Centrometal Bio-Tec Series User manual

Bio-Tec
TUBT253545-07/2012-eng
For assembling, use and maintenance
of the boiler
and additional equipment
TECHNICAL MANUAL
Centrometal d.o.o. - Glavna 12, 40306 Macinec, Croatia, tel: [phone], fax: [phone]
HEATING TECHNIQUE
HEATING TECHNIQUE
www.centrometal.hr
e-mail: [email protected]
Centrometal d.o.o. Glavna 12, 40306 Macinec, Croatia
maloprodaja tel: [phone]
centrala tel: [phone], fax: [phone]
Centrometal d.o.o. shall not be responsible for possible incorrect data caused by printing errors or error made in transcription and all figures and
diagrams are for explanatory purposes only and relevant adjustment have to be made at the spot. In any case, it reserves the right to modify its products
as deemed to be required and useful without any prior notification.
The fuel to be used is only wood under 25% humidity content (wood dried min. 1 year).
The outlet temperature always has to be over 60°C. This can be reached by obligatory connection of the
3-way thermic valve ESBE VTC 512, VTC 531, LTC 141 or Laddomat 21, which blocks the boiler
temperature fall under the 60°C level.
The connection of CAS water accumulators is obligatory. It is recommended to connect min. 50 liters
water accumulation to each 1 kW of boiler power.
To the closed central heating system an expanding vessel has to be connected (the volume of the
expanding vessel is about 10% of the installation volume).
To the open central heating system an open expanding vessel has to be conneced (OPC), which volume
has to be about 7% of the installation volume.
IMPORTANT !
Open upper boiler door (and close bottom if they open).
Put fine chopped wood to the top chamber, on refractory stone (chamotte) over the burner nozzle so
that the nozzle is not obstructed, then put crumpled paper for ignition and fill the top chamber with fuel
(split logs).
Close upper boiler door.
Turn the MAIN SWITCH on.
Push the button START (the LED diode flutters).
Open the middle door and ignite paper.
Couple minutes after fine chopped wood starts burning, close the middle door.
Push the button START (the LED diode lights).
(Only for Bio-Tec 25) place the button RP into position " "
(Only for Bio-Tec 25) leave the button RP in position " " at least 1 hour or longest to the next charge
with wood and then restore it in the left position.
(The above actions are for ignition of the boiler from cold state (without glow). These measures should
be implemented always when we don’t have, or don’t have enough glow, and we will load the wood).
After the regulation starts to display the lack of fuel , the fuel should be refilled (if it is necessary to
continue the heating process)-BEFORE REFILLING, press START button ones, when upper chamber
is full with wood and all doors are closed press button START for second time.
It is not recommended to open the boiler's door while the light is NOT on.
When refill the boiler with fuel the main switch must be turned on. When the firing process is over, we
can turn off the main switch, but first it is necessary, after the indication ''FUEL'' is turned on, to
wait that the boiler cool down under 65°C and the glow disappear in combustion chamber. Ater that the
main switch on the control boiler unit may be turn off (see point 7.0.).
USE OF THE BOILER - QUICK OVERVIEW (see details under the point 6.0, 6.4., 10.0.)

31
Notes
2
TECHNICAL DATA
(A1)
(B1)
(C1)
Bio-Tec 45
(mm) recommendation: 500x70x50
max. 550x100x100
(A)
(B)
(C)
Bio-Tec 25
25
12-25
3
14
105
170
100
0,022
-
0,754
9
3,5
wooden logs
-
12-20
97
235x250
890x600x250
134
1290
595
1285
1290
595
1345
420
450
150
80
765
1085
430
685
600
-
25
45
-
3
21
110
180
-
0,025
-
1,083
14
4
wooden logs
-
12-20
175
235x400
1130x600x400
272
1290
725
1525
1290
725
1580
570
610
180
80
1250
1320
540
685
600
140
44
(kW)
(kW)
(Pa)
(lit.)
(°C)
(°C)
(kg/s)
(kg/s)
(kW)
(mbar)
(h)
(kW)
(%)
(l)
(mm)
(mm)
(l)
(lit./kW)
(W)
(°/bar)
(V~)
(Hz)
(mm)
(mm)
(mm)
(mm)
(mm)
(mm)
(kg)
(kg)
(bar)
(bar)
(°C)
(mm)
(R)
(R)
(R)
(R)
(mm)
(mm)
(mm)
(mm)
(mm)
(mm)
(mm)
(mm)
by EN 305-5 point 4.2.5
250
10-15°C, 2 bar
230
50
~
-
515
2,5
5,5
90
6/4"
1/2"
3/8"
1/2"
80
685
600
underpressure
Bio-Tec 35
35
-
3
18
96
180
-
-
-
-
-
4
wooden logs
-
12-20
144
235x400
940x600x400
226
1290
725
1330
1290
725
1385
150
1040
1130
540
130
44
Technical manual Bio-Tec
TYP
Other
dimensions
Technical data
Nominal heat output
Heat output range
Boiler class
Required chimney underpressure
Water amount in boiler
Exhaust gas temperature at nominal heat output
Exhaust gas temperature at minimum heat output
Exhaust mass flow at nominal heat output
Exhaust mass flow at minimum heat output
Standby heat losses
Boiler resistance on water side at nominal output
Combustion period at nominal output
Fuel type
Maximum heat input
Fuel moisture content
Furnace volume
Wood feeding opening AxB
Combustion chamber dimensions
Combustion chamber volume
Combustion chamber type
Required minimum accumulation next to boiler
Electrical power input
Temp. and press. of water from water supply line into heat exchanger
Supply voltage
Frequency
Current type
Boiler body mass
Total mass - (boiler with casing and accessories)
Max. operating overpressure
Testing pressure
Max. operating temperature
Flue gas tube – external diameter
Fuel size
Boiler
connections
Flow and return pipe (male thread)
Charge/discharge (female thread)
Heat exchanger connector (male thread)
Connector of exchanger sensor (female thread)
C2
C3
C4
B1
A1
L
L1
L2
Technical manual Bio-Tec
Dimensions
of the boiler
body
Boiler
dimensions
with casing
Lenght
Width
Height
Total lenght
Total width
Total height

GS CC
GG
ZL
DS
ZZ
BL
B1
B
PZ
ZP
DV
KR
GV
SV
ST
A
A1
C4
L
DO
PV
PP
L2
DC
GO
KA
TO
TV 60
3
C2 C3
C5
C=C1
L1
VT
PL DM
RP
30
VD
GS CC
GG
ZP
SV
GO KV
DC
PD
GO
DO
DN DN
VI
DT
TU
OS
ZO
A
ZO
DT
TU
OS
BL
VT VP
VD
PD
NV
DO
DO
Bio-Tec 35/45 Bio-Tec 25
Technical manual Bio-Tec Technical manual Bio-Tec
Dimensions of the boiler, basic parts
DIMENSIONS AND BASIC PARTS OF THE BOILER
Detail 1. - Flue gas tube
cleaning lever
Detail 2. -
flue gas chamber cleaning
Lower opening lid for
Detail 3. - regulation of the primary air,
(used in ignition phase)
(Only for Bio-Tec 25), (35/45
do not have regulation button)
-
-
-
-
-
-
-
-
-
-
-
-
KR
GV
SV
ZP
PZ
DV
PL
DM
VT
PV
PP
ZL
Digital boiler regulation
Upper boiler door
Lower boiler door
Inlet
Flue gas tube connection
Fan
Outlet
Filling / draining
Sheet metal protecting cover
Middle boiler door
Flue gas tube cleaning lever (can be
installed on the left or right boiler side)
Primary and secondary
air opening lid
LEGEND:
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
KA
TO
TV
DO
GO
DS
ZZ
DC
GS
GG
CC
ST
BL
RP
VD
Heat exchanger connection - draining to the sewage
Thermal safety valve sensor connection
Heat exchanger connection - thermal safety valve connection point
Cover of the lower openings the flue gas chamber
Upper opening for flue gas tube cleaning
Lower refractory stone (chamotte) (2 parts)
Regulation of primary and secondary air
Flue gas chamber with tubes and turbulators
Poker for cleaning of the lower refractory stone (chamotte)
Poker for upper refractory stone (chamotte) and flue gas channels cleaning
Flue gas tubes cleaning brush
Safety thermostat
Lateral sides of bottom chamber
(Only for Bio-Tec 25) regulation of primary air
(used in ignition phase)
Opening for cleaning the flue gas chamber
ZP -
DO -
SV -
BL -
GO -
KV -
DC -
Lever for cleaning of flue gas tubes
Bottom openings for cleaning of
flue gas chamber
Middle boiler door
Lateral sides of the bottom fire place
Top opening for cleaning of
flue gas tubes
Fan box
Flue chamber with flue gas tubes
and turbulators
VT -
VP -
NV -
PD -
VD -
DN -
VI -
OS -
Fan
Fan blade
Fan flange holder
Top back casing cover
Lid of opening forflue gas
box cleaning
Turbulator holder support
Screw and nut M8
DT - Turbulator support
Shaft
OS -
TU - Turbulator (4
GS -
CC -
GG -
Shaft
pcs. for Bio-Tec 25)
Poker for cleaning of bottom refractory
stone (chamotte)
Brush for cleaning of flue gas tubes
Poker for cleaning of the top chamber
and flue gas passage
ZO - Wire fuse f3 DIN 11024
Cleaning and mainternance of the boiler
Image 12. - Cleaning of Bio-Tec 25
Detail A
Screw M8
(4 pcs.)
Screw M8
(2 pcs.)
Fan flange
Screw

429
GS CC
GG
ZP
SV
VT VP
VD
PD
GO
Screw
KV
DC
NV
DO
DO
PD
GO
DO
DN DN
VI
DT
TU
OS
ZO
A
ZO
DT
TU
OS
BL
Technical manual Bio-Tec Technical manual Bio-Tec
In general, characteristics
1.0. IN GENERAL
Steel boilers Bio-Tec, with an rated thermal output 25, 35 and 45 kW are
constructed for wood firing and aimed for heating of small and middle sized
premises. Due to the applied wood gasification principle, wood is totally burned.
Widely sized combustion chamber enables the firing with wood pieces of 500 mm.
One filling period lasts min. 4 hours, with the possibility of prolonging it to the whole
day, if the heating requirement is decreased. Boiler has the option of maintaining
the glow up to 12 hours, making unnecessary to perform firing process in case you
want to continue firing. The functioning of the boiler is steered by the built-in digital
regulation system. The boiler must be connected to the central heating system
through an appropriate number of the CAS water accumulators.
1.1. CHARACTERISTICS OF THE Bio-Tec BOILER
The Bio-Tec boiler is produced in compliance with the EN 303-5 norm, which
enables the required level of functioning and minimal environmental pollution,
through the firing with wood. The system of
flue gases conduction and their additional burning out, enables its high efficiency,
which makes this product extremely economical. Widely sized combustion
chamber door enables firing with large pieces of wood and a very simple and easy
cleaning and maintenance. One filling period lasts minimum 4 hours, depending on
the nominal thermal 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 12 hours, during which period it is not necessary to repeat the
firing process. The flue gases leading system is good optimized. The boiler must be
connected to the central heating system through the CAS water accumulators. An
integrated digital regulation system steers the functioning of the boiler, steers the
circulation pump integrated inside the primary heating circuit (boiler-water
accumulator), steers the circulation pump in the heating circuit (water accumulator-
radiators) and steers the sanitary water pump. The steering system leads the
information related to the necessity of the additional fuel filling towards the
regulation and the room thermostat. The Bio-Tec boiler is very simple to handle,
while the built-in regulation enables its reliable functioning. Through the
compulsory connection of the CAS water accumulator to the heating system, the
optimal functioning of the boiler is achieved and the produced heat is saved, which
enables consumption exactly according to the need. The firing process can be
implemented in suitable period of the day. If the outdoor temperature is not very low,
the room heating and the sanitary hot water production can be extended to the
period of few days. The boiler is delivered together with thermal insulation, covered
by a metal casing and it is pre-wired.
The boiler is aimed for firing with wood.
Cleaning and mainternance of the boiler
Image 11. - Cleaning of Bio-Tec 35/45
Detail A
Screw M8
(4 pcs.)
Screw M8
(2 pcs.)
Fan flange
ZP -
DO -
SV -
BL -
GO -
KV -
DC -
Lever for cleaning of flue gas tubes
Bottom openings for cleaning of
flue gas chamber
Middle boiler door
Lateral sides of the bottom fire place
Top opening for cleaning of
flue gas tubes
Fan box
Flue chamber with flue gas tubes
and turbulators
VT -
VP -
NV -
PD -
VD -
DN -
VI -
OS -
Fan
Fan blade
Fan flange holder
Top back casing cover
Lid of opening forflue gas
box cleaning
Turbulator holder support
Screw and nut M8
DT - Turbulator support
Shaft
OS -
TU - Turbulator
GS -
CC -
GG -
Shaft
5 pcs. for Bio-Tec 35,
5 pcs. for Bio-Tec 45)
Poker for cleaning of bottom refractory
stone (chamotte)
Brush for cleaning of flue gas tubes
Poker for cleaning of the top chamber
and flue gas passage
ZO - Wire fuse f3 DIN 11024

5
28
PL
PL
PL
PL
PD PD PD
PD
Technical manual Bio-Tec Technical manual Bio-Tec
Concerning the specific need of sanitary hot water, the Bio-Tec 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
standing TB water heaters and STEB solar water heaters, if the future connection to
the solar system has been planned as also CAS-B or CAS-BS, combination of
accumulation tank and stainless steel DHW tank.
Wood gasification, delivery package, additional equipment
1.2. THE WOOD GASIFICATION COMBUSTION PROCESS
The process is carried out in double combustion chamber in several phases. After
fuel supply and fuel drying follows the outgasing at the temperature 100 to 300°C.
The burning gases and different C H joints are drawn out of the wood. The gases
x y
created in such a process are mixed with the air and burn out creating high
temperature.
This demand for
moisture content is fulfilled with wood dried on air at least 12 months.
Fuel: wood having moisture content to 20% (max. 25%), minimum size bigger than
a nozzle in refractory stone (chamotte) of the top chamber.
1.3. DELIVERY PACKAGE
3-way thermic valve ESBE VTC 512 (maintains minimum temperature of return
water into the boiler above 60°C), VTC 531 (maintains minimum temperature of
return water into the boiler above 60°C), LTC 141 (maintains minimum temperature
of return water into the boiler above 60°C) or Laddomat 21 (maintains minimum
temperature of return water into the boiler abov 63°C) and the water accumulator
CAS / CAS-S / CAS-B / CAS-BS are obligatory.
Bio-Tec boiler (covered with casing with thermal insulation, built in boiler control
unit and room thermostat (delivered in the boiler)), cleaning brush and poker for
lower refractory stone, as well as for the flue gas channels and upper
combustion chamber cleaning, two lids of bottom openings of the flue gas
chamber and the flue gas tube cleaning lever.
1.4. ADDITIONAL EQUIPMENT
Image 10. Examples of inlet construction
PD - Top back casing cover
PL - Inlet
Examples of inlet construction

6
min. 1000 mm
min. 500 mm
*min. 1000 mm
min. 1500 mm
min. 700 mm
27
Technical manual Bio-Tec Technical manual Bio-Tec
Boiler / additional equipment positioning and assembly
2.0. BOILER / ADDITIONAL EQUIPMENT POSITIONING AND ASSEMBLY
The allocating of the boiler has to be carried out by the authorized person. We
suggest the allocation 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 set up in order to enable its connecting to
the chimney (see point 3.) as well as its servising during the functioning process,
cleaning and maintenance (Image 1). The connection boiler to the central heating
system is obligatory through the one or more CAS water accumulators,
depending of the boiler's power. It is recommended to connect 50 liters water
accumulation to each 1 kW boiler power (i.e. for the 45 kW boiler minimal water
accumulation should be 2250 liters). The boiler should not be used without being
connected to the water accumulation tank. It must be connected to the CAS water
accumulator exclusively through an 3-way thermic valve ESBE VTC 512 (maintains
minimum temperature of return water into the boiler above 60°C), VTC 531
(maintains minimum temperature of return water into the boiler above 60°C),
LTC141 (keep minimal temerature of return water into the boiler above 60°C) or
Laddomat 21 (maintains minimum temperature of return water into the boiler above
63°C).
WARNING!
Flammable items must not be placed on the boiler and within the minimum
distances shown in Figure 1.
Image 1. Minimum distance from the room walls
*valid for closest tank to the wall
Cleaning and mainternance of the boiler
Cleaning of the flue gas chamber with flue gas tubes (Image 11.-DC):
- remove top back cover of the boiler casing (Image 11.-PD).
- unscrew four M8 nuts and remove the lid of top opening for flue gas tube
cleaning (Image 11.-GO).
- take out the wire fuse (Image 11.-ZO).
- unhook turbulator holder (Image 11.-DT) together with turbulators (Image 11.
-TU) from the shaft (Image 11.-DN).
- take out the turbulator holder (Image 11.-DT) together with turbulators (Image
11.-TU) from the flue gas chamber.
- clean flue gas tubes using a brush (Image 11.-CC) supplied with the boiler.
- remove turbulators (Image 11.-TU). from the turbulator holder (Image 11.-DT).
- clean spiral turbulators (Image 11.-TU) and place them back together with the
turbulator holder (Image 11.-DT) into flue gas tubes.
- hook the turbulator holder (Image 11.-DT) onto the shaft (Image 11.-DN).
- place back the wire fuse (Image 11.-ZO).
- place back the lids of bottom openings for the flue chamber cleaning (Image
11.-GO) to their original place and tighten them using screws (as before
removal) to get good air tightness during boiler operation.
- put the top back cover of the boiler casing (Image 11.-PD).
- take out the lids of lower openings for cleaning the flue gas chamber
(Image 11-DO).
- clean flue gas chamber throught the lower openings for cleaning
(Image 11- DO).
- place back the lids of lower openings for cleaning (Image 11.-DO) to its original
place and tighten them using screws to get good air tightness during boiler
operation.
In order to clean the boiler, there is no need to remove the refractory stone
(chamotte).

7
26
A
Bio-Tec
35/45
Bio-Tec 25
Covers (DO) of the the lower
openings the flue gas chaber adjust
on to foresee place (detail A).
For the proper operation of the
boiler it is IMPORTANT to hard
tighten the doors how it to seal
perfectly !!
DO
Technical manual Bio-Tec Technical manual Bio-Tec
Installation of moving parts
2.1. INSTALLATION OF MOVING PARTS
Bio-Tec movable parts are delivered packed as a set within the top boiler chamber.
After the boiler is placed in the boiler room, installation of movable parts is carried
out (page 3, DO- two lids of bottom openings of the flue gas chamber and ZP-lever
for cleaning of flue gas tubes). The lid of bottom openings of the flue gas chamber
has to be fixed by two screws to the boiler body to achieve good tightness to prevent
air penetration during boiler operation (see Image 2). The flue gas tube cleaning
lever can be installed either on the left or on the right boiler side with screws M8 onto
the prepared holder (page 3).
Image 2. (DO)Mounting of lower opening covers for flue gas chamber cleaning
Lateral openings
for cleaning the
flue gas chamber
Detail A:
Cleaning and mainternance of the boiler
11.0. CLEANING AND MAINTENANCE OF THE BOILER
Protective gloves must be used (see Image 9). Ash remaining in boiler after solid
fuel firing should be disposed into metal containers with a cover.
(press button ''START''
As through the
wood gasification principle the fuel burns out totally, the cleaning of the boiler is
limited to the upper and lower combusting chamber once in a week and the cleaning
of flue gas tubes (DC - page 3) on the back side of the boiler is necessary only after
the heating season, i.e. min. once in one heating season.
Before each starting of the boiler ) it is reccomended
to shake the flue gas tube cleaning lever few times (Image 11 - ZP).
Cleaning the fan blade VP
and fan box has to be performed when necessary.
Cleaning of lower and upper part of the combustion chamber:
- to be performed by a poker delivered with the boiler.
- it is necessary to take care, at cleaning the lower combustion chamber, to clean
latteral sides of the lower combustion chamber well, in order to provide as better
heat exchange and maximum boiler efficiency, as possible (Image 11,-BL).
Cleaning of fan blades (Image 8.-VP):
- unscrew four M8 nuts by which the fan flange is fixed to the boiler (Image 11).
- pull out the fan (Image 11.-VT) with the flange along the flange holder
(Image11.-NV) and turn it to the left to access the fan blade (Image 11.-VP).
- then, remove all deposits of ash and impurities from the blade.
- put the fan together with the flange back on four M8 screws and tighten them
with four M8 nuts to get good air tightness during operation.
Cleaning of the fan box (Image 11.-KV):
- unscrew two M8 nuts and remove the fan box lid with gasket (Image 11.-VD).
- remove ash and impurities from the fan box.
- place back the fan box lid (Image 11.-VD) with gasket on two M8 screws and
tighten them with two M8 nuts to get good air tightness during operation.

825
Boiler use
- Close upper boiler doors. (see image 7)
- Turn the MAIN SWITCH on. (see Point 7.0)
- Push the button START (the LED diode flutters). (see Point 7.0)
- Open the middle door and ignite paper (see Image 7)
- Couple minutes after fine chopped wood starts burning, close the middle door.
(see Image 7)
- Push the button START (the LED diode lights) (see Point 7.0)
- (Only for Bio-Tec 25) place the button RP (see page 3) into position " "
- (Only for Bio-Tec 25) leave the button RP (see page 3) in position " " at least 1
hour or longest to the next charge with wood and then restore it in the left position.
The above actions are for ignition of the boiler from cold state (without glow).
These measures should be implemented always when we don’t have, or don’t
have enough glow, and when we will load the wood.
After the regulation starts to display the lack of fuel , the fuel should be
refilled (if it is necessary to continue the heating process)-BEFORE REFILLING,
press START button ones.
FUEL REFILLING PHASE:
- open the upper boiler door (see Image 7)
- align glow with poker
- insert fuel (recommended to fill the full firebox) (see Image 8)
- close the upper boiler door (see Image 7)
-press button START for second time. (see Point 7.0)
NOTE:
- During the process of refilling the fuel the main switch of the boiler has to be
turned on. When the firing proces is over we can turn off the main switch, but first
it is necessary, after the indication ''FUEL'' is turned on, to wait that the boiler
cool down under 65°C and the glow disappear in combustion chamber (see point
7.0.).
min. 500 mm
10mm
H
H
H - Useable chimney height
Technical manual Bio-Tec Technical manual Bio-Tec
Connection to the chimney, fresh air opening
3.0. CONNECTION TO THE CHIMNEY
Properly calibrated and built chimney is the precondition for a safe operation of the
boiler and economic heating. The chimney has to be good insulated, gas-proof and
smooth. On the lower part of the chimney, a cleaning door has to be built in. Brick
layed chimney has to have 3 layers with an stone wool thermal insulation in the
middle. The thickness of the insulation should be 30 mm, if the chimney is situated
inside the building, i.e. 50 mm if the chimney is situated outside the building. Inside
chimney diameter dimensions depend on its height and on the boiler
capacity (Image 5.). The temperature of the flue gases on their exit point should be
minimum 30°C higher then the temperature of their condensating point. The choice
and the construction of the chimney should be performed by an authorized person.
Minimal distance between boiler and the chimney is 500 mm. The flue gas tube has
to have an inclination of 30-45° (Image 4.). In order to unable entering of the
condensate from the chimney into the boiler, 10 mm of the flue gas tube length has
to be inserted deaper inside the chimney. It is recommended to insulate the
chimney connection tube with a mineral wool of 30-50 mm thickness. All
installation works must be made in accordance with valid national and European
standards. At connecting a boiler to the chimney, flue gas tubes and elbows must
not pass behind the fan since in that case the cleaning and maintenance will not be
possible. An example of incorrect position of flue gas tubes and elbows in relation to
the fan is presented at the Image 3.
Image 3. - Possible connecting of the Bio-Tec boiler to the chimney
Opening for the cleaning
Thermal insulation
Possible way of connecting to the chimney of the
Bio-Tec boiler (recommendation)
Possible way of connecting
to the chimney of the Bio-Tec boiler
(Only Bio-Tec 35/45)
Opening for the cleaning
Thermal insulation

9
24
Boiler must not be used in flammable and explosive environment. It must not be
used by children or disabled persons (either physically or 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. Protective gloves must be used (Image 9).
Fuel with max. 25% moisture content may be used.
Before starting up it is necessary to check following:
- if the fresh air access to the boiler room is available (Point 4.0).
- if the boiler and the whole system are properly filled with water and airvented.
- if the safety elements are properly connected and are functioning perfectly:
- closed central heating systems should have safety valve of max. 2,5 bar, thermal
safety valve and expansion vessel of min. volume which is not less then 10% of the
total water quantity in the system.
- open central heating systems should have an open expansion vessel of min.
volume which is not less then 7% of the total water quantity in the system situated
enough over the level of the highest radiator in the system and insulated, if it is
mounted outside of heated space.
- if the mobile elements of the boiler are properly positioned:
- sheet metal protecting cover (ZL-page 3) have to be fixed to the carriers in the
upper combustion chamber.
- pieces of the lower refractory stone have to be situated into the deposits on the
lower wall of the combustion chamber (DS-page 3).
- turbulators (TU-page 28) have to be fixed inside the flue exhaust tubes
(DC-page 3).
- air damper (PZ-page 3) for secondary and primary air.
- if movable elements-two lids of bottom openings of the flue gas chamber and flue
gas tube cleaning lever.
Firing has to be performed according to the instructions described in this manual
(See points 6.0 to 6.4) and Technical manual ‘’Digital boiler regulation Bio-Tec’’.
If you are sure that energy from boiler will be consumed, made firing up for one filling
of the upper combustion chamber.
IGNITION PHASE AND FIRST FUEL CHARGING:
- Open upper boiler doors (and close bottom if they open) (see Image 7)
- Put fine chopped wood to the upper chamber, on refractory stone (chamotte) over
the burner nozzle so that the nozzle is not obstructed, then put crumpled paper
for ignition and fill the top chamber with fuel (split logs). (see Image 7, Image 8). 10
15
20
25
30
35
40
45
50
60
70
80
90
100
110
5 10 15
18
20
22
25
30
35
6 7 8 9
An example of the chimney selection:
boiler output:
Fuel: wood
required useable chimney height
required inner chimney diameter
boiler output:
Fuel: wood
required useable chimney height
required inner chimney diameter
boiler output:
Fuel: wood
required useable chimney height
required inner chimney diameter
- 25 kW
-
- : H=8 m
- : 18 cm
- 35 kW
-
- : H=8 m
- : 20 cm
- 45 kW
-
- : H=8 m
- : 22 cm
Bio-Tec 35/45 Bio-Tec 25
Technical manual Bio-Tec Technical manual Bio-Tec
Connection to the chimney, calibrating of the chimney
Image 4. Incorrect connecting the boiler to the chimney
Fan
Flue gas elbow
Flue gas tube
Image 5. - Calibrating of the chimney for Bio-Tec boilers
Useable chimney height - from flue gas tube connection
to the top of chimney
Inner chimney diameter - interior chimney diameter.
Nominal thermal output of the boiler (kW)
Useful height of the chimney (m)
wood fireing
Inner diameter of the chimney (cm)
Boiler use
10.0. BOILER USE

10 23
LT
Lmax
LT
DR
DR
DR
RV
RV
Technical manual Bio-Tec Technical manual Bio-Tec
Each boiler room must be equipped with an opening for supply of make up air
which is dimensioned in accordance with boiler output (minimum opening area
according to the below shown equation). Such opening must be protected with a net
or grate. All installation works have to be performed in accordance with valid
national and European standards. Boiler must not operate in flammable and
explosive environment.
4.0. FRESH AIR OPENING
Q - boiler output in kW
2
A - opening area in cm
A = 6,02 Q
Connection to the central heating system
Connection to the open central heating system
5.0. CONNECTION TO THE CENTRAL HEATING SYSTEM
All installation works must be made in accordance with valid national and European
standards. Boiler Bio-Tec can be built to closed and open central heating systems.
In both cases boiler must be fired with wooden logs. Installation has to be made, in
according to technical standards, by a professional who will be responsible for
proper boiler operation. The inlet pipe from the boiler to the central heating system
must not pass above the top back casing cover PD (Image 10), otherwise the
removal of the turbulators and cleaning of flue gas tubes is impossible. Before
connecting boiler to central heating system, the system has to be flushed to remove
impurities remaining after system installation. It prevents boiler overheating, noise
within the system, disturbances at a pump and mixing valve. Boiler should always
be connected to central heating system by connectors, never by welding. Image 1.
shows minimum distances required for boiler cleaning and maintenance.
5.1. CONNECTION TO THE OPEN CENTRAL HEATING SYSTEM
If the boiler is aimed to be integrated into an open central heating system, one of
possible way how to connect the boiler to the system is shown on Scheme 1. In case
of Bio-Tec boilers, the boiler pump obligatory has to be connected to the boiler control
unit, in order to make turning on and off of the pump dependant on the temperature of
the water in the boiler. The functioning of boiler regulation is shown in Technical
manual ''Digital boiler regulation Bio-Tec''.
Connection to an open central heating system requires the implementation of an
open expanding vessel (OPC) above the level of the highest radiator. If the expansion
vessel is situated inside the non heated room, it has to be insulated. The volume of
the open expansion vessel is about 7% of the volume of entire installation. The boiler
has to be connected through one or more CAS water accumulators, depending on its
power. It is recommended to connect 50 liters water accumulation to each 1 kW boiler
power (i.e. for the 45 kW boiler minimal water accumulation should be 2250 liters).
The boiler should not be used without being connected to the water accumulation
device. It must be connected to the CAS water accumulator exclusively through an 3-
way thermic valve ESBE VTC 512 (maintains minimum temperature of return water
into the boiler above 60°C), VTC 531 (maintains minimum temperature of return
water into the boiler above 60°C), LTC 141 (maintains minimum temperature of return
water into the boiler above 60°C) or Laddomat 21 (maintains minimum temperature
of return water into the boiler above 63°C)
Fuel supply method
Image 8. Fuel supply method
LEGEND:
-
-
-
DR
LT
RV
Wood log
Upper boiler chamber
Frame of upper boiler door
At filling the chamber with fuel (split logs) pay attention not to put fuel (split logs) on
the frame of top boiler door (detail 1). Fuel (split logs) has to be put so that it can be
gradually and freely move downward during burning, as shown in detail 2.
NOTE:
Detail 1
Detail 2
Image 9. Protective gloves
Protective gloves are obligatory!

11
22
GV
SV
DV
-
-
-
GV
SV
DV
Open Close
Left Right
Technical manual Bio-Tec Technical manual Bio-Tec
Connection to the open central heating system
Connection to the closed central heating system
5.2. CONNECTION TO THE CLOSED CENTRAL HEATING SYSTEM
build in certified safety valve with opening pressure of 2,5 bar, minimum seat
diameter of 15 mm, minimum inlet connection of 1/2", minimum exit connection of
3/4" and a membrane expansion vessel. Safety valve and expansion vessel must
be built in accordance with professional rules and any valve must not be located
between safety valve and expansion vessel and boiler. The closed heating system
must have the installed expansion vessel of larger volume (vessel volume must be
approx. 10% of the installation volume). In all boiler types the heating pump must
be connected to boiler regulation so that the heating pump switching on and off
would depend on water temperature in the boiler.
In closed heating system (as in example shown in Scheme 2) it is obligatory to
regulation is shown in Technical manual ''Digital boiler regulation Bio-Tec''.
The functioning of boiler
- After the regulation starts to display the lack of fuel , the fuel should be
refilled (if it is necessary to continue the heating process)-BEFORE REFILLING,
press START button ones.
FUEL REFILLING PHASE:
- open the upper boiler door (see Image 7)
- align glow with poker
- insert fuel (recommended to fill the full upper combustion chamber) (see Image 8)
- close the upper boiler door (see Image 7)
-press button START for second time. (see Point 7.0)
NOTE:
- During the process of refilling the fuel the main switch of the boiler has to be
turned on. When the firing proces is over we can turn off the main switch, but first
it is necessary, after the indication ''FUEL'' is turned on, to wait that the boiler
cool down under 65°C and the glow disappear in combustion chamber (see point
7.0.).
Boiler start up
Upper boiler door
Middle boiler door
Lower boiler door
Image 7. - Door opening method
PROCESS THE OPENING OF
BOILER DOOR:
- Upper boiler door - allowed to open only in ignition phase, fuel charging phase
and the phase of cleaning of boiler and boiler parts.
Of durig the opening door is necessary ajar, that leave them for few second so that
the fan intake smoke trough bypass, and then fully open.
- Middle boiler door - allowed to open only in ignition phase and the phase of
cleaning of boiler and boiler parts.
- Lower boiler door - allowed to open only in the phase of cleaning of boiler and
boiler parts.
LEGEND:
1
2
5
3
7T T
T T
10
11
9
8
6
4
Scheme 1. - Open central heating system with 1 water accumulator
1 - Boiler Bio-Tec
2 - "CAS" water accumulator
3 - 3-way thermic valve (maintains minimum temperature
of return water into the boiler above 60°C), VTC 531
(maintains minimum temperature of return water into
the boiler above 60°C), LTC 141 (maintains minimum
temperature of return water into the boiler above 60°C)
or Laddomat 21 (maintains minimum temperature
of return water into the boiler above 63°C)
4 - Manual 3-way mixing valve
5 - Room thermostat (included into basic delivery)
6 - Heating circuit
7 - Open expansion vessel OPC (enough above
the level of the highest radiator, approx. 7% of the
total volume of installation)
8 - Sanitary water accumulator
(SKB-Digi/LKB-Digi/TB/STEB)
9 - Pump 1 - boiler pump
10 - Pump 2 - heating pump
11 - Pump 3 - hot sanitary water pump
" "
above the
highest heating
body

- pieces of the lower refractory stone have to be situated into the deposits on the
lower wall of the combustion chamber (DS-page 3).
- turbulators (TU-page 29) have to be fixed inside the flue exhaust tubes
(DC-page 3).
- air damper (PZ-page 3) for secondary and primary air.
- flue gas tube is good fixed, tight and thermically insulated.
- if the boiler is connected to the electric power net.
- if movable elements-two lids of bottom openings of the flue gas chamber DO and
flue gas tube cleaning lever.
Remove all objects like documents/manuals eventually laying inside the boiler.
Firing has to be performed according to the instructions described in this manual
(See points 6.0 to 6.4) and Technical manual ‘’Digital boiler regulation Bio-Tec’’.
If you are sure that energy from boiler will be consumed, made firing up for one filling
of the firebox.
IGNITION PHASE AND FIRST FUEL CHARGING:
- Open upper boiler door (and close bottom if they open) (see Image 7)
- Put fine chopped wood to the upper chamber, on refractory stone (chamotte) over
the burner nozzle so that the nozzle is not obstructed, then put crumpled paper
for ignition and fill the top chamber with fuel (split logs). (see Image 7, Image 8)
- Close upper boiler door. (see image 7)
- Turn the MAIN SWITCH on. (see Point 7.0)
- Push the button START (the LED diode flutters). (see Point 7.0)
- Open the middle door and ignite paper. (see Image 7)
- Couple minutes after fine chopped wood starts burning, close the middle door.
(see Image 7)
- Push the button START (the LED diode lights). (see Point 7.0)
- (Only for Bio-Tec 25) place the button RP (see page 3) into position " "
- (Only for Bio-Tec 25) leave the button RP (see page 3) in position " " at least 1
hour or longest to the next charge with wood and then restore it in the left position.
The above actions are for ignition of the boiler from cold state (without glow).
These measures should be implemented always when we don’t have, or don’t
have enough glow, and when we will load the wood.
Technical manual Bio-Tec Technical manual Bio-Tec
Connection to the closed central heating system
The boiler has to be connected to the one or more CAS water accumulators,
depending of its power. It is recommended to connect 50 liters water accumulation
to each 1 kW boiler power (i.e. for the 45 kW boiler minimal water accumulation
should be 2250 liters). The boiler should not be used without being connected to the
water accumulator. It can be connected to the CAS water accumulator exclusively
through an 3-way thermic valve ESBE VTC 512 (maintains minimum temperature
of return water into the boiler above 60°C), VTC 531 (maintains minimum
temperature of return water into the boiler above 60°C), LTC 100 (maintains
minimum temperature of return water into the boiler above 60°C) or Laddomat 21
(maintains minimum temperature of return water into the boiler above 63°C).
12 21
Boiler start up
2
2
5
3
T T
11
9
8
7
bar
12
T T
10
6
4
1
13
Scheme 2. - Closed central heating system with 2 water accumulators
1 - Boiler Bio-Tec
2 - "CAS" water accumulator
3 - 3-way thermic valve ESBE VTC 512 (maintains
minimum temperature of return water into the boiler
above 60°C), VTC 531 (maintains minimum
temperature of return water into the boiler above 60°C),
LTC 141 (maintains minimum temperature of return
water into the boiler above 60°C) or Laddomat 21
(maintains minimum temperature of return water into
the boiler above 63°C)
4 - Manual 3-way mixing valve
5 - Room thermostat (included into basic delivery)
6 - Heating circuit
7 - Expansion vessel for closed systems
(approx. 10% of the total volume of installation)
8 - Sanitary water accumulator
(SKB-Digi/LKB-Digi/TB/STEB)
9 - Pump 1-boiler pump
10 - Pump 2-heating pump
11 - Pump 3-hot sanitary water pump
12 - Thermal safety valve
13 - Safety-airvent unit
" "

13
20
Boiler must not be used in flammable and explosive environment. It must not be
used by children or disabled persons (either physically or 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. Protective gloves must be used (Image 9). Fuel with max. 25%
moisture content may be used.
Before starting up it is necessary to check following:
- if the boiler is connected to the central heating system throught one or more water
accumulator/s, through the appropriate pump/s and 3-way thermic valve like
ESBE VTC 512 (maintains minimum temperature of return water into the boiler
above 60°C), VTC 531 (maintains minimum temperature of return water into the
boiler above 60°C), LTC 141 (keep minimal temerature of return water into the
boiler above 60°C) or Laddomat 21 (maintains minimum temperature of return
water into the boiler above 63°C) according to this manual.
- if the fresh air access to the boiler room is available (Point 4.0).
- if the boiler and the whole system are properly filled with water and airvented.
- if the safety elements are properly connected and are functioning perfectly:
- closed central heating systems should have safety valve of max. 2,5 bar, thermal
safety valve and expansion vessel of min. volume which is not less then 10% of the
total water quantity in the system.
- open central heating systems should have an open expansion vessel of min.
volume which is not less then 7% of the total water quantity in the system situated
enough over the level of the highest radiator in the system and insulated, if it is
mounted outside of heated space.
- if the mobile elements of the boiler are properly positioned:
- sheet metal protecting cover (ZL-page 3) have to be fixed to the carriers in the
upper combustion chamber.
2
2
5
3
T T
11
9
8
7
bar
12
T T
10
4
2
6
1
13
Technical manual Bio-Tec Technical manual Bio-Tec
Connection to the closed central heating system
Scheme 2.1. - Closed central heating system with 3 or more water accumulators
1 - Boiler Bio-Tec
2 - "CAS" water accumulator
3 - 3-way thermic valve ESBE VTC 512, (maintains
minimum temperature of return water into the boiler
above 60°C), VTC 531 (maintains minimum temperature
of return water into the boiler above 60°C), LTC 141
(maintains minimum temperature of return water into
the boiler above 60°C) or Laddomat 21 (maintains
minimum temperature of return water into the boiler
above 63°C)
4 - Manual 3-way mixing valve
5 - Room thermostat (included into basic delivery)
6 - Heating circuit
7 - Expansion vessel for closed systems
(approx. 10% of the total volume of installation)
8 - Sanitary water accumulator
(SKB-Digi/LKB-Digi/TB/STEB)
9 - Pump 1 - boiler pump
10 - Pump 2 - heating pump
11 - Pump 3 - hot sanitary water pump
12 - Thermal safety valve
13 - Safety-airvent unit
" "
N L N L N N L1L2L3
W W W 1 2 3 4 5 6 7 8 9 10 111213141516
01 02 03 04 05
P1P2P3
1 2 345
max. 216 W
01-05 - Sensors
01 - Boiler sensor
02 - Flue gases sensor
03 - First accumul.-upper sensor
04 - Sanitary water tank sensor
05 - Last accumul.-lower sensor
Supply
230V Fan
Relay output
Scheme 4. - Electrical connection of a ordinal terminal on the boiler
ordinal terminal ordinal terminal
Room thermostat
Room thermostat
9.0. BOILER START UP
Electric connection, boiler start up

14 19
Technical manual Bio-Tec Technical manual Bio-Tec
Boiler thermal protection
5.2.1. BOILER THERMAL PROTECTION
According to European EN standards, boiler thermal protection must be installed in
closed heating system. Boiler is factory prepared for installation of thermal
protection. Heat exchanger is built into boiler at factory, and thermal safety valve 7
should be installed according to scheme 3. In case of any damage of boiler installed
in the closed heating system due to its overheating, and boiler or system are not
equipped with any thermal protection at all, or do not have properly installed thermal
protection, guarantee will not be applied.
IMPORTANT:
Thermal protection must be connected to the water supply installation of the
premises supplied from the water supply line and not from hydrophor. Namely, in
case of failure of power supply, boiler could be overheated, and then hydrophor is
not able to ensure required water supply.
THERMAL FUSE:
INSTALLATION (under Scheme 3.)
- "
"
"
"
"
"
Thermal protection for boiler Bio-Tec consists of a heat exchanger which is factory
built in boiler, and thermal valve 7 (such as CALEFFI 543 513) (see Scheme 3.).
Part 7 is installed into prepared connector (male thread 3/4") in the upper part of
left lateral side of the boiler casing.
screw the thermal safety valve sensor 6 (outer thread1/2 ) into the sleeve joint 2
(inner thread1/2 ).
- fix the connection 4 (inner thread 3/4 ) of the thermal safety valve to the sanitary
cold water inlet and the connection 5 (inner thread 3/4 ) through the reduction to
the connection point of the heat exchanger 1 (outer thread1/2 ) - the arrow shows
the direction.
- fix the tube connected to the sewage outlet at the connecting point 3 (outer
thread1/2 ).
Boiler regulation
By pressing two buttons simultaneously you can see different values:
Button ''P'' and buttons ''+'' or ''-'': display of measured values:
01 -
02 -
03 -
04 -
05 -
06 -
07 -
Measured boiler temperature.
Measured sanitary water temperature.
Measured room temperature.
Setup room temperature (reading from the room thermostat).
Measured upper temp. in the first accumulator tank (outlet).
Measured lower temp. in the last accumulator tank.
Measured flue gases temp. (display scale 5°C).
Detailed description of the digital regulation with single buttons or indications (LED
diods) is displayed in the Technical manual "Digital boiler regulation Bio-Tec".
Button ''P'' and button ''GLOW'': setup parameter values:
1 - Setup temperature sanitary water. Adjusting range 20-70°C.
2 - Sanitary water pump steering mode. 0=parallel functioning, 1=priority
sanitary water.
3 - Parameter which determines if sanitary hot water heater and sensor
are in configuration. 0=no hot water heater, 1= sanitary hot water
heater connected.
Other parameters are factory set and can not be changed.
Button ''P'' and main switch (0/1): back to the preset regulator mode.
Button ''GLOW'' and main switch (0/1): test relay regulator mode.
8.0. ELECTRIC CONNECTION
All electrical works must be performed by a certified professional in accordance
with valid national and European standards.
A device for switching of all power supply poles must be installed in electrical
installation in accordance with the national regulations on electrical installations.
Detailed description of connecting the sensors and operation of digital regulation is
displayed in the Technical manual "Digital boiler regulation Bio-Tec".

15
18
2
3
1
6
4
5
3
2
1
bar
7
Technical manual Bio-Tec Technical manual Bio-Tec
Thermal safety valve, steering of the boiler
Scheme 3. - Thermal protection in an closed heating system
1 - Heat exchanger connection
2 - Connecting point for the thermal safety
valve sensor
3 - Heat exchanger connection
4 - Thermal safety valve connection
(cold water inlet HV)
5 - Connecting point of the thermal safety valve
(to the boiler)
6 - Thermal safety valve-sensor
7 - Thermal safety valve
Safety air
vent group
Inlet
Heat
exchanger
(factory
built in)
Sewage
outlet
Filling/Draining
Outlet
6.0. STEERING OF THE BOILER
The boiler is steered by means of the electronic regulator (digital boiler regulation),
which is built into the boiler on its upper side and has an steering and protecting
function. The functions of the boiler regulations are described in the Point 7.0 and in
Tecnical manual "Digital boiler regulation Bio-Tec".
210 11 12 13 14 15
3
4 1
5678 9
Boiler regulation
7.0. BOILER REGULATION
- Main switch (power supply switch) has the function to turn on / off the
regulator.
- LED display shows the measured temperatures, their ordinary number,
number or parameter value as well as the regulator functioning mode signal.
- Indication "START" (LED diode) shows the regulator functioning mode
(ignition/operation).
- "START"-button.
- "P"-button.
- "+"-button.
- "-/STOP"-button.
- "GLOW"-button.
- Indication "GLOW" (LED diode). Indicates the active functioning of the burning
process with glow keeping. This burning process mode can be turned on/off by
pushing the button 8.
- Indication "FUEL" (LED diode) indicates that after the period of the boiler
warming up has run out, the flue gases temperature is under the setup level for
burning with or without glow keeping. It is not recommended to open the boiler's
door while the indication ''FUEL'' is NOT on.
- Indication "FAN" (LED diode) indicates that the fan is turned on/off.
- Indication "ERROR" (LED diode) indicates that the error appeared during the
boiler functioning.
- Indication "PUMP 1" (LED diode) indicates that the relay for the P1 supply is
turned on/off.
- Indication "PUMP 2" (LED diode) indicates that the relay for the P2 supply is
turned on/off.
- Indication "PUMP 3" (LED diode) indicates that the sanitary water pump is turned
on/off.
4
1
5
6
7
8
9
2
10
11
12
13
14
15
3

16 17
Technical manual Bio-Tec Technical manual Bio-Tec
Ignition phase, boiler operation phase
6.1. IGNITION PHASE
After first boiler charging with fuel (see - Ignition phase and first fuel charging - page
21), it is necessary to push "START" button which runs fan and indication (LED) 3
is flashing. (see Point 7.0)
6.2. BOILER OPERATION PHASE
After ignition and closing of middle door by (second) pressing "START" button, the
process of boiler heating up and combustion will start (indicator (LED) 3 is switched
on continuously). In this mode the control of the flue gas temperature is fulfilled.
After the period of the heating up (120 minutes), the temperature of flue gases has
to be higher then 85°C during the normal functioning or 115°C in the mode "GLOW".
The period of heating up starts from 0 minutes with each deactivation of the fan. The
protection system deactivates the fan when the maximal temperature of one of
elements in the system has been reached.
Parallel with the flue gases temperature, increases the boiler temperature. When
the boiler temperature reaches 65°C+2°C the pump P1 is activated (see Points 5.1.
and 5.2.). The fan keeps running until the boiler's temperature comes to the 90°C. It
will be newly activated when conditions are fulfilled.
When the flue gases temperature starts to fall, because of the lack of fuel despite
the functioning of the fan, the flue gases temperature falls to 85°C, the firing process
is completed without keeping the glow, or until 115°C with keeping the glow. The fan
stops and the pump P1 keeps functioning for the next 5 minutes. The firing process
shall also be deactivated if any error appears for longer then 5 seconds.
The digital boiler regulation steers the heating pump P2 (see points 5.1. and 5.2.)
when the condition if fulfilled, i.e. the temperature inside the first water accumulator
is minimum 5°C higher then actual room temperature. Steering of the pump P2
does not depend of the firing process status inside the boiler. Description of the fan
functioning and the pumps is shown in the Technical manual "Digital boiler
regulation Bio-Tec".
After the boiler regulation starts to display the lack of fuel , it is possible to restart
the procedure of the filling the combustion chamber.
First is need to push "START" button, indication (LED) 3 is flashing (see Point 7.0),
open te upper boiler door and fill upper combustion chamber with wood logs. After
that is necessary to close upper boiler door, push "START" button, indication (LED)
3 is flashing. (see Point 7.0). If there is no glow any more, and we still wish to
continue with firing proces, we repeat the procedure from point 6.1. and 6.2. above.
B i o - T e c
Turning off digital regulation, thermal protection, safety protection
6.3. TURNING OFF DIGITAL REGULATION
If it is necessary to turn off the digital regulation (control of heating pumps, sanitary
water and the pump between the boiler and water accumulation tanks), after the
control indicator-no fuel switches on , wait until the boiler is cooled down below
65°C and until there is no wood logs in the upper chamber. Only then the main
switch on the boiler digital regulation may be turned off (see point 7.0).
6.4. THERMAL PROTECTION OF THE BOILER (CLOSED SYSTEM)
If by chance the boiler temperature reaches the temperature of 95°C, even though
the boiler regulation elements, the thermal safety valve shall allow that the water
from the aqueduct comes through the thermal valve into the boiler heat exchanger
and to cool the boiler down (see point 5.2.1.).
If the boiler is installed in the closed central heating system, a thermal valve must be
built to the designed location on the boiler. Thermal valve must be connected to the
aqueduct and, if this is not possible, the boiler has to be built in the open heating
system.
6.5. SAFETY PROTECTION IN CASE OF EXCEED TEMPERATURE
remove the safety thermostat lid at the control unit and push the button on the
safety thermostat (Image 6.).
If the boiler regulation does not disactivate the fan at 90°C of the boiler water
temperature and the level of 101 °C - 110 °C can be reached, safety thermostat will
deactivate the fan. For newly start up of the boiler following process has to be
performed:
- wait until the boiler temperature falls under 70°C:
-
- continue with boiler functioning according the "Boiler Steering Procedure" or let
the boiler be disconnected.
If the safety thermostat breaks off repeatedly, the authorized person should check
the system.
Safety thermostat
Boiler regulation unit Boiler control box
Image 6. - Safety thermostat