750mm

pag. 14
In order to access the electrical panel, proceed as
follows:
- disconnect voltage to appliance
- open boiler front control panel cover
- remove upper screws A from front cover
- gently lift cover and pull towards you.
- remove screws V1 and V2 that secure control
panel (fig 5-2)
- Lower the control panel until it stops approxima-
tely 45°
- - To unlock it and bring it down completely, lift up
front control panel cover until it is supported on
control panel and lower them both together (fig.
5-3)
5 ACCESS TO ELECTRICAL PANEL FOR CON-
NECTING ADDITIONAL UNITS
CONTROL
PANEL
BOILER
CONTROL
PANEL COVER
fig. 5-2
fig. 5-3
V2 V1
fig. 5-1
In order to connect any external controls and wire the
controls into the specific terminals on terminal board M
(fig. 5-5).
The wires must pass under panel P and retained using
cable clips F.
fig. 5-4
H
F
P
F
M
fig. 5-5
To wire in any external valves it is necessary to gain
access to the inside of the control panel. To do this,
remove rear screws C and take off protection panel P.
For electrical assembly and connection, follow the
directions given on the instruction sheets attached
fig. 5-6

pag. 15
After having fixed the boiler to the wall and connected all the
hydraulic connections from the system, make the electrical
connections.
To gain access to the board, follow the directions in paragraph
5, “Access to boiler”, pass all electrical cables through one of
the cable ducts.
For related connections to the board, consult the wiring dia-
gram below.
IMPORTANT:
In connecting the appliance to the mains, strictly obser-
ve the phase-neutral polarity stated in the diagram.
Electrical wiring to the boiler must be in accordance with
current I E E wiring regulations.
NOTE The method of connection to the electricity supply
must facilitate complete electrical isolation of the
appliance.
Connection may be via a fused double-pole isolator with
a contact separation of at least 3mm in all poles and ser-
vicing the boiler and system controls only.
In the event of replacement, use a cable with the same
features as that fitted (section 3 x 0.75 - maximum exter-
nal ø8mm)
X50 X40
X30
X15
X14X13X12X11
X10
X3 X2 X1
Boiler pump
230 VAC
Diverting valve
230 VAC
Configurable connection (230 VAC)
Ionisation probe
Gas valve mains
gas 230 VAC
Ignition
electrode
Ignition
transformer
230 VAC
AC 24V
Transformer
Fan motor
2
3
1
2
3
1
4
2
3
1
4
5
2
3
1
4
5
6
2
3
1
4
5
6
7
8
9
10
11
12
earth
Fuse
electrical supply
~ 230V 50 Hz
high-temp. safety
therostat
for floor heating
N
L
N
M
N
L
N
L
230V 24V
GND
HALL
+UB
PWM
heating
BROWN
WHITE
BLACK/RED
Domestic Hot water
1
2
3
L
N
USER
INTERFACE
BOILER BOARD
AGU 2.303A153
LMU 54.030A153
❶= Accessories available on request
To be fitted by the installer
main
switch
L
N
L
N
Warning: respect the in-
dicated polarity pha-
se/neutral when connec-
ting the mains
To be fitted only with
floor heating
X10-01 X10-02 X10-03 X10-04 X10-05 X10-06
X3-01X3-02X3-03X3-04 X 2-0 1X2-02X2-03X2-04X2-05
12121212311212121
212121212121
X1-01X1-02
12312
DHW pressure
switch (CB model)
or DHW tank
thermostat (SB model)
DHW tank thermostat
(SB model)
DHW temperature
probe (CB model)
Return flow temp. probe
Boiler temp. probe
Room
thermostat
Programmer
QAA73
DHW tank
NTC temperature
sensor
❶
P
P
External probe
QAC34/101
❶
❶
❶
CR TA SB SE TB
PWM boiler
pump
Avaiable only for SB models
Warning: they cannot be used
at the same time
*
*
*
6 ELECTRICAL CONNECTIONS
fig. 6-1

pag. 16
Before starting the boiler, check that:
- the gas line is not closed upstream of the appliance;
- the gas and water stopcocks are open;
- the appliance has been correctly connected to the
mains electricity and in such a way that the phase-
neutral polarity is observed;
- the system has been correctly filled with water (see
point 7.1).
In order to fill the system, gain access to the inside of
the sealed chamber, loosen the automatic escape
valve cap on the automatic air vent (fig. 7.1-1) and
screw V of the manual escape cock on the top of the
exchanger (fig.7.1-2) and gradually open the filling
valve tap.
The boiler operates correctly at a water pressure bet-
ween 1 and 1.5 bar this should be checked on the
pressure gauge located on the lower side of the boiler.
Once all the air has been vented from the system,
close the escape cocks and, when the desired pres-
sure has been reached, close the filling valve tap.
Control pressure gauge
manual air vent
automatic air vent
7.1 LOADING THE SYSTEM
7 PRELIMINARY CHECKS TO BE CARRIED
OUT BEFORE APPLIANCE START-UP
The water pressure is checked periodically on the
pressure gauge described in paragraph 7.1.
In order to reset the pressure to within the preset
values, gradually open the filling valve; when the desi-
red pressure has been reached, close the tap.
If, during normal operation, the appliance
frequently looses pressure or the boiler
safety valve comes into operation, con-
sult your installer or service engineer.
7.3 CHECKING SYSTEM PRESSURE AND POSSI-
BLE WATER RECOVERY
On initial start-up, the pump may be slightly noisy.
This may be caused by a small amount of air still trap-
ped in the pump. In order to let it out, proceed as fol-
lows:
- Loosen cap A (adjacent fig.) and
let out any air present.
- fasten cap A.
If pump not turning:
- remove screw A
- attempt to turn rotator knob using the
device on the shaft, taking care not to apply exces-
sive force so as not to damage it
- replace cap A checking that there are no water los-
ses
Before proceeding, take suitable precau-
tions to avoid possible scalds from hot
water and risks of damage to compo-
nents due to water losses from pump.
7.2 STARTING THE CIRCULATING PUMP
A
fig. 7.1-2fig. 7.1-1
fig. 7.1-4
fig. 7.2-1

pag. 17
Press switch A: the switch pilot light
and the display will go on; after a few
seconds the boiler is ready for ope-
ration.
The boiler temperature appears on
the display.
HEATING TEMPERATURE REGULATION KNOB (B)
When the heating is activated, with
this knob the heating circuit water
temperature is set.
The figure set is displayed for a few
seconds directly on the display,
after which the boiler temperature
reappears.
If the external probe is fitted, by operating knob B the
calculated ambient temperature is displayed for a few
seconds, after which the boiler temperature reap-
pears.
DOMESTIC HOT WATER TEMPERATURE REGULATION KNOB (C)
For models CB and for the SB ones
with a boiler unit with NTC sensor
connected, domestic hot production
is always activated.
The figure set is displayed for a few
seconds directly on the display, after
which the boiler temperature reap-
pears.
In model SB used for heating only, regulation has no
effect.
Note: The settings made with knobs B and C
(Heating and domestic hot water temperatures)
remain unchanged even after power supply fai-
lure.
MODE BUTTON
The MODE button makes it possi-
ble to switch from summer to winter
operation, and viceversa.
Pressing the button activates or
deactivates the heating indicated by
the LED F going on.
If the external temperature probe is connected to the
boiler, switching from winter operation (heating + dome-
stic hot water) to summer operation (domestic hot
water) is made automatically when the outside tempe-
rature is higher than 20°C.
A
B
C
Mode
Auto
F
8 CONTROL PANEL
A - On/off switch
B - Heating temperature setting control knob
C - Domestic hot water temperature setting
control knob
D - MODE button
E - Boiler automatic operation indicator LED
F - Heating operation indicator LED
G - RESET button
H - Burner operation indicator LED
I - Fault alarm LED
L - SELECT button
M -Boiler temperature reading indicator LED
N - Boiler operating/diagnostic phase reading
indicator LED
O - MAINTENANCE button
P - Display
°C
bar
Reset
Select
Mode
Auto
A
O
D
L
G
H
I
M
N
E
F
P
BC
8.1 STARTING THE APPLIANCE
8.2 USE OF THE CONTROLS
fig. 8-1
fig. 8.1-1
fig. 8.2-1
fig. 8.2-2
fig. 8.2-3

pag. 18
In this case the LED AUTO lights up, while the LED F, if
lit, indicates winter operation; if not lit, it indicates sum-
mer operation. In the case where you wish to deactiva-
te automatic switching, press the MODE button (the
LED AUTO goes out).
SELECT BUTTON
When in operating phase, the
digital display indicates the
boiler delivery temperature
(LED °C lit and continuous).
As well as this, by repeatedly
pressing the SELECT button, the following can be dis-
played in rotation:
1 - reading of domestic hot water temperature (flas-
hing LED °C)
2-–.–
3- boiler operating phase reading (LEDS °C and bar
off); at that moment the active phase is shown by
codes that have the following meanings:
0 - pause, no heat request
10 - system heating mode
11 - domestic hot water production mode
4 - Fault code or information on boiler operating sta-
tus (alternating flashing between LEDS °C and
bar).
By pressing the SELECT button once again, the dis-
play returns to reading 1; in all cases, after some
minutes the boiler temperature display is reset.
RESET BUTTON (RESETTING THE APPLIANCE)
After an operating irregularity,
the boiler stops for safety rea-
sons (fault: the red LED I goes
on). To reset the operation,
action must be taken by hol-
ding down the fault RESET button for around 2
seconds.
If the fault has to be checked again, check that the gas
stopcock and those possibly fitted on the heating deli-
very and return pipes and domestic water inlet and
outlet pipes are open and that the boiler water pressu-
re is correct; if the fault persists, call your installer or
service engineer.
°C
bar
Select
MAINTENANCE BUTTON
The maintenance button is
used by the maintenance
engineer to perform the cali-
bration and required for cor-
rect operation of the appliance and UNDER NO CIR-
CUMSTANCES MUST IT BE OPERATED BY THE
USER.
If it is accidentally pressed, do not press any other but-
ton and switch off and relight the boiler using button A.
Further uses of the maintenance button are described
in paragraphs 10 and 12.
Reset
H
I
fig. 8.2-4
fig. 8.2-5
fig. 8.2-6

pag. 19
In order to read and set the values of some boiler
parameters the SELECT button is used. By keeping it
pressed, a series of letters (A, b, C, d and P) appear
in rotation on the display.
By releasing the button when the letter appears and
pressing it again briefly the desired parameter is acti-
vated (a number appears to the right of the letter).
In order to return the display to standard parameter (1)
(boiler delivery temperature), enable parameter 1.
After approximately 8 minutes from the last operation
performed. The display will return to parameter 1.
The series of parameters which can be accessed are
as follows:
One letter only:
A1 - letter of boiler delivery temperature (°C)
A2 - letter of domestic hot water temperature (°C)
A3 - not used
A4 - letter of boiler operating phase
A0 - Technical value according to programming of the
board
b1 - letter of boiler return temperature (°C)
b2 - not used
b3 - not used
b4 - letter of outside temperature (°C)
b5 - not used
b6 - not used
b7 - second zone circuit temperature (°C)
C1 - letter of ionisation current value (µA)
C2 - letter of number of fan revolutions (thousands
and hundreds)
C3 - fan PWM (%)
C4 - letter of boiler relative heat output value (%)
C5 - not used
C6 - not used
d1 - Setpoint calculated on basis of operation in
domestic hot water or heating
d2 - value of calculated temperature of boiler
delivery (°C)
d3 - Display of value of ambient temperature set (°C);
If external probe is not present, value is fixed at
20°C.
d4 - setting of value of domestic hot water temperatu-
re (°C)
d5 - not used
d6 - maximum fan speed in heating function
Parameters that can be set:
In order to alter the value of the parameter, use at the
buttons SELECT (to increase it) and MAINTENANCE
(to decrease it). In order to store the new value in the
memory, hold down the SELECT button until the dis-
play value flashes twice, and then release the button.
P3 - not used
P4 - not used
P5 - Value of slope of heating curve
P6 -Value of parallel shift of heating curve
8.3 READING AND SETTING BOILER
PARAMETERS

pag. 20
9 EXTERNAL PROBE
9.1 INSTALLING AND CONNECTING
EXTERNAL PROBE
9.2 SETTING HEATING CURVE
9.3 ADJUSTING HEATING CURVE SET
When the external probe is used, the electronic board
calculates the boiler delivery temperature according to
the outside temperature.
The ratio of these temperatures is summarised in the
diagram in figure 9.2-1.
THIS MUST BE FITTED OTHERWISE BOILER WILL NOT PERFORM
AT THE MAXIMUM EFFICENCY.
The most suitable curve should be chosen according
to the design temperature and the type of building.
To set a new curve (see “parameters that can be set”
in paragraph above):
- access parameter P5
- set the preselected value
- store to set value in memory
To mount the external probe:
- remove protective cover as
shown here
- insert probe cable through
hole intended to be used. We
recommend mounting a rubber
cable duct if the rear route is
used (see ref. 1), a suitable
cable holder if the lower one is
used (see ref. 2); cable duct
and cable holder are not sup-
plied.
.
If solution 2 is used, remove
the lower section the protecti-
ve cover.
- connect the wires to the probe
and the boiler following the
wiring diagram on page 14.
20
-20 -15 -10 -5 0 5 10 15 20
30
40
50
60
70
80
90
2
n
4
6
8
10
12
14
16
18
20
Temperatura esterna mediata (°C)
Valore della pendenza della curva di riscaldamento
Curve di riscaldamento
Valore della pendenza della curva di riscaldamento
impostato in fabbrica= 15
24
22 28 32 36 40
25
1
2
3
H
1/2 H
min. 2,5 m
In order to adjust the heating curve, parameter P6 is
used. In this mode, the heating curve is shifted in
parallel so as to change the delivery temperature cal-
culated (see example in fig. 9.2-2).
To set the shift, proceed as follows (see “parameters
that can be set”in paragraph above):
- access parameter P6
- set preselected value
- store set value in memory
fig. 9.1-1
fig. 9.1-2
fig. 9.1-3
fig. 9.2-1
DO NOT INSTALL EXTER-
NAL PROBE IN POSI-
TIONS INDICATED
BELOW:
CORRECT INSTALLATION POSITION:
PROBE SHOULD BE INSTALLED ON
A NORTH ORNORTH EAST FACING
WALL AND SHELTERED FROM THE
EFFECT OF THE SUN’S RAYS AND
FROM OTHER HEAT SOURCES
value of slope of heating curve
heating curve
Factory-set value of slope of heating curve = 15
Mean outside temperature (°C)
Calculated flow temperature (°C)