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: +385 40 372 600, fax: +385 40 372 611

HEATING TECHNIQUE

www.centrometal.hr

e-mail: [email protected]

Centrometal d.o.o. Glavna 12, 40306 Macinec, Croatia

maloprodaja tel: +385 40 372 640

centrala tel: +385 40 372 600, fax: +385 40 372 611

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.)

Notes

TECHNICAL DATA

(A1)

(B1)

(C1)

Bio-Tec 45

(mm) recommendation: 500x70x50

max. 550x100x100

(A)

(B)

(C)

Bio-Tec 25

12-25

105

170

100

0,022

0,754

3,5

wooden logs

12-20

235x250

890x600x250

134

1290

595

1285

1290

595

1345

420

450

150

765

1085

430

685

600

110

180

0,025

1,083

wooden logs

12-20

175

235x400

1130x600x400

272

1290

725

1525

1290

725

1580

570

610

180

1250

1320

540

685

600

140

(kW)

(Pa)

(lit.)

(°C)

(kg/s)

(kW)

(mbar)

(h)

(kW)

(%)

(l)

(mm)

(l)

(lit./kW)

(W)

(°/bar)

(V~)

(Hz)

(mm)

(kg)

(bar)

(°C)

(mm)

(R)

(mm)

by EN 305-5 point 4.2.5

250

10-15°C, 2 bar

230

515

2,5

5,5

6/4"

1/2"

3/8"

1/2"

685

600

underpressure

Bio-Tec 35

180

wooden logs

12-20

144

235x400

940x600x400

226

1290

725

1330

1290

725

1385

150

1040

1130

540

130

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)

Technical manual Bio-Tec

Dimensions

of the boiler

body

Boiler

dimensions

with casing

Lenght

Width

Height

Total lenght

Total width

Total height

GS CC

TV 60

C2 C3

C=C1

PL DM

GS CC

GO KV

DN DN

VT VP

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)

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:

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

VT VP

Screw

DN DN

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

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

min. 1000 mm

min. 500 mm

*min. 1000 mm

min. 1500 mm

min. 700 mm

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).

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 !!

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 - 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

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

100

110

5 10 15

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

Lmax

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

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:

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!

This manual suits for next models

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