Dru Maestro 60 RCH User manual

Installation manual
Maestro 60 RCH
Maestro 60 Tall RCH
G20/G25/G25.3 (Natural gas), G30 (Butane) and G31 (Propane)
English
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959.130.02.ENDRU-986471-EN-US-1022-2
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Installation manual
2
1. Step-by-step installation plan 4
2. Introduction 5
3. EU/UKCA Declaration of conformity 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 outlet 9
6.4 Electrical connection 9
6.5 Components of the appliance control unit 10
7. Installation 11
7.1 Placing the appliance 11
7.2 Additional installation options of the construction frame 14
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 (C91)) 23
7.4 Placing the chimney breast 23
7.5 Placing the control hatch 26
8. Appliance 28
8.1 Glass panes 28
8.1.1 Opening the glass pane 28
8.1.2 Closing the glass pane 29
8.1.3 Removing glass pane 30
8.1.4 Reinstalling glass pane 31
8.2 Adjusting the appliance 32
8.2.1 Restrictor slide 32
8.2.2 Air inlet guide 33
8.3 Wood set 34
8.3.1 Installing the wood set 34
9. Control/operation 41
9.1 Igniting the appliance 42
9.2 Connection switch contact (Eco Glow) 43
9.3 Switching/Dimmable power supply (Triac) 43
9.4 Operation 43
9.4.1 Remote control 43
9.4.2 DRU Fire App - User 43
Content

Installation manual
3
9.4.3 DRU Fire App – Service 43
9.5 Wired home automation system 44
10. Final inspection 46
10.1 Gas tightness 46
10.2 Gas pressure/line-pressure 46
10.3 Ignition main burner 46
10.3.1 First ignition of the appliance after installation or adjustments 46
10.3.2 Igniting the burner(s) 47
10.4 Flame picture 47
11. Delivery 48
12. Maintenance 49
12.1 Parts 49
Appendix 1: Malfunctions 50

1. Step-by-step installation plan
3Read the full installation manual prior to installing the appliance.
The major points of attention of the installation are described in the check list below. Perform these steps and tick them
once they have been performed correctly. After ticking all the steps, the appliance will be ready for use.
Installation manual
4
The appliance is free from damage
All supplied parts are present (see table 6-1)
The correct gas type and gas pressure is present on the location where the appliance will be placed
The gas tap is within reach after installation and meets the legal requirements
The gas connections are gas-tight (see section 10.1)
The concentric system has been installed in accordance with the imposed requirements (see section 7.3)
The total installation complies with national and local structural requirements and fire safety requirements
The chimney breast complies with the imposed fire safety requirements (see section 7.4)
The chimney breast complies with the minimum dimensions and has been provided with sufficient ventilation
(see section 7.4)
The control hatch with the appliance control unit has been installed in accordance with the instructions
(see section 7.5)
The restrictor slide and/or air inlet guide(s) have been adjusted correctly (see section 8.2)
The log, pebble or broken glass set has been placed as described (see section 8.3)
The remote control has been prepared for use (see section 9.5)
When the appliance is ignited for the first time, the glass pane has been removed (see section 10.3.1)
The glass pane(s) has/have been cleaned before the appliance with glass pane(s) is ignited (see section 12)
When igniting for the first time with glass pane, the appliance ignites correctly and the flame progress on the
main burner is correct (see section 10.3.1)
The user has been familiarised with the appliance and its functions (see section 11)
The correct appliance has been supplied (see table 4-1)

2. Introduction
DRU, a manufacturer of gas-fired and electric stoves, develops and produces products that comply with the highest
quality, performance and safety requirements. The information in this installation manual will ensure the appliance is
installed in such a way that it will function safely and in a correct way.
Installation and maintenance of the appliance should be performed by a certified and competent professional person,
hereafter referred to as the installer. Read the installation manual prior to installing the appliance and make sure the
instructions contained therein are fully and carefully observed. If applicable, this also applies to the installation manuals
for the DRU PowerVent® and the DRU CM system.
The appliance is supplied with an installation manual and a user manual. The installation manual discusses the
installation of the appliance and the applicable instructions, includes the technical specifications of the appliance and
provides information about its maintenance and any failures that might occur and what might cause these failures. The
user manual contains all information that is relevant to the user in order to operate the appliance properly and safely.
After final delivery, both manuals should be handed over to the user.
Where installation instructions are not clear, national/local legislation should be observed.
Symbols are used in the manuals to indicate important information:
1Work to be performed
2Tips and additional information
3Necessary instructions to prevent problems that might occur during installation and/or use
3Necessary instructions to prevent fire, personal injury or other serious damages
3. EU/UKCA Declaration of conformity
This declaration of conformity is provided under the sole responsibility of DRU Verwarming, hereafter referred to as DRU.
DRU declares that company internal measures guarantee that appliances produced by DRU meet the essential
requirements and guidelines of the European 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 EU test certificate can be downloaded
via www.druservice.com.
Product:
Type:
Product identification number:
EU test certificate:
Conformity assessment body:
Regulations:
Directives:
Standards:
Gas-fired heating appliance
Maestro 60 RCH, Maestro 60 Tall RCH
0063CU3479
18GR0159/02
Kiwa Netherlands B.V. (0063)
Wilmersdorf 50
Postbus 137
7300 AC, Apeldoorn
(EU) 2016/426, (EU) 2015/1186, (EU) 2015/1188
2014/53/EU, 2014/35/EU, 2014/30/EU, 2009/125/EC
EN 613:2021, EN 60335-1:2012, EN 60335-1:2012/A2:2019,
EN 60335-1:2012/A11:2014, EN 60335-1:2012/A13:2017,
EN 60335-1:2012/A14:2019, EN 60335-2-102:2016
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, 29-08-2019

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*
No
6,8
-
96,8
6,8
1,6
9,3
8,4
1001
269
16,7
6,2
1x Ø1,65
1x Ø1,40
1x Ø1,50
A****
1
92,5
91,0
0,0236
0,0125
0,0026
-
92
A
G31
No
7,3
-
69,4
7,3
1,1
9,7
8,9
359
60
26,6
9,0
1x Ø1,10
1x Ø0,90
1x Ø1,05
A****
1
93,9
91,9
0,0236
0,0125
0,0026
-
93
A
G20
No
7,2
-
107,2
7,2
1,9
9,8
8,8
931
271
13,5
4,9
1x Ø1,65
1x Ø1,40
1x Ø1,50
A****
1
94,3
91,3
0,0236
0,0125
0,0026
-
94
A
Unit
kW
kW
mg/kWhinput
(GCV)
kW
kW
kW
kW
L/h
L/h
mbar
mbar
mm
mm
%
%
kW
kW
kW
kW
G30
No
8,5
-
80,4
8,5
1,2
11,0
10,2
311
50
26,5
8,4
1x Ø1,10
1x Ø0,90
1x Ø1,05
A****
1
94,6
91,8
0,0236
0,0125
0,0026
-
94
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 60 RCH / Maestro 60 Tall RCH
Built-in
Closed combustion
C11, C31, C91, C12, C32*****
I2E, I2E+, I2EK, I2ELL, I2H, I3B, I3P, II2E3B/P, II2EK3B/P, II2H3B/P, II2H3P
200/130
DRU LAS ES-I 200/130, DRU LAS ES-E 200/150/100,
DRU LAS AG-I 150/100, DRU LAS ES-I 150/100, DRU PV-I 100/60
Separated ignition / ionization plugs
Explosion pane
150°C
700 mm / 500 mm
V-in: 80 cm2 (Eco Glow; 2x 80 cm2) / V-out: 200 cm2
* This appliance is suitable for G25.3 with the composition according NTA 8837. ** System efficiency. ***(achieved) using home
automation. **** Adjusting screw. *****Categories C12 and C32 only in combination with DRU PV-1 100/60 (PowerVent®).
Model identifier(s)
Type of appliance
Combustion
Type
Categorie
Concentric appliance connection
Applicable concentric systems
Flame protection version
Pressure equalisation
Max. temp. outer tube concentric system
Radiation range safe distance (front/side)
Ventilation hole chimney breast
Table 4-1: Technical data
6

5. SAFETY
5.1 General
3- Observe the generally applicable regulations and precautions/safety instructions in this manual.
- Read this manual carefully to ensure the proper and safe installation of the appliance.
- Prior to starting the installation, check that the correct appliance has been delivered on the basis of table 4-1.
5.2 Regulations
Please install the appliance in accordance with the applicable national, local and constructional (installation) regulations.
5.3 Safety instructions
3Carefully observe the following precautions/safety instructions:
- Installation and maintenance of the appliance should be performed by an installer.
- The appliance was designed for atmospheric and heating purposes. This means that all visible surfaces, including the
glass pane, can become hotter than 100°C. It is recommended to always place a guard grille in front of the appliance
when children, older people or persons with reduced physical, sensory or mental capacities are in the same room as
the appliance. If these vulnerable people are regularly present in the room without supervision, a fixed guard should
be made around the appliance.
- Keep combustible objects and/or materials outside the appliance's radiation range (see section 7).
- Do not cover the appliance and/or do not wrap it in an insulation blanket or any other material.
- Do not use the appliance when a pane is broken and/or cracked, until it has been replaced.
- Only use the flue gas discharge / combustion air supply system (concentric system) supplied by DRU.
3When installing the appliance, heed the following warnings:
- Do not make any changes to the appliance.
- Only use the accompanying set, such as the wood or pebble set, and place it exactly as described.
- Leave space around the ionisation pin and spark electrode and never place glow material around these pins.
- Place a gas tap in accordance with applicable regulations.
- Make sure there is no dirt in gas pipes and connections.
- Check the complete installation for gas tightness prior to commissioning.
- Do not ignite the appliance until it is fully installed in relation to the gas connections, discharge system and electrical
components.
3When installing a built-in appliance:
- Prevent 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.
- 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 special sheet material and stone-like materials.
- Take sufficient measures to prevent excessive temperatures of a wall behind the chimney breast, 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.
- Ventilate the chimney breast by means of ventilation holes (see section 7). These are essential for 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.
3When installing a free-standing appliance:
- Place the appliance at the indicated minimum distance from the back wall and side walls (see section 7).
Installation manual
7

6. Preparation
6.1 Unpacking
When unpacking the appliance, please proceed as follows:
1Remove all packaging materials and dispose of them by means of the correct waste processing method.
3Keep plastic bags and packaging materials away from children.
1Remove all supplied components in, on and/or at the appliance.
1Remove the screws, if the appliance is attached to a platform or pallet.
1Check the appliance and accessories for damages (during transport). In case of damage, contact your supplier.
3Never install a damaged appliance.
1Use table 6-1 to check if all components have been delivered. Contact your supplier if this is not the case.
2The glass panes are made of ceramic material, which means that minor irregularities in the surface cannot be prevented.
These are within the imposed quality standards.
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
This appliance is intended for use on a gas installation with a gas pressure regulator in the supply. In addition, a gas tap
should be installed in the gas pipe, in conformity with the applicable regulations.
3- Make sure the gas pipes and connections are free from dirt.
- No soldering work may be performed at the flexible gas hose(s).
For the gas connection (fig. 6-2 (Gin)), the following requirements apply:
- Lay the gas pipe in such a way that no pressure loss can occur.
- The gas tap must be provided with the correct quality mark.
- The gas tap should be accessible at all times during and after installation.
Table 6-1: Parts included with the delivery
Part
Installation manual
User manual
Wood set (including: chips, vermiculite and ash)
Glowing Embers set (if applicable)
Glow material
Restrictor slide
Air inlet guide 2
Remote control
Mains cable
Control hatch
Back-up self-tapping screw
Key bolt M8 (including: Hexagonal nut M8 and Washer M8)
Compression fitting 15 mm x G3/8”
Socket spanner 8 mm
Number
1x
1x
1x
1x
1x
1x
1x
1x
1x
1x
nx
4x
1x
1x

Installation manual
9
6.3.1 Gas hose for gas outlet
If legally permitted, a gas hose for a gas outlet (according to EN14800) can be ordered with the appliance in various
lengths (consult DRU Service for this). The gas hose is mounted to the appliance at factory and has been checked for
leak-tightness.
3- The gas outlet should be accessible at all times during and after installation.
- The gas outlet may only be placed vertically (see fig. 6-1).
- The gas outlet and gas hose may not be placed behind the appliance.
- The gas outlet should be placed next or under the appliance on the wall behind the appliance.
- Measured from the bottom of the adjustable foot holder, a maximum allowed placement height of 30 cm shall apply
(see fig. 6-1).
- A minimum radius of 40mm must be observed in case of a bend in the gas hose (see fig. 6-1).
- A minimum distance of 20mm must be observed between gas hose and appliance.
- The gas hose must be placed as low as possible in the chimney breast. Place it as far away from the burner as possible.
- The input of the appliance control unit points towards the appliance. Due to the bend radius of the gas hose, the
chimney breast width becomes larger on the side of the control hatch.
6.4 Electrical connection
Ensure a 230 Volt earthed electrical connection. Place this connection in such a way that it is free from the appliance.
When using a chimney breast, the connection should be placed as low as possible, in connection with the temperature
development during use.
3Make sure the installation can be made free from voltage easily after installation, by disconnecting the plug or using a
2-pole switch placed by an installer in accordance with normal regulations.
3- Protect the appliance control unit and accompanying electrical components against building dust and building
moisture.
- When connecting the receiver and the control panel of the CM system, observe the instructions in the provided
installation manual.
≥ Ø40 mm
≥ 20 mm
300 mm
38C-2605/2
6-1

Installation manual
10
6.5 Components of the appliance control unit
The appliance control unit consists of the following components (see fig. 6-2):
A: Distribution block; connection of the burners
B: Main valve; controls the gas supply to the main burner and valve second burner.
C: Valve second burner; switches the gas supply to the second burner (if applicable)
D: Controller (ESYS); controls the ignition procedure and checks for a safe operation
E: Receiver (DFGT); ensures the control of the appliance
P1: Pressure gauge nipple 1; burner pressure
P2: Pressure gauge nipple 2; line-pressure
G(IN): Gas connection; connection from the gas control to the gas network
38C-2555/2
6-2

Installation manual
11
7. Installation
7.1 Placing the appliance
Separate sections describe different ways of placing the appliance. The general description below for placing the
appliance applies to all these sections:
1Place the appliance on the location where it will be installed and take the following into account:
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 heat-resistant and non combustible walls and on a heat-resistant and non combustible
floor.
- The wall brackets on a built-in appliance ensure that the minimum distance to the wall is maintained (see fig. 7-1 (B)).
- Take sufficient measures to prevent excessive temperatures of a possible wall behind the chimney breast, including the
materials and/or objects behind the wall.
- Make sure there are no combustible objects or materials within the radiation range of the appliance (see fig. 7-12).
- Place the concentric system in such a way, that it is impossible for a fire hazard to occur (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 (B) and fig. 7-2 (B)).
1Loosen the appliance control unit with transport bracket from the appliance, by loosening the self-tapping screws and
screw the self-tapping screws back in the appliance.
1Place the appliance control unit, 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- Ensure the cables of the ionization and ignition pins are lying free from metal parts as much as possible and are lying
fully free from signal and voltage cables.
- The data plate must remain attached to the appliance by means of the chain at all times.

Installation manual
12
600
600
50
937
50
130
200
650
726
AA
30
153
472
650
110
38-2554/02
Maestro 60 RCH
7-1

Installation manual
13
1137
50
800
600
50
130
200
650
726
A
A
110
850
30
472
153
38-2786/00
Maestro 60 Tall RCH
7-2

Installation manual
14
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:
1Remove the Allen screws with an Allen key (1).
1Hold the strip and unscrew the self-tapping screw.
1Remove the strip (2).
1
2
38C-2556
4S
3S
7-3

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
Permitted for
this appliance.
Yes
Yes
Yes
Yes
Yes
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

2My Flue Assist is a DRU web application to check whether an intended concentric system is permissible and provides
advice on how to adjust the appliance. Go to the DRU Service website for My Flue Assist. The information from the
installation manual is always leading.
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).
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Installation manual
18
DDDDCC
CCCBBB
DDCCCC
CBBBAA
CCCCC
BBBAAA
CCCB
BBAAAA
CBB
BAAAAA
BB
AAAAAA
A
AAAAAA
DCCCCC
BBBAAA
CCCCB
BBAAAA
CCBB
BAAAAA
BBB
AAAAAA
BA
AAAAAA
A
AAAAA
CCCCCB
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).
Table 7-4: Conditions for setting the appliance when using a roof terminal
G20/G25/G25.3/G30/G31
Situation
A
B
C
D
Air inlet guide
NO
YES (1)*
YES (2)*
YES (2)*
Restrictor slide
(Distance in mm)
Maestro 60
-
47 (B)**
47 (C)**
40 (D)**
Restrictor slide
(Distance in mm)
Maestro 60 Tall
-
70 (B)**
47 (C)**
40 (D)**
* This number must agree with the number on the air inlet guide.
** Adjust the restrictor slide to match the associated letter on the restrictor slide.
3For roof terminal: install a connection piece reducing the concentric system with a diameter of 200/130 mm to a
diameter of 150/100 mm directly onto the appliance. Then place the first metre of the concentric system
vertically, after which bends are permitted. Install the concentric system with a diameter of 150/100
mm throughout. Install the concentric system using stainless steel or aluminium/galvanised flue piping
throughout.

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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).
3In all tables below, 1 bend has been included in the concentric system. It is possible, however, to add extra bends. For
each additional bend, the maximum allowed horizontal length of the concentric system is reduced. This is done as
follows:
- An additional 90° bend shortens the maximum allowed length of the concentric system by 2 metres.
- An additional 45° bend shortens the maximum allowed length of the concentric system by 1 metre.
3At least 1 metre should always be placed on the appliance vertically, unless stated otherwise in the table.
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.
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0,5 - 0,8m
0 m
38C-744ZZ
1x90°
0
0
38C-744W
1x90°
Table 7-5a Table 7-5b
Setting
Air inlet guide
Restrictor slide
Apply
x
x
- Only use a 200/130 mm concentric system, including wall
terminal.
- In the case of this configuration, an unpainted stainless
steel wall terminal must be used..
- Factory setting: Air inlet guide 1 mounted, air inlet guide
2 and restrictor slide are supplied separately.
- Only use a 200/130 mm concentric system, including wall
terminal.
- Factory setting: Air inlet guide 1 mounted, air inlet guide
2 and restrictor slide are supplied separately.
Setting
Air inlet guide
Restrictor slide
Apply
x
x