Ferroli DOMINA N 80 DGT Manual

Appr. nr. B97.09 A - CE 0063 AT 4967
DOMINA N 80 DGT
INSTALLATION, SERVICE AND USER
INSTRUCTIONS
G.C. NO: 47-267-23
Copper Wall-Mounted Combination,
Gas Fired Boiler for Central Heating
andDomestic Hot Water Production,
Fan Assisted,Room Sealed Compartment,
Electronic Flame Ignition andControl
3543832/1 - 07/2001

DOMINA N 80 DGT
2
CE MARK
CE mark documents that the Ferroli gas appliances comply with the requirement contained in
European directives applicable to them.
In particular, the appliances comply with the following CEE directives and the technical specifications
provided from them:
• Gas appliances directive 90/396
• Efficiencies directive 92/42
• Low tension directive 73/23 (modified from the 93/68)
• Electromagnetic compatibility directive 89/396 (modified from the 93/68)
Year 2000 Compliance Declaration
We will guarantee that this products is altogether suitable for the data change in the Year 2000
(boiler has no dependence from date change) and that no disruptions will occur which is caused
by this product.
IMPORTANT
Your"benchmark" Installation,CommissioningandService RecordLogBookwill beenclosed
in yourcustomer information pack.
"Thisrecordmustbecompletedandleftwiththeenduser"
"All CORGI RegisteredInstallerscarryaCORGI IDcardandhavearegistration number.Both
shouldberecordedin yourcentral heatinglogbook. Youcan checkto theCORGI registered
by callingCORGI on 01256 372300".
Ferroli is a member of the Benchmark initiative and fully supports the aims of the programme. Benchmark
has been introduced to improve the standards of installation and commissioning of central heating
systems in the UK and to encourage the regular servicing of all central heating systems to ensure safety
and efficiency. Please see installation and servicing guidelines.
INDEX1
1 DESCRIPTION 3
TECHNICAL AND DIMENSIONAL CHARACTERISTICS
3INSTALLATIN DETAILS
COMMISSIONIN AND TESTIN 7
ADUSTMENT AND ASCONVERSION 8
MAINTENANCE AND CLEANIN 30
7REPLACEMENTPARTS 3
8AULTINDIN 37
ELECTRICAL AND NCTINAL SCHEME
10USERINSTRCTINS

DOMINA N 80 DGT
3
1 DESCRIPTION
1.01 Introduction
The DominaN80 DGT is definedas a“room sealed” combination boiler, all air requiredfor combustion is takenfrom
outside the room in which it is installed. It is anewhigh performance gas firedheat generator for central heating and
domestic hot waterproduction. Aspecial feature of this boileris its built-in electronic flame ignition and control unit
making burneroperation completely automatic and safe.The main components are as follows:
•Copperheat exchangerconsisting of three finnedtubesspecifically shapedfor high efficiency.
•There are three coppercoils insertedin the three heating circuit tubes. These represent the domestic
hot waterheat exchanger. Their shape and high exchange surface areaenable the full output of the
boilerto be absorbed.
•Ceramic fibre insulatedcombustion chamber
•12 stainless steelbladedburners specifically designedfor this boiler.
•Fan for discharge of combustion products and intake of combustion air.
•Differential air pressure switch.For safety reasons, this ensuresthe burnerignitesonly whenthe fan is functioning correctly.
•Hermetically sealedcompartment made from corrosion-resistant steelenclosing the above components.
•Combination gas safety valve with modulator, complete with pressure stabiliser.
•Flowmetergiving the domestic hot watercircuit precedence overthe central heating circuit.
•Pressure reliefvalve for the central heating circuit setto openat 3bar.
•Built-in Expansion vessel.
•Variable speedpump.
•Central heating flow temperature adjustment thermostat.
•Domestic hot waterflow temperature adjustment thermostat.
•Central heating limit thermostat.
•Overheat safety thermostat.
•Electronic control unit for automatic flame ignition and control.
•Central heating low waterpressure cut off switch.
•Domestic hot waterflow temperature sensor.
•Central heating flow temperature sensor.
1.02Instructionsand regulations
Assembly, installation, first start up and maintenance must be carriedout by competent persons only, in accordance
with all current technical regulations and directives.
OSHH
Materials usedin the manufacture of this appliance are non hazardous and no special precautions are
requiredwhenservicing.
Related Documents
Thisappliancemust beinstalled strictlyin accordancewiththese instructions.
The Gas Safety Regulations (Installations &Use)1996.
The Local Building Regulations.
The Building Regulations.
The Buildings Standards (Scotland -Consolidated)Regulations.
British Standards Codesof Practice:
B.S.75931992TREATMENT OF WATERINDOMESTIC HOT WATERCENTRALHEATING SYSTEMS
B.S.5546 1990 INSTALLATIONOF HOT WATERSUPPLIESFORDOMESTIC PURPOSES
B.S.5440 Part 12000 FLUES
B.S.5440 Part 21989 AIRSUPPLY
B.S.5449 1990 FORCED CIRCULATIONHOT WATERSYSTEMS
B.S.6798 1987 INSTALLATIONOF GASFIRED HOT WATERBOILERS
B.S.68911989 GASINSTALLATIONS
B.S.76711992IEE WIRING REGULATIONS
B.S.48141990 SPECIFICATIONFOREXPANSIONVESSELS
B.S.54821994 INSTALLATIONOF LPG
ModelWaterBye Laws
For Northern Ireland the rulesin force apply

DOMINA N 80 DGT
4
Fig. 1
Top view
Distance between connections
178
190 270 272
760
249
98
609536 60 95
Bottom view
460
100
727
114
160100 25 150 25
84
80 80
12070 120 150
110
5
34
2
1
2 TECHNICALANDDIMENSIONAL CHARACTERISTICS
2.01 Technical information
Domina N 80 DGT boilers are central heating and domestic hot water heat generators and are produced
as standard to function with natural gas or Liquid Petrolium Gas converted appliances.
Key
1 -3/4"central heating flow outlet
2-1/2"domestichot water flow outlet
3-1/2“gasinlet
4-1/2"domestichot water inlet
5-3/4"central heating return inlet

DOMINA N 80 DGT
5
N.B. - The gas pressures at the burner and gas flows during the central heating phase given in the table refer
to nominal boiler output.To reduce this output (where necessary), gas pressure must be reduced untilthe
required output levelis reached (see figures 4and 5).
During domestic hotwater production,gas pressures to the burner must correspondtothe maximum
outputgiven in table forthe type ofgas.
Gas pressure must beadjustedduring maximum draw-off ofdomestic hotwater.
•Maximum working temperature forcentral heating flow:85°C
•Maximum temperature ofdomestic hotwater:55°C, adjustable between 40°C and55°C.
•Minimum domestic coldwater pressure requiredfor95% heat input:
- Flowrestrictorfitted(standard)- 1,2 bar;
- Flowrestrictorremoved- 0,5 bar
MODEL Heat output Heat input
Domestic hot
water heat
input
Boiler water
contents Domestic hot water contents
kW kW kW kW kW Litres Litres
Domina N 80 DGT 23,8 9,7 25,8 11,5 23,8 1,5 0,8
MODEL
Connections Expansion vessel
Max. working
pressure
central
heating
circuit
Max.
working
pressure hot
water circuit
12345Capacity Pre-pressurising
value
ØØØØØLitres bar bar bar
Domina N 80 DGT 3/4” 1/2” 1/2” 1/2” 3/4” 7 1 3 6
MODEL
Main injectors (mm) Gas flow rates to main burners
for central heating Gas valve
Ø1/2
G20 - NG G31 -LPG G20 - NG G31 -LPG
ØØ m
3
/h kg/h
Domina N 80 DGT 12x1,30 12x0,77 2,73 2,00 H. V K4105G
MODEL
Gas supply pressures
working Gas pressure at main burner for central heating
Safety valve
G20 G31 G20 G31
min. m min. m
mbar mbar mbar mbar mbar mbar bar
Domina N 80 DGT 20 37 2,5 11,8 7,8 36,0
MODEL
Domestic hot
water production
with ∆t 30 °C
Domestic hot
water production
with ∆t 35 °C
Max. working
pressure domestic
hot water Protection
level
Weight
G20 G31
l/min. l/min. mbar mbar kg
Domina N 80 DGT 11,3 9,7 11,8 36,0 IP44 38
TechnicalData

DOMINA N 80 DGT
6
2.03 Boiler water flow diagram
OUT
I
MIN
AIR
IN
AIR
IN
FLUE
OUT
C.H.
OUT D.H.W. OUT GAS IN D.H.W. IN C.H. IN
Fig. 3
2.02 Boiler maincomponents
Key
5 Room sealed compartment
7Gas inlet
8Domestichot water outlet
9Domestichot water inlet
10 Central heating flowoutlet
11 Central heating return inlet
14Safetyvalve
16Fan
19Combustion chamber
20Burner assembly
21Maininjector
22 Burner
26Combustion chamber insulation
27Copper heat exchanger for central heating
and domestichot water
28Fluecollector from heat exchanger
32Central heating pump
34Central heating flowtemperature sensor
36Automaticairvent valve
42Domestichot water flow
temperature sensor
Fig. 2
43
16
27
50
19
49
28
5
20
21
26
132
90 91
818222
56
IN OUT
MIN
10 874 784 85 44 136
32
36
114
34
14 42 9 11
145 62
43Airpressure switch
44 Gas valve
49Safetyoverheat thermostat
50Central heating flowlimitthermostat
56Expansion vessel
62Time clock(option)
81Ignition electrode
82Sensor electrode
84Primarygas valvesolenoid
85Secondarygas valvesolenoid
90*Fluesampling point
91*Airsampling point
98On/Off/Reset switch
114Lowwater pressure cutoff switch
132Fluegas deflector
136Flowmeter
145 Central heating pressure gauge
*For use withfluegas analysisequipment

DOMINA N 80 DGT
7
2.04 Central heating adjustment (not normally required)
To adjust boiler heat input (thusalso regulatingheat output to the central heatingwater) simply adjust the main
burner via the electroniccontrol board (fig. 4and 5and see paragraph 5.04 page 29).
The diagramsindicate the variation in heat output to the water asburner workingpressure isvaried.
Adjustingboiler output to the actual requirementsofthe central heatingsystem will minimise boiler cyclingthussaving
fuel,varyingthe output hasvirtually no effect on the efficiency and combustion characteristics ofthe boiler.
Diagram of pressures
and outputs with Natural gas
Fig. 4 Fig. 5
Diagram of pressures and outputs
with LPG (Propane)
2
3
4
5
6
7
8
9
10
11
12
13
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
8 9 10 11 12 13 14 15 16 17 18 19 20 21
kW
kcal/h
x1000
mbar
14
kW
kcal/h
X1000
m
b
ar
18 19 20 21 22 23
5
10
15
20
25
30
35
91011121314151617
91011121314 18192015 16 178
2.05Domestichot water variabilitycharacteristics
The temperature ofthe domestichot water can
be varied from 40 to 55°C by adjustingthe boiler
potentiometer.
Diagram of domestichot water production
0 345678910111213141516
39
40
45
50
55
60
65
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
Temperature of domestichot water intake 15°C
Flow of domestichot water l/min
Temperature of domestichot water supply°C
Boiler output exchanged kcal/1000
Fig. 6

DOMINA N 80 DGT
8
Fig. 8
Pressure loss diagram
SIZING OF ADDITIONAL EX PANSION VESSELS:
Deduct from the value given in the table the 8 litre
vessel supplied.
Note:
1. Fill C.H. installation to min. 1.5bar.
2.Expansion vessel must be fitted to central
heating return pipe.
3.The standard 7litre expansion vessel is
charged to 1bar.
4.The additional expansion vessel should be
charged to 1bar.
SAFETYVALVE
SETTING (bar)
VESSEL CHARGE
PRESSURE(bar)
INITIAL SYSTEM
PRESSURE(bar)
TOTAL WATER
CONTENT ofSYSTEM
3.0
0.51.01.5
1.01.52.01.52.02.0
EX PANSION VESSEL VOLUME(litres)
LITRES
253.56.513.74.710.38.3
507.012.927.59.520.616.5
7510.519.441.314.230.924.8
100 14.025.955.119.041.233.1
12517.532.468.923.751.541.3
15021.038.8 82.628.561.8 49.6
17524.545.396.433.272.157.9
200 28.051.8 110.238.082.466.2
0.1400.2590.551 0.1900.4120.33
For syst.volumes other than
those givenabove,mult.the syst.
volume bythe factor across
m |h
3
Q
8
7
6
5
4
3
2
1
00.5 1.5 2.512
Hmbar x 100
2.06 Pumpcharacteristics
The pump head available for circulating the water is given
in fig. 7.
N.B.-The pump is factoryset at position 3. The pump is a
Grundfos type 15-50UPSseries.
Grundfos Pumpper formance graph
Note -Minimum flowthrough boiler heat exchanger at any
time should not fall below6litres per minute.
If the total volume of water in the system exceeds 40litres
an additional expansion vessel must be fitted to the central
heating return pipe.
Fig. 7
1 2 3 Speed settings
ABoilerspressuredrop
BAvailablepumpheadC.H.

DOMINA N 80 DGT
9
3 INSTALLATION DETAILS
Gas Safety (Installation & Use) Regulations: 1996
In the interest of safety, it is the lawthat all gas appliances are installedby a competent person in accordance
with the above Regulations, BuildingRegulations/BuildingStandards Scotland, Codes of Practice, current I.E.E.
Regulations andthe byelaws of the LocalWater Undertaking. Failure to comply withthe Regulations may leadto
prosecution;it is yourresponsibility to ensure that the lawis compliedwith.
N.B.For Northern Irelandthe rules in force apply.
Important -If the boiler is to be fittedin a timber framedbuildingit should be fittedin accordance with the Institute of
Gas Engineers document IGE/UP/7.If in doubt advice should be sought fromthe LocalSupplier.
Location of Boiler
The installation of the Domina N80 DGTmust be on a suitable non-combustible loadbearingwall which
will provide an adequate fixingfor the boiler mountingbracket assembly.The location should be in an
area where the water pipes will not be subjectedto frost conditions.In sitingthe combination boiler the
followinglimitations must be observed:
The combination boiler may be installedin any roomor internalspace, although particular attention is drawn
to the requirements of the current I.E.E. wiringregulations andin Scotlandthe electricalprovisions of the
buildingregulations applicable in Scotland, with respect to the installation of the combination boiler in a room
or internalspace containinga bath or shower.
Where a roomsealedappliance is installedin a roomcontaininga bath or shower any electricalswitch
or appliance controlutilisingmains electricity must be situatedso that it cannot be touchedby a person
usingthe bath or shower.
AirSupply
The roomor compartment in which the boiler is installeddoes not require a purpose providedvent when
usingthe standardconcentricflue.
Flue System
The boiler allows the flue outlet to be taken fromthe rear of the boiler, fromeither side or vertically.
Astandardflue length of 0.75metres is provided. Alternative lengths of two or three metres can be supplied
(equivalent to wall thicknesses of up to 565, 1815 and2815mm for rear flues, deduct 91mm plus distance fromside
wall for side outlet flues).It is absolutely essential, to ensure that products of combustion discharging fromthe
terminal cannot re-enterthe building,orenterany adjacent building,throughventilations,windows,doors,
natural airinfiltration orforcedventilation/airconditioning.
Gas Supply
If necessary the localGas supplier should be consulted, at the installation planningstage, in order to establish
the availability of an adequate supply of gas.
An existingservice pipe must not be usedwithout prior consultation with the LocalGas supplier.
Agas meter can only be connectedby the LocalGas supplier, or by a LocalGas suppliers Contractor.
Installation pipes should be fittedin accordance with BS6891-1988.
Appliance inlet workingpressure must be 20mbar MINIMUM, for NGand37mbar minimum for LPG.
Pipeworkfromthe meter to the combination boiler must be of an adequate size.
The boiler requires 2.73m3/h of naturalgas, and2,00 kg/h of LPG.
Do not use pipes of a smaller size than the combination boiler inlet gas connection.
The complete installation must be testedfor gas soundness andpurgedas describedin BS6981-1988.All pipework
must be adequately supported. An isolatinggas valve is providedandshould be fittedon the boiler gas inlet.
Please wait 10minutes when lightingfromcold before checkinggas rate.Gas pressures shouldbe checkedafter
the boilerhas operatedfor10minutes to reachthermal equilibrium.
WaterSystem
Note -the boileris designedforsealedsystems only andmust NOT be usedon open ventedsystems.

DOMINA N 80 DGT
10
NOTE: A bypass that will ensure a minimum flow rate of
6 l/min. at all all time must be fitted as far as possible
from the boiler if thermostatic radiator valves are fitted
thoughout.
Fig. 9
Central Heating
Detailed recommendations are given in BS6798, BS5449, BS6700 and CP342 Part 2. Pipeworknot forming part of
the useful heating surface should be insulated to prevent any heat losses or possible freezing (i.e. in roof spaces
or ventilated underfloor spaces). Drain taps should be positioned at the lowest point of the system in accessible
locations to permit the whole system to be drained down. The drain taps should be in accordance with
BS2879. Copper tubing to BS2871, Part 1is recommended for water carrying pipework. Pipeworkin
horizontal runs should have a gradient where possible to facilitate the removal of air. Ensure that the
boiler heat exchanger is not a natural point for air collection. A typical heating system with domestic
hot water circuit is illustrated in fig. 9.
Important -If thermostatic radiator vales are fitted a bypass must be fittedtoensure a minimumflowrate through
the boiler of6l/min. The bypass should be fitted as far as possible from the boiler.
Make UpWater
Provision must be made for replacing water lost from the sealed system. Reference should be made to BS6798,
for methods of filling and making up sealed systems. There must be no direct connection between the boiler's
central heating system and the mains water supply. The use of mains water to charge and pressurise the system
directly,is conditional upon the Local Water Byelaws. Again any such connection must be disconnected after use.
A typical temporary filling loop is shown in fig. 10.
DomesticHot Water
Always fit a scale reducer in "hard water areas"(18 clarke degrees or over)". A 15mm copper connection point
on the boiler for attaching to the main supply is provided. The maximum domestic water pressure for the
inlet supply is 10 bar (145 P.S.I.). Ifthe coldmainssupplyexceeds 5bar (72 P.S.I.), a water governor
or pressure reducing valve must be fittedby the installer into the mains supply in an inconspicuous but
accessible position preferable between 3and 5metres (10-16ft)before the appliance. Such a valve must
be approved by the Water Research Council.
Attention -is drawn to the Model Water Byelaws.
Fittings manufactured from duplex(alpha-beta)brass are not acceptable for underground use and certain water
undertakings will not accept their use above ground.
Ensure all pipeworkis adequately supported
Gas
Cold water Additional expansion
vessel C.H.
Filling
point C.H.
Bypass
Fig. 10
Key
1. Filling point C.H.
2. Temporary connection
3.Coldwater supply

DOMINA N 80 DGT
11
CLEARANCES:
* 600mm minimum clearance for servicing access
Top clearance only applies to 100Ø concentric
flue system
460 5 min.5 min.
100 min.900
200 min.
272 50 mm
600* min.
760
Fig. 11
Terminal Position
Fig. 12
P
D, E
Q
Q
l
BC
A
G
F
L
J
HH
K
N
N
MM
Q
Directly below an opening, air brick, (0-7 kW)
opening windows, etc. (>7-14 kW)
(>14-32 kW)
(>32-70 kW)
Above an opening, air brick, (0-7 kW)
opening windows, etc. (>7-14 kW)
(>14-32 kW)
(>32-70 kW)
Horizontally to an opening, air brick, (0-7 kW)
opening windows, etc. (>7-14 kW)
(>14-32 kW)
(>32-70 kW)
Below gutters, soil pipes or drain pipes
Below eaves
Below balconies or car port roof
From a vertical drain pipe or soil pipe
From an internal or external corner
Above ground roof or balcony level
From a surface facing the terminal
(also see 6.1.2)
From a terminal facing the terminal
From an opening in the car port ( e.g. door,
window) into the dwelling
Vertically from a terminal on the same wall
Horizontally from a terminal on the same wall
From the wall on which the terminal is mounted
From a vertical structure on the roof
Above intersection with roof
Dimensions Terminal position
(kW input expressed in net)
Balanced flues room
sealed Open flues
Natural
draught Natural draught
Fanned
draught Fanned draught
Aa300 mm
600 mm
1500 mm
2000 mm
300 mm Not allowed 300 mm
Ba300 mm
300 mm
300 mm
600 mm
300 mm Not allowed 300 mm
Ca300 mm
400 mm
600 mm
600 mm
300 mm Not allowed 300 mm
D300 mm 75 mm Not allowed 75 mm
E300 mm 200 mm Not allowed 200 mm
F600 mm 200 mm Not allowed 200 mm
G300 mm 150 mmbNot allowed 150 mm
H600 mm 300 mm Not allowed 200 mm
I300 mm 300 mm Not allowed 300 mm
J600 mm 600 mm N/A 600 mm
K600 mm 1200 mm N/A 1200 mm
L1200 mm 1200 mm N/A 1200 mm
M1500 mm 1500 mm N/A 1500 mm
N300 mm 300 mm N/A 300 mm
ON/A N/A N/A 50 mm
PN/A N/A See Table 2
and Fig. 6b N/A
QN/A N/A See Table 2
and Fig. 4 150 mm
NOTE N/A = Not applicable
aIn addition, the terminal should not be nearer than 150 mm (fanned draucht) or 300 mm (natural draught) to an opening in the building fabric formed for the purpose of accommodating
a built-in element such as a window frame, (see Figure C2). Separation distances are linked to the rated heat inputs as shown.
bThis dimension may be reduced to 75 mm for appliances of up to 5 kW heat input.
Minimum dimensions offlue terminal positions

DOMINA N 80 DGT
12
3.01 Boiler Mounting Plate
149
178
131
Fig. 13

DOMINA N 80 DGT
13
3.02 Drilling Template (Standard Rear Flue Application)
Select suitable mounting position for
boiler, using the template mark flue outlet
and boiler mounting points. Drill two
10mm holes 90mm deep to accept the
wall plugs, fit wall plugs. Fit two special
wall plugs on the wall as described in the
fig. 14a. Fasten the wall bracket to the
wall using an antitheft nut on the right
side and a standard nut (M8) on the
left side. Mount the boiler on the wall
bracket and fix using an antitheft nut on
the left side and a standard nut (M8) on
the right side.
Using a core drill cut a 118mm diameter
hole for the flue.
1. CH flow
2.Safety Valve
3.Domestic hotwateroutlet
4.Gassupply
5.Domestic hotwaterinlet
6.CH return
932 min
178200 min
5 min
125 min280
254.5
295.5 min
21 min
Ø118
183 min
270
Ø 3/4" Ø 1/2" Ø 1/2" Ø 1/2" Ø 1/2" Ø 3/4"
123 4 5 6
Fig. 14b
Fig. 14a

DOMINA N 80 DGT
14
3.03 Drilling Template (Top Flue Application)
Select suitable mounting position for
boiler, using the template mark flue outlet
and boiler mounting points. Drill two
10mm holes 90mm deep to accept the
wall plugs, fit wall plugs. Fit two special
wall plugs on the wall as described in the
fig. 14a. Fasten the wall bracket to the
wall using an antitheft nut on the right
side and a standard nut (M8) on the left
side. Mount the boiler on the wall bracket
and fix using an antitheft nut on the
left side and a standard nut (M8) on the
right side. Using a core drill cut a 118mm
diameter hole for the flue.
1. CH flow
2.Safety Valve
3.Domestic hotwateroutlet
4.Gassupply
5.Domestic hotwaterinlet
6.CH return
Fig. 15b
Ø3/4" Ø1/2" Ø1/2" Ø1/2" Ø1/2" Ø3/4"
200
Ø118
150 min
65
21 min
5 min
183 min
295.5 min
200 min
932 min
269
110
12345 6
Fig. 15a

DOMINA N 80 DGT
15
3.04 Back flue outlet (Diagram 1-9)
Fig. 16a Fig. 16bFig. 16c
1. Core drill 127mm hole (5"). 2.Push through the outer flue. 3. Gentlypull back until wall seal
isflush with the wall.
Fig. 16d
4. Place wall plate onouter flue
ensuringi ti slevel. Markand drill
four holes,two top,for expan-
dingbolts and two bottom for
plugs and screws. Fixplate to
wall with the square gasket
betweenthe wall and the plate
use the large diameter washers
for the bolts and screws.
Square GasketCircular Gasket
Fig. 16e
5.Through plate into air tube,
drill two holesand fixinplace
usingtwo selftappingscrews
M4x6mm long.
6.Cut the outer flue flush with the
flange onthe hangingplate.
Fig. 16f
7.Insertthe aluminium flue pipe
into white plasticouter flue,
makingsure the aluminium pipe
sits fullyand centrallyinto the
flueterminal. Markthe aluminium
flue pipe atthe pointitisflush
with the mountingplate. Add
36mm to thismarkand cut the
aluminium inner flue pipe at
thispoint.
Fig. 16g
36 mm

DOMINA N 80 DGT
16
Fig. 17c Fig. 17dFig. 17e
Remove fan by pulling off electrical connections. Pull
off air pressure switch tubes from the air pressure
switch remove 2 screws b. Rotate the fan upward to
disengage it from the securing pin a.
Fig. 17aFig. 17b
3.05 Domina top outlet flue conversion
Remove the securing screw that locates the fan
nozzle extension to the fan and remove the nozzle
extension and jointing mastic (this is not required
for top outlet flueing).
Fig. 16hFig. 16i
8.Install the inner metal flue into the outlet,up to
the wallplate flange mark.
9.Lift boiler with flue in place,engage inner and
outer flue,slide into position
9.Make sure the inner flue is fully engaged in
the flue terminal,secure boiler with two nuts
and washers,sevure bottom of boiler using two
screws and washers.
b
b
1
2a
Take off the four screws which fixthe top sealed chamber cover,remove the cover and gasket. Rotate
the cover and gasket through 90° and fit it to the rear of the boiler to cover the original flue outlet.
Secure them both in place with the four screws removed previously.

DOMINA N 80 DGT
17
Fig. 17fFig. 17g Fig. 17h
Remove fan mounting plate by undoing the three fixing screws c. Rotate the fan through 90° so that the fan nozzle
points upward. Secure the fan to the plate in the new position using screws in position d.
c
d
c
d
d
-
c
Common
For rear outlet
For upper outlet
For rear
outlet
c
c
c
d
dd
For upper
outlet
e
Fittheconnectoretothe fan nozzle.
Ensure the seals are in place
Fig. 17i
b
b
a
Fix with the screws (b). Refit wiring connections to fan and air pressure
switch tubes ensuring correct orientation. I.E. red tube to air pressure
switch connection with red dot (+) and clear tube to air pressure switch
connection with no paint marking (-).
Fit the fan into the boiler rotating the front upwards to engage with the
pin a. Secure with the screws b.
Fig. 17lFig. 17m
e
f
Fig. 17n
Fig. 17o
Rotate the fan connector e until it
locates into the stop then secure
it with the screw f.
Side concentric outlet
Fig. 17p
Vertical concentric outlet
Fig. 17q

DOMINA N 80 DGT
18
3.06 Restrictor
For boiler operation, the restrictor supplied with the unit must be mounted following the instructions below.
Determine the correct size of flue restrictor required. Before inserting the flue gas duct in the boiler, check that
the restrictor fitted is correct and that it is correctly positioned (see fig. 18).
Holes Ø : 45 47 50
Ø
Fig. 18
CHOICE OF RESTRICTOR:
RESTRICTOR FOR TWO PIPE SYSTEM
Total flow resistance
of flue system
Use
restrictor
size
minimum maximum mm
0 m 13 m 45
13 m 23 m 47
23 m 38 m 50
38 m 48 m No restrictor
•With concentric systems:
-Choose correct restrictor from table below.
•With 2pipe system:
-Calculate the total flow resistance of the air and
flue pipes in metres (cap. 3.08.2)
-utilise the table shown below to choose the more
suitable restrictor for the flow resistance calculated
RESTRICTOR FOR CONCENTRIC SYSTEM
Flue lenght up to:
Use
restrictor
size
Concentric
60 / 100
1 bend + 1 meter 50 mm
1 bend + 3 meters No restrictor
Concentric
80 / 125
1 bend + 3 meters 45 mm
1 bend + 4 meters 50 mm
1 bend + 5 meters No restrictor
N.B.:the diameter ofthe hole is
stampedonthe restrictor
No restrictor is requiredfor
backoutlet flue

DOMINA N 80 DGT
19
3.07 Top Outlet Concentric Flue Connection
3.07.1 Vertical concentric connection
Fig. 20
A vertical connector can be supplied for vertical
discharge with concentric pipes.
The simple mounting and use of double lip gaskets
at the joints makes this an extremely easy and safe
option.
For flue length up to 1 m long the 50 mmØ restrictor is
required. Longer than this no restrictor is required.
Fig. 19
Concentric
Vertical
Connector
3.07.2Horizontal concentric connection
A 90°bend (fig. 20)is supplied for the horizontal connection of air and flue gas pipes. This can be oriented
towards the chosen wall in degrees of 45°.
1KWMA31Y
DS
L
125
70
50*
30
95
80
80 -3 mm/m
Ø60 Ø80
70 min.
* = between 10 e 60 mm
190 270
L=S=D=255

DOMINA N 80 DGT
20
Fig. 21
Notes on concentric horizontal installation
To locate the centre of the hole for passing the
pipes through the wall, refer to fig. 15. Bear in
mind that the two concentric pipes must slope
downwards away from the boiler at a rate of
about 3 mm/m to avoid rainwater entering the
boiler. The concentric pipes making up the air
- flue gas duct must be sealed with the gasket
where they join the boiler (fig. 21). Outside, the
pipes should protrude from the wall between 10
and 60 mm (fig. 21).
Between
10-60mm
3.07.3 Maximum concentric flue length
First table below shows the maximum flue lengths available for boilers with concentric systems.
For correct calculation remember to include the reduction for bends on second table. Please refer to
3.06 for use of restrictor
Maximum flue lenght permissible 100 mm concentric 125 mm concentric
Vertical Horizontal* Vertical Horizontal*
Domina N 80 DGT m4m3m5m5
Reduction for bend
100 mm concentric bend 90°1 m
100 mm concentric bend 45°0,5 m
125 mm concentric bend 90°0,5 m
125 mm concentric bend 45°0,25 m
*For horizontal Flueingthe reduction for appliance bendor turret are already included.
max. 3 m
concentric
100/60
max. 4 m
concentric
100/60
Fig. 22aFig. 22b