Low NOx

- mark gas burners
C.75 – C.100
335 - 1040kW.
Low NO x

Standard clamp
Electronic ignition
transformer
Combustion head
(3 available
lengths)
Control and indicator panel:
- Local/distance Start/Stop
switch
- Auto/Manual switch
- Decrease/Increase of power
- Panel
Optional:
- Ballast PID
Fan motor
Security and control unit
MDE ® System
Air shutter servomotor
Isolated air unit
Ventilated air compartment
Painted aluminium alloy housing
Ionization measuring point
electrical compartment
RS.232 socket
Variatron ® (optional)
Innovative technology to control
energy.
Medium output burners used in heating
systems must meet five essential
requirements:
- simple implementation,
- easy operation,
- reliable and efficient settings,
- rational use of energy,
- low pollution emissions.
The C.75 – C.100 burners are
equipped with the innovative MDE ®
system, which allows technicians to
query the burner at any time and obtain
operating information and details of
startup phases.
Burners with separate compartments
combine our experience in designing
domestic appliances with our skills in
producing "medium output" equipment.
A comprehensive control panel on
the front of the burner contains the
pressure regulator and the MDE ®
system display. We recommend that
these burners be used with the
Variatron ® system.
The burners function using modulating
delivery air with natural gas and
propane. They are designed to be
installed on all types of boiler used in
residential, tertiary and industrial
buildings.
Burners are designed, developed and
built in compliance with the European
standards EN 676.
CUENOD burners bear the mark
and meet the requirements of
European Directives.
73/23/EEC = Low Voltage
89/336/EEC = Electromagnetic
compatibility
89/392/EEC = Machinery
90/396/EEC = Gas appliances
92/42/EEC = Efficiency requirements
for new mark hot water boilers.
CUENOD burners are made according
to the quality assurance requirements
of ISO 9001, certified by AFAQ.

Low NOx
The RTC ® system.
The combination of a functional
housing design, advanced combustion
head technology and Memorized Head
Settings (RTC ® ) ensures:
• Total access,
• Quick and easy maintenance,
•
Complete disassembly of all
combustion head components (short,
medium and long) in a single action
without having to remove the burner,
•
Memorization of all optimised startup
combustion settings during
maintenance procedures.
The AGP ® system.
Developed and perfected by CUENOD,
the AGP ® system has already won over
gas combustion specialists. The system
is fitted onto all our medium and high
output burners.
With this technology, burners guarantee:
• a completely stable air-gas mix,
• a high and constant CO 2 rate at all
burner output levels,
•
accurate control of excess air,
essentially for the optimum running of
condensation generators.
The AGP ® system also automatically
corrects the following:
• positive and negative gas pressure
variations,
• changes in air pressure due to
electrical circuit voltage fluctuations
and atmospheric pressure changes,
• output according to pressure
variations in the combustion
chamber, especially during ignition.
Low NOx combustion head.
•
The patented head design uses a
combustion air pre-rotation system that
increases air speed, homogenises the
mix and reduces the time combustion
products are in the flame, thus
reducing thermal nitric oxide formation.
•
The use of natural gas reduces the
amount of NOx produced to values of
up to 80mg/kWh - in compliance with
class 3 requirements of EN 676 - for
the majority of standard-sized boilers
(contact us for details).
Air
Combustion chamber
Opening
control
Gas
Ratio adjustment
Principle of the AGP ® System

Air intake.
Ventilation compartment ®
The new high-performance internal
recycling ventilation system, makes
these burners highly adaptable on all
boilers, enabling:
• Faster combustion stabilization
during startup.
•
Reduced pollution emission in
compliance with European
regulations.
• Extremely low noise level (isolated
air system) that can be further
reduced through the use of an
optional louvre.
• Thermal output between 90 and
94%, according to the type of boiler.
In addition, the linear air shutter (volet
d’air ® ) simplifies and improves
adjustments.
Main air
intake.
Multiple air intakes cool the fan motor
and ensure a continuous supply of
combustion air.
Integrated electrical ®
compartment
Air intake.
The electrical components are installed
in a compartment isolated from the air
circulation and dust. This ensures that
these burners are IP 54 compliant.
These burners are IP 54 only with the
transparent plastic cover.
This highly accessible compartment
contains:
• security box,
• ionization current measuring point,
• RS.232 socket,
• motor-fan contact switch,
• air shutter servomotor,
• ignition transformer,
• terminal board and automatic control
switches,
• nine cable entries with cable glands,
• space to insert the speed variator:
Variatron ® ,
•
control panel seen through a
detachable window, including:
Start-Stop switch, local-distance
switches, Auto-Manu, pushbutton for
manual output adjustment and
control circuit fuse,
• position for output regulator,
•
real-time display screen showing
data from the MDE ® system.

Low NOx
Easy installation.
The unique design and researched
packaging provides:
• Quick and reliable generator
compatibility.
• Significantly quicker assembly.
• Precise, faultless connections.
• Rack assembly without the need for
any additional procedures: assembly
and air-tightness inspection are
carried out in the factory.
• Accurate adjustment using clear and
precise combustion head and
servomotor markings.
Optimal efficiency.
•
The advanced housing design and
separate air and electrical systems
provide full access to all
components.
• All electrical components use plugand-socket
connections.
The MDE ® system:
Operating Data Memorization.
Burners are equipped with a new
operating system that may be
consulted at any time. The system
provides two types of data:
1 — "Instantaneous" information
- burner startup cycle
- power supply measurement,
- flame signal measurement.
2 — "Stored" information
- Burner operation data,
including operating time
- conditions of use procedures.
This information, available in real
time, can be exported and referenced
using a laptop computer running
Cuenocom software. The information
can then be sent to the operating
system to facilitate maintenance.
This information is available on the
front panel of the burner or may be
obtained remotely using a modem.

Performance charts.
daPa
80
60
40
20
0
C.75 GX 507 p20/25
mbar
0
100 300 500 700 900 1100 kW
140 335 750
C.75 GX 507/8 p37-148-300
daPa
mbar
8
6
4
2
daPa
80
60
40
20
0
C.100 GX 507 p20/25
mbar
0
100 300 500 700 900 1100 kW
170 520 1040
C.100 GX 507/8 p37-148-300
daPa
mbar
8
6
4
2
Packing.
The burner is delivered in three
separately packaged palettes weighing
between 74 and 79kg depending on
the model.
• Burner body:
- Integrated electrical bearing plate,
- Boiler plate,
- Documentation, including:
- operating instructions,
- electrical and hydraulic
diagrams,
- certificate of guarantee.
• Combustion head:
- front boiler attachment, a set of
fasteners.
• Gas rack:
- valve set and collector.
80
8
80
8
60
6
60
6
40
4
40
4
Front panel boring.
20
2
20
2
0
0
100 300 500 700 900 1100 kW
140 335 750
Output levels.
0
0
100 300 500 700 900 1100 kW
170 530 1040
Ø 260max
Ø 195
C.75 49 AQ 0924 C.100 49 AQ 0925
20/25 37/148 300 20/25 37/148 300
Output KW mbar mbar mbar mbar mbar mbar
min max min max min max min max
Burner (kW) 335 680 750 750 530 720 1040 1040
Min. 1 st startup (kW) 140 — — — 170 — — —
Boiler (kW) 310 625 690 690 490 665 960 960
In bold, recommended ø.
Bulk and dimensions.
valve
A minimum of 0.80m must be allowed
on either side of the burner for
maintenance purposes.
Ventilation in the boiler room.
1.2m 3 of new air is required for every
kWh produced by the burner.
Gas rack.
The rack can only be installed
horizontally, to the right or left.
Note:
The burner may be installed with the
casing at the top or bottom.

Low NOx
Installation.
The supply piping section is calculated to
restrict energy loss to between 0.5 and
1mbar at gas pressures of 20 and
37mbar, and between 5 and 10mbar at
pressures of 150 and 300mbar, without
affecting the pressure regulator station.
The piping diameter must be greater
than the filter diameter.
The following information shows the gas
flows that correspond to the maximum
burner output, at 15°C and 1013mbar.
Gas flows.
Flow in m 3 /h C.75 GX C.100 GX
20/25 37/148 300 20/25 37/148 300
mbar mbar mbar mbar mbar mbar
Gas type min max min max min max min max
Nominal gas flow
at 15°C and 1013 mbar
Natural group H m 3 /h 35 72 — 79 56 76 — 110
Hi = 9,45 KWh/m 3
Natural group L m 3 /h 41 79 — 92 65 88 — 103
Hi = 8,13 KWh/m 3
Propane P m 3 /h 14 — 31 — 22 — 43 —
Hi = 24,44 KWh/m 3
Density kg/m 3 = 1,98
The gas rack is prewired and factorytested.
Hydraulic diagram.
Air
Gas
Key:
F4 Min. gas pressure switch
F6 Air pressure switch
M1 Fan motor
T2 Ignition transformer
Y10 Air shutter servomotor
Y13 Main gas valve
Y15 Safety gas valve
101 Fan
103 Air shutter
106 Filter
110 Gas injector
119.1 Gas pressure point
119.2 Combustion chamber pressure
point
119.3 Air pressure point
Electrical connection.
Electrical installations must be carried out
according to standard NF C 15.100
and other standards currently in force.
Particular attention must be paid to the
burner supply main disconnect switch
which must be able to carry the total
circuit output and isolate the power and
control circuits during maintenance.
- from the power circuit:
between L1, L2 and L3 terminals.
This circuit must be protected using
AM fuses.
Power supply.
Power supply connection:
(see diagram).
- from the control circuit: between the N
(neutral) and L1 (live) terminals.
In the interests of safety, an isolating
transformer and a 30mA differential
circuit breaker should be used when a
230V three-phase power supply is
used.
This circuit must be protected using a
10A fuse.
Burner
Motor output and three-phase circuit protection.
Burner C.75 GX C.100 GX
Motor output kW 1,1 1,5
230V or 400V fuse A 10 10

Low NOx
Output adjustment.
Operation.
After startup (which uses approx. 15%
of the normal flow), the thermal output
progressively increases through two
different flows.
These can be adjusted to:
- “Full” or “off”: progressive output
increase (between 20 and 30
seconds).
The equipment benefits from all the
combustion control of the AGP ®
system.
- “Full” or “low”: this type of setting
offers not only the advantages of the
AGP ® system, but saves energy by
operating at reduced power.
- “Modulating”: the power can be
adapted to requirements. High
performance installations offer a
wide range of options:
- adjustment of generator
temperature to suit atmospheric
conditions or to an existing setting.
- adjustment to a required constant or
variable temperature,
- parallel adjustment of several
generators to suit a decreasing or
constant temperature,
- cascade burner, pump and boiler
adjustment for a temperature that is
constant, variable, etc…
Setting connection.
- Connect terminals 84 and 85 for “full”
flow or “off”.
- Use the three-wire contact instruments
for a “full” or “low” flow controlled by a
thermostat or pressure switch.
- A kit is provided with a prewired fusebase
for a “Modulating” flow using an
RC.40 or RC.6170 regulator. The
control system is mounted on the
control panel in the position reserved
for this purpose.
Using a standard electronic regulator
(PID): this type of regulator is mounted
in the standardized position reserved
for this purpose (48 x 48 or 48 x 96).
Note: The RC.40 or RC.6170 and the
“alarm” output on certain regulators
control operation.
Imprimé en Italie par Musumeci Industrie Grafiche S.p.A.
We reserve the right to upgrade equipment where required.
10/2003 - EN