RED COMPACT 24 Technical specifications

USE AND INSTALLATION
MANUAL
EN
COD.8901113100

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Contents Technical dept. - All rights reserved - Reproduction prohibited
1. GENERAL INFORMATION ..................................................................................................................4
1.1.Symbols used in this manual............................................................................................................4
1.2.Proper appliance use.......................................................................................................................4
2. GUARANTEE TERMS...........................................................................................................................6
2.1.Warnings .......................................................................................................................................6
2.2.Exclusions ......................................................................................................................................6
2.3.Additional clauses ...........................................................................................................................7
2.4.Liability ..........................................................................................................................................7
2.5.Court with jurisdiction .....................................................................................................................7
2.6.Liability exclusion............................................................................................................................7
2.7.Service call.....................................................................................................................................7
2.8.Installation standards......................................................................................................................8
3. TECHNICAL SPECIFICATIONS AND DIMENSIONS ............................................................................9
3.1.Technical specifications ...................................................................................................................9
3.2.Compact 24 hot water boiler description ...........................................................................................9
3.3.System technical details ................................................................................................................10
3.4.General information ......................................................................................................................12
4. INSTALLING A “COMPACT” HOT WATER BOILER ...........................................................................13
4.1.General warnings..........................................................................................................................13
4.2.Packaging ....................................................................................................................................14
4.3.Boiler room ..................................................................................................................................15
4.4.Connection to the flue pipe............................................................................................................15
4.4.1. Roof outlet along an external steel flue pipe ................................................................................16
4.4.2. Roof outlet along a traditional flue pipe .......................................................................................17
4.5.Baffles .........................................................................................................................................18
5. SYSTEM INSTALLATION PROCEDURE .............................................................................................19
5.1.Requirements for installing the system ...........................................................................................19
6. HYDRAULIC AND ELECTRICAL CONNECTIONS ...............................................................................20
6.1.Hydraulic connection.....................................................................................................................20
6.1.1. hydraulic kit ..............................................................................................................................21
6.1.2. Hydraulic diagram ......................................................................................................................23
6.2.Cleaning the system......................................................................................................................24
6.3.Filling the system..........................................................................................................................24
6.4.Electrical connections ....................................................................................................................26
6.4.1. General warnings .......................................................................................................................26
6.4.2. Wiring diagram of the hot water pellet boiler ...............................................................................27
7. GENERAL INSTRUCTIONS ...............................................................................................................28
7.1.Starting the system.......................................................................................................................28
7.2.Boiler operating parameters...........................................................................................................28
7.3.Nominal operating mode of the system...........................................................................................28
7.4.First start-up ................................................................................................................................28
7.5.System shutdown .........................................................................................................................29
8. OPERATION .....................................................................................................................................30
8.1.WARNINGS PRIOR TO START-UP...................................................................................................30
8.2.CHECK PRIOR TO START-UP .........................................................................................................30
8.3.LOADING PELLETS........................................................................................................................31
8.3.1. Basic fuel requirements ..............................................................................................................31
8.3.2. Loading the boiler ......................................................................................................................31
9. PROGRAMMING AND SETTINGS .....................................................................................................32

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9.1.CONTROL PANEL ..........................................................................................................................32
9.1.1.SETTING THE CURRENT TIME.................................................................................................33
9.1.2.Storing the recipe in the boiler. ...............................................................................................33
9.2.ADJUSTING THE WATER TEMPERATURE IN THE BOILER.................................................................33
9.3.FIRST START-UP ..........................................................................................................................34
9.3.1.Boiler start-up........................................................................................................................34
9.3.2.Boiler switch-off .....................................................................................................................34
9.4.OPERATION .................................................................................................................................35
9.4.1.Operating principle .................................................................................................................35
9.4.2.Operating mode .....................................................................................................................35
9.4.2.1.Internal thermostat - Position of the internal room sensor...................................................37
9.4.2.2.Operation using the external thermostat............................................................................37
9.4.2.3.External thermostat connection.........................................................................................37
9.4.3.Setting the ECO-STOP mode ...................................................................................................37
9.4.3.1.Enabling/Disabling ECO-STOP mode..................................................................................39
9.4.3.2.TO BE PERFORMED BY THE FITTER ..................................................................................39
9.4.4.Programmed mode (with timer)...............................................................................................39
9.4.4.1.Start day (abbreviation on the display UT 01).....................................................................40
9.4.4.2.Clock (abbreviation on the UT 02 and UT 03).....................................................................40
9.4.4.3. Programme .....................................................................................................................41
9.5.PROGRAMMING EXAMPLE .............................................................................................................43
9.6.SAFETY DEVICES..........................................................................................................................46
9.6.1.Alarm signals .........................................................................................................................47
9.6.2.Other display indications .........................................................................................................48
10. MAINTENANCE AND CLEANING.....................................................................................................49
10.1.Instructions for inspection and maintenance ................................................................................49
10.2.Boiler maintenance ....................................................................................................................50
10.3.Recommendations and obligations ..............................................................................................50
10.4.DAILY OR WEEKLY CLEANING UNDER THE USER'S RESPONSIBILITY ............................................51
10.4.1.Before every start-up ..........................................................................................................51
10.4.2.Check every 2 / 3 days ........................................................................................................51
10.4.3.Cleaning the exchanger and the compartment underneath the brazier every 2/3 days ..............52
10.5.ROUTINE CLEANING UNDER THE SPECIALISED TECHNICIAN'S RESPONSIBILITY ...........................53
10.5.1.CLEANING THE EXCHANGER AND PIPE UNIT ........................................................................53
10.5.2.Decommissioning (end of season) ........................................................................................55
10.5.3.Checking the internal components........................................................................................55
11. FAULTS / CAUSES / SOLUTIONS ...................................................................................................57

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Introduction Technical dept. - All rights reserved - Reproduction prohibited
General information
The user is NOT permitted to service this boiler.
The manufacturer cannot be held liable for personal injury, harm to animals or property damage resulting from
failure to observe the instructions contained in the manuals supplied with the boiler.
1. GENERAL INFORMATION
1.1. Symbols used in this manual
When reading this manual, pay particular attention to the parts marked with symbols. These symbols are used to
give the following warnings:
1.2. Proper appliance use
The instruction manual is an integral and essential part of the product and must be kept by the user or system
manager.
Read the warnings contained in the manual carefully, since they provide important information about safe
installation, use and maintenance.
Keep the manual in a safe place for future reference.
Installation and maintenance must be performed in compliance with the applicable regulations according to the
manufacturer's instructions and by qualified personnel trained pursuant to the law.
Incorrect installation or improper maintenance could cause personal injuries, harm to animals or property
damage, for which the manufacturer will not be held liable.
Before carrying out any cleaning or maintenance operations, disconnect the appliance from the mains power
supply using the system switch and/ or the relevant external components and turn off all taps.
If the appliance has a fault and/or is not operating correctly, switch the appliance off and do not make any
attempt to repair it or service it directly. Contact authorised personnel only. Any repairs to products must be
carried out using only original spare parts. Failure to observe the above recommendations may compromise the
safety of the appliance.
If the appliance is sold or transferred to a new owner or the owner moves, leaving the appliance in situ, always
ensure that the manual is kept with the appliance so that it can be consulted by the new owner and/or installer.
For all appliances with optional equipment or kits (including electrical kits) use only original accessories.
This appliance must be used only for the use expressly intended. Any other use is to be considered incorrect and
therefore dangerous.
DANGER!
Serious risk to safety
and to life
CAUTION!
Potentially hazardous
situation for the product and
the environment
NOTE!
Recommendations for
users

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Introduction Technical dept. - All rights reserved - Reproduction prohibited
The COMPACT appliance has been built according to the latest technologies and in
accordance with the applicable technical safety regulations.
Nonetheless, the incorrect use of the appliance may result in hazards and also endanger the
user or others, or even damage the appliance or other objects.
The appliance is intended for the operation of hot water heating systems.
Appliance use in accordance with the envisaged purposes includes scrupulous observance of
the instructions provided in this manual.
RED reserves the right to make any changes to the design and factory settings of the hot water boiler without
having to inform the end users of such changes.

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2. GUARANTEE TERMS
The Manufacturer guarantees the product, with the exception of parts subject to normal wear specified
below, for two years from the date of purchase, provided that proof of purchase is supplied in a document
specifying the name of the retailer and the date the sale was made and that the completed guarantee
certificate was sent within 8 days of said purchase. The product must also be installed and tested by a
specialised installer and in accordance with the detailed instructions provided in the instruction manual that
accompanies the product.
The guarantee covers the replacement or free repair of parts recognised as being faulty at source due to
manufacturing defects.
2.1. Warnings
Installation, electrical connection, functional check and maintenance of this appliance must only be
performed by qualified or authorised personnel.
This appliance must not be used by anyone (including children) with reduced physical, sensory or
mental skills and with little experience and knowledge, unless they are supervised or have been
instructed to use the appliance by the person in charge of its safety.
The guarantee applies, provided that:
1. The boiler is installed, in accordance with the applicable standards in force and the instructions
provided in the product use, maintenance and installation manual, by legally qualified personnel
(Italian Ministerial Decree no. 37 of 22nd January 2008);
2. The customer holds the documentation certifying its suitability in all parts:
a. INSTALLATION REPORT - filled in by the installer
b. TEST REPORT and GUARANTEE APPLICATION - filled in by an authorised serviceman
3. The guarantee applies from the date of first start-up of the boiler, which must be indicated on the
boiler manual or from the invoice date. This documentation must be presented to the authorised
service centre in the event of servicing.
2.2. Exclusions
The guarantee does not cover any parts found to be faulty due to negligence or inappropriate use, incorrect
maintenance, or installation not performed in compliance with the manufacturer's instructions. The
manufacturer will not be held liable for any damage which may - either directly or indirectly - be caused to
persons, animals or property resulting from failure to observe all the instructions provided in this manual
and, specifically, concerning the warnings regarding installation, use and maintenance of the appliance.
The guarantee is not valid if:
1. The terms for the guarantee application were not observed.
2. Installation was not performed in observance of the applicable standards in force and the
instructions provided in the use, maintenance and installation manual.
The guarantee does not cover:
1. Damage made by atmospheric agents, chemicals, electrochemical elements, incorrect product use,
natural disasters, electrical discharges, fires, faults in the electrical system, modifications to or
tampering with the product, and/or other causes not ensuing from the product manufacturing
2. Damage caused by normal corrosion
3. Damage relating to the combustion chamber
4. Damage to seals, claddings, painted/chromed parts, handles and electrical wires
5. Damage to masonry work
6. Damage to parts of the system for the production of DHW not supplied by RED
7. Damage to the heat exchanger if a suitable condensation-proof circuit is not set up to guarantee a
minimum boiler return temperature of at least 55 °C.

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8. Servicing for calibration or product adjustments
9. Incorrect or negligent use.
10. All damage caused by transport; we consequently advise you to check the goods carefully upon
receipt, notifying your retailer immediately of any damage, making a note on the delivery note and
on the copy that travels with the carrier.
Please contact your retailer and/ or local importer in the event of product failure.
RED will not be held liable for any damage which may - either directly or indirectly - be caused to property,
or personal injury or harm to animals ensuing from failure to observe all the instructions provided herein and
the applicable regulations regarding installation, use and maintenance of the appliance.
The parts replaced will be guaranteed for the remaining guarantee cover period starting from the original
date of purchase of the product.
2.3. Additional clauses
If faulty or malfunctioning parts are detected during normal product use, these will be replaced free of
charge ex retailer who made the sale or ex our local technical service centre.
For products sold abroad, the same circumstances will again result in free replacement, ex our retailer, with
the exception of special conditions agreed with the foreign distributor at the time of negotiations.
In the case of replaced parts, the guarantee will not be extended.
No damages are awarded for the product downtime period.
This is the only applicable guarantee and no-one is authorised to provide any other guarantees in the name
of or on behalf of RED.
2.4. Liability
RED will not pay any compensation for direct or indirect damage caused by or dependent upon the product.
2.5. Court with jurisdiction
In the event of any controversy, the court with jurisdiction is the Court of Pordenone (Italy).
2.6. Liability exclusion
The manufacturer is not able to supervise the observance of the instructions provided in this manual. Nor is
it able to monitor the conditions and methods of installation, operation, use and maintenance of the
product. Incorrect installation could cause damage and endanger persons. Consequently, we cannot be held
in any way liable for losses, damage or costs ensuing from incorrect installation, improper functioning and
incorrect use and maintenance or in any way connected to the latter. Similarly, we will not be held in any
way liable for any violations of patents or third party rights ascribable to the use of this product.
The manufacturer reserves the right to make any changes to the product, technical specifications or to the
manual without notice.
If hazard-free operation is no longer possible (for instance, due to visible damage), turn off the appliance
immediately.
2.7. Service call
The service call must be made to the retailer or service centre.
The manufacturer cannot be held liable if the product and any of its accessories are used incorrectly or
modified without authorisation.
Only original spare parts must be used for replacements.

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2.8. Installation standards
The Compact boiler is designed to run on wood pellets.
It must be installed according to the provisions of the following standards:
Italian Law Decree no. 93 of 25th February 2000
Implementation of Directive 97/23/EC (P.E.D.) on the subject of pressure equipment.
SCOPE OF APPLICATION: liquid fuel (naphtha, gas oil, fuel oil) and solid fuel operated appliances.
ITALIAN LAW of 5th March 1990 no. 46 and related applicative regulations Italian Ministerial Decree no.
447 of 6th December 1991 (and subsequent amendments) and Italian Ministerial Decree no. 37 of 22nd
January 2008
System safety standards
SCOPE OF APPLICATION: without limits to heat potential.
Standard UNI 10847 of 03/2000
Single flue systems for liquid and solid fuel generators. Maintenance and control. Guidelines and procedures.
SCOPE OF APPLICATION: liquid and solid fuel operated systems.
ITALIAN LAW of 9th January 1991 No. 10 and related applicative regulations Italian Ministerial Decree
no. 412 of 26th August 1993 (and subsequent amendments), Italian Ministerial Decree no. 551 of 21st
December 1999.
Regulations specifying amendments to Italian Presidential Decree 412 on the subject of planning, installing,
running and servicing heating systems in buildings for the purposes of limiting energy consumption.
SCOPE OF APPLICATION: without limits to heat potential.
ITALIAN LAW NO. 186 of 01.03.1968
Installation standard CEI 64-8 / II ed.
Electrical utility systems at a nominal voltage of no more than 1000 V in alternating current and 1500 V in
direct current.
Installation standard CEI 64-8 / I ed.
Electrical utility systems in buildings intended for residential and similar purposes.
Standard UNI 10683 of 09/2005
Systems running on wood or other solid biofuels.
Installation requirements
SCOPE OF APPLICATION: systems running on wood or other solid biofuels with a heat decomposition power
of the combustion chamber below 35 kW.
The installation procedure requires the scheme for the heating system, prepared in accordance
with the standards and local recommendations in force, as follows:
For the heating system - EN 303-5/2000 - "
Boilers for heating. Part 5: Heating boilers for solid
fuels, hand and automatically stocked, nominal heat output of up to 300 kW. Terms, requirements, tests
and marking
".
Local requirements for the flue connection.
Local requirements for fire-prevention standards.
For the power circuit - EN 60335-1/1997- “
Safety of electrical appliances for domestic and similar
use, Part 1 – General requirements
”.
This appliance must be installed in accordance with the provisions of the applicable standards in force in the
country of installation of the boiler.

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3. TECHNICAL SPECIFICATIONS AND DIMENSIONS
3.1. Technical specifications
The hot water pellet boilers in the "COMPACT 24" range are pellet boilers for the production of hot water
with a steel structure, which use solid biomasses in the form of pellets as fuel. The boiler is designed for
connection to heating systems and to the Domestic Hot Water system.
3.2. Compact 24 hot water boiler description
The "COMPACT 24" hot water pellet boiler heat exchanger complies with the operating requirements
of this type of appliance, as set out in the operation standard:
EN 303-5/2000 –
Filling tank provided
with a capacity of
approximately
110 litres
(about 70 kg)
Domestic hot
water exchanger
Large ash tray for
a weekly clean
Cast iron grate
unit for long-
lasting durability
Programmable
electronics to
control the
boiler functions

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3.3. System technical details
The heat and technical details of the pellet boiler system using wood pellets:
Parameter Measurement unit Compact 24
Nominal heat output kW 22.7
Nominal heat output in combustion
chamber
kW 25.4
Operating range (min – max) kW 6.3 – 22.7
Efficiency (min – max) % 85.4 – 89.2
Average consumption rate
(min – max)
kg/h 1.5 – 5.2
Class compliant with EN303-5 3
Smoke flow rate (min – max) g/s 8.4 – 17.1
Draught (min – max) Pa 8.5 – 13.3
Smoke temperature °C 112
Boiler water capacity l 25
DHW flow rate l/min 10.5
Maximum operating temperature bar 3
Max adjustable water temp. °C 85
Pellet tank capacity kg 70
Running time with average load h 25
Diameter of flue pipe mm 100
Heating connections G ¾” male
Domestic Hot Water connections G ½” male
Electricity supply 50 Hz; 230V AC
Power absorption (max – average) kW 420 - 100
Dimensions (WxDxH) mm 600x660x1235
Boiler weight kg 190

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The following figures show the dimensions and structure of the system modules:
225
196
69
95
50
434
130
Ø100
1235
25
30
660
600

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3.4. General information
The main characteristic of the boiler is that it burns a natural fuel (pellets) obtained ecologically from wood
industry waste (sawdust, chips). The sawdust and chips obtained from wood machining are first suitably
cleaned and dried, and then compacted at very high pressure to produce small nuggets of pure wood, i.e.
pellets.
It is an absolutely ecological fuel since it does not use any glue to keep it compact. Indeed, the compact
nature of pellets over time is ensured by a natural substance found in wood: jet (or lignite).
Each pellet can vary in length and thickness, between 1÷3 cm in length and 6÷8 mm in diameter
respectively. The main characteristics of pellets are their low humidity (below 12%). Their high density
(approx. 600 kg/m3) and regular compact texture give this type of fuel properties of high heating value
(LHV 4100÷5000 kcal/kg).
In order to prolong the life cycle of the boiler, RED recommends the use of good quality pellets.
The pellets to be used to power the boiler must have high quality characteristics, such as those set out in
standards DIN 51731 and ÖNORM M7135.
I
t is vital that you check re
g
ularly that there are some pellets left inside the
tank to avoid them runnin
g
out completely and therefore the boile
r
shutting off.
W
ARNINGS
T
he use of poor quality pellets or of any other inappropriate material could
dama
g
e certain components of the boiler and
j
eopardised its correct
functioning: this could render the guarantee null and void, and relieve the
manufacturer of any liability. RED encoura
g
es users to use pellets which
comply with the characteristics set out herein above.

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4. INSTALLING A “COMPACT” HOT WATER BOILER
4.1. General warnings
oThis boiler must only be used for the use expressly intended. Any other use is to be considered incorrect
and therefore dangerous.
oThis boiler is designed to heat water
oThese appliances are designed solely for installations in suitable rooms or technical premises.
Consequently, these appliances cannot be installed and operated outdoors. Outdoor installation could
lead to malfunctions and hazards. For outdoor installations, we advise you to choose an appliance
designed specifically for this purpose.
oThe boiler must NOT be used by children or unassisted persons with limited abilities.
oDo NOT leave any packaging components within the reach of children or persons with limited physical,
sensory or mental skills or with little experience and knowledge.
oDo NOT touch the boiler bare foot and with wet or damp body parts
oThe venting apertures are vital for correct combustion
oAfter a prolonged period of inactivity, check for any obstructions before starting the boiler.
oDo NOT block or reduce the size of the venting apertures of the room where the boiler is installed
oDo NOT pull, detach or tamper with the electrical wires protruding from the boiler, even when the latter
is cut off from the electricity mains.
oCaution: some parts of the boiler can get very hot; you are therefore advised to wear suitable heat
protection.
oDo NOT modify the safety or regulating devices without the manufacturer's authorisation.
oThe door to the combustion chamber MUST remain shut during normal product operation
oThe boiler was designed to operate in any weather, yet in the case of adverse weather (strong wind,
ice), the safety systems may be triggered and shut off the boiler. If this is the case, contact the service
centre and do not override the safety devices.
oIn the event of fire in the flue pipe, call the fire brigade.
oIf the boiler shuts down, for reasons other than routine maintenance, call the service centre.
oBefore making the boiler connections, have professionally qualified staff perform the following:
a) Clean thoroughly all system piping to remove any residue or impurities which could compromise the
correct functioning of the boiler
b) Check that the chimney flue/flue pipe has a suitable draft, is free of any kinks, and that no outlets
from other appliances are introduced there.
oThe appliance must be installed by a qualified fitter with the required technical and professional
qualifications pursuant to Italian Law 46/90 and to Italian Ministerial Decree no. 37 of 22nd January 2008
who, under his own responsibility, shall guarantee compliance with the regulations of good practice.
oThe boiler must be connected to a heating system and/or to a domestic hot water production network,
compatibly with its performance and power.

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4.2. Packaging
The boiler is delivered complete with all electrical and mechanical components and it is factory tested.
Open the package, remove the three screws from the front bracket and the other three from the rear bracket;
these brackets secure the boiler to the pallet (fig.1).
The materials making up the packaging are neither toxic nor harmful, and so require no particular disposal
measures.
Storage, disposal or any recycling is therefore under the responsibility of the end user in compliance with the
applicable laws in force.
The boiler must always be handled vertically, using manual or mechanical cranes, which can lift the pallet on
which it is packaged or the boiler itself directly. The boiler - as illustrated in figure 2 - comes with a hook to make
all handling easier.
Take special care not to damage electrical or mechanical parts, with shocks or water sprays once the protective
packaging has been removed.
After removing the packaging, make sure the boiler is complete and undamaged
If in doubt, contact the retailer
The document envelope contains:
System manual
An instruction manual for installation, use and maintenance
Appendix G - Technical inspection report for heating system with an output of less than 35 kW
Guarantee
Figure 1 - Removing the packaging screws
Figure 2 – Handling hook

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4.3. Boiler room
Make sure the room complies with the requirements and characteristics set out in the applicable regulations in
force. It is also necessary for the room to provide at least as much air as is required for regular combustion. It is
therefore necessary to make holes in the walls of the room, which comply with the following requirements:
Have a free cross-section of at least 6 cm2 for every 1 kW (859.64 kcal/h). Nevertheless, the minimum
cross-section of the opening must never be less than 100 cm2. The cross-section can also be calculated
using the following ratios:
S = K * Q ≥100 cm2
Where “S” is expressed in cm2, “Q” in kW, “K” = 6 cm2/kW
The opening must be situated at the bottom of an external wall, preferably opposite the one where the
combustion gases are vented.
4.4. Connection to the flue pipe
For the connection of the flue outlet pipe, local and national regulations must be observed (see Standards
UNI 7129 and UNI 10683).
A flue pipe must comply with the following requirements:
It must be made of waterproof material resistant to the temperature of the smoke and related
condensation.
It must ensure sufficient mechanical resistance and weak heat conductivity.
It must be perfectly sealed, to avoid the cooling of the flue pipe itself.
It must be arranged as vertically as possible.
Chimneys both old and new, built without observing the above specifications, may be conveniently
recovered by "intubating" the chimney itself. This means a metal flue shall be inserted inside the existing
chimney and the space between the metal flue and the chimney shall be filled with suitable insulation.
In order to prevent the wind from creating pressure areas around the chimney that prevail over the rising
force of the combustion gases, the outlet aperture must be positioned at least 0.5 metres above any
structure adjacent to the chimney itself (including the ridge of the roof) at least 8 metres away.
The flue pipe must have a diameter of no less than the boiler union; for flue pipes with a square or
rectangular cross-section, the internal cross-section must be increased by 10% compared to the boiler
union.
The useful cross-section of the flue pipe can be calculated using the following formula:
S = K x P/√H
Sensuing section in cm2
Kreduction coefficient: 0.045 for wood
Pboiler output in kcal/h
Hheight of the chimney in metres, measured from the flame axis to the outlet of the chimney into the
atmosphere. When sizing the flue pipe, please take into account the actual height of the chimney in
metres, measured from the flame axis t the top, decreased by:
0.50 m for every change in direction of the union duct between the boiler and the flue pipe
1.00 m for every metre of horizontal development of the union itself.

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We recommend the sole use of outlet ducts which are suitable for the
type of fuel used. The supplier will not be held in any contractual and
non-contractual way liable for damage caused by installation and
usage errors and in any case due to failure to observe the instructions
provided by the manufacturer of the appliance.
The products of combustion of the boiler cannot be discharged in
collective flue ducts.
The correct installation of the flue duct is necessary to encourage the
normal flow of smoke from the combustion chamber to the outside in
the event of an electrical power failure.
Remember that a draught of 10 Pa must be guaranteed.
Below are the main characteristic traits of the flue duct according to the provisions of standards
UNI 7129 and UNI 10683:
The smoke outlet must be equipped with inspection valves;
The minimum height of the pipe directly connected to the smoke outlet of the boiler must be between 2-
3 m;
If the presence of a horizontal section is necessary, we recommend that the same is of a maximum
length of 1.5 m and with a slope gradient of 3-5% to encourage the smoke to flow away;
Use of a wind-proof and rain-proof terminal to avoid changing the slight overpressure inside the
flue pipe (we recommend you end the flue pipe with a horizontal section);
The outlet ducting must be made with suitable materials which can withstand the products of combustion
and any condensation of the same (the inspection valve can allow any condensation that has formed to
be vented);
The ducts must be built to ensure maximum seal against smoke (UNI 10683);
We recommend you insulate the duct, especially on the outside part exposed to the weather.
Avoid installing completely horizontal sections.
The room where the heat generator is to be installed must not contain any existing or envisaged
smoke suction hoods in order to avoid depressurising the setting.
The air intakes must not be closed.
Make sure the flue pipe is kept clean, cleaning it at least once a year.
In the event of a fire in the flue pipe or duct, switch the boiler off
immediately and disconnect it from the domestic electricity mains
4.4.1. Roof outlet along an external steel flue pipe
One of the installation solutions which could be used is to position the boiler near a perimeter wall of the home
(see figure below) so that the smoke is discharged along an external flue pipe. Here are some of the provisions
of standard UNI 7129 for this particular system configuration:
- Always make sure there is an inspection valve to allow periodic and efficient cleaning, as well as the venting of
any condensation that may have formed;
- The chimney must under all circumstances be wind-proof and rain-proof;
- Make sure the smoke outlet duct is suitably insulated in the section that crosses the wall.

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It is advisable for the smoke outlet duct, if it is completely outside, to be made of double-wall stainless steel to
guarantee both greater resistance to the atmospheric agents as well as the appropriate temperature of the
smoke outlet.
4.4.2. Roof outlet along a traditional flue pipe
The flue smoke can also be discharged using an existing traditional flue pipe provided it is compliant to standards
(see UNI 10683).
Here is a brief list of the main characteristics highlighted in the standard that distinguish a good chimney:
- Suitable insulation and lagging especially in the external section exposed to the atmosphere;
- Constant internal cross-section (there must not be any narrower sections);
- Made with material resistant to high temperatures, to the action of the products of combustion and to the
corrosive action of any condensation that may form;
- Prevalently vertical arrangement with deviations from the axis of no more than 45°;
Chimney
Insulate the
flue pipe
Soot tray
Soot tray accessible for
inspection with possible
condensation discharge

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It is compulsory to plan a chamber for the collection of solid material and/or any condensation, which can be
inspected through an airtight door.
It is compulsory for you to observe the provisions of standards UNI 9615 and 9731 for the sizing of the chimney
cross-section and in any case that you avoid installing ducts with a cross-section of less than 150 mm.
In the case of larger cross-sections, it may be necessary to insert a steel duct inside the masonry one.
Direct wall discharge is not permitted.
The steel pipe must be suitably insulated with material which is resistant
to high temperatures and sealed off from the external chimney.
4.5. Baffles
In certain installation conditions there might be an acoustic resonance due to the pressure differential in the fluid
dynamics between combustion air inlet and exhaust fumes outlet.
To solve the problem removable baffle sections are fitted in each air inlets of the Compact 24.
After the first ignition if a background noise becomes audible 1 or 2 baffle sections must be removed, or more
until the resonance ceases.
SETTORE
SECTION

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1235400
660
600
1000400
300 500
5. SYSTEM INSTALLATION PROCEDURE
5.1. Requirements for installing the system
othe minimum clearance in front of the boiler to allow it to be cleaned, serviced, etc. must be
1000 mm;
othe minimum clearance permitted between the rear of the boiler and a wall must be 400 mm;
othe minimum clearance between the top of the boiler and a wall (ceiling) must be 400 mm to ensure easy
access for cleaning and servicing the heat exchanger (to remove the ash, for instance);
othe minimum distance between the boiler and the wall must be 300 mm.
Air inlets linked to the outside must be arranged and, in compliance with the provisions of Standard UNI 10683,
these must have the following characteristics:
1. Have a free cross-section of no less than 100 cm2;
2. Be provided as close to floor-level as possible;
3. Be suitably protected by a wire mesh or grate so that the free cross-section for air passage is not reduced;
4. Be positioned in such a way as not to be obstructed in any way.
The correct supply of air can be guaranteed through apertures into an
adjoining room, provided that direct ventilation is provided and that such
a room is not a fire hazard, such as store rooms, garages or warehouses,
in accordance with the regulations set out in Standard UNI 10683.
It is advisable to install the boiler in premises which do not contain appliances that do not operate in a room-
sealed manner or appliances that could depressurise the room itself compared to the outside and thereby cause
problems relating to poor draft for the smoke evacuation system (UNI 10683).

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6. HYDRAULIC AND ELECTRICAL CONNECTIONS
6.1. Hydraulic connection
IMPORTANT!
If the boiler installation envisages interaction with another existing system complete
with another heating appliance (gas boiler, methane boiler, diesel boiler, etc.…), ask for
qualified personnel for assistance to ensure the system is compliant with the applicable
laws in force.
The manufacturer will not be held liable for property damage or personal injury or in the
event of failed or incorrect functioning, if the above warnings are not adhered to.
225
196
69
95
50
2
1
3
4
5
6
7
50 69 95
1 EXHAUST 5 DOMESTIC WATER INLET
1/2”G MALE
2 SAFETY VALVE 6 HEATING RETURN
3/4”G MALE
3 FILLING 7 HEATING FLOW
3/4”G MALE
4 DOMESTIC WATER OUTLET
1/2”G MALE
Make the connections to the corresponding unions illustrated in the above diagram, avoiding any tension and
undersizing of pipes.