Centrometal BioTec Plus 25 Owner's manual

TECHNICAL INSTRUCTIONS
for installation, use and maintenance
of hot water boiler and installation
additional equipment
BioTec Plus
HEATING TECHNIQUE
Centrometal d.o.o. - Glavna 12, 40306 Macinec, Croatia, tel: [phone], fax: [phone]
TU-BTP-05_1-2022-v1.10c-ENG
ENG
THE FIRST START-UP MUST BE DONE BY AUTHORIZED PERSON,
OTHERWISE PRODUCT WARRANTY IS NOT VALID.

These instructions are an integral part of this product. All rights reserved.
Reproduction of content of this document and transfer to third parties is
not allowed without written approval from manufacturer. Make sure the
instructions are always with the device, even if its sale / transfer of another
owner to the user or staff authorized for maintenance or repairs to consult.
i
READ THESE INSTRUCTIONS CAREFULLY BEFORE
INSTALLING THE BOILER TO HEATING SYSTEM!
Boiler must not be used by children or disabled persons (either
physicallyor mentally), as well as by person without knowledge or
experience, unless they are under control or trained by s person
responsible for their safety. Children must be supervised in the
vicinity of the product.
Boiler must not operate in flammable and explosive environment.
Before any work on the boiler, electric energy must be switched off.
Insufficient combustion air for chimney vent boilers with room air for
combustion can lead to dangerous conditions.
Make sure that the combustion air supply and discharge openings
are not reduced or closed off.
Keep doors to the boiler room closed.
Protect the boiler room and avoid rodents and birds from entering
and blocking the air openings.
Boiler cannot be placed in operation until above points are not met.
Important
Technical instructions BioTec Plus
2

BioTec Plus 35 45
TYPE:
(kW)
(kW)
(kW)
(Pa)
(l)
(°C)
(°C)
(°C)
(°C)
(kg/s)
(kg/s)
(kg/s)
(kg/s)
(h)
(h)
(°C)
(°C/bar)
(°C)
(mbar)
(%)
(l)
(mm)
(l)
(l)
(l)
(W)
(W)
(W)
(W)
(W)
(W)
(W)
(W)
(V~)
(Hz)
(A)
(kg)
(bar)
(bar)
(°C)
(mm)
(pcs.)
(R)
(R)
(R)
(R)
25
25
12,5-25
7,5-25
138
90-170
90-130
70-110
60-110
0,019
0,0206
0,010
0,0055
3,5
-
12,8
90
1,6
10,4
80
1100
110
60
5
1100
45
30
5
5,1
750
150
8
35
17 -3,5 5
10,2-35
167
90-170
90-130
70-110
60-110
0,022
0,030
0,012
0,0080
4
-
25,1
144
1,6
10,4
148
1100
116
68
5
1100
48
33
5
5,1
875
160
10
45
22,5-45
13,5-45
187
90-170
90-130
70-110
60-110
0,027
0,0385
0,014
0,0121
4
-
41,6
176
2,5
20,2
148
1100
122
75
5
1100
50
35
5
5,1
930
180
10
600×250×600 600×400×600 600×400×735
Boiler
connections
Flow and return pipe (male thread)
Charge/discharge (female thread)
Heat exchanger connector (male thread)
Connector of exchanger sensor (female thread)
WOOD: A by 303-5:2012; B by EN ISO 17225-5:2014-09
WOOD PELLETS: C1 by EN 303-5:2012; A1 by EN ISO 17225-2
Nominal heat output
Heat output range (wood)
Heat output range (wood pellets)
Boiler class (wood / wood pellets)
Required chimney underpressure
Water amount in boiler
Exhaust gas temperature at nominal heat output (wood)
Exhaust gas temperature at nominal heat output (wood pellets)
Exhaust gas temperature at minimal heat output (wood)
Exhaust gas temperature at minimal heat output (wood pellets)
Exhaust mass flow at nominal heat output (wood)
Exhaust mass flow at nominal heat output (wood pellets)
Exhaust mass flow at minimal heat output (wood)
Exhaust mass flow at minimal heat output (wood pellets)
Minimum operating time at rated power (nominal Q ) (wood)
N
Minimum operating time at rated power (nominal Q ) (wood pellets)
N
Min. inlet water tem. at the boiler supply water connection
Cold water tem. and pressure for safety heat exchanger
Setting range for temperature controller (wood / wood pellets)
Boiler resistance on water side at nominal output (dT=10°C)
Fuel moisture content
Fuel size
Fuel loading chamber capacity (wood)
Fuel loading chamber dimensions (D×W×H) (wood)
Firebox volume (wood pellets)
Combustion chamber volume (wood pellets)
Pellet tank volume
Combustion chamber type
Required minimum accumulation volume (tank) next to boiler
Maximal electrical power input (wood)
Auxiliray power requirements at Q (wood)
N
Auxiliray power requirements at Q (wood)
min
Standby power (wood)
Maximal electrical power input (wood pellets)
Auxiliray power requirements at Q (wood pellets)
N
Auxiliray power requirements at Q (wood pellets)
min
Standby power (wood pellets)
Supply voltage
Frequency
Max. electrical current
Current type
Total mass - (boiler with casing and accessories)
Max. operating overpressure
Test pressure
Max. operating temperature
Flue gas tube - external diameter
Number of turbulators
Heating appliance working
Heating appliance working
5
10
60
10-15°C / 2 bar
max. 90 / 65 - 90
max 25 % for wood, max. 12% for wood pellet
(450-550) x 70 x 50 for wood, fi6
underpressure
by EN 303:2012-point 4.4.6
230
50
~
2,5
5,5
90
6/4"
3/4"
3/8"
1/2"
with fan
under non-condensing conditions
Fuel type
Technical data
Technical instructions BioTec Plus 3

Dimensions, basic parts
BioTec Plus 25
VD
TU2
TI
RG
VC
C
C1
LS
VT
PR
A
KA TO TU1
PL
DO
PP
DM
KR
ST1 PV
B
ZP
BioTec Plus 45
B
KR
ST1 PV
ZP
A
DO
PP
DM
LS
KA TO TU1 PL
C
C1
VT
TU2
TI
RG
VC
PR
VD
BioTec Plus 35
KR
ST1 PV
B
ZP
A
KA TO TU1 PL
DO
PP
DM
TU2
TI
RG
VC
PR
VD
C
C1
LS
VT
C2
Technical instructions BioTec Plus
4

Dimensions, basic parts
INNER PARTS VIEW FOR BOILERS BioTec Plus 25-45
Boiler
dimensions
(A)
Depth
(B)
Width
(C)
Height
Other
dimensions
(C1)
Height
1450
1260
1585
1260
1450
1255
1450
760
1605
1055
1350
760
BioTec Plus 45
BioTec Plus 35
BioTec Plus 25
(C2)
Height -
1530-
CLEANING SET:
CC - Flue gas tubes cleaning brush
GG - Scraper for upper refractory stone (chamotte), flue gas chamber and
place around lower chamotte cleaning
GS - Scraper for cleaning of the lower refractory stone (chamotte)
ZN - Holder for cleaning set
GS CC
GG
ZN
Technical instructions BioTec Plus 5

LEGEND:
DM - Flue gas tube connection
DO - Cover of lower openings of the flue gas chamber
DS - Lower refractory stone (chamotte) (2 parts)
DV - Lower boiler door (wood)
EH - Electric heater (pellets)
FO - Photocell
GV - Upper boiler door (wood)
KA - Heat exchanger connection
(safety cooling system) (wood)
KR - Digital boiler controller
LS - Lambda probe
MA - Magnetic valve
ME - Cleaning mechanism assembly (pellets)
MP - Primary air actuator
MS - Secondary air actuator
MV - Upper door microswitch
OD - Air-vent
OL - Combustion chamber temperature sensor
PAD - Ash tray (wood)
PAP - Ash tray (wood pellets)
PB - Pellet burner
PL - Main flow
PO - Door for cleaning of pellet burner
PP - Filling / drainage
PR - Return flow
PS - Pellet tank cover
PT - Pressure switch
RG - Fuel level sensor (pellet)
RSE - Backfire protection valve (RSE)
SK - Main switch
SO - Casing cover (removable) for acces to electric
parts (pellets)
ST1 - Safety thermostat (wood)
ST2 - Safethy thermostat (wood pellets)
SV - Middle boiler door (wood)
TI - Heat exchanger output (safety
cooling system) (pellet)
TO - Thermal safety valve sensor
connection (safety cooling system)
(wood)
TU1 - Heat exchanger connection -
thermal safety valve connection
point (safety cooling system) (wood)
TU2 - Heat exchanger input (safety
cooling system) (pellet)
TV - Built-in thermal safety valve
(safety cooling system)
VC - Connection tube
VD - Opening for cleaning of the flue gas chamber
VR - Lower boiler door (pellet)
VT - Fan
ZL - Sheet metal protection cover (wood)
ZP - Flue gas tube cleaning lever
PV - Front boiler door
Basic parts
Technical instructions BioTec Plus
6

1.1. CHARACTERSTICS OF THE BioTec Plus BOILER
1.0. GENERAL
The BioTec Plus boiler is produced in compliance with the EN 303-5:2012 norm, which enables the
required level of functioning and minimal environmental pollution, through the firing with wood logs
and wood pellets. The system of flue gases conduction and their additional burning out, enables its
high efficiency, which makes this product extremely economical.
Widely sized left side fuel loading door enables firing with large pieces of wood logs and very simple
and easy cleaning and maintenance. The wood gasification principle enables a complete fuel burning
so maintenance of left part of the boiler is set to minimum. One filling of logs lasts up to 4 hours,
depend about nominal heat output. There is also a possibility of prolonging the firing process to the
entire day, if the heating requirement is decreased. The boiler can keep the glow up to 8 hours
(depends on the quality of the wood), during which period it is not necessary to repeat the start firing
process.
In the right side of the boiler is installed the burner for wood pellet firing with the automatic firing and
automatic self-cleaning function which enables the reliable operation also with the low quality wood
pellets.
The boiler must be connected to the central heating system with return flow protection and with
properly sized water accumulation (buffer) tank(s).
Boiler operation is managed with inbuilt boiler control unit using two boiler sensors, sensor in
combustion chamber, flue gas sensor and lambda probe, motors for primary and secondary air intake
for combustion and modulating underpressure fan on flue gases outlet from boiler. Boiler control unit
can run return flow protection, buffer tank management, one heating circuit with circulation pump and
3-way mixing valve with actuator steered by outdoor temperature sensor and room corrector and
DHW water heater tank pump.
With boiler BioTec Plus it is easy to handle, integrated control unit with color touch screen assures
reliable and simple boiler operation. With installed accumulation (buffer) tank excess of produced
heat is accumulated into the tank and can be consumed when needed. Because of accumulation
tank, firing of the wood can be planned in a reasonable time, and in the case of mild outside
temperature, space heating and DHW heating without firing boiler is also possible for several days, or
just start pellet side of the boiler.
The boiler is delivered together with thermal insulation, covered by a metal casing on two wood
pallets.
Steel hot water boiler BioTec Plus has two separate combustion chambers inside the common boiler
water chamber. Boilers BioTec Plus, nominal heat output 25, 35 and 45 kW, are designed for wood log
firing in left part and wood pellet firing in right part of the boiler. The wood gasification principle enables a
complete fuel burning in left part of the boiler. Logs up to 550 mm long can be inserted into the large
combustion chamber. The burning period of a single fill of logs is up to 4 hours, depend about nominal
heat output. The boiler can keep the glow even 8 hours, which means that in this period it is not
necessary to fire up the boiler in order to keep the heating process. In the right side of the boiler is
installed the burner for wood pellet firing with the automatic firing and automatic self-cleaning function
which enables the reliable operation also with the low quality wood pellets. Boiler operation is controlled
with inbuilt boiler control unit using two boiler sensors, sensor in combustion chamber, flue gas sensor
and lambda probe, motors for primary and secondary air for combustion and modulating underpressure
fan on flue gases outlet from boiler. Boiler must be connected to one adequately designed chimney and
to the central heating system with return flow protection and adequately designed water accumulation
(buffer) tank (CAS).
General, characteristics
Technical instructions BioTec Plus 7

All local regulations, including those referring to national and European standards need to be
complied with when installing the appliance. The boiler must not be modified unless using the tested
original accessories we provide or if the work is undertaken by our Customer Service. Only fit original
spare parts. These can be obtained from your customer service partner or directly from ourselves.
European standards need to be complied with when installing the appliance. Regular care and
cleaning of the appliance, flue gas outlets, connecting piece and flue.
CAUTION:
The flue may block if the boiler is heated again after a long period of it not being used. Before starting
the boiler, have the flue checked by a specialist (chimney sweep). Ensure sufficient supply of fresh air
in the installation room when heating. The air must be replaced at least 0.8 times an hour through
constant and reliable room venting. Fresh air may have to be provided from outside if the windows
and doors in the room where the boiler is installed are well sealed or if this room contains other
equipment, such as extractor hoods, clothes dryer, fan etc.
1.2. SAFETY PRECAUTIONS
1.3. IMPORTANT INFORMATIONS
This symbol indicates measures for protection against accidents and warning
for the user and / or exposed persons.
The boiler and related accessories are state of the art and meet all applicable safety regulations.
The control unit, wiring chamber, el. heater, safety cut-out STB thermostat, fan, grid cleaning
mechanism, flue gas tubes cleaning mechanism and pellet supply mechanism are integrated into the
BioTec Plus. They are operate at a voltage of 230V AC. Improper installation or repair can pose the
danger of life-threatening electric shock. Installation may beperformed only by appropriately qualified
technicians.
Caution symbols:
Please take careful note of the following symbols in this Operating Manual.
Concerning the specific need of sanitary hot water, the BioTec Plus boiler can be connected to one of
water heaters produced by our company. We suggest the combination with wall hanged SKB Digi or
LKB Digi water heaters, as well as with floor standing TB water heaters or accumulation (buffer) tanks
CAS-B. If the future connection to the solar system has been planned, boiler can be connected to
combined accumulation (buffer) tank CAS-BS or STB solar water heater. Boiler is tested and certified
according to the European standard EN 303-5:2012 and meets class 5. It is manufactured in
compliance with ISO 9001 and ISO 14001 standards.
Although the boiler has two separate furnaces, boiler connects to one properly selected chimney.
Safety precautions, important informations
Technical instructions BioTec Plus
8

1.4. WOOD GASIFICATION COMBUSTION PROCESS (wood side)
Combustion process is carried out in double combustion chamber in several phases. After filling the
upper chamber with logs, glow dry the logs, and at temperature 100÷300°C logs are beeing gasified.
The gases created in such process are mixed with the oxygen from air and burn out completely with
high temperature.
Fuel: wood logs with moisture content up to 20% (max. 25%), minimum size must be bigger than a
nozzle in refractory stone (chamotte) of the upper chamber. This demand for moisture content is
fulfilled with wood dried on air at least 12 months.
Wood pellets are used as fuel in right side of BioTec Plus boiler. Wooden pellets are bio-fuel made of
wooden wastes. Pellets can be packed in different packaging: in bags (15 kg or 1000 kg), or as bulk in
3
large (underground) tanks ( 4 - 15 m ) or in basement spaces. Recommended properties of pellets for
firing in BioTec Plus boilers are the following:
- heating value >= 5 kWh/kg (18 MJ/kg)
- diameter <= 6 mm
- max. moisture content <= 12 %
- max. dust content <= 1,5 %.
1.5. FIRING PROCESS IN WOOD PELLET SIDE
Wood gasification combustion process (wood side), firing process (pellet side)
Technical instructions BioTec Plus 9

2.0. DELIVERY PACKAGE
Delivery package
Boiler BioTec Plus is delivered in parts for easier transportation and mounting to boiler room.
Basic equipment is delivered seperately:
- left part of the boiler for wood firing with mounted thermal insulation (on wood pallet) with
inbuilt:
- color touch screen display control unit
- combustion chamber sensor - Temperature sensor - Thermocouple (32728)
- flue gas temperature sensor - Temperature sensor PT 1000 - Teflon l=1700 (62330)
- boiler sensor - Temperature sensor NTC 5K - PVC l=1000 (12041)
- lambda probe
- 2 actuators for primary and secondary air
- flue gas modulating fan
- microswitch for upper boiler door
- STB safety thermostat
- right part of the boiler for wood pellet firing with mounted thermal insulation (on wood
pallet) with inbuilt:
- photocell
- BOILER SENSOR - Temperature sensor NTC 5K - PVC l=1000 (12041)
- cleaning mechanism with movable grate
- pellet tank
- feeder screw
- backfire protection by rotation valve (RSE)
- pellet level sensor - Fuel level sensor CMSR 100 (26199)
- magnetic valve for air
- thermal safety valve
- electric heater
- pressure switch
- STB safety thermostat
- ash tray
- Additional sensors in basic delivery:
- 2 × Acc. (buffer) temperature sensor - Temperature sensor NTC 5K - PVC l=1000 (12041)
- 1 × Outdoor temperature sensor - Outdoor temperature sensor NTC 5K (31428)
- 1 × Main/Return flow sensor/hydraulic crossover- SET temperature sensor NTC 5K -
PVC l=2000 (32685)
- 1 × DHW sensor/hydraulic crossover - Temperature sensor NTC 5K - PVC l=2000 (26226)
- 1 × Room corrector (CSK) - Room corrector CSK (32680)
- cleaning brush, two scrapers and holder for cleaning set and portable ash tray (for left
part of the boiler (wood))
- set for connecting left and right side of the boiler: gasgets, screws, nuts.
- connection tube for connecting left and right side of the boiler
Technical instructions BioTec Plus
10

Recommendations for the VTC valve, circulation pump and water accumulator CAS - according
to the boiler output:
2.1. ADDITIONAL EQUIPMENT
Recommendations for the LTC units and the water accumulations (buffer) CAS - according to the
boiler output:
Minimum 50 litres / kW of boiler
25, 35
45
5/4''
--
--
6/4''
Heat output
range
(kW)
Connection
LTC 261
(internal thread)
Connection
LTC 271
(internal thread)
Volume of CAS accumulation
(buffer) tank for BioTec Plus
wood gasification boilers
Additional equipment is not included in basic delivery. Obligatory additional equipment
must be purchased seperately. Other additional equipment can be purchased optionally.
i
For closed heating systems:
- Thermal safety valve
- Safety-airvent group (2,5 bar)
- Expansion vessel for closed heating systems (size according the volume of heating installation,
including buffer tank volume)
For open heating systems:
- Open expansion vessel (size according the volume of heating installation, including buffer tank
volume)
2) OTHER ADDITIONAL EQUIPMENT:
1) OBLIGATORY ADDITIONAL EQUIPMENT:
- accumulation (buffer) tank for heating system (CAS (min. liter according to local regulation),
m ).inimum 50 litres / kW of boiler
- return flow protection - 3-way mixing valve with actuator (protection valve) or 3-way thermostat
valve (60°C) (like ESBE VTC 512, VTC 531, LTC 261, LTC 271).
25
35
45
5/4''
5/4''
5/4''
Alpha1 32-40
Alpha1 32-60
Alpha1 32-80
6/4''
6/4''
6/4''
Heat output
range
(kW)
Connection
VTC 512
(outer thread)
Connection
VTC 531
(internal thread)
Circulation pump type Volume of CAS accumulation
(buffer) tank for BioTec Plus
wood gasification boilers
Minimum 50 litres / kW
of boiler
Grundfos Wilo
Yonos PICO 30/1-4
Yonos PICO 30/1-6
Yonos PICO 30/1-8
Additional equipment
CAL alarm box
(light/speaker)
CM2K module
for regulation
2+ heating circuits
(max. 4 units.)
GSM alarm
module for
mobile network
Screw refill
(CPSP-BP 800 -
System for the
pellet supply
by the screw
transporter
from 800
lit. pellet tank)
Cm WiFi-box
(Internet
supervision)
Room corrector
(CSK-Touch)
- Automatic flue gas tubes cleaning
(Flue pass. Cleaner)
- Pellet suction system CVT + CentroPelet box (pellet feeding box)
- Pellet suction system CVT + Screw feeder
Technical instructions BioTec Plus 11

3.0. BOILER / ADDITIONAL EQUIPMENT POSITIONING AND ASSEMBLY
The positioning of the boiler has to be carried out the authorized person. We suggest the positioning
on the solid concrete basis, which height is between 50-100 mm. The boiler room has to be absolutely
protected from freezing and properly ventilated. The boiler has to be positioned in order to enable its
connecting to the chimney (see point 3.) and heating installation as well as its servising during the
functioning process, cleaning and maintenance (Figure 1). The connection of the boiler to the central
heating system is obligatory with the one or more CAS water accumulations (buffer) tanks,
depending of the boiler's power. It is recommended to connect minimum 50 liters water
accumulation to each 1 kW boiler power (i.e. for the 45 kW boiler minimal water accumulation
should be 2.250 liters). The boiler should not be used without being connected to the water
accumulation tank. It must be connected to the CAS water accumulation obligatory with return flow
protection through an 3-way mixing valve with actuator (protection valve) or 3-way thermic valve
(like ESBE VTC 512, VTC 531 (60°C), LTC 261, LTC 271 (60°C)).
WARNING!
Flammable items must not be placed on the boiler and within the minimum distances shown
in Figure 1.
Figure 1. Minimum distance from the boiler room walls
*valid for closest tank to the wall
Boiler / additional equipment positioning and assembly
Technical instructions BioTec Plus
12

3.1. INSTALLATION OF DELIVERED PARTS
BioTec Plus is delivered on two wooden pallets. It must be mounted like is described on next pages of
these technical instructions. After the boiler is mounted, should be positioned in the boiler room (see
point 2.0.). Base protection with stone wool push under the boiler as shown in figure 2.a.
In upper chamber of the left side of the boiler are delivered (figure 2.b):
1. holder for cleaning set and 2 cleaning scrapers and cleaning brush
2. room corrector and sensors (2 Acc. (buffer) temperature sensors, 1 return flow sensor, 1 DHW
temperature sensor, 1 outdoor temperature sensor)
Holder for cleaning set can be positioned on lateral side of the boiler (A) or to the wall (B), near the
boiler and easy accessible. On this holder should be placed cleaning set (2 scrapers and brush).
Sensors and room corrector should be connected according heating installation and connecting
scheme.
CHECKING FLUE GAS CHAMBER LID
Before connecting of left (fuel: wood) and right (fuel: wood pellets) sides of boiler is necessary to
check if is right flue gas chamber lid it properly tight. Remove casing cover lid and additionally tight
screws on flue gas chamber lid (like is shown on figure below). Acces to right flue gas chamber will be
disabled after connection left and right side of the boiler.
Installation of delivered parts
Technical instructions BioTec Plus 13

CONNECTING LEFT AND RIGHT SIDE OF THE BOILER
Left part of the boiler
(fuel: wood)
Right part of the boiler
(fuel: wood pellets)
Detail 1 Detail 2
Detail 1 Detail 2
Prepared flange with holes on left part
of the boiler. First hole (left) have circle
shape, other five holes are slitted (have
possibility for height niveling).
Prepared flange on right side of the
boiler. Flange have factory glued
gasket and factory mounted six screws
M12.
Connecting
Technical instructions BioTec Plus
14

Connecting
STEP 1:
Sheet metal protection
cover
BioTec Plus - left part of the boiler section view
Remove sheet metal protection cover through the upper boiler door.
STEP 2:
0°
0°
It’s necessary draw closer left side of the boiler to right side of the boiler. Screws from flange on right side
of the boiler must get into flange holes on left side of the boiler.
Technical instructions BioTec Plus 15

Connecting
- fixed hole
- bigger holes
Flange has 1 fixed hole and 5 bigger holes
to be able to level righ part of the boiler body.
A - hole with circle shape; other holes are slitted for height niveling possibility. Screws from flange on
right side of the boiler must get into flange holes on left side of the boiler like is shown on figure
below.
BioTec Plus - left part of the boiler section view
A
Technical instructions BioTec Plus
16

Connecting
STEP 3: BioTec Plus - left part of the boiler section view
Put washer, toothed washer and nut on screw like is showned on figure above (B). Tight nut but not
completely tight. Level the body of the right part of the boiler with 4 leveling screws.
STEP 4: BioTec Plus - left part of the boiler section view
Put washers, toothed washers and nuts on all other screws and start tigth them. If is needed, nivel boiler
(holes are slitted for niveling).
Thight hard all six nuts.
Technical instructions BioTec Plus 17

STEP 5:
Left and right side of the boiler have adjustable foots. Adjust it if is necessary. Boiler foots must touching
boileroom floor. Level left part of the boiler (wood) front right screw is fixed and leveling must be done by
other 3 adjusting screws.
- Leveling screw - fixed
- Leveling screws - adjustable
PELLET SIDE COVER ADJUSTMENT - FRONT SIDE
A
Right boiler part has adjustible cover.
Cover is fixed with screws. To be able to
allign it with left boiler cover, screws
must be unscrewed. (note: cover can be
adjusted only left-right).
To have acces to the middle fixing screw
remove el-mag. valve cover (A)
Connecting
Technical instructions BioTec Plus
18

C
BB
NOTE: on front side, left and right corner porters are separate adjustable.
In some cases there are 3 screws on the left and
rigt lover adjusting positions (B). Remove the
middle screws and unscrew the upper and lower
screw (don’t remove this 2 screws). Also in some
cases there can be 2 screws in the upper
adjusting position (C). Remove the screew that
is in small hole and unscrew the screw that is in
big hole (don’t remove screw in big hole)
After adjusting right boiler part cover according
to the left boiler part cover, fix it with 4 lower and 1
upper screw.
PELLET SIDE COVER ADJUSTMENT - BACK SIDE
On the back side remove lower cover to have access to the screws for adjusting the back part of
the cover.
Unscrew 2 M8 screws (don’t remove them) to be able
to adjust back side of the cover (left-right). After
adjusting the cover according to the left boiler part
cover, fix it with 2 M8 screws.
NOTE: on the back side, left and right corner porters
are connected with lower part and adjusted together.
Connecting
Technical instructions BioTec Plus 19

D
D
Push the left boiler part cover to the right boiler part
cover and fix them together with L-profile part and 4
screws (D).
E
PELLET SIDE COVER ADJUSTMENT - COVER DOOR
Front cover door of right boiler part can be
adjusted with the lower adjusting screw so it is
alligned with the rest of the cover.
Unscrew M8 screw (don’t remove it) to be able to
adjust lower porter of the cover door (left-right).
After adjustig, fix it with M8 screw.
Connecting
Technical instructions BioTec Plus
20