Ferroli TEMPRA 24 Manual

Appr. nr. B99.04 A - CE 0461 bl 0520
TEMPRA 24
INSTALLATION, SERVICE AND USER
INSTRUCTIONS
Copper Wall-Mounted System,
Gas Fired Boiler for Central Heating ,
Fan Assisted, Room Sealed Compartment,
Electronic Flame Ignition and Control
cod. 3543821/1 - 03/2004

TEMPRA 24
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)
IMPORTANT
Your "benchmark" Installation, Commissioning and Service Record Log Book will be enclosed in
your customer information pack.
"This record must be completed and left with the end user"
"All CORGI Registered Installers carry a CORGI ID card and have a registration number. Both
should be recorded in your central heating log book. You can check with the CORGI register by
calling CORGI 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.
INDEX
1. DESCRIPTION....................................................................................................................................................... 3
2. TECHNICAL AND DIMENSIONAL CHARACTERISTICS......................................................................................4
3. INSTALLATION DETAILS ...................................................................................................................................... 9
4. COMMISSIONING AND TESTING..................................................................................................................... 28
5. ADJUSTMENT AND GAS CONVERSION .......................................................................................................... 29
6. MAINTENANCE AND CLEANING .................................................................................................................... 31
7. REPLACEMENT OF PARTS................................................................................................................................. 33
8. FAULT FINDING.................................................................................................................................................. 37
9. ELECTRICAL AND FUNCTIONAL SCHEME ...................................................................................................... 39
10. USER INSTRUCTIONS ...................................................................................................................................... 41

TEMPRA 24
3
1. DESCRIPTION
1.01 Introduction
The Tempra 24 is defined as a “room sealed” boiler, all air required for combustion is taken from outside the
room in which it is installed. It is a new high performance gas fired heat generator for central heating. A special
feature of this boiler is its built-in electronic flame ignition and control unit making burner operation completely
automatic and safe. The main components are as follows:
• Copper heat exchanger consisting of four finned tubes specifically shaped for high efficiency.
• Ceramic fibre insulated combustion chamber
• 12 stainless steel bladed burners specifically designed for this boiler.
• Fan for discharge of combustion products and intake of combustion air.
• Differential air pressure switch. For safety reasons, this ensures the burner ignites only when the fan
is functioning correctly.
• Hermetically sealed compartment made from corrosion-resistant steel enclosing the above components.
• Combination gas safety valve with modulator, complete with pressure stabiliser.
• Pressure relief valve for the central heating circuit set to open at 3 bar.
• Built-in Expansion vessel.
• Variable speed pump.
• Central heating flow temperature adjustment thermostat.
• Central heating limit thermostat.
• Overheat safety thermostat.
• Electronic control unit for automatic flame ignition and control.
• Central heating flow temperature sensor.
1.02 Instructions and regulations
Assembly, installation, first start up and maintenance must be carried out by competent persons only, in accordance
with all current technical regulations and directives.
c.o.s.h.h.
Materials used in the manufacture of this appliance are non hazardous and no special precautions are
required when servicing.
3Related Documents
Related documents
This appliance must be installed strictly in accordance with these instructions.
The Gas Safety Regulations (Installations & Use).
The Local Building Regulations.
The Building Regulations.
The Buildings Standards (Scotland - Consolidated) Regulations.
British Standards Codes of Practice:
B.S. 7593 TREATMENT OF WATER IN DOMESTIC HOT WATER CENTRAL HEATING SYSTEMS
B.S. 5546 INSTALLATION OF HOT WATER SUPPLIES FOR DOMESTIC PURPOSES
B.S. 5440 Part 1 FLUES
B.S. 5440 Part 2 AIR SUPPLY
B.S. 5449 FORCED CIRCULATION HOT WATER SYSTEMS
B.S. 6798 INSTALLATION OF GAS FIRED HOT WATER BOILERS
B.S. 6891 GAS INSTALLATIONS
B.S. 7671 IEE WIRING REGULATIONS
B.S. 4814 SPECIFICATION FOR EXPANSION VESSELS
B.S. 5482 INSTALLATION OF LPG
Model Water Bye Laws
For Northern Ireland the rules in force apply

TEMPRA 24
4
Fig. 1
2. TECHNICAL AND DIMENSIONAL CHARACTERISTICS
2.01 Technical information
Tempra 24 boilers are central heating generators and are produced as standard to function with natural gas
or Liquid Petrolium Gas converted appliances.
98
15536 155
460
100 25 150
272
25 160
9836 155 114
760
706
965
175
190
155
70 120 120 150
110
Ø80Ø80 Ø80
114
3
2
1
Key
1. Central Heating flow
2. Gas supply
3. Central Heating return

TEMPRA 24
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 until the
required output level is reached (see figures 4 and 5).
•Maximum working temperature for central heating flow: 85°C
Technical Data
Gas supply
Pmax Pmin
Nominal Heat Input (Net)
Nominal Heat Output
Output
Pmax Pmin
kW 23,3 9,7
kW 25,8 11,2
Dimensions, weights, fittings
Depth mm 272
Width mm 460
Height mm 760
Hot water capacity litres 1,5
Expansion vessel pre-fill pressure bar 1
Expansion vessel capacity litres 8
Minimum central heating operating pressure bar 0,8
Maximum central heating operating pressure bar 3
Maximum central heating operating temperature °C90
Index of protection IP 44
Power supply
Power supply voltage/frequency V/Hz 230/50
Max Power Absorbed W 125
C.H. return (with isolation valve fitted) mm 22
C.H. flow (with isolation valve fitted) mm 22
Gas system fittings (with isolation valve fitted) mm 22
Weight with packaging kg 35
Central heating
Natural gas rate (G20) nm3/h 2,73 1,19
Main injectors, Natural Gas (G20) mm 12 x 1.3
Burner pressure, Natural Gas (G20) mbar 11,8 2,5
Supply pressure, Natural Gas (G20) mbar 20,0
LPG gas rate (G31) kg/h 2,00 0,87
Main injectors, LPG (G31) mm 12 x 0.77
Burner pressure, LPG (G31) mbar 36,0 7,0
Supply pressure, LPG (G31) mbar 36,0
Safety valve bar 3

TEMPRA 24
6
2.03 Boiler water flow diagram
Fig. 3
2.02 Boiler main components
Fig. 2
+
-
43
49 50
56
81
44
32
20
82
5
29-187
16
10 7 11
14
34
Key
5 Room sealed compartment
7 Gas inlet
10 Central heating flow
11 Central heating return
14 Safety valve
16 Fan
19 Combustion chamber
20 Burner assembly
21 Main injector
22 Burner
26 Combustion chamber insulation
27 Copper heat exchanger
28 Flue collector from heat exchanger
29 Internal flue exit
32 Central heating pump
34 Central heating flow temperature sensor
36 Automatic air vent valve
43 Air pressure switch
44 Gas valve
49 Safety overheat thermostat
50 Central heating flow limit thermostat
56 Expansion vessel
62 Time clock (option)
63 Central heating temperature adjustment
81 Ignition electrode
82 Sensor electrode
84 Primary gas valve solenoid
85 Secondary gas valve solenoid
98 On/Off/Reset switch
145 Central heating pressure gauge
187 Flue restrictor
RESET
OFF
ON
0
5
1
234
6
bar
98 63 145
1174485841410
34
20
21
22 82 81
49
28
5
29 187 43
56
16
27
50
19
26
36
32
62
°C

TEMPRA 24
7
2.04 Central heating adjustment (not normally required)
To adjust boiler heat input (thus also regulating heat output to the central heating water) simply adjust the main
burner via the electronic control board (fig. 4 and see paragraph 5.04).
The diagrams indicate the variation in heat output to the water as burner working pressure is varied.
Adjusting boiler output to the actual requirements of the central heating system will minimise boiler
cycling thus saving fuel, varying the output has virtually no effect on the efficiency and combustion
characteristics of the boiler.
Diagram of pressures and outputs with Natural gas
and with LPG (Propane)
Fig. 4
kW
kcal/h
X 1000
m
b
ar
18 19 20 21 22 23
5
10
15
20
25
30
35
9 1011121314151617
91011121314 18192015 16 178
G31
G20

TEMPRA 24
8
Fig. 6
Pressure loss diagram
SIZING OF ADDITIONAL EXPANSION VESSELS:
Deduct from the value given in the table the 8 litre
vessel supplied.
Note:
1. Fill C.H. installation to min. 1.5 bar.
2. Expansion vessel must be fitted to central
heating return pipe.
3. The standard 7 litre expansion vessel is
charged to 1 bar.
4. The additional expansion vessel should be
charged to 1 bar.
SAFETY VALVE
SETTING (bar)
VESSEL CHARGE
PRESSURE (bar)
INITIAL SYSTEM
PRESSURE (bar)
TOTAL WATER
CONTENT of SYSTEM
3.0
0.5 1.0 1.5
1.0 1.5 2.0 1.5 2.0 2.0
EXPANSION VESSEL VOLUME (litres)
LITRES
25 3.5 6.5 13.7 4.7 10.3 8.3
50 7.0 12.9 27.5 9.5 20.6 16.5
75 10.5 19.4 41.3 14.2 30.9 24.8
100 14.0 25.9 55.1 19.0 41.2 33.1
125 17.5 32.4 68.9 23.7 51.5 41.3
150 21.0 38.8 82.6 28.5 61.8 49.6
175 24.5 45.3 96.4 33.2 72.1 57.9
200 28.0 51.8 110.2 38.0 82.4 66.2
0.140 0.259 0.551 0.190 0.412 0.33
For syst. volumes other than
those given above, mult. the syst.
volume by the factor across
m |h
3
Q
8
7
6
5
4
3
2
1
00.5 1.5 2.512
Hmbar x 100
2.05 Pump characteristics
The pump head available for circulating the water is given
in fig. 5.
N.B. - The pump is factory set at position 3. The pump is a
Grundfos type 15-50 UPS series.
Grundfos Pump per formance graph
Note - Minimum flow through boiler heat exchanger at any
time should not fall below 6 litres per minute.
If the total volume of water in the system exceeds 40 litres
an additional expansion vessel must be fitted to the central
heating return pipe.
Fig. 5
1 2 3 Speed settings
ABoilers pressure drop
BAvailable pump head C.H.

TEMPRA 24
9
3. INSTALLATION DETAILS
Gas Safety (Installation & Use) Regulations
In the interest of safety, it is the law that all gas appliances are installed by a competent person in accordance
with the above Regulations, Building Regulations/Building Standards Scotland, Codes of Practice, current I.E.E.
Regulations and the byelaws of the Local Water Undertaking. Failure to comply with the Regulations may lead to
prosecution; it is your responsibility to ensure that the law is complied with.
N.B. For Northern Ireland the rules in force apply.
Important - If the boiler is to be fitted in a timber framed building it should be fitted in accordance with the Institute
of Gas Engineers document IGE/UP/7. If in doubt advice should be sought from the Local Supplier.
Location of Boiler
The installation of the Tempra 24 must be on a suitable non-combustible load bearing wall which will provide
an adequate fixing for the boiler mounting bracket assembly. The location should be in an area where
the water pipes will not be subjected to frost conditions. In siting the combination boiler the following
limitations must be observed:
The boiler may be installed in any room or internal space, although particular attention is drawn to the
requirements of the current I.E.E. wiring regulations and in Scotland the electrical provisions of the building
regulations applicable in Scotland, with respect to the installation of the combination boiler in a room or
internal space containing a bath or shower.
Where a room sealed appliance is installed in a room containing a bath or shower any electrical switch
or appliance control utilising mains electricity must be situated so that it cannot be touched by a person
using the bath or shower.
Air Supply
The room or compartment in which the boiler is installed does not require a purpose provided vent when
using the standard concentric flue.
Flue System
The boiler allows the flue outlet to be taken from the rear of the boiler, from either side or vertically.
A standard flue length of 0.75 metres is provided. Alternative lengths of two or three metres can be supplied
(equivalent to wall thicknesses of up to 565, 1815 and 2815mm for rear flues, deduct 91mm plus distance from
side wall for side outlet flues). It is absolutely essential, to ensure that products of combustion discharging from
the terminal cannot re-enter the building, or enter any adjacent building, through ventilations, windows,
doors, natural air infiltration or forced ventilation/air conditioning.
Gas Supply
If necessary the local Gas supplier should be consulted, at the installation planning stage, in order to establish
the availability of an adequate supply of gas.
An existing service pipe must not be used without prior consultation with the Local Gas supplier.
A gas meter can only be connected by the Local Gas supplier, or by a Local Gas suppliers Contractor.
Installation pipes should be fitted in accordance with BS6891-1988.
Appliance inlet working pressure must be 20mbar MINIMUM, for NG and 37 mbar minimum for LPG.
Pipework from the meter to the combination boiler must be of an adequate size.
The boiler requires 2.73m3/h of natural gas, and 2,00 kg/h of LPG.
Do not use pipes of a smaller size than the boiler inlet gas connection.
The complete installation must be tested for gas soundness and purged as described in BS6981-1988. All
pipework must be adequately supported. An isolating gas valve is provided and should be fitted on the boiler gas
inlet. Please wait 10 minutes when lighting from cold before checking gas rate. Gas pressures should be checked
after the boiler has operated for 10 minutes to reach thermal equilibrium.

TEMPRA 24
10
NOTE: A by-pass 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. 7
Central Heating
Detailed recommendations are given in BS6798, BS5449, BS6700 and CP342 Part 2. Pipework not 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 1 is recommended for water carrying pipework. Pipework in
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. 7.
Important - If thermostatic radiator vales are fitted a automatic bypass must be fitted to ensure a minimum flow
rate through the boiler of 6 l/min. The bypass should be fitted as far as possible from the boiler.
Make Up Water
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.
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 pipework is adequately supported
Gas
Additional expansion vessel C.H.
(if required)
By-pass
AUTOMATIC BY-PASS
The by-pass must be capable of
passing 6 l/min of water when
all the trv’s are shut down

TEMPRA 24
11
CLEARANCES:
* 600mm minimum clearance for servicing
access
Top clearance only applies to 100Øconcentric
flue system
460 5 min.5 min.
100 min.900
200 min.
272 50 mm
600* min.
760
Fig. 8
Terminal Position
Fig. 9
P
D, E
Q
Q
l
BC
A
G
F
L
J
HH
K
N
N
MM
Q
Directly below an opening, air brick, opening windows, etc.
Above an opening, air brick, opening windows, etc.
Horizontally to an opening, air brick, opening windows, etc.
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
Fanned
draught
300 mm
300 mm
300 mm
D75 mm
E200 mm
F200 mm
G150 mm
H300 mm
I300 mm
J600 mm
K1200 mm
L1200 mm
M1500 mm
N300 mm
ON/A
PN/A
QN/A
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.
A
B
C
Minimum dimensions of flue terminal positions

TEMPRA 24
12
Ø3/4" Ø1/2" Ø3/4"
200
Ø118
165 min
65
21 min
5 min
183 min
295.5 min
200 min
932 min
269
110
125 min
280
123
3.01 Drilling Template (Top Flue Application) (Standard Top Flue Application)
Select suitable mounting position for boiler, using the template mark flue outlet and boiler mounting
points. Drill two 10mm holes 70mm deep to accept the wall plugs. Fit standard wall plugs on the left and
right side and the special wall plug in the middle (fig. 10a). Fix the wall bracket to the wall using standard
lock nut (M8) on both sides. Mount the boiler on the wall bracket as described in the fig. 10a. Using a core
drill cut a 118mm diameter hole for the flue.
1. CH flow
2. Gas supply
3. CH return
Fig. 10b
Fig. 10a

TEMPRA 24
13
Holes Ø: 45 47 50
Ø
3.02 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. 11).
N.B.: the diameter of the hole is
stamped on the restrictor
Boiler is fitted with Ø45
restrictor as standard
Fig. 11
Choice of restrictor:
RESTRICTOR FOR TWO PIPE SYSTEM
Total flow resistance
of flue system
Use
restrictor
size
minimum maximum mm
0 m 10 m 45
10 m 20 m 47
20 m 35 m 50
35 m 45 m No restrictor
•With concentric systems:
- Choose correct restrictor from table below.
•With 2 pipe system:
- Calculate the total flow resistance of the air
and flue pipes in metres (cap. 3.04.2)
- utilise the table shown below to choose the
moresuitablerestrictorfor theflowresistance
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

TEMPRA 24
14
3.03 Top Outlet Concentric Flue Connection
3.03.1 Vertical concentric connection
DS
L
125
70
50*
30
95
80
80 -3 mm/m
Ø60 Ø80
70 min.
* = between 10 e 60 mm
190 270
Fig. 13
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 mmØrestrictor is
required. Longer than this no restrictor is required.
Fig. 12
Concentric
Vertical
Connector
3.03.2 Horizontal concentric connection
A 90°bend (fig. 13) is supplied for the horizontal connection of air and flue gas pipes. This can be oriented
towards the chosen wall in degrees of 45°.
L = S + D + 205

TEMPRA 24
15
Fig. 14
Notes on concentric horizontal installation
To locate the centre of the hole for passing the
pipes through the wall, refer to fig. 12. 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. 18). Outside, the
pipes should protrude from the wall between 10
and 60 mm (fig. 18).
3.03.3 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
3.05 for use of restrictor
Maximum flue lenght permissible 100 mm concentric 125 mm concentric
Vertical Horizontal* Vertical Horizontal*
Tempra 24 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 Flueing the reduction for appliance bend or turret are already included.
max. 3 m
concentric
100/60
max. 4 m
concentri
c
100/60
Fig. 15a Fig. 15b
Between
10-60mm

TEMPRA 24
16
Fig. 16
Ø80Ø80
AIRFLUE
1
2
3.04 Top Outlet: Two Pipe Flue System
3.04.1 Two pipe connection
Two separate ducts Ø80 for air intake and flue gas discharge can
be directly connected to the boiler. For converson to top outlet
(see 3.05) mount the separate outlet kit 1
Insert blanking plate 2
in remaining air intake
Connect flue duct to central hole Ø80 and air duct to left or right air intake hole Ø80. Insert blanking
plate 2 in remaining air intake.
A varied number of accessories for two pipe systems are available from Ferroli (ref. to page 17). Before
installing your system please check via calculation table at 3.04.2 you are not exceeding the maximum
permissible length for the appliance.
Notes on two pipe system installation:
When using the two pipe system the flue discharge pipe must have a 25mm air gap when passing through
combustible materials.
Where the flue discharge pipe passes through the airing space of an airing cupboard it must be protected by a non
combustible guard or expanded metal giving an annular air gap of at least 25mm.
Where the flue discharge pipe passes through a wall containing cavity insulation, a non combustible sleeve must
be fitted. Additionally a gap of 25mm between the sleeve and the insulation should be provided by cutting back
the insulation or packing loose fill bead insulation with mineral fibre.
Where the flue pipe is run through an unheated roof space it should be insulated with non combustible insulating
material to prevent condensation. The flue pipe should be supported at intervals of not more than 1.8m and
the support should be preferably below a joint.
3.04.2 Two pipe flue system
•Calculating maximum permissible flue length.
The calculation method is based on a standard reference parameter (1 metre of horizontal air flue 80 diameter
80) for the maximum length permissible for all the pipes + fittings flow resistance coefficient. In other words, for
all components and pipes in the different installation configurations (vertical or horizontal, air or flue, etc.) and
for all the fittings, a flow resistance (reduction) equivalent to xmetre of horizontal air induction pipe is indicated.
For every boiler model a maximum pipe length is provided, expressed in nmetres of horizontal air pipe. In
this way, to calculate the length of a proposed 2 pipe air-flue system, add the flow resistance (reduction) in
equivalent metres-air for every component and fitting present in the system, and check that the total is less than
the maximum length permissible for the boiler model.
IMPORTANT: the pipes and fittings flow resistance (reduction) have been summarised on the following
pages. The flow resistance values written refer only to Ferroli pipes and fittings.
Calculation routine
1. Utilise the pipes and fittings flows resistance tables on the following pages and calculate the total flow
resistance in metres-air, by adding the flow resistances of the components in the whole air-flue system, based
on their position (vertical or horizontal, air inlet or flue outlet).
Please note that the same fitting, identified by a one code (i.e. 1 pipe diameter 80, code KWMA83A), can offer
different flow resistances if positioned as air inlet or flue outlet, if placed vertically or horizontally.
The flow resistance of the special two pipe flue-air adapters do not have to be included in the calculation as
they are already included in the maximum length calculation.
2. For the restrictors, please refer to cap. 3.02 to determinate the correct restrictor.
3. Check that the total flow resistance calculated is less or equal to 48 metre, the maximum permissible
for Tempra 24.

TEMPRA 24
17
3.04.3
Tab. 1 - Pipes and fittings reduction table
Air Flue
Vertical Horizontal Vertical Horizontal
Description
Male
-fem
ale
flue Ø80
Male
-fem
ale
bend 45°Ø80
Male
-fem
ale
bend 90
°
Ø80
Air terminal of
inlet protection Ø80
Outlet flue air inlet for
connection with split end
Ø80
1112
1,2 2,2
1,5 2,5
Reduction
2
3
12
Condensate flue
outlet
A
c
c
e
s
s
o
r
i
e
s
Ø
8
0
Airwall terminal
products
of combustion Ø80
5

TEMPRA 24
18
For further accessories please refer to:
"Flue system manual for room sealed boiler"
Attention: Resistance of flue restrictor (if req.)
is included (see table on page 13)
Remove the flue restrictor.
The flue and air pipes must have an inclination
downward equal to 3% from boiler to outside.
Example of calculation for wall inlet/outlet
with 2 pipe system
maximum total flue length: 48 metres
3
2
6 5 1 7
4
Fig. 17
Example of wall inlet/outlet
2 pipe application
Example
of roof inlet/outlet
3.04.4 Example of other installation with two pipe systems
Fig. 18
Fig. 20
REF. N° OF PIECES DESCRIPTION CODE LENGTH OR
REDUCTION
1 1 Air bend 80 mm R/D = 0,75 1,5 m
2 13 Horizontal air pipe 13,0 m
3 1 Air wall terminal 2,0 m
4 1 Air inlet closing flange —
5 1 Flue bend 80 mm R/D = 0,75 2,5 m
6 12 Horizontal flue 24,0 m
7 1 Air wall terminal outlet flue 5,0 m
TOTAL 48,0 m

TEMPRA 24
19
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 downward to disengage it
from the securing pin a.
Fig. 21a
b
b
a
3.05 For installation (back flue connection)
For direct back flue connection it is necessary to use the optional kit, and it is required to alter the fan
direction inside the boiler.
Follow carefully next procedure:
Fig. 21b Fig. 21c Fig. 21d
Remove fan mounting plate by undoing the three fixing screws d. Rotate the fan through 90°so that the fan nozzle
points sideways. Secure the fan to the plate in the new position using screws in position c.
Fig. 21e
c
d
c
d
d
-
c
Common
For rear outlet
For upper outlet
Fig. 21g
For rear
outlet
c
c
c
Fig. 21f
d
dd
For upper
outlet
Take off the four screws which fix the back plate on sealed chamber, remove and rotate
the plate through 90°and fit it to the top of the boiler to cover the original flue outlet.
Secure it in place with the four screws removed previously.

TEMPRA 24
20
Rear
b
b
Fig. 21h
Fix with the screws (b). Refit wiring connec-
tions 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 to
engage with the pin a. Secure with the screws
b. (this fan should only be installed after the
rear flue installation has been completed) see
page 22-23 fig. 24a to 24i.
Boiler Mounting Plate
149
178
131
Fig. 22