Guntamatic BMK User manual

Log Boiler
BMK
Installation Instructions BMK-A-00-00-00-01-IADE
DE-B31-004-V05-0411
UK Distributor
Treco Ltd
Pyramid House
Tiverton Business Park
Tiverton, Devon EX16 6TG
www.treco.co.uk
[email protected]
0845 130 9012/ 01884 250 970

BMK Installation Instructions
2
Information on this documentation BS-B-00-00-00-01-IADE
Please read through this documentation carefully.
It is intended as a reference document and contains important
information on the design, safety, operation, maintenance and
care of your heating system.
We are always looking to improve our products and
documentation. Any ideas and suggestions you may have will
be gratefully received.
GUNTAMATIC Heiztechnik GmbH
a Georg Fischer Group Company
Bruck 7
A-4722 PEUERBACH
Tel: [phone] / 2441-0
Fax: [phone] / 3031
E-mail: [e-mail]
It is important that you pay particular
attention to the safety issues highlighted in
the text by these symbols.
The entire contents of this document are the property of
GUNTAMATIC and therefore protected by copyright.
Reproduction of any kind, communication to third parties by
any means or use for purposes other than those intended
without the written consent of the owner is prohibited.
Subject to printing errors and technical amendments.

BMK Installation Instructions
3
Contents BMK-C-00-00-00-01-IADE Page
1 Introduction..........................................................4
1.1 Safety instructions 4
1.2 Guarantee 4
1.3 Commissioning 4
1.4 Site requirements 4
1.4.1 Fire safety (minimum fire safety requirements) 5
1.4.2 Boiler room requirements 6
1.4.3 Flue requirements 7
2 Installation and assembly...................................8
2.1 Delivery 8
2.2 Carrying to installation site 8
2.3 Positioning and aligning the boiler 10
2.4 Plumbing connections 11
2.5 Filling and bleeding the system 13
2.6 Connecting the flue 14
2.7 Energy-saving flue draught regulator and pressure-
surge compensator 15
3 Electrical connections.......................................16
3.1 Electrical connections to the heating system 16
3.2 Wiring requirements 17
3.3 Electrical connections 18
4 Final checks/Commissioning ...........................20
5 Standards/Regulations......................................21
6 Plumbing diagrams...................................... 21-27
6.1 Information on integrated interlock 22
7 Electrical wiring diagrams .......................... 28-32
7.1 Control panel 28
7.2 Wall controller set MK261 29
7.3 Boiler circuit board without outside-temp. based controller 30
7.4 Boiler circuit board with outside-temp. based controller 31
7.5 External boiler interlock 32
6 Technical data....................................................35

BMK Installation Instructions
4
1 Introduction BS-01-00-00-00-01-IADE
1.1 Safety instructions BS-01-01-00-00-01-IADE
GUNTAMATIC heating systems represent state-of-the-art
technology and meet all applicable safety regulations.
Incorrect installation can endanger life and limb. Heating
boilers are combustion systems and are potentially dangerous
if handled incorrectly. Installation, commissioning and
servicing must, therefore, only be carried out by adequately
qualified technicians observing all regulations and the
manufacturer's instructions.
1.2 Guarantee and warranty BS-01-02-00-00-01-IADE
The manufacturer's guarantee is subject to correct installation
and commissioning of the heating system. Defects and
damage caused by incorrect installation, commissioning or
operation are not covered by the guarantee. To ensure that
the system functions as intended, the manufacturer's
instructions must be followed. Furthermore, only genuine
replacement parts or parts explicitly approved by the
manufacturer may be fitted to the system.
1.3 Commissioning BS-01-03-00-00-01-IADE
Commissioning of the boiler must be carried out by an
authorised GUNTAMATIC specialist or other qualified
persons. They will check whether the system has been
installed according to the plans, adjust the system settings as
required and explain to the system operator how to use the
heating system.
1.4 Site requirements SY-01-04-00-00-01-IADE
When establishing the site requirements, it is absolutely
essential to take account of the locally applicable planning,
building and implementation regulations and the dimensional
specifications in the fitting guidelines, installation examples
and technical data. Compliance with the locally applicable
regulations and the correct implementation of the measures
required on site are solely the responsibility of the system
owner and are a requirement of the manufacturer's guarantee.
GUNTAMATIC provides no guarantee of any kind for any type
of site work.

BMK Installation Instructions
5
1.4.1 Fire safety SY-01-04-01-00-01-IADE
If the installation site is not subject to any other fire safety
requirements, the GUNTAMATIC minimum fire safety
requirements must always be observed. If the installation site
is subject to stricter requirements than the minimum fire safety
requirements specified here, then the stricter requirements
must always be observed without exception.
Caution: Compliance with the GUNTAMATIC minimum fire safety
requirements is subject only to verification by the operator.
The operator alone is responsible for strict compliance.
Verification during commissioning is not provided for.
Caution: National regulations must also be complied with.
National regulations Austria: F90/T30
State legislation of the federal states
Germany: No requirements for systems up to 50 kW
Standard boiler regulations (M-FeuVO)
Hessen and Saarland –in these states §16 FeuVO Hessen
applies
Switzerland:
Fire safety regulations (www.vkf.ch)
France:
Relevant fire safety authority
Italy:
Relevant fire safety authority
Minimum fire safety requirements BS-01-04-01-01-01-IADE
SY-01-04-01-02-01-IADE
Boiler room Floor of concrete construction, either bare or tiled. All
materials for floor, walls and ceiling must be fire-resistant to
F60 rating. The boiler room door must be a Class T30 fire
door which opens in the direction of escape and is self-
closing. Connecting doors to the fuel storeroom must also be
Class T30 fire doors, self-closing and lockable. There must be
no direct connection to rooms in which flammable gases or
liquids are stored (e.g. garage).

BMK Installation Instructions
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1.4.2 Boiler room requirements BS-01-04-02-00-01-IADE
SY-01-04-02-01-01-IADE
Combustion air supply The pressure in the boiler room must not be less than 3 Pa
(0.3 mm H2O). The air vents for boiler rooms must have a
clear, net cross-sectional area of at least 400 cm² and must
not be sealable. The air supply ducting must connect directly
to the outside and if the ducting passes through other rooms,
it must be jacketed to Class F90. On the outside of the
building, air vents must be covered by a protective grille with a
mesh size of > 5 mm. The supply of combustion air should, if
possible, enter at floor level in order to prevent cooling of the
boiler room.
SY-01-04-02-02-01-IADE
Electrical installation The lighting and the electrical wiring in the boiler room must
be permanently installed.
BS-01-04-02-03-01-IADE
Fire extinguisher A hand-held fire extinguisher (6kg gross weight, EN3) must be
mounted outside the boiler room near the boiler-room door.
BS-01-04-02-04-01-IADE
Protection against freezing The boiler room, pipes carrying water and any district heating
pipes must be protected against freezing.
BMK-01-04-02-05-01-IADE
Minimum room size BMK 20- 50 at least 199 x 148 cm (W x L) (w/o igniter)
at least 209 x 148 cm (W x L) (with igniter)
BMK-01-04-02-06-01-IADE
Minimum room height BMK 20 - 30 at least 145 cm (space for removing helix baffles)
BMK 40 - 50 at least 185 cm (space for removing helix baffles)
BMK-01-04-02-07-01-IADE
Clear access opening BMK 20 - 30 at least 80 x 140 cm (W x H) (w/o packing)
BMK 40 - 50 at least 80 x 160 cm (W x H) (w/o packing)
Boiler dimensions BMK-01-04-02-08-01-IADE
With packing BMK 20 - 30 at least 97.3 x 94 x 144 cm (L x W x H)
BMK 40 - 50 at least 97.3 x 94 x 164 cm (L x W x H)
Without packing BMK 20 - 30 at least 96.5 x 79.5 x 135 cm (L x W x H)
BMK 40 - 50 at least 96.5 x 79,5 x 153 cm (L x W x H)

BMK Installation Instructions
7
1.4.3 Flue requirements BS-01-04-03-00-01-IADE
The flue must be matched to the system in order to ensure
economical and trouble-free operation.
SY-01-04-03-01-01-IADE
Important
BS-01-04-03-02-01-IADE
The system must only be connected to the flue if the flue
meets the legal requirements and the technical specifications.
The flue must be matched to the boiler output and
dimensioned in accordance with DIN 4705. In order to be able
to accurately dimension the flue, the calculations must be
based on the flue gas figures. When designing new flues, high
thermal insulation chimneys (DIN 18160 T1 heat transmission
resistance group I) or suitable fireclay flues that are
insusceptible to damp and have general building regulation
approval should be used. It is advisable to involve those
responsible for approving the flue system early on in the
planning phase.
BS-01-04-03-03-01-IADE
Flue height The minimum flue height is 5 - 10 m depending on boiler
output. The flue must terminate at least 0.5 m above the
highest part of the building. In the case of flat rooves, the flue
must terminate at least 1.5 m above the surface of the roof.
BMK-01-04-03-04-01-IADE
Flue diameter The flue must be matched to the boiler output. The following
details are guide figures and can be used for planning
purposes. However, we recommend that the flue dimensions
are calculated precisely by an expert.
BMK 20/30 eff. flue height over 6 m D=180 mm
eff. flue height under 6 m D=200 mm
BMK 40/50 eff. flue height over 6 m D=180 mm
eff. flue height under 6 m D=200 mm
BMK-01-04-03-05-01-IADE
Flue dimensioning data Dimension the flue for rated output.!
(Averaged figures with used heat exchanger)
Rated output
Sub-maximum output
Type
Flue gas
temp.
CO2
Mass flow rate
Required
draught
BMK 20/30
200 - 220°C
13 -14%
0.020 kg/s
20 pascals
BMK 40/50
200 - 230°C
13 -14%
0.034 kg/s
20 pascals
Type
Flue gas
temp.
CO2
Mass flow rate
Required
draught
BMK 20/30
170 –200°C
10 -12 %
0.011 kg/s
20 pascals
BMK 40/50
170 –200°C
10 -12 %
0.013 kg/s
20 pascals
Use heat-insulated fireclay flues that are
insensitive to damp.
GUNTAMATIC accepts no liability
where stainless steel flues are used.

BMK Installation Instructions
8
2 Installation and assembly BS-02-00-00-00-01-IADE
2.1 Delivery BS-02-01-00-00-01-IADE
The boiler system is delivered packed in a wooden crate
wrapped in foil. Please check that the delivery is complete
according to the delivery note and in perfect condition.
Deficiencies Please make a note of the deficiencies identified directly on
the delivery note and contact the supplier, heating installer or
our Customer Service.
2.2 Carrying to installation site BS-02-02-00-00-01-IADE
The system is delivered on a wooden pallet and can be lifted
and carried to the installation site using a pallet truck.
Carrying in dismantled The boiler body can be dismantled into parts for carrying in. If
that is done, a person authorised by GUNTAMATIC must be
consulted.
BMK-02-02-00-01-01-IADE
To be able to undo the heat exchanger unions, all
of the insulation must be removed from the boiler.
Take care not to damage the gaskets (B) when
lifting off the heat exchanger.
Important: damaged gaskets must always be
replaced without exception.
Pull in carrying straps and position lower section
(A) in boiler room; place gasket strips (B)
precisely in position all the way round; place
gasket cord (C) precisely in position on upper
section
Bring upper section (D) into boiler room using
carrying strap or 1" tubes and set down on lower
section. Gasket strips (B) and gasket cord (C)
must not slip out of position! Fit washers and
connect up heat exchanger applying tightening
torque of no more than 30 Nm.
1
D
B
B
B
B
C
O

BMK Installation Instructions
9
Fitting servo motor BMK-02-02-00-02-01-IADE
Switch power switch to "OFF";
There is a coloured mark on the motor mounting
plate;
There is also slot with a coloured mark on the air
baffle shaft;
Place the servo motor in front of you with the orange
side facing upwards; now press the black button on
the servo motor and rotate the motor shaft
anticlockwise until it reaches the stop;
Now turn the coloured mark on the air baffle shaft so
that it lines up with the coloured mark on the motor
mounting plate;
Slot the servo motor onto the air baffle;
Check: → Boiler viewed from the right
Air flaps in closed position (see diagram on left);
electrical connections as per wiring diagram

BMK Installation Instructions
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2.3 Positioning and aligning the system BMK-02-03-00-00-01-IADE
Keep to the minimum wall clearances specified by the system
planner and manufacturer. If important details are missing,
please refer to the planning documentation or ask our
Technical Support. Position the system as close as possible to
the flue to avoid having a long flue connecting pipe. The
system must be accessible from the left or right side.
Clearance on left at least 20 cm
Clearance on right at least 30 cm (clear space for servicing servo motor)
Clearance at front at least 70 cm (clear space for opening boiler doors)
Clearance at rear at least 35 cm (from boiler rear panel –w/o auto igniter)
at least 45 cm (from boiler rear panel –with auto igniter)
Floor clearance Set the clearance between the boiler base and the floor to the
required minimum of 30 mm by unscrewing the adjustable feet
on the boiler base.
Set the boiler at a slant Unscrew the rear adjustable feet slightly further so that the
boiler is slightly higher at the rear. That will allow the air
inside the boiler to escape easily when the system is filled.

BMK Installation Instructions
11
2.4 Plumbing connections BMK-02-04-00-00-01-IADE
BMK 20-50
A→Heating flow, 1" → (Reserve)
B→STL/Boiler sensor
C→ Heating flow, 1¼"
D→ Connection, 1/2" → (for external use)
E→Heating return, 1" → (Reserve)
F→ Drain, 1/2"
G→Automatic igniter
H→ Heating return, 1¼"
I→Temperature sensor, 1/2"
J→ Temp. relief valve, 95°C
K→ Cold water supply for
temp. relief heat exchanger
SY-02-04-00-01-01-IADE
Temperature-relief heat exchanger A temperature-relief valve to ÖNORM B 8131 and DIN 4751
with an opening temperature of 95°C must be provided on site
and connected to the temperature-relief heat exchanger. The
supply pressure must be at least 2 bar but no more than 6 bar.
The temperature-relief valve must be connected to the cold
water mains supply by a connection that cannot be turned off.
The outlet of the discharge pipe must be routed and installed
in such a way that functional capacity cannot be impaired and
no danger can arise when the temperature-relief valve
responds. The instructions for the temperature-relief valve
must be followed.
SY-02-04-00-02-01-IADE
Thermal store Installation of an adequately dimensioned thermal store is
absolutely imperative. No guarantee liability is accepted for
systems with a thermal store capacity under 1,000 litres (=
1,000 litres excluding DHW capacity in the case off
combination cylinders).
Min. thermal store capacity 1,000 litres
Recommended thermal store capacity Over 1,400 litres
Ideal thermal store capacity 2,000 - 3,000 litres
Caution →Make sure any regulations regarding thermal store size are
observed.
In system with a pure thermal store capacity under 1,400
litres (= 1,400 litres excluding DHW capacity in the case of
combination cylinders) the boiler must be fuelled according to
required output, i.e. it should only be loaded with as much
wood as can be coped with by the system and the thermal
store in the hours that follow.

BMK Installation Instructions
12
SY-02-04-00-01-03-IADE
Return boost The boiler return temperature must be at least 55°C and must
be held at the required level by a return boost set. Return-
temperature regulators in the bypass are not allowed. If this
requirement is not complied with, there is an increased risk of
corrosion and guarantee entitlement will be lost as a result.
Connect the return boost set precisely as specified in our
plumbing diagrams.
Important →If additional components such as heat meters are
incorporated in the system plumbing, or if the overall thermal
store pipe run (flow and return) is more than 30 m, re-
dimensioning of the boiler charging pump (BCP) may be
necessary.
SY-02-04-00-04-01-IADE
Expansion vessel The boiler operates in a sealed heating system and must be
provided with an expansion vessel for pressure compensation.
To calculate the expansion volume, the volume of the system
when cold must be known. Please select the expansion vessel
on the basis of the manufacturer's specifications. The
expansion volume of the system is calculated as follows:
System volume x Expansion factor x Additional allowance
factor
Expansion factor for wood-fuel boilers = 0.03
Additional allowance factor = 3.0 for systems under 30 kW
Additional allowance factor = 2.0 for 30-150 kW systems
Additional allowance factor = 1.5 for systems over 150 kW
Example calculation: 2500 litres x 0.03 x 3 = 225 litres
BS-02-04-00-05-01-IADE
Plastic piping If plastic piping for underfloor heating or district heating pipes
are connected, they must be protected against excessive
temperatures by using a limiting thermostat for the circulation
pumps.
BS-02-04-00-06-01-IADE
Pump selection The choice of pump must be made by the installer or building
technology planner on the basis of the friction data, the pipe
cross-sectional area and the required delivery pressure for the
piping system planned.

BMK Installation Instructions
13
2.5 Filling and bleeding the system BS-02-05-00-00-01-IADE
The system is filled with water from the domestic supply.
Please note the guidelines on "Corrosion and boiler protection
in heating and domestic water systems".
Water quality The water quality of hot water systems with flow temperatures
of max. 100°C is subject to VDI 2035. According to VDI 2035
Part 1, "Avoiding damage to hot water systems", which
comply with EN12828, the first-fill and replenishment water,
must be conditioned (preferably softened) if the following
overall hardness limits [°dH] according to total heat output
(kW) are exceeded:
< 50kW: with circulating flow heaters, if °dH > 16.8
50 to 200 kW: if °dH > 11.2
200 to 500 kW: if °dH > 8.4
> 500kW: if °dH > 0.11
Water heater If a water heater is also used in addition to the GUNTAMATIC
boiler, it should be filled according to the installation
instructions for it.
Filling the system
Match the pressure of the system when cold to the air
charge pressure of the expansion vessel
Check the operating pressure on the pressure gauge
Bleeding the system
Switch off and bleed circulation pumps.
Bleed boiler by opening the bleed valve on the boiler
and allowing air to escape until water runs out.
Bleed radiator heating system (if present) by opening
the bleed valve on every radiator and allowing air to
escape until water runs out.
Bleed underfloor heating system (if present) by opening
each heating circuit and flushing through thoroughly
until there are no more air bubbles in the heating circuit
pipes.
Important: perform sequence in the correct order!
Start bleeding in the cellar or on the ground floor and
finish in the attic.
Check the system operating pressure on the pressure
gauge and add more water if necessary.
Restart circulation pumps.
Only systems that have been properly bled
guarantee effective conveyance of heat.

BMK Installation Instructions
14
2.6 Connecting the flue BS-02-06-00-00-01-IADE
BMK-02-06-00-01-01-IADE
The boiler is connected to the flue by means of a flue
connecting pipe which must be gas-tight and insulated
between the heating boiler and the chimney (insulation
thickness 50 mm).
Flue connecting pipe The following diameters should be used:
BC 20 - 50 dia. = 150 mm
Flue connecting pipes longer than 4 m or with more than 3
bends:
BC 20 - 50 dia. = 180 mm
The hole in the wall for connecting the flue pipe must be lined
with a built-in double-skinned lining tube or fireproof material.
The flue connecting pipe must rise upwards from the boiler to
the flue at an angle of at least 6° and be connected with gas-
tight joints. An inspection cover must be provided for cleaning
the flue connecting pipe.
BMK-02-06-00-02-01-IADE
A→Testing point for flue draught
B→Flue draught regulator/pressure-surge
compensator in flue
(Preferred fitting arrangement)
C→Flue connecting pipe, min. gradient 6°
D→Alternatively: Flue draught regulator in flue
connecting pipe
(As close as possible to junction with the flue)
BS-02-06-00-03-01-IADE
Note
The flue connecting pipe must be gas-tight
An energy-saving flue draught regulator with pressure-
surge compensator (Class RE) must be fitted
Insulate the flue connecting pipe
Do not brick in the flue connecting pipe (noise
transmission)
The flue connecting pipe must not extend into the flue

BMK Installation Instructions
15
2.7 Energy-saving flue draught regulator and pressure-surge compensatorBMK-02-07-00-00-01-IADE
Purpose
To ventilate the flue when the system is not in
operation
To compensate for pressure surges
To regulate and limit the flue draught
Fitting requirement The energy-saving flue draught regulator must be fitted in
accordance with the local regulations, preferably in the flue
approx. 0.5 m below the point where the flue connecting pipe
joins or alternatively in the flue connecting pipe close to its
junction with the flue.
Flue draught setting:
Adjusting the flue draught is only of any use at outside
temperatures below +5°C.
The system must have been in operation for at least an
hour
Ensure there is sufficient demand for heat for the boiler
to be run at rated output for at least 15 minutes
Measure the flue draught between the boiler and the
flue draught regulator (distance of measuring point from
boiler ideally 3 x flue diameter from connection
between boiler and flue connecting pipe).
Flue draught The flue draught should not differ by more than +/- 3 pascals
from the figure specified in the flue dimensioning data. If the
flue draught cannot be reduced to the required figure, either a
larger draught regulator should be fitted or an additional flue
baffle fitted between the flue and the draught regulator.
Too much flue draught May cause the flue gas temperature to increase and
accelerate combustion as a result. Poor boiler output
adjustability, increased dust discharge and malfunctions can
result.
Too little flue draught Performance problems, incomplete combustion and
malfunctions when operating below rated output can result.
Fitting an energy-saving flue draught
regulator/pressure-surge compensator (Class
RE) is absolutely imperative (200 mm dia.
wherever possible)

BMK Installation Instructions
16
3 Electrical connections BS-03-00-00-00-01-IADE
3.1 Heating system electrical connections BMK-03-01-00-00-01-IADE
Mains connection
230V, 50Hz, 13A fuse
Power surge conductor (lightning conductor recommended)
Standard specifications
1 Boiler control panel (BCE)
1 Boiler circuit board (230V AC)
1 Safety temperature limiter (STL)
1 Boiler sensor (KVT20 Ω)
1 Flue gas temperature sensor (thermocouple)
1 Oxygen sensor (12V DC)
1 Flue draught fan (230V AC)
1 Ignition fan (230V AC –optional)
1 Primary/secondary air vent motor (24V DC)
1 TKS 1 (right casing door switch, 24V DC)
1 Boiler charging pump output KLP (230V AC)
1 Special output HP0 (230V AC)
4 Pump outputs (230V AC)
Optional equipment
4 Pump outputs (230V AC)
2 Mixer valve outputs (230V AC)
1 Outside temperature sensor input (KVT20 Ω)
1 DHW cylinder sensor input (KVT20 Ω)
2 Flow temperature sensor inputs (KVT20 Ω)
3 Analogue inputs for room stats (RFF25)
KVT20 resistances
Temperature
in °C
KVT20 in kΩ
-20 °C
1.383
-16 °C
1.434
-8 °C
1.537
-4 °C
1.590
0 °C
1.644
10 °C
1.783
20 °C
1.928
30 °C
2.078
40 °C
2.234
50 °C
2.395
60 °C
2.563
70 °C
2.735
80 °C
2.914

BMK Installation Instructions
17
RS (HKR 0)
CAN - Bus
HKR 0 230VAC
H
RG 2
SH - L H
CAN - BCE
+SH -L +
CAN - Bus
RG 0
RG 1 H
CAN - BCE
SH L
-+
(Taurus)
KP
SY-BUSSERVICE
BCE
Display
ETHERN. SD-CARD CAN CAN
CAN - Bus
3.2 Wiring requirements BS-03-02-00-00-01-IADE
Surge protection Where CAN bus cables run between different buildings, the
earthing conductors of the buildings must be connected to
each other for potential equalisation purposes. If the earthing
conductors cannot be interconnected, a 10 mm rustless ring
earth must be laid along with the CAN bus cable in the
ground. The earthing conductors and ring earth must then be
connected to one another.
Sensor 2 x 1 mm²
Analogue room stat RFF 2 x 1 mm²
CAN bus connecting cable 2 x 2 x 0.5 mm² twisted pair, shielded
More outside-temp. based
controllers can be connected via
CAN bus
Key: BCE →Control panel
KP →Boiler PCB
HKR →Heating circuit controller
RG →Analogue room stat
RS →Digital room controller
Wiring CAN bus in line Whenever possible, always wire the CAN bus "in line", i.e.
from the display and control unit to heating circuit controller 0
then from there to heating circuit controller 1, and so on. If
wired in a star pattern, the overall length of the CAN bus must
not exceed 100 metres. Wire the CAN bus +/- and H/L
connections with twisted-pair cable in each case.

BMK Installation Instructions
18
3.3 Electrical connections BS-03-03-00-00-01-IADE
The electrical connections to the boiler system on site may
only be made by an approved electrical installer observing all
the applicable regulations. In addition, it is essential that
electrical system components are protected against damage
from heat radiation.
All boiler system internal wiring is wired up at the factory ready
for use. The work required on site by the electrical installer
consists only of connecting the mains power and wiring up
and connecting the system components such as thermal
store, CAN bus, heating circuit pumps, mixer valve motors,
etc.
BS-03-03-00-01-01-IADE
Mains power supply 230 V, 50 Hz, 13 A fuse
The mains power must be connected by means of the
standard non-reversible power socket on the rear panel of the
boiler. It must possible to isolate the system entirely from the
mains without opening the switch panel cover, e.g. by means
of an automatic circuit-breaker.
Correct polarity of the boiler's mains power connection
must be ensured. The live (L) and neutral (N) phases must
not be reversed as otherwise the short-circuit protection
and safety system function cannot be guaranteed.
BMK-03-03-00-02-01-IADE
Opening switch panel Before the switch panel is opened, the boiler mains lead must
be unplugged from the power supply. The system must not be
live.
Undo the securing screw on the back of the black
controller cover;
Lift the controller cover slightly at the back and slide it
upwards to remove it;
The circuit board with the associated connectors and
fuses (see electrical wiring diagram) is located
underneath it in an easily accessible position.
When connecting the cable, the cable duct provided at
the back must be used
BS-03-03-00-03-01-IADE
Outside-temperature based controller The MKR outside-temperature based heating circuit controller
set is offered as an option and activated on the boiler circuit
board if required. The MK261 wall controller set, on the other
hand, can only be fitted externally and connected to the
system via the CAN bus. Operation and configuration is via
the boiler control panel.
Set MKR The heating circuit controller can be used to control a DHW
cylinder, a pumped heating circuit (HC0) and two mixed
heating circuits (HC1, HC2).

BMK Installation Instructions
19
Wall controller set MK261 The wall controller set MK261 must be connected to the
(external) power supply at terminal H35 and connected to the
control panel via the CAN bus.
The wall controller can be used to control a DHW cylinder, a
pumped heating circuit and 2 mixer-valve heating circuits.
Pay special attention to the section "Wiring requirements,
Wiring CAN bus in line".
Analogue room stat The room stat should be connected to the relevant heating
circuit controller input at terminals 1 and 2 (see electrical
wiring diagram).
Digital room controller The room controller must be connected to the boiler (control
panel) or wall controller set MK261 via CAN bus.
BS-03-03-00-05-01-IADE
Surge protection We recommend the installation of a power surge protector in
the building's consumer unit.
Pay special attention to the section "Wiring requirements,
Surge protection".
Earthing The entire system is to be joined to the earth circuit conductor
via the connected piping system according to the regulations.
When connecting the earth circuit conductor pay
particular attention to keeping the connecting runs as
short as possible.
Emergency power supply Only use regulated generators.

BMK Installation Instructions
20
4 Final checks/Commissioning BS-04-00-00-00-01-IADE
Final checks
After completing installation of the system, check
again that all joints and pipes are properly tightened
and not leaking.
Check that all covers are fitted and secured.
Check that the fitting of all connections (water, flue,
electrical, ...) has been done correctly.
Check that all required safety signs and instructions
are attached and hand over all documentation
(operating and installation instructions) for the system.
Check that all electrical connections have been
properly wired before connecting the system to the
power supply.
Clean the system and clear up the installation site.
Always leave the boiler room clean.
Initial commissioning Commissioning must only be carried out by GUNTAMATIC or
a qualified specialist. The precondition is that the flue
technician, heating installer and electrician have cleared the
system for operation. The authorised GUNTAMATIC specialist
will carry out the following work during commissioning:
Check the entire system
Check the electrical functions
Adjust the programmer to the system
Commission the system
Explain to the user how the system functions and how
to operate and clean it
Record the details of the customer and the system
and complete the commissioning log
Important →Any deficiencies identified must be recorded in writing and
rectified within the following 4 weeks in order to maintain
guarantee entitlement.
The fully completed commissioning checklist must be
sent to GUNTAMATIC immediately as otherwise the
guarantee will be void.
Important →These installation instructions should not be destroyed after
commissioning but kept permanently with the system together
with the operating instructions.