Dru G30 User manual

Installation manual
Maestro 75 RCH
Maestro 75 Tall RCH
G20/G25/G25.3 (Natural gas), G30 (Butane) and G31 (Propane)
English
Store this document in a safe place
959.080.06.ENDRU-940512-EN-US-0720-1

Installation manual
2
1. Step-by-step installation plan 4
2. Introduction 5
3. CE declaration 5
4. Technical data 6
5. SAFETY 7
5.1 General 7
5.2 Regulations 7
5.3 Safety instructions 7
6. Preparation 8
6.1 Unpacking 8
6.2 Type of gas 8
6.2.1 Gas type conversion 8
6.3 Gas connection 8
6.3.1 Gas hose for gas connection 9
6.4 Electric connection 9
6.5 Components appliance control 10
7 Installation 11
7.1 Placing the appliance 11
7.2 Additional installation options of the construction frame 13
7.3 Concentric system 15
7.3.1 General 15
7.3.2 Roof terminal (C31) 17
7.3.3 Wall terminal (C11) 20
7.3.4 Connection to an existing chimney 23
7.4 Placing the chimney breast 23
7.5 Placing the control hatch 26
8 Toestel 28
8.1 Glass panes 28
8.1.1.1 Opening the glass pane 28
8.1.1.2 Removing the glass pane (Maestro 75 RCH) 28
8.1.1.2 Removing the glass pane (Maestro 75 Tall RCH) 28
8.1.2 Placing the glass pane 30
8.2 Setting the appliance 31
8.2.1 Restrictor slide 31
5.13.2 Air inlet guide 32
8.3 Placing the wood set 33
8.3.1 Wood set 33
9. Control/operation 43
9.1 Principle of ignition cycle 44
9.2 Connecting the switch contact 44
9.3 Connection extra power supply (max. 80W, 230VAC) 45
9.4 Remote controls 45
9.4.1 Black remote control for the user 45
9.4.2 Orange remote control for the installer 45
Content

Installation manual
3
9.5 Alternative operation 45
9.5.1 Wired 46
9.5.2 Wireless 47
9.5.2.1 Connection via ‘modbus’ protocol 47
9.5.2.2 Control via application 47
10. Final inspection 48
10.1 Gas tightness 48
10.2 Gas pressure/line-pressure 48
10.3 Ignition main burner 48
10.3.1 First ignition of the appliance after installation or adjustments 48
10.3.2 Procedure for igniting the main burner 49
10.4 Flame picture 49
11. Delivery 50
12. Maintenance 51
12.1 Parts 51
Appendix 1: Malfunctions 52

1. Step-by-step installation plan
The major steps of the installation are described below,
Perform these steps and tick them once they have been performed correctly.
3Carefully read the installation manual before installing the appliance.
Installation manual
4
The appliance is now (after the above-mentioned steps) ready for use and the consumer is familiar with the possibilities
for using the appliance.
Check that the gas type and gas pressure is correct on the location where the appliance is placed.
Check that the supplied parts are present (see table 6-1).
Check the appliance for damages.
Make sure that the total installation complies with the applicable national, local and architectural regulations.
Make sure that there is a gas tap present that is always accessible and meets the legal regulations.
Ensure that the placement meets the applicable requirements concerning fire safety.
Make sure that the configuration of the concentric system with roof or wall duct corresponds with the imposed
requirements (see section 7.3).
Make sure the chimney breast meets the fire safety requirements. (see section 7.4).
Make sure the chimney breast meets the minimum dimensions (see section 7.4).
Make sure the chimney breast is sufficiently ventilated (see section 7.4).
Make sure that the control hatch with gas control is placed correctly (see section 7.5).
Make sure that the restrictor slide and air inlet guides are correctly adjusted (see section 8.2).
Ensure a correctly placed wood, pebble set or broken glass set with accessories (see section 8.3).
Make sure the remote control is made ready for use (see section 9.4).
Check all gas connections for gas tightness (see section 10.1).
Make sure that the appliance is first ignited without the glass pane (see section 10.3.1).
Ensure a cleaned glass pane in accordance with the instruction, before the atmospheric fire is ignited with the glass
pane for the first time (see chapter 12).
Check the appliance with installed glass pane for a correct ignition and a correct flame transfer of the main
burner(s) when igniting for the first time (see section 10/3/2).
Familiarise the user with the appliance (see chapter 11).
Check that the correct type of appliance has been delivered (see table 4-1).

2. Introduction
DRU, a manufacturer of gas-fired heating appliances, develops and produces products that comply with the highest
possible quality, performance and safety requirements. This appliance has a CE label, which means that it complies with
the essential requirements of the European Gas Appliance Directive. The appliance is supplied with an installation
manual and a user manual. Installation and maintenance of the appliance should be performed by a professional certified
expert with a proven knowledge and demonstrable competence in this field.
A professional expert takes all technical aspects such as heat output, gas connection and electricity into account, as well
as the flue gas discharge requirements. The information in this installation manual will ensure the appliance is installed in
such a way that it will function properly and safely. If the installation instruction is not clear, national/local regulations
must be observed.
This manual discusses the installation of the appliance and the regulations that apply to the installation. In addition, the
appliance's technical data are shown and information is provided about maintenance, possible malfunctions that might
occur and their possible causes.
Fully and carefully read and use this installation manual, before installing the appliance. When using the DRU Powervent
system® or DRU CM system®, the accompanying installation manual should also be read completely and carefully, before
installation work begins.
The following symbols are used in the manual to indicate important information:
1Work to be performed
2Suggestions and recommendations
3You will need these instructions to prevent problems that might occur during installation and/or use.
3You need these instructions to prevent fire, personal injury or other serious damages.
After final delivery, the manuals should be handed over to the user.
3. CE declaration
DRU declares that company internal measures guarantee that appliances produced by DRU meet the essential
requirements and guidelines of the regulation concerning gas-fired appliances and the accompanying standards. This
declaration loses its validity if changes are made to the appliance without written permission from DRU. The instructions
in the manuals must also be observed at all times. A copy of the CE test certificate can be downloaded via
www.druservice.com.
Product:
Type:
Product identification number:
Conformity assessment body:
Regulations:
Directives:
Standards:
Gas-fired heating appliance
Maestro 75 RCH, Maestro 75 Tall RCH
0063CQ3299
Kiwa Netherlands B.V. (0063)
Wilmersdorf 50
Postbus 137
7300 AC, Apeldoorn
(EU) 2016/426, (EU) 2015/1188
2014/35/EU, 2014/30/EU
EN 613:2000, EN 613:2000/A1:2003, EN 613:2000/PrA2:2002
EN 60335-1:2012, EN 60335-2-102:2016, EN 55014-1:2007
EN 55014-2:2015, EN 61000-3-2:2014, EN 61000-3-3:2013
Installation manual
5
DRU Verwarming B.V.
Postbus 1021, NL-6920 BA Duiven
Ratio 8, NL-6921 RW Duiven
www.drufire.com
R.P. Zantinge, Managing director
Duiven, 20/07/2020

4. Technical data
Check the technical data based on the table below.
Installation manual
Gastype:
Indirect heating functionality
Direct heat output
Indirect heat output
Space heating emissions NOx
Heat output
Nominal heat output
Minimum heat output (indicative)
Technical data
Nominal heat input (Hs)
Nominal heat input (Hi)
Consumption max
Consumption min
Burner pressure max
Burner pressure min
Main burner injector
Low setting injector
Efficiency class (EN613)
Useful efficiency (NCV)**
Useful efficiency at nominal heat output
Useful efficiency at minimum heat output
(indicative)
Auxiliary electricity consumption
At nominal heat output
At nominal heat output
In standby mode
Permanent pilot flame power requirement
Pilot flame power requirement (if applicable)
Energy efficiency
Energy efficiency index
Energy efficiency class
Symbol
Pnom
Pmin
ηth,nom
ηth,min
elmax
elmin
elSB
Ppilot
EEI
G25/G25.3*
Nee
8,6 / 8.7
-
110,4 / 76,4
8,6 / 8,7
1,2 / 1,5
11,4 / 11,4
10,3 / 10,3
1223 / 1235
209 / 211
18,7 / 18,7
4,7 / 4,7
2x Ø1,65
1x Ø1,55
R****
1
91,3 / 91,9
87,0 / 90,7
0,0236
0,0125
0,0026
-
91 / 91.4
A / A
G31
Nee
7,4 / 8,2
-
111,8 / 85,6
7,4 / 8,2
1,3 / 1,5
10,3 / 10,7
9,5 / 9,9
385 / 395
79 / 79
27,2 / 27,1
10,3 / 10,3
2x Ø1,05
1x Ø1,00
R****
1
90,5 / 90,7
83,7 / 88,9
0,0236
0,0125
0,0026
-
90 / 90.2
A / A
G20
Nee
9,0 / 9,2
-
126,7 / 80,4
9,0 / 9,2
1,3 / 1,7
12,0 / 12,0
10,8 / 10,8
1140 / 1144
218 / 218
14,7 / 14,7
4,7 / 4,8
2x Ø1,65
1x Ø1,55
R****
1
89,0 / 91,6
84,2 / 92,4
0,0236
0,0125
0,0026
-
89 / 91.1
A / A
Unit
kW
kW
mg/kWhinput
(GCV)
kW
kW
kW
kW
L/h
L/h
mbar
mbar
mm
mm
%
%
kW
kW
kW
kW
G30
Nee
8,9 / 9,5
-
- / 95,5
8,9 / 9,5
1,6 / 1,8
12,0 / 12,2
11,1 / 11,3
340 / 344
69 / 68
27,1 / 26,8
10,0 / 10,0
2x Ø1,05
1x Ø1,00
R****
1
91,1 / 91,7
85,2 / 89,0
0,0236
0,0125
0,0026
-
90 / 91.2
A / A
Type of heat output / room temperature control
Single stage heat output, no room temperature control
Two or more manual stages, no room temperature control
With mechanic thermostat room temperature control
With electronic room temperature control
With electronic room temperature control plus day timer
With electronic room temperature control plus week timer
Other control options
Room temperature control, with presence detection
Room temperature control, with open window detection
With distance controle option
No
No
No
Yes
Yes
Yes
Yes***
Yes***
Yes
Maestro 75 RCH / Maestro 75 Tall RCH
Built-in
Closed combustion
C11, C31, C91, C12, C32*****
I2E, I2E+, I2EK, I2ELL, I2H, II2H3+, II2E+3+, II2H3B/P, II2E3B/P, II2EK3B/P
200/130
DRU LAS ES-I 200/130, DRU LAS ES-E 200/150/100,
DRU LAS ES-I 150/100, DRU PV-I 100/60
Separated ignition / ionization plugs
Yes
???
???
200 cm2
* This appliance is suitable for G25.3 with the composition according NTA 8837. ** System efficiency. *** To be used by means of
home automation. **** Adjusting screw. *****Categories C12 and C32 only in combination with DRU PV-1 100/60 (PowerVent®).
Typeaanduiding(en)
Soort toestel
Verbranding
Type
Categorie
Toestelaansluiting concentrisch systeem
Toepasbare concentrische systemen
Uitvoering vlambeveiliging
Atmosfeerbeveiliging
Drukvereffeningsluik
Ventilatieopening boezem
Table 4-1: Technical data
6

5. SAFETY
5.1 General
3- Observe the generally applicable regulations and precautions/safety instructions in this manual.
- First check that the technical execution of the appliance to be installed is correct (see table 4-1).
- Read this manual carefully to ensure the proper and safe installation of the appliance.
- Observe the regulations/instructions in this manual.
5.2 Regulations
Please install the appliance in accordance with the applicable national, local and constructional (installation) regulations.
5.3 Safety instructions
Carefully observe the following precautions/safety instructions:
3The appliance may only be installed and maintained by recognised installers who are skilled in the field of gas heating
and electricity.
3Do not make any changes to the appliance.
3When installing a built-in appliance:
- Use non-combustible and heat-resistant materials for the chimney breast, including the top of the chimney breast and
the material in the chimney breast, such as the floor under the appliance and the back wall against which the appliance
will be placed. For this you can use both sheet material and stone-like materials.
- Take sufficient measures to prevent temperatures of a wall behind the chimney breast becoming too high, including
the materials and/or objects behind the wall.
- Take the minimum required internal dimensions of the chimney breast into account. These are for the benefit of safety
and for the prevention of excess heat accumulation in the chimney breast.
- Vent the chimney breast by means of the ventilation holes (see table 4-1). These are essential for ensuring safety and
for the prevention of excess heat accumulation in the chimney breast.
- Use heat resistant electrical connectors.
- Place heat-resistant electrical wiring away from the appliance and as low as possible in the chimney breast. This has to
do with the temperature development in the chimney breast.
- Only use the flue gas discharge / combustion air supply system (concentric system) supplied by DRU.
3When installing a free-standing appliance: place the appliance at the indicated minimum distance from the back wall, as
indicated further down in the text.
3Do not cover the appliance and/or do not wrap it in an insulation blanket or any other material.
3Keep combustible objects and/or materials outside the appliance's radiation range (see table 4-1).
3Only use the accompanying set, such as the wood or pebble set, and place it exactly as described.
3Leave space around the ionisation pin and spark electrode and never place glow material around these pins.
3Make sure there is no dirt in gas pipes and connections.
3Place a gas tap in accordance with applicable regulations.
3Check the complete installation for gas tightness prior to commissioning.
3Prevent the explosion hatch(es) on the top of the appliance (if present) from getting clogged and check that they
properly fit on the sealing surface, before the appliance is built in.
3Do not ignite the appliance until it is fully installed when it comes to the gas connections, discharge system and electrical
components.
3Do not use the appliance when a pane is broken and/or cracked, until it has been replaced.
3The appliance was designed for atmospheric and heating purposes. This means that all visible surfaces, including the
glass pane, can become hotter than 100C°. It is recommended to always place a protective grating in front of the
appliance when there are children, elderly people or handicapped persons in the same room as the appliance.
If it is possible that vulnerable people are regularly present in the room with no supervision, a fixed guard should be
mounted around the appliance.
Installation manual
7

6. Preparation
6.1 Unpacking
Note the following items when removing the packaging:
1Remove all packaging materials.
1Remove all supplied components in, on and/or at the appliance.
1Check the appliance and accessories for damages (during transport).
1If necessary, contact your supplier.
1Never install an appliance that is damaged!
1Remove any screws that are used to fix the appliance to a platform or pallet.
3The glass pane(s) is/are made of a ceramic material. Very small irregularities in the glass panes cannot be avoided, but are
within the required quality standards.
3Keep plastic bags away from children.
Table 6-1 indicates which components should be available after removing the packaging.
1Contact the supplier if you find that not all components have been supplied.
1Packaging must be disposed of in accordance with the regulations.
Installation manual
8
6.2 Type of gas
The data plate indicates for which type of gas, gas pressure and for which country this appliance is intended.
The data plate can be found on the appliance or can be attached to a chain to which it should remain attached.
3Check whether the appliance is suitable for the type of gas and the gas pressure used at the location.
6.2.1 Gas type conversion
In order to convert this appliance to a different type of gas, please contact DRU's service department and ask for
the possibilities. The conversion should be performed by a recognised gas installer.
6.3 Gas connection
Place a gas tap in the gas pipe in accordance with the applicable regulations. The gas connection on the gas control is
located next to the receiver (fig. 6-2 (Gin)).
3- Make sure there is no dirt in the gas pipes and connections.
- No soldering may take place at the flexible gas hose(s), as this could cause leaks.
The following requirements apply to the gas connection:
- Use a gas pipe with the correct dimensions, so that no pressure loss can occur.
- The gas tap must be approved (in the EU this will be the CE mark).
- You should always be able to reach the gas tap.
Table 6-1: Parts included with the delivery
Part
Installation manual
User manual
Wood set
Glow material
Ash
Restrictor slide
Remote control
Mains lead
Control hatch
Back-up self-tapping screws for benefit of glass pane assembly
Key bolts M8
Hexagonal nut M8
Washer M8
Compression fitting 15 mm x G3/8"
Socket spanner 8 mm
Amount
1x
1x
1x
1x
1x
1x
1x
1x
1x
nx
4x
4x
4x
1x
1x

Installation manual
9
6.3.1 Gas hose for gas connection
In many cases, an EN14800-compliant gas hose for a gas connection can be ordered together with the appliance. The gas
hose is mounted to the appliance and has been checked for leak-tightness. This gas hose is available in different lengths.
3Take the following into account when installing the gas connection and the appliance (see fig. 6-1):
- The gas connection must always be accessible to be able to shut off the gas supply.
- The gas connection may only be mounted vertically, so that the gas hose can be connected vertically at the bottom.
- The gas connection is permitted in a zone (blue hatched area in fig. 6-1). To the left and right of the appliance to a
height of 30 cm above the bottom side of the appliance (the bottom side is the end of the adjustable feet holder,
without the feet). Under the appliance in the area between the legs.
- The gas connection and gas hose should not be placed behind the appliance.
- The gas hose may not get above the bottom side of the appliance (the bottom side is the end of the foot without the
adjustable feet)
- The minimum bend radius of the hose is 40 mm.
- The hose should be placed as low as possible, must have a minimum distance from the appliance of 20 mm and, if
possible, should not be placed under the burner.
- The entrance of the gas control in which the hose is mounted faces the appliance. Due to the bend radius, the chimney
breast width becomes larger on the side of the control hatch. The minimal depth of the control hatch is 270 mm.
6.4 Electric connection
In case of an electrical connection of 230 Volts, always provide sufficient earthing. Place this electrical connection away
from the appliance, as low as possible in the chimney breast. Make sure the electrical connection is within reach. This has
to do with the temperature development in the chimney breast.
3Make sure that it is easy to disconnect the appliance from the power supply after installation: By disconnecting the
plug or by means of a 2-core switch installed by a recognised installer in accordance with current regulations.
3- Protect the gas control and electric components, hereafter referred to as the gas control, against building dust and
moisture!
- In the case of appliances made with the CM system®, observe the instructions in the supplied manual for connecting
the receiver and control panel.
≥ Ø 40 mm
≥ 20 mm
300 mm
6-1

Installation manual
10
6.5 Components appliance control
This section states the components that are used to control the appliance (see fig. 6-2).
Legend:
A = Gas control; controls the gas to the burners
B = Receiver; communicates with the transmitter
C = Processor (ESYS); controls the gas control
D = Distribution block; connection of the burners
E = Valve 2nd burner; opens and closes the gas supply to the 2nd burner (if applicable)
P1 = Pressure gauge nipple 1; line-pressure
P2 = Pressure gauge nipple 2; burner pressure
G (IN) = Gas connection; connection from the gas control to the gas network
D
A
C
B
G(in)
E
P2
P1
6-2

Installation manual
11
7 Installation
7.1 Placing the appliance
Separate sub-sections describe different ways of placing the appliance. The general description below for placing the
appliance applies to all these sub-sections:
1Place the appliance where it will be installed and observe the following:
3- The construction dimensions of the appliance (see fig. 7-1 and 7-2).
- The minimum chimney breast dimensions (see section 7-4).
- The length of the cables and pipes (see section 7-4).
- Place the appliance in front of a heat-resistant and non combustible wall and on a heat-resistant and non-flammable
floor. The wall brackets on a built-in appliance ensure that the minimum distance to the wall is maintained (see fig. 7-1
and 7-2 (B)).
- Take sufficient measures to prevent temperatures of a possible wall behind the chimney breast becoming too high,
including the materials and/or objects behind the wall.
- Make sure there are no combustible objects or materials within the radiation range (see fig. 7-12) of the fire.
- Place the concentric system in such a way that no fire hazard can ever be created (see section 7.3).
- Do not cover the appliance and/or do not wrap it in an insulation blanket or any other material.
- Make sure that the appliance to be installed has a stable position. Fasten possible extending legs with the self-tapping
screws.
1Set the height of the appliance using the adjustable feet and level the appliance.
1Attach the appliance to the wall using wall brackets (see fig. 7-1 and 7-2 (B)).
1Loosen the bracket with the gas control by loosening the self-tapping screws and screw the self-tapping screws back in
the appliance.
1Place the bracket with the gas control, together with the wiring of the ignition/ionization cable(s), the flexible gas hose(s)
and the data plate with chain in the direction of the control hatch (see section 7.5).
3- Do not lay the cables of the ionisation and ignition pins along metal parts, wiring and other components.
- The data plate must remain attached to the appliance with the chain.
min 1130
max 1180
50
660
750
130
200
814
981
BB
30
697
min 110
max 160
38C-2161/1
Maestro 75 RCH
7-1

Installation manual
12
50
min 1769
max 1819
1300
750
130
200
981
814
BB
min 110
max 160
1337
30
400
182
38C-2716/0
Maestro 75 Tall RCH
7-2

Installation manual
13
7.2 Additional installation options of the construction frame
The construction frame of this appliance can be adjusted from the “4S version” to the “3S version” (see fig. 7-3). The 3S
version allows you to fit the glass pane against the floor or platform.
3When using the 3S construction frame, the platform or floor in front of and next to the appliance has to be made with
inflammable material (see section 7.4)
3No other information can be provided, nor can responsibility be accepted for the way in which floor covering or other
materials are influenced by the use of this appliance (e.g. the ‘working’ of a wooden floor). This despite adhering to the
minimum required distance to non combustible floor covering or other materials.
When choosing the 3S version, the lower strip of the construction frame has to be removed before this appliance is
installed.
Proceed as follows (see fig. 7-3):
1Remove the Allen screws with an Allen key.
1Hold the strip and unscrew the self-tapping screw.
1Remove the strip.
3S
4S
38C-2698
7-3

Installation manual
14

Installation manual
15
7.3 Concentric system
7.3.1 General
The appliance is connected to a flue gas discharge / combustion air supply system delivered by DRU, hereafter referred to
as the concentric system. DRU has different concentric systems in its range.
In the case of a concentric system, the inner tube is used as flue gas discharge. The combustion air is supplied by the
outer tube. As a result, the latter always has a relatively low temperature. For the maximum temperature of the outer
tube, see the technical data in table 4-1. The concentric system has been tested in combination with the appliance. Other
concentric systems are not permitted.
See the table below for the different concentric systems of DRU and their application:
System
DRU LAS AG-I 150/100
DRU LAS ES-I 150/100
DRU LAS ES-I 200/130
DRU LAS ES-E 200/150/100
DRU PV-I 100/60
Toegelaten
voor dit
toestel.
Nee
Ja
Ja
Ja
Ja
Remarks
Alu-galva tubes for use inside the building*.
Diameter Ø150/100 mm.
Cannot be combined with the SS systems.
SS tubes for use inside the building*.
Diameter Ø150/100 mm.
Using an SS adapter, it is possible to construct further with the
insulated LAS ES-E 200/150/100 system.
SS tubes for use inside the building*.
Diameter Ø 200/130.
Using an SS adapter, if permitted, it is possible to construct further with
LAS-ES-I 150/100.
Insulated SS tubes.
Discharge diameter Ø150/100.
External diameter Ø 200 mm.
Intended for use inside or outside building for placement in, for example,
timber frame construction, execute with 0 mm distance along combustible
material etc. It is not possible to continue building with an SS adapter with
LAS ES-I 150/100.
Optional discharge system with fan for discharge up to approx. 60 metres
long.
* With the exception of the components intended for that purpose, such as roof and wall terminals.
The diameter of the concentric system appliance connection can be found in table 4-1. By means of natural draft, the flue
gases are discharged to the outside, this can be achieved by means of a wall terminal (C11) or a roof terminal (C31). If
necessary, an existing chimney can be used (C91, see section 7.3.5).
In addition, if combined with PowerVent© (C12, C32), it is possible in many cases to discharge the flue gases with a
smaller diameter (DRU PV-I 100/60).
1Only use the concentric system supplied by DRU This system has been tested in combination with the appliance. DRU
cannot guarantee a proper and safe operation of other systems and does not accept any responsibility or liability for this.
1Use a chimney kit for making a connection to the chimney; this can be supplied by DRU.
1For terminals, observe the information in table 7-2.
Table 7-1: Concentric systems and their application

Installation manual
16
System
DRU LAS AG-1 150/100
DRU LAS ES-I 150/100
DRU LAS ES-I 200/130
DRU PV-I 100/60
(also see:
installation manuel
PowerVent©)
DRU LAS ES-E 200/150/100
Ø
(mm)
≥250
≥300
≥200
≥204
Ø
(mm)
≥154
≥204
≥104
≥204
Notes
The terminal hole may be covered
with a rosette made of
non-combustible material. This
terminal hole must be ventilated.
A 2 mm wide ventilation opening
around the tube is sufficient.
The space between the tube and the
combustible material may not be
filled with insulation material.
The distance from combustible
material may be 0 mm.
The terminal hole does not require
ventilation.
If a clip binding is placed in a terminal
hole, a hole diameter of Ø230
mm must be maintained.
Note
Make terminal hole all around 2mm
larger than the diameter of the
concentric system to prevent
"ticking"and such like.
The terminal hole does not require
ventilation.
Make terminal hole all around 2mm
larger than the diameter of the
concentric system to prevent
"ticking" and such like.
The terminal hole does not require
ventilation.
If a clip binding is placed in a terminal
hole, a hole diameter of Ø230 mm
must be maintained.
3- Maintain a distance of at least 50 mm between the outside of the concentric system and the walls and/or ceiling. If the
system is built in (for instance) a cove, it should be made with non combustible, heat-resistant material all around it.
This does not apply to the insulated concentric system (DRU LAS ES-E 200/150/100).
- Some heat-resistant insulation materials contain volatile components that will spread an unpleasant smell for a
prolonged time; these are not suitable.
The concentric system is constructed from (the flue spigot of) the appliance.
If, due to constructional circumstances, the concentric system is placed first, it is possible to connect the appliance by
means of a telescopic pipe piece.
Place the concentric system as follows:
1Build the system up from (the flue spigot of) the appliance.
1Connect the concentric pipe pieces and, if necessary, the bend(s).
1Apply a clip binding with silicon sealing ring on each connection (does not apply to DRU LAS ES-E 200/150/100, here the
sealing ring is inside the tube).
1Use a sheet metal screw to fix the clip binding to the pipe on locations that cannot be reached after installation.
1Attach the concentric system with sufficient fastening brackets, so that the weight is not resting on the appliance.
Observe the following;
- Place the first fastening bracket 0.5 metre from the appliance, at the most.
- Place a fastening bracket maximum 0.1 metre from each bend, if the bends are more than 0.25 metre away from each
other. If two bends are closer to one another than 0.25 metre, 1 fastening bracket between these bends will be
sufficient.
- At least every 1 metre, place a fastening bracket at slanted and horizontal sections.
- At least every 2 metres, place a fastening bracket at vertical sections.
1Fasten a roof terminal with anchor cables, if it protrudes more than 1,5 metres above the terminal.
1Determine the remaining length for the wall or roof terminal and cut it to size, make sure the correct insertion length is
maintained.
1Place the wall terminal with the (groove/folded) seam at the top. Attach the wall terminal from the outside by means of
four screws.
Hole diameter and execution
Combustible material Non combustible material
Table 7-2: Terminals

7.3.2 Roof terminal (C31)
The roof terminal can end in a sloping and a flat roof.
The roof terminal can be supplied with an adhesive plate for a flat roof or with a universally adjustable tile for a sloping
roof.
When using a roof terminal (C31), the following applies:
The construction of the chosen system has to be allowed. The working method below indicates how the permissibility is
determined of a concentric system when using a roof terminal.
1Count the number of 45° and 90° bends required (15° and 30° bends are also allowed; these are not counted).
1Count the total number of whole metres of horizontal pipe length.
1Count the total number of metres of vertical and/or sloping pipe length (roof terminal excluded).
1Find the number of required bends and the total horizontal pipe length (see table 7-3, columns 1 and 2).
1Find the required total vertical and/or sloping pipe length (see table 7-3, row 1).
1A box with a letter means that the chosen concentric system is permitted.
1Determine the adjustment of the appliance (see table 7-4).
1Adjust the appliance correctly with, for instance, a restrictor slide and an air inlet guide (see section 8.2).
Roof terminal Maestro 75
3- In case of a roof terminal without bends: first connect 0.8 metres of concentric system vertically on the appliance with
a diameter of 200/130 mm. After the first 0.8 metres, reduce the concentric system to a 150/100 mm diameter,
including a 150/100 mm roof terminal.
- In case of a roof terminal with bends: first connect 0.8 metres of concentric system vertically on the appliance with a
diameter of 200/130 mm. Make the concentric system with a 200/130 mm diameter, and reduce the concentric system
immediately after the last bend to 150/100 mm, including 150/100 mm roof terminal.
Roof terminal Maestro 75 Tall
3- In case of a roof terminal without bends: Directly reduce the concentric system to a 150/100 mm diameter, including a
150/100 mm roof terminal.
- In case of a roof terminal with bends: Make the concentric system with a 200/130 mm diameter, and reduce the
concentric system immediately after the last bend to 150/100 mm, including 150/100 mm roof terminal.
Installation manual
17

Installation manual
18
EEEDDD
CCCBBB
EDDDCC
CBBBAA
DDCCC
BBBAAA
CCCB
BBAAAA
CBB
BAAAAA
BB
AAAAAA
A
AAAAAA
DDDCCC
BBBAAA
DCCCB
BBAAAA
CCBB
BAAAAA
BBB
AAAAAA
BA
AAAAAA
A
AAAAA
DDCCCB
BBAAAA
CCCBB
BAAAAA
CBBB
AAAAAA
BBA
AAAAAA
AA
AAAAA
A
AAAA
Table 7-3: Determination of the permissibility of a concentric system with roof terminal
G20/G25/G25.3
G30/G31
Total number of
metres horizontal
pipe length
Total number of metres vertical and/or sloping pipe length
No bends
2 bends
3 bends
4 bends
5 bends
Situation is not permissible. There are many more possibilities in combination with the DRU PowerVent system (DRU
PV-I 100/60) (see PowerVent installation manual).
Tabel 7-4: Voorwaarden voor afstellen van het toestel bij toepassing van een dakdoorvoer
G20/G25/G25.3/G30/G31
Situation
A
B
C
D
E
Air inlet guide
NEE
JA
JA
JA
JA
Restrictor slide
NEE
JA
JA
JA
JA
Restrictor slide
(Distance in mm)
OPEN
60 (B)*
45 (C)*
40 (D)*
36 (E)*

Installation manual
19

7.3.3 Wall terminal (C11)
When using a wall terminal (C11), the following applies:
The construction of the chosen system has to be allowed.
1Check that the vertical pipe length falls between the minimum and maximum lengths (see table 7-5).
1Check that the horizontal pipe length (wall terminal excluded) falls within the minimum and maximum length (see table
7-5).
2In the horizontal section, 1 bend of 90° may be included. This bend counts for 2 metres. This means that the maximum
allowed length is reduced by 2 metres. A 45° bend counts for 1 metre.
1Determine the correct adjustment of the appliance (see table 7-5).
1Adjust the appliance correctly with, for instance, a restrictor slide and an air inlet guide (see section 8.2).
The rosette of the wall terminal is too small to seal the opening in case of passage through combustible material. That is
why a heat-resistant intermediate plate of sufficient size should first be mounted to the wall. Then, the rosette is
mounted on the intermediate sheet.
3When using a wall terminal, place the terminal with a downward slope of 1 cm / metre towards the outside, in order to
prevent rain water from raining in.
Installation manual
20
0 - 6m
0.5 - 0.8m
38C-744ZQ
1x90°
0
0
38C-744W
1x90°
Tabel 7-5a Tabel 7-5b
Setting - Maestro 75
Air inlet guide
Restrictor slide
Apply
x
x
- Only use 200/130 mm concentric system, including the
200/130 mm wall terminal.
- Factory settings: Air inlet guide mounted (L1) and
installed. Restrictor slide (58mm) is supplied with the
appliance.
- Only use 200/130 mm concentric system, including the
200/130 mm wall terminal.
- Factory settings: Air inlet guide mounted (L1) and
installed. Restrictor slide (58mm) is supplied with the
appliance.
Setting - Maestro 75
Air inlet guide
Restrictor slide
Apply
x
x