Sulzaima 18 kW Compact Boiler User manual

Pellet Boilers
Instruction Manual
English
Models
18 kW Compact Boiler
24 kW Compact Boiler
Be sure to read these instructions carefully before installing, using and servicing the unit.
The product is supplied with this instruction manual.
Mod. 410-B

Thank you for purchasing a SOLZAIMA unit.
Please read this manual carefully and keep it for future reference.
*All the products comply with the requirements of the Construction Products
Regulation (Reg. EU no.305/2011) and is certified with the CE conformity marking;
* Solzaima’s Pellet Boilers are manufactured in compliance with the EN 14785:2008
Standard
* SOLZAIMA shall not be liable for any damages to units not installed by qualified
personnel;
* SOLZAIMA shall not be liable for any damages to units not installed or used in non-
compliance with the instructions included in this manual;
* All installation, operation and servicing procedures performed to the unit must
comply with any local regulations, including but not limited to applicable national and
European standards;
* If you need assistance, please contact your unit’s supplier or installer. You must
have the pellet boiler serial number, located on the identification plate affixed on the
unit's rear panel and on the sticker on the plastic cover of this manual ready.
*The technical service must be performed by the unit Installer or Supplier, except on
situations where the assessment performed by the installer or service engineer
determines that SOLZAIMA should be contacted, if required.

Contents
1. Package content ...........................................................................................................3
1.1. Unpacking the boiler ...............................................................................................3
2. Safety precautions ................................................................................................4
2.1. For your safety, please remember:..........................................................................4
3. Technical specifications.................................................................................................7
4. Installing the pellet boiler...............................................................................................9
4.1. Installation requirements .........................................................................................9
4.2. Installation of ducts and fume exhaust systems:....................................................10
4.3. Installation in the absence of a chimney................................................................ 11
4.4. Installation with a chimney ....................................................................................14
4.5. Hydraulic installation .............................................................................................15
5. Fuel.............................................................................................................................15
6. Using the pellet boiler..................................................................................................16
7. Remote control............................................................................................................18
7.1. Display and control panel......................................................................................18
7.2. Display information summary ................................................................................19
7.2.1. Menu ........................................................................................................19
7.2.2. Water temperature....................................................................................20
7.2.3. Date/Time.................................................................................................21
7.2.4. Timer ........................................................................................................23
7.2.5. Sleep........................................................................................................26
7.2.6. Configuration menu ..................................................................................27
7.2.7. User Info...................................................................................................31
8. Starting-up the unit......................................................................................................34
8.1. Stopping the unit...................................................................................................34
8.2. Turning off the unit ................................................................................................34
8.3. Instructions for removing the side covers ..............................................................35
8.3.1. Removing the side covers.........................................................................35
8.3.2. Pellet reservoir lid .....................................................................................35
8.4. Filling the pellet reservoir ......................................................................................36
8.5. Installing and operating with a remote control (programmable thermostat) – not
supplied with boiler units .......................................................................................36
8.5.1. Instructions to perform the remote control connections .......................37
9. Installing the safety option – UPS Kit...........................................................................40
10. Maintenance .......................................................................................................41

11. Alarm / fault / recommendation list ......................................................................47
12. Installation diagrams (for back boilers only - 18kW Compact Boiler and 24 kW Compact Boiler)...49
12.1. Central heating installation diagram ................................................................49
12.2. Wood and pellet central heating installation diagram.......................................50
12.3. Installation diagram of pellet boiler for central heating with wall-mounting.......51
12.4. Installation diagram for central heating and household water heating using a
cylinder thermostat..........................................................................................52
12.5. Symbols..........................................................................................................53
13. Electrical diagram of the pellet boiler ...........................................................................54
14. Performance graphs for the UPSO 15-55 CIAO circulation pump................................55
15. Life cycle of a pellet boiler ...........................................................................................56
16. Sustainability...............................................................................................................56
17. Glossary......................................................................................................................57
18. Warranty .....................................................................................................................59
19. Annexes ......................................................................................................................59

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About Solzaima
Solzaima's vision has always been to provide the cleanest, renewable and more
cost-effective energy possible. This is why for more than 35 years we've been
dedicated to manufacturing biomass heating units and solutions.
As a result of the persistence and unconditional support from a network of partners,
Solzaima is currently the leader in biomass heating units manufacturing, supported
by its range of central heating units with back boilers, pellet boilers and free standing
fires.
We deliver biomass heating units to approximately 20,000 homes every year. This
effectively demonstrates consumers' interest in more ecological and economic
solutions.
Solzaima has been awarded Quality certification under ISO9001:2008 and
Environmental certification under ISO14001:2004.

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1. Package content
Solzaima ships the unit with the following components:
- 18 kW Compact Boiler or 24 kW Compact Boiler
- Instruction manual
- Power cable
1.1. Unpacking the boiler
When unpacking the unit, please refer to the illustrations below. First remove the
retractable bag covering the cardboard box (Figure 1-a). Pull the cardboard box out
(Figure 1-b) by lifting it and then remove both the bag covering the boiler and the
styrofoam plates. Finally, unscrew the four pieces securing the unit to the wood pallet
(Figures 1-c and 1-d).
a) b)
c) d)
Figure 1 –Unpacking the boiler

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2. Safety precautions
Solzaima shall not liable for any damages to the unit caused by failure to comply with
the specified precautions, warnings and operating procedures.
Wile units manufactured by Solzaima are easy to operate, special attention was
given to their components to prevent accidental damages to users and installers.
The units must only be installed by an authorised engineer, who should supply the
client with a relevant statement of conformity and who shall be liable for the final
installation and consequent product good operating conditions.
This unit must be used according to its intended use as specified by the
manufacturer. The manufacturer excludes all contractual or non-contractual
obligations regarding damages to people, animals or property arising from the unit’s
misuse, faulty installation or servicing procedure.
After removing the packaging, verify the contents to check their integrity and
completeness. If the contents of the package do not correspond to the items listed
under 1, contact the sales representative from whom you purchased the unit.
The complete set of parts provided with the unit guarantees its operation and energy
efficiency; these parts should only be replaced with original parts provided by an
authorised technical assistance centre.
The unit must be subject to maintenance at least once a year by the installation
engineer.
This manual is provided with the product. Please keep it close to the unit.
2.1. For your safety, please remember:
The pellet boiler is a biomass heating unit. Be sure to carefully read and
understand the information contained in this book, before handling or operating the
unit;
Make sure the hydraulic circuit is correctly assembled and connected to the water
supply system before turning on the pellet boiler;
 The boiler is not intended for use by children or persons with a physical, sensory
or mental handicap, unexperienced or unaware of its proper use, unsupervised or not
instructed concerning the use of the unit;
Do not touch the boiler when barefoot or any part of your body is wet or humid;

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Do not tamper with any safety or adjustment features of the unit without the
manufacturer's authorisation;
Do not cover or reduce the size of the aeration vents existing near the installation
area;
The pellet boiler needs air circulation for proper combustion, so possible air
tightness of the location or any existing air extraction sources in the room may
prevent the unit’s proper operation;
The existence of aeration vents is a requisite for proper combustion;
Do not leave the packing materials near children;
During the unit's normal operation do not attempt to open the boiler's door;
Avoid direct contact with parts of the unit that overheat during operation;
Check the fume duct for blockages before turning on the unit after a long period
of inactivity;
This pellet boiler is intended for residential use in a protected environment. The
unit might get turned off by any safety systems installed in the household. If this
occurs, contact the technical assistance. Under no circumstances should you disarm
the safety systems;
The pellet boiler is a biomass heating unit equipped with a fume exhaustion
system powered by an electric exhauster. The occurrence of any power failure during
its use may prevent the fume exhaustion thus causing the room to be filled with
smoke. For this reason, you should have a natural fume exhaustion system, like a
chimney, installed;
Solzaima offers you an optional safety system which allows the boiler unit to be
connected to a UPS to allow that during any power failure the fume exhaustion
system will still operate until complete exhaustion of all boiler fumes;
If you intend to use the boiler unit unsupervised or while you are away from
home, you should use the above safety system for total safety during any power
failure;
During operation, NEVER turn off the pellet boiler by unplugging the power cord
from the wall socket. The fume exhaustion system on the pellet boiler is power-
operated so disconnecting the power plug will prevent the exhaustion of combustion
fumes;

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Before performing any maintenance or assistance to your unit, disconnect it from
the power mains. Before performing any of these operations, allow the unit to cool
down completely (if previously operating);
Never touch the interior of the boiler when connected to the power mains;
For this boiler, the maximum setting for the water temperature that can be
specified by the user (water set-point temperature) is 85°C. If a temperature of 90ºC
is reached, the boiler automatically turns off causing the corresponding alarm to go
off.

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3. Technical specifications
Features
Boiler
C18 kW
Boiler
C24 kW
Units
Weight
230
232
Kg
Height
1305
1305
mm
Width
667
667
mm
Depth
744
744
mm
Fume discharge pipe diameter
100
100
mm
Reservoir capacity
60
60
kg
Maximum heating capacity
410
523
m³
Maximum overall thermal power (air/hydro)
18
23
kW
Minimum thermal power (air/hydro)
6,5
6,5
kW
Minimum fuel consumption
1,6
1,6
kg/h
Maximum fuel consumption
4,5
5,8
kg/h
Rated electrical current
134
134
W
Electric power at start-up (<10 min.)
434
434
W
Rated voltage
230
230
V
Rated frequency
50
50
Hz
Thermal yield at rated thermal power
89,6
89,3
%
Thermal yield at reduced thermal power
91,8
91,8
%
Combustion gas flow (max.)
19
21
g/s
Combustion gas flow (min.)
10
11
g/s
Max. gas temperature
148
172
ºC
CO emissions at rated thermal power
0,009
0,014
%
CO emissions at reduced thermal power
0,038
0,038
%
Draught in the chimney
12
12
Pa
Boiler's water volume
22
22
L
Fume extractor noise emission
49,1
49,1
dB(A)
Table 1 –Technical specifications

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The tests were performed using wood pellets with a heating capacity of 4.9 kWh/kg.
The above information was obtained during product homologation tests performed by
independent laboratories accredited for pellet unit tests.
Front Rear Side Top
Figure 2 - Pellet Compact Boiler - Measures
Figure 3 - Pellet compact boiler - Hydraulic connections

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4. Installing the pellet boiler
Before installing the unit, please perform the following steps:
When receiving the package, inspect the product to check for completeness
and any signs of damage. Any damages or defects should be acknowledged before
the unit is installed;
The boiler has four adjustable feet at the base which allow for an easy setting of
the height when the unit is installed on a non flat surface;
Figure 4 –Adjustable feet
Remove the instruction manual from the package and hand it over to the client;
Connect the combustion gas outlet to the fume exhaustion duct going out of the
building (through a chimney, for instance) using a 100mm-wide piping – check the
diagrams under section 4;
If using a tube for admission of external air for combustion, this tube must have
a maximum horizontal length of 60cm, straight and with no elbows;
Perform the hydraulic system installation (please refer to section 4.5);
Connect the 230 VAC power cable to a grounded wall power socket;
The remote control of the unit includes a programmable thermostat. As an
option, a conventional external programmer may be used (not provided with the
unit) to automatically setup the unit's operating periods.
4.1. Installation requirements
Figure 5 specifies the minimum separation distance between the pellet boiler and
particularly flammable surfaces.

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The top of the boiler must be separated at least 100cm from the ceiling, especially in
rooms with ceilings consisting of flammable materials.
The base supporting the boiler cannot be made of combustible material, so make
sure you always put in place an adequate protection.
a) b)
Figure 5 –Minimum separation distances from all surfaces: a) top view of an installed
unit; b) side view of an installed unit
WARNING!
Keep combustible and flammable materials away from the unit, at a safe distance.
4.2. Installation of ducts and fume exhaust systems:
The gas exhaust pipe must have been designed for this purpose, in compliance
with local requirements and in accordance with any existing applicable regulations.
 Important! An inspection T-tube with airtight lid must be attached to the
outlet of the unit’s exhaust pipe to allow for the regular inspection of the system or
release of heavy dust and condensates.
As shown in Figure 5, the assembly of the exhaust pipe must include inspection
couplers to allow access for cleaning and maintenance operations.
Under normal operating conditions, the combustion gas exhaustion should create
a draught of 12 Pa one meter above the chimney neck.
The boiler should make exclusive use of the chimney.
All pipes on the exterior to the installation location must have an internal diameter
of 100mm and double stainless steel insulation.

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The fume exhaust pipe may generate condensation, so we recommend that
the appropriate systems for collecting condensates should be installed.
4.3. Installation in the absence of a chimney
The installation of the pellet boiler in the absence of a chimney should be performed
as shown in Figure 6, by directing the fume exhaust pipe (with a minimum inner
diameter of 80mm for the air model and 100mm for the water model) straight
outwards and onto the top of the roof.
Double-wall stainless steel insulated pipes must be used and these pipes must be
properly fastened to avoid condensation.
The installation of an inspection T-tube at the base of the piping must be considered
to allow for the performance of periodic inspections and annual maintenance, as
shown in Figure 6. Figure 7 shows the basic requirements for installing the boiler’s
flue pipe.
Figure 6 –Side view: installation with a chimney with inspection coupler.

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a)
b)

13
c)
Figure 7 –Examples of standard installations.
Failure to comply with these requirements may prevent the correct operation of
the boiler. Follow all the instructions shown on the diagrams.
Because the boilers operate with the combustion chamber in draught it is an
absolute requirement to install a fume exhaust pipe to allow for the proper extraction
of the combustion gases.
Fume duct materials: The tubing must be made of 0.5mm thick rigid stainless steel,
use with pipe fittings to attach different sections and accessories.
Insulation: The fume ducts must be double-wall and properly insulated to make sure
that fumes do not cool down going outwards, which would cause inadequate
circulation and condensation that may damage the unit.
Out T-tube: Make sure you attach to the boiler output a fitting T-tube.

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Anti-downdraught terminal: An anti-downdraught terminal must be installed to
avoid the backflow of fumes.
Draught in the chimney: The following figures show three standard diagrams
containing the correct length and diameter specifications. Any other type of
installation that you choose to perform must guarantee a draught of 12 Pa
(0.12mbar) measured at maximum heat and power.
Ventilation: For the boiler’s correct operation it is necessary to have an air inlet
with a minimum section of 100cm2 available at the installation location,
preferably near the rear panel of the unit. The boiler is equipped with a round pipe
( 50mm) that may be connected to the exterior of the house.
4.4. Installation with a chimney
As shown in Figure 8, the  100mm exhaust pipe of the pellet boiler is installed
directly on to the chimney. If the chimney is too large, we recommend that you attach
an  80mm pipe to the fume outlet.
You should also consider attaching a T-tube to the base of the pipe to allow for
periodic inspection and annual maintenance, as illustrated in Figure 8.
Figure 8 –Side view: installation with chimney with inspection coupler.
We do not recommend that you use the boiler in rough weather conditions that may
seriously impact the draught (particularly with very strong winds).

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If you do not use the unit for a long time, check it to make sure that the flue pipes are
clear before lighting the fire.
4.5. Hydraulic installation
* Chapter 12 (installation diagrams) contains the optional connection diagrams for
central heating installations, with or without water heating for household use;
* The pellet boiler is equipped with a circulation pump, an expansion vessel (6 litre
volume in the 18kW compact boiler model) or 10 litre volume (in the 24kW compact
boiler model) and a 3 bar safety valve;
* Operating pressure ranges from 1-1.5 bars;
* To empty the unit, attach a T-tube with a tap at the outlet (connected to the
household sewage); the safety valve (3 bar) outlet should also be connected to
the household sewage;
*The heating fluid must consist of water with an anti-rust, non-toxic product added in
the quantity recommended by the manufacturer. If the location where the boiler or the
fluid pipes are installed is likely to freeze, the installation engineer must add to the
circulating fluid the amount of antifreeze product recommended by the manufacturer,
to avoid it to freeze at the estimated minimum temperature.
5. Fuel
The pellet boiler must be operated exclusively with pellets. No other fuel may be
used.
Use only pellets certified by standard EN 14961-2 grade A1, with a 6mm diameter
and a length between 10-30mm.

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The pellets may have a maximum humidity of 8% their weight. To guarantee a good
combustion, the pellets must maintain these characteristics so they should be stored
in a dry place.
The use of pellets other than those recommended may reduce the efficiency of the
unit and cause deficient combustion.
You should always use certified pellets and must not forget to test a sample
before buying large bulks.
The physical/chemical properties of the pellets (i.e. the calibre, friction, density and
chemical composition) may vary within specific tolerances and according to each
manufacturer. Please note that this may cause alterations to the combustion feed
that would consequently cause the need to use different quantities of pellets.
The boiler allows the quantity of pellets to be adjusted during start-up and at
the different power ranges by ± 25% (refer to section 7.3.6 of the manual – power
and transition settings).
WARNING!
The unit CANNOT be used as an incinerator.
6. Using the pellet boiler
Recommendations
Before starting up the unit, please check the following:
Make sure that the unit is properly connected to the power mains using the
230VAC power cable.

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Figure 9 –Electric power plug.
Check to see whether the pellet reservoir is supplied with pellets. Inside the pellet
reservoir is a safety grid to prevent users from reaching the worm screw.
Before each time you light up the boiler, make sure the burner is unobstructed.
The boiler's combustion chamber and door are made of iron painted with high
temperature-resistant paint; this will cause the releasing of fumes during the first
burning sessions due to paint curing.
Make sure the hydraulic circuit has been correctly assembled and that it is connected
to the water supply.
You should check that there is sufficient ventilation in the room where the unit is
installed; otherwise it will not work properly. You should therefore check to see
whether there are other heating air-consuming units in the room (e.g. gas units,
diesel boilers, etc.); these should not be used simultaneously with the unit.
The pellet boilers have a probe for measuring the room temperature. This probe is
attached to the grid on the rear panel (Figure 10). For a good reading of the room
temperature, avoid the contact between the end of the probe and the chassis of the
boiler. You may also attach the probe to the wall beside the unit.