Cosmogas MYDENS 15C/24C/34C INSTALLATION, USE AND MAINTENANCE MANUAL (62403777 - R03 01-01-2019_UK - ADVECO)
Page 1
GAS WALL-MOUNTED
CONDENSING BOILER
INSTALLATION, USE
AND MAINTENANCE
MANUAL
MYDENS
62403777 - R03 01-01-2019_UK - ADVECO
Page 2
Page 3
CONTENTS
1 - GENERAL SAFETY WARNINGS ..................................................................................................................................................5
1.1 - National installation laws.......................................................................................................................................................5
2 - GENERAL INFORMATION ...........................................................................................................................................................6
2.1 - Presentation ..........................................................................................................................................................................6
2.2 - Overview of models ..............................................................................................................................................................6
2.3 - Accessories included ............................................................................................................................................................7
2.4 - Manufacturer .........................................................................................................................................................................7
2.5 - Meaning of symbols used .....................................................................................................................................................7
2.6 - Maintenance .........................................................................................................................................................................7
2.7 - Disposal ................................................................................................................................................................................7
3 - MAIN COMPONENTS ...................................................................................................................................................................8
4 - OPERATION ...............................................................................................................................................................................10
4.1 - Operation and intended use of the appliance .....................................................................................................................12
4.2 - Characteristic residual head curves at the central heating system .....................................................................................13
4.3 - Characteristic curve of the domestic hot water head losses ...............................................................................................13
5 - INSTALLATION ...........................................................................................................................................................................14
5.1 - Opening the package ..........................................................................................................................................................14
5.2 - Dimensions and minimum distances to be observed .........................................................................................................14
5.3 - Choosing where to install the appliance .............................................................................................................................14
5.4 - Delivery and return..............................................................................................................................................................14
5.5 - Low-temperature systems (or underoor heating) ..............................................................................................................15
5.6 - Domestic hot and cold water...............................................................................................................................................15
5.7 - Gas .....................................................................................................................................................................................15
5.8 - Unit assembly .....................................................................................................................................................................16
5.9 - Condensate drain................................................................................................................................................................16
5.10 - Safety valve ......................................................................................................................................................................16
5.11 - Hydraulic and gas connections, and mounting of the lower cover ....................................................................................17
5.12 - Hydraulic connections for model -- B boiler ......................................................................................................................18
5.13 - Polyphosphate softener (on request) ................................................................................................................................18
5.14 - Electrical connections: details ...........................................................................................................................................19
5.14.1 - Connecting the power supply cable ....................................................................................................................20
5.14.2 – Choosing the room thermostat/ chronothermostat .............................................................................................20
5.14.3 - Connecting the room thermostat/ chronothermostat ...........................................................................................21
5.14.4 - CR04 remote time control (on request) ...............................................................................................................21
5.14.5 - Installing the external temperature sensor (on request) .....................................................................................21
5.14.6 - 0-10 VDC type dialogue ......................................................................................................................................21
5.14.7 - Alarm contact ......................................................................................................................................................21
5.15 - Connecting appliances in a cascade ................................................................................................................................22
5.16 - Connecting the boiler to indirect water heater with coil ....................................................................................................23
5.16.1 - Anti-legionella ......................................................................................................................................................23
5.17 - Burned gas exhaust and combustion agent air intake pipe ..............................................................................................24
5.17.1 - Type of intake/exhaust B23 and B23P ................................................................................................................25
5.17.2 - “Split 80/80PP” system (polypropylene) (type C43; C53; C83; C93) ..................................................................26
5.17.3 - “Split 80/80PP” system (type C43; C53; C83; C93): accessories available ........................................................27
5.17.4 - “Split 80/80PP” system (type C43; C53; C83; C93): installation examples ........................................................28
5.17.5 - “60/100PP vertical coaxial” system (polypropylene) (type C13; C33) .................................................................29
5.17.6 - “60/100PP horizontal coaxial” system (polypropylene) (type C13; C33) ............................................................30
5.17.7 - “60/100PP coaxial” system: accessories available .............................................................................................31
5.17.8 - “60/100PP coaxial” system: installation examples ..............................................................................................32
5.17.9 - “80PP single” system (polypropylene) (type B23 or B23P) .................................................................................33
5.17.10 - “80PP single” system: accessories available ....................................................................................................34
5.18 - Installing and uninstalling the MYDENS external cover kit (on request) ...........................................................................34
6 - START-UP ...................................................................................................................................................................................37
6.1 - Start-up ...............................................................................................................................................................................37
6.1.1 - Instructions to the user ..........................................................................................................................................37
6.1.2 - Filling the condensate drain siphon ......................................................................................................................37
6.1.3 - Filling the central heating system ..........................................................................................................................37
6.2 - General recommendations regarding the gas supply .........................................................................................................38
6.3 - Type of gas for which the appliance is set. .........................................................................................................................38
6.4 - Conversion of the appliance from one type of gas to another ............................................................................................39
6.5 - Ignition ................................................................................................................................................................................41
6.6 - Controlling the supply gas pressure and any adjustments .................................................................................................41
6.7 - Controlling the level of CO2 and any adjustments ..............................................................................................................42
6.8 - Adjusting the power in central heating mode (Range Rated) .............................................................................................44
6.9 - Adjusting the domestic hot water ow rate .........................................................................................................................44
7 - USE .............................................................................................................................................................................................45
7.1 - Checking the cock opening .................................................................................................................................................45
7.2 - Checking the central heating system pressure ...................................................................................................................45
COSMOGAS
3
MYDENS
Page 4
CONTENTS
7.3 - Generali information............................................................................................................................................................46
7.4 - Ignition procedure ...............................................................................................................................................................46
7.5 - Summer operating mode ....................................................................................................................................................46
7.6 - Winter operating mode........................................................................................................................................................46
7.7 - Adjusting the instantaneous domestic hot water .................................................................................................................47
7.8 - Central heating....................................................................................................................................................................47
7.9 - Thermostatic adjustment .....................................................................................................................................................48
7.10 - Climatic adjustment...........................................................................................................................................................48
7.10.1 - Climatic adjustment: which systems? .................................................................................................................48
7.10.2 - Climatic adjustment: precautions during adjustment ..........................................................................................48
7.10.3 - Climatic adjustment: setting the parameters .......................................................................................................48
7.10.4 - Climatic adjustment: adaptation to different climatic areas .................................................................................49
7.10.5 - Climatic adjustment: switching the central heating service on and off ................................................................49
7.10.6 - Climatic adjustment with room compensation .....................................................................................................49
7.11 - Timers for the various functions ........................................................................................................................................51
7.12 - Pump and diverter valve anti-block function .....................................................................................................................51
7.13 - Anti-freeze protection ........................................................................................................................................................51
7.14 - Automatic system lling (on request) ................................................................................................................................51
7.15 - “User prole” .....................................................................................................................................................................52
7.16 - “Installer prole” ................................................................................................................................................................54
7.16.1 - Parameters for cascade systems ........................................................................................................................58
7.17 - Diagnostics .......................................................................................................................................................................59
7.17.1 - Diagnostics: locks “Loc” ......................................................................................................................................59
7.17.2 - Diagnostics: errors “Err” ......................................................................................................................................62
7.17.3 - Diagnostics: alarms “AttE” ..................................................................................................................................65
8 - MAINTENANCE ..........................................................................................................................................................................66
8.1 - General recommendations..................................................................................................................................................66
8.2 - Maintenance protocol..........................................................................................................................................................67
8.2.1 - Checking the system water pressure and any leaks .............................................................................................67
8.2.2 - Checking the gas pressure and any leaks ............................................................................................................67
8.2.3 - Checking the condition of the safety valve ............................................................................................................67
8.2.4 - Checking the condition of the safety and control devices .....................................................................................68
8.2.5 - Checking the condition of the electrical system ....................................................................................................68
8.2.6 - Checking the operation of the main switch ...........................................................................................................68
8.2.7 - Checking the correspondence of the adjusted temperatures in the heating and domestic hot water systems ....68
8.2.8 - Checking if the device is triggered in case of gas failure ......................................................................................68
8.2.9 - Checking the condition of the air intake and ue exhaust ducts ...........................................................................68
8.2.10 - Checking the ignition and detection electrodes .................................................................................................68
8.2.11 - Checking the condition of the air vent valves ......................................................................................................68
8.3 - Removing the casing and accessing the internal components ...........................................................................................69
8.4 - Dismantling the burner fan assembly..................................................................................................................................70
8.5 - Cleaning the burner and the primary heat exchanger (fumes side) ....................................................................................70
8.6 - Correctly positioning the ignition and detection electrodes ................................................................................................71
8.7 - Dismantling the ignition and detection electrodes .............................................................................................................71
8.8 - Dismantling and replacing the gas valve ............................................................................................................................72
8.9 - Checking the expansion tank ..............................................................................................................................................73
8.10 - Cleaning the condensate conveyor siphon .......................................................................................................................74
8.11 - Removing the air vent valve ..............................................................................................................................................75
8.12 - Replacing the pump motor ................................................................................................................................................75
8.13 - Removing the central heating circuit pressure sensor ......................................................................................................75
8.14 - Removing the diverter valve servomotor ..........................................................................................................................76
8.15 - Removing the diverter valve .............................................................................................................................................76
8.16 - Removing the ow meter ..................................................................................................................................................76
8.17 - Removing the safety valve ................................................................................................................................................77
8.18 - Secondary heat exchanger for the production of DHW ....................................................................................................77
8.19 - Emptying the appliance on the central heating side .........................................................................................................78
8.20 - Emptying the appliance on the domestic hot water side ...................................................................................................78
8.21 - Minimum and maximum power ........................................................................................................................................78
8.22 - Checking the ionisation current ........................................................................................................................................79
8.23 - Checking combustion efciency........................................................................................................................................79
8.24 - Water temperature measurement sensors .......................................................................................................................79
8.25 - External temperature sensor.............................................................................................................................................79
8.26 - Wiring diagram ..................................................................................................................................................................80
9 - TECHNICAL DATA ......................................................................................................................................................................82
10 - COMMAND MENU DIAGRAM ..................................................................................................................................................84
11 - EU DECLARATION OF CONFORMITY ....................................................................................................................................85
12 - ErP PRODUCT SHEET .............................................................................................................................................................86
MYDENS
4
COSMOGAS
Page 5
1 - GENERAL SAFETY WARNINGS
If you smell gas
1. - Close the gas cock.
2. - Ventilate the room.
3. - Do not switch on any electric device, telephone included.
4. - From another room, call a professionally qualied technician
immediately or the gas supply company. Call the Fire Service
if the former are not available.
If you can smell combustion products
1. - Switch the appliance off.
2. - Ventilate the room.
3. - Call a professionally qualied technician.
Explosive or highly ammable products
Do not store or use explosive or highly ammable materials
such as paper, solvents, paints, etc. in the room where the
appliance is installed.
Installation, modications
The gas appliance must be installed, calibrated or modied
by professionally qualied staff, in compliance with national
and local regulations, as well as the instructions in this
manual.
Incorrect installation or poor maintenance can cause
damage or injury to persons, animals or objects, for which
the manufacturer cannot be deemed liable.
The appliance exhaust must be connected to a burned
gas evacuation pipe. Failure to comply with this regulation
leads to serious risks for the safety of persons and animals.
A domestic hot water temperature level exceeding 51°C
can cause permanent damage or injury to persons, animals
and objects. In particular, protect children, the elderly and
people with disabilities against any possible risks of scalds,
by inserting devices that limit the usage temperature of the
DHW to users.
The parts conducting the fumes must not be modied.
Do not obstruct the ends of the intake/exhaust pipes.
Do not leave parts of the packaging and any replaced parts
within the reach of children.
Seal the adjustment devices after every calibration.
In agreement with the provisions for use, the user must
keep the installation in good working order and guarantee
reliable and safe operation of the appliance.
The user must have maintenance performed on the
appliance by a professionally qualified technician in
compliance with national and local regulations and this
manual.
We would also highlight the convenience of an annual
scheduled maintenance contract with a professionally
qualied technician.
Before performing any cleaning or maintenance operations,
disconnect the appliance from the mains power supply and/
or use the cut-off devices.
After having performed any cleaning or maintenance
operations, make sure that all internal parts of the appliance
are dry before re-connecting the electric power supply.
This appliance is not intended for use by persons (including
children) with reduced physical, sensory and mental
capabilities or a lack of experience or knowledge, unless
they are supervised or have been instructed on use of the
appliance by a person responsible for their safety.
This manual is an integral and essential part of the
product and must be kept carefully by the user for future
consultation. If the appliance needs to be transferred or if
you should move and leave the unit to another user, always
ensure that this manual remains with the new user and/or
installer.
Any optionals or kits added later must be original Cosmogas
products.
This appliance must be intended only for the use for which
it has been expressly declared: central heating water for
closed circuits intended for central heating of rooms for
civil and domestic use, production of domestic hot water
for civil use.
Any contractual and non-contractual liability on the part
of the manufacturer is excluded for damage caused by
installation errors or usage errors and, in all cases, following
a failure to comply with the instructions given by the
manufacturer or with applicable national and/or local laws.
For safety reasons and to safeguard the environment, the
packaging components must be disposed of in the relevant
separate waste collection centres.
In case of breakdown
In the event of a fault and/or poor operation of the appliance,
disconnect it and do not attempt to carry out any repairs.
Contact a professional ly qualified technician only. If
components need to be replaced, these must be original spare
parts. Failure to comply with the above may jeopardise the
safety of the appliance.
Professionally qualied technicians.
A ‘professionally qualied technician’ means a person with
specic technical skill in the sector of central heating system
components and the production of domestic hot water for
sanitary and civil uses, electric installations, and systems for
the use of combustible gas. Such people must have the skills
envisaged by the law.
Technical drawings
All the drawings shown in this manual relating to electrical,
hydraulic or gas installation systems must be understood to be
purely illustrative. All the safety devices, auxiliary devices and
the diameters of the electrical, hydraulic and gas pipes must
always be checked by a professionally qualied technician,
to make sure they satisfy the applicable laws and regulations.
1.1 - National installation laws
Respect the national regulations, provisions, directives and
laws in force.
- Ministerial Decree n°37 dated 22/01/2008 (former Law n°46
dated 05/03/90)
- Law n° 10 dated 09/01/91
- Presidential Decree n° 412 dated 26/08/93
- Presidential Decree n° 551 dated 21/12/99
- Legislative Decree n° 192 dated 19/08/05
- Legislative Decree n° 311 dated 29/12/06
- UNI 7129-1 standard
- UNI 7129-2 standard
- UNI 7129-3 standard
- UNI 7129-4 standard
- UNI 7129-5 standard
- UNI 7131 standard
- IEC 64-8 standard
COSMOGAS
5
MYDENS
Page 6
2 - GENERAL INFORMATION
2.1 - Presentation
Congratulations! You have purchased one of the best products on the market.
Each individual part is proudly designed, manufactured, tested and assembled within the COSMOGAS
facilities, thus guaranteeing the best quality control.
2.2 - Overview of models
MYDENS XXY
“P” = Boiler for the instantaneous production of DHW and central heating;
“B” = Boiler set up for coupling to an indirect water heater with coil;
“C” = Central heating only boiler;
15 = Boiler with maximum heat input of 14 kW
24 = Boiler with maximum heat input of 25 kW
34 = Boiler with maximum heat input of 32 kW
Gas condensing boiler tted with a full premix burner.
MYDENS
6
COSMOGAS
Page 7
2 - GENERAL INFORMATION
2.3 - Accessories included
The boiler is supplied with the following accessories:
Quantity No.
n° 1 LOWER COVER 61405266
n° 1 GAS CONVERSION KIT
n° 1 INDIRECT WATER HEATER SENSOR
n° 1 PREINSTALLATION TEMPLATE 61804018
n° 1
n° 1 CONNECTIONS KIT
CONNECTIONS KIT
(including appliance wall support KIT)
Description
For 15 and 24 models 62630310
For 34 models 62630311
Only for “B” (factory assembled) and “C”
models
For all 15 and 24 “C”, “B” and “P” models
For all 34 “C”, “B” and “P” models
Only for “B” models
2.4 - Manufacturer
COSMOGAS srl
Via L. da Vinci 16
47014 - Meldola (FC) Italy
Tel. (+39) 0543 498383
Fax. (+39) 0543 498393
www.cosmogas.com
info@cosmogas.com
Code
62110071
62629825
62629826
62629816
Figure
2.5 - Meaning of symbols used
WARNING!
Electric shock hazard Failure to comply with these warnings
may jeopardise the working order of the appliance or cause
serious damage or injury to persons, animals or objects.
Generic hazard
Failure to comply with these warnings may jeopardise the
working order of the appliance or cause serious damage or
injury to persons, animals or objects.
Important indication symbol
2.6 - Maintenance
A regular annual maintenance check on the appliance is
advised for the following reasons:
- to maintain high efciency and manage the central heating
system economically (with low fuel consumption);
- to achieve a high level of operating safety;
- to maintain the level of environmental compatibility of the
combustion high;
2.7 - Disposal
The crossed wheelie bin symbol means that the product
must not be thrown away in the ordinary rubbish bin (i.e. in
with “mixed urban rubbish”); it must be dealt with separately,
in order to undergo suitable operations for it to be reused or
treated, so that any substances that are dangerous for the
environment can be removed and disposed of safely. This
will enable all the raw materials to be recycled. The user is
responsible for getting rid of the boiler at the end of its life,
delivering it to a recycling centre run by the local authority or
city hygiene companies, or, when he/she buys a new boiler,
giving the product that has been replaced to the dealer, who is
obliged to take it under the terms of EU Directive 2012/19/EU.
For further information regarding correct decommissioning
of these units, users can contact the public service in charge
or retailers.
To do this, please see the table in section 8.2.
Offer your customer a scheduled maintenance contract.
COSMOGAS
7
MYDENS
Page 8
3 - MAIN COMPONENTS
14
14
16 18
19
17
020002.01.002
13
12
20
23
9
8
7
6
22
54
24
25
27
5
28
4
2
1
1 - Command and control board
2 - Electric connections board
3 - ---------4 - Lower cover
5 - Secondary heat exchanger for domestic hot water
6 - Central heating water pressure sensor
7 - Safety valve
8 - Fan
9 - Air/gas manifold
10 - ---------11 - ---------12 - Detection electrode
13 - Expansion tank
14 - Support attachments
15 - ----------
16 - Air intake and burned gas exhaust ttings
17 - Combustion analysis points
Figure 3-1 – Boiler internal components
29
3130
18 - Fumes temperature sensor (Par.
temperature fuse
19 - Spark generator
20 - Ignition cables
21 - ---------22 - Air inlet manifold
23 - Back ue preventer valve
24 - Gas valve
25 - Circulation pump
26 - ---------27 - Front casing
28 - Domestic hot water ow meter
29 - Domestic hot water ow meter sensor (Par.1062)
30 - Display
31 - Control panel
32 - ---------54 - Primary heat exchanger fuse
1006) and ue gas
MYDENS
8
COSMOGAS
Page 9
3 - MAIN COMPONENTS
33
020002.01.003
53
52
34
35
36
37
51
50
49
48
47
46
45
44
38 40 41
33 - Front casing couplings
34 - Titanium-plated steel primary heat exchanger
35 - Double supply temperature sensor (Par. 1001 and
39
1005)
36 - Return temperature sensor (Par. 1007)
37 - Hydraulic supply unit
38 - By-pass pipe
39 - Central heating circuit drain cock
40 - Central heating circuit drain cock
41 - Domestic hot water temperature sensor (Par. 1002)
42 - System ll cock
Figure 3-2 – Boiler internal components
COSMOGAS
42
43 - Condensate collection tank
44 - Safety valve drain pipe
45 - Return hydraulic unit
46 - Air vent valve
47 - 3-way diverter valve
48 - Air vent valve drain pipe
49 - Condensate drain siphon
50 - Air/gas mixing unit
51 - Burner
52 - Drain pipe for any water coming from the combustion
agent air pipe
53 - Ignition electrodes
54 = Primary heat exchanger fuse (not present)
9
43
MYDENS
Page 10
4 - OPERATION
Figure 4-1 – Hydraulic layout
MYDENS 24P
MYDENS 34P
Figure 4-2 – Hydraulic layout
MYDENS 15B
MYDENS 24B
MYDENS 34B
MYDENS
10
COSMOGAS
Page 11
4 - OPERATION
Key for gures 4-1, 4-2, 4-3:
1 = Boiler
2 = Combustion agent air inlet
3 = Fumes outlet
4 = Fumes temperature sensor (Par. 1006) and ue gas
temperature fuse
5 = Sealed chamber
6 = ---------7 = Water collection pipe coming from the combustion agent
inlet pipe
8 = Expansion tank
9 = Supply temperature sensor (Par. 1001)
10 = Supply temperature safety sensor (Par. 1005)
11 = Burner
12 = Titanium-plated stainless steel VRC type heat exchanger
13 = Fan
14 = Return temperature sensor (Par. 1007)
15 = Condensate collection siphon with sediment decanter
16 = Air/gas mixer
17 = Pneumatic gas valve
18 = Safety valve
Figure 4-3 – Hydraulic layout
MYDENS 15C
MYDENS 24C
MYDENS 34C
19 = Central heating water pressure sensor (Par. 1033)
20 = Circulation pump
21 = Air vent valve
22 = Diverter valve
23 = Plate heat exchanger for domestic hot water
24 = Domestic hot water temperature sensor (Par. 1002)
25 = Central heating by-pass valve
26 = Domestic hot water ow meter (Par. 1062)
27 = Domestic hot water lter
28 = Supply circuit drain cock
29 = Return circuit drain cock
30 = Central heating system ll cock
31 = Central heating circuit supply
32 = Domestic hot water outlet
33 = Gas inlet
34 = Domestic cold water inlet
35 = Central heating circuit return
36 = Collector for condensate drain and safety valve
37 = Central heating system
38 = Domestic hot water system
39 = Water supply attachment for lling the system
40 = Supply to indirect water heater
41 = Return from indirect water heater
42 = Expansion tank for indirect water heater
43 = Hydraulic safety unit
44 = Cold water supply
45 = Safety valve
46 = Cold water
47 = Domestic hot water
48 = Indirect water heater
COSMOGAS
49 = Indirect water heater temperature sensor (Par. 1002)
50 = Primary heat exchanger fuse (not present)
11
MYDENS
Page 12
4 - OPERATION
4.1 - Operation and intended
use of the appliance
This product is a condensing, gas appliance, intended
for the generation of central heating and production of
domestic hot water for civil use.
Make the adaptation between the boiler and the system,
selecting the characteristic residual head curve in gure 4-5
deemed most suitable from those available.
The maximum useful output power is always guaranteed for
the production of domestic hot water, as the central heating
service switches off at every request for domestic hot water.
The temperature of the domestic hot water is adjusted
following the procedure in section 7.7.
The following types of systems can be set up depending on
the model:
A) - MYDENS -- “P”. With this boiler it is possible to create
a system to produce instantaneous domestic hot water
and a central heating system with the heating elements
operating at a temperature between 30°C and 80°C. An
example of this type of set-up is given in g. 4-1.
B) - MYDENS -- “B”. With this boiler it is possible to create
a system to produce domestic hot water via a coil-type
storage indirect water heater and a central heating system
with the heating elements operating at a temperature
between 30°C and 80°C. An example of this type of set-up
is given in g. 4-2.
C) - MYDENS -- “C”. With this boiler it is possible to create
a system for central heating only with the heating elements
operating at a temperature between 30°C and 80°C. An
example of this type of set-up is given in g. 4-3.
This model can be connected to a coil-type indirect water
heater also after installation, lled via a diverter valve or a
pump outside the boiler.
In all of the boiler versions previously described, connecting
the domestic hot water service is not essential; if the boiler
is used for central heating only, just connect the cold water
pipe to ll the central heating system and close the DHW
outlet tting.
All boiler versions previously described, can be connected
to a room thermostat for adjustment of the central heating.
To perfect the quality of the heating service, an external
temperature sensor can be connected (climatic adjustment)
to automatically adjust the supply temperature depending
on the external temperature. In this case, the room
thermostat can compensate for the room temperature via
an ON /OFF or two-step command.
For further information regarding climatic adjustment, refer
to section 7.10.
This appliance must be connected to a central heating
system and to a domestic hot water distribution network,
compatible with the features, performance and power of
the appliance itself.
Before installing the appliance, the central heating
system and the domestic hot water system must be
washed thoroughly in order to remove any residues or
impurities, which could compromise the working order of
the boiler.
This boiler is not designed to be installed in the open air;
it must not be exposed to temperatures below 0.5°C and
above 50°C. Choose a place sheltered from weathering
and frost. If the appliance is equipped with a special
external cover kit (see section 5.18) it can be installed
outside, in a place partially protected from rain, snow and
hail, such as a balcony or porch (see gure 4-4).
Check gure 5-1 concerning the minimum safety
distances for installation and future maintenance.
Figure 4-4 – Example of a partially protected place
MYDENS
Figure 4-4 key – Distances “A” and “B” must
be assessed during installation so that rain
does not reach the appliance directly.
12
COSMOGAS
Page 13
650
H (mbar)
4 - OPERATION
RIC17 - 2012
600
550
500
450
400
350
4.2 - Characteristic residual head
curves at the central heating system
The residual head at the appliance connections is given as
a graph in gure 4-5.
The modulation range (particularly “x”) can be checked
using the graph in gure 4-5.
RIC27-2013
300
250
200
150
100
50
0
0 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300
Figure 4-5 – Residual head
X
Q (l/h)
4.3 - Characteristic curve of the
domestic hot water head losses
Each boiler exerts resistance to the passage of domestic
hot water (see the ow rate/pressure graph in gure 4-6).
The installer or project technician must take this into
consideration in order to guarantee the correct domestic hot
water ow rate to the utility.
3
2,5
2
1,5
Head losses (bar)
1
0,5
0
0 3,3 6,6 10 13,3 16,6
Figure 4-6 – Domestic hot water losses curve
COSMOGAS
Water ow rate (l/min)
13
MYDENS
Page 14
5 - INSTALLATION
Figure 5-1 – Minimum safety distances
5.1 - Opening the package
Take the product out of the cardboard box and remove any
protective lm.
5.2 - Dimensions and minimum
distances to be observed
For both installation and maintenance, it is necessary to leave
free spaces around the boiler, as shown in gure 5-1.
5.3 - Choosing where to
install the appliance
WARNING! The appliance must be installed
exclusively on a solid, vertical wall, which can bear the
weight.
The appliance must be installed inside your home, or
otherwise protected from atmospheric agents such as rain,
wind, sun, and especially freezing.
Choose the room and suitable position for installation,
taking into account the following factors:
- connection of the fumes exhaust/air intake pipes;
- connection of the gas supply pipe;
- connection to the water supply;
- connection to the central heating system;
- connection to the domestic hot water system;
- electric connection;
- connection to the drain for the condensate produced by
the boiler;
- electric connection of the room thermostat (where
applicable);
- connection to safety valve outlet;
- connection to the external temperature sensor (where
applicable);
This appliance must be installed in a place where
water leakages from the appliance itself, from the joints
between the pipes or from any drainage from the safety
valve, cannot cause damage to materials or items below
it.
1 - Central heating supply
3/4" in the 15 and 24 models
1" in the 34 model
2 - 1/2" DHW output (“P” models only)
2 - 3/4" indirect water heater supply (“B” models only)
2 - (not in “C” models)
3 - 3/4" indirect water heater return (“B” models only)
4 - 3/4" gas inlet
5 - 1/2" cold water inlet
6 - Central heating return
3/4" in the 15 and 24 models
1" in the 34 model
7 - Fumes exhaust
8 - Support attachments
9 - Ø20 condensate drain
Figure 5-2 – Boiler dimensions and attachments
centre-to-centre distances
5.4 - Delivery and return
WARNING! This boiler has a safety valve
calibrated at 3 bar. Therefore, it must not be installed
with a water head over 30 m.
WARNING! COSMOGAS is not liable for any
damage caused by incorrect use of additives in the
central heating system.
WARNING! The system after the appliance must
be made with materials that resist temperatures up to
95°C and pressure of 3 bar. Otherwise (e.g. with plastic
piping), the system must be tted with the relevant
protection and safety devices.
Before connecting the central heating pipes, wash the
system thoroughly to eliminate any waste (hemp, radiators
casting sand, etc.), which could damage the appliance. This
must also be performed if the appliance is replaced.
Figure 5-2 shows the positioning of the supply and return
ttings.
MYDENS
14
COSMOGAS
Page 15
5 - INSTALLATION
Install a metal mesh lter on the return pipe in order to
stop any system residues before they return to the boiler.
Do not use the appliance to introduce any type of
additive into the system.
A continuous intake of water into the central heating
circuit increases the content of oxygen and limescale,
with a risk of corrosion inside the heat exchanger body.
This reduces the boiler’s lifespan. Any leaks from the
central heating circuit must be repaired to prevent the
problem.
5.5 - Low-temperature systems
(or underoor heating)
WARNING! If the appliance is connected to a
domestic hot water recirculation circuit, install a safety
valve and an expansion tank of a suitable size for
managing the natural increase in the volume of water
during heating.
In gure 5-2, you can verify the position of the domestic hot
and cold water ttings.
Insert a closing cock before the cold water inlet, useful for
maintenance work.
Connecting the domestic hot water service is not essential;
if the boiler is used for central heating only, connect the cold
water pipe to ll the central heating system and close the
DHW outlet.
WARNING! The system after the appliance must
be made with materials that resist temperatures up to
95°C and pressure of 3 bar. Otherwise (e.g. with plastic
piping), the system must be tted with the relevant
protection and safety devices.
WARNING! When installing the boiler in a
low-temperature system, set parameters 2024 and
2111 to 45°C and parameters 2023 and 2110 to
20°C (see section 7.16).
With this setting, the boiler will adjust the supply to a
temperature between 20°C and 45°C. No adjustment from
the command panel (also via climatic adjustment) can
supply water at a temperature over 45°C.
WARNING! If the boiler is installed in an
underoor system made with plastic piping, all of the
necessary precautions must be taken against corrosion
due to oxygen in the water:
make sure that the system is made with plastic pipes
with oxygen permeability not exceeding 0.1 g/m3 at
40°C. Should the pipe not meet these characteristics, the
radiant panel circuit must be isolated from the boiler, via
a plate heat exchanger suitable for resisting the corrosion
generated by the oxygen dissolved in the water.
5.6 - Domestic hot and cold water
5.7 - Gas
WARNING! Do not power the appliance with
gases other than those specied.
WARNING! Check that the gas and supply
pressure are those for which the boiler has been
adjusted.
Two situations are possible:
A - the gas and supply pressure correspond to the
adjustment of the boiler. In this case, it can be
connected;
B - the gas and supply pressure do not correspond to the
adjustment of the boiler. In this case, the boiler must
be converted to the type of gas and supply pressure
corresponding to those of the supply available.
The boiler is supplied with the special gas conversion kit.
Before installation, clean the inside of the gas supply
pipe thoroughly;
Install a shut-off cock on the gas supply pipe;
To prevent damage to the appliance gas control unit, run
a leak test at a pressure not exceeding 50 mbar;
If the gas system must be inspected at pressures over
50 mbar, turn the cock positioned immediately before the
boiler, to isolate it from the system.
WARNING! If water hardness exceeds 25°F, we
recommend installing a polyphosphate softener (see
section 5.13).
WARNING! Install a lter with mesh no wider
than 0.5 mm² in the domestic cold water inlet.
WARNING! The domestic hot water circuit must
be made with materials resistant to temperatures of
at least 95°C and a pressure of 10 bar. Otherwise (e.g.
with plastic piping), the system must be tted with the
relevant protection and safety devices.
COSMOGAS
Use gure 5-2 to check the position of the appliance gas
tting. The cross-sections of the pipes in the gas supply
system must always guarantee a gas supply that is
sufcient to cover the maximum requested.
15
MYDENS
Page 16
5 - INSTALLATION
Figure 5-3 – Support plugs
5.8 - Unit assembly
Refer to gure 5-3:
1.- put the paper template, provided with the appliance,
against the wall;
2.- check that the template is square;
3.- mark the holes for the plugs and hydraulic ttings on the
wall;
4.- remove the paper template;
5.- make the holes “A” and insert the wall plugs “B”;
6.- make the boiler hydraulic and gas connections;
7.- hang the boiler on the plugs “C”;
8.- make the hydraulic connections.
5.9 - Condensate drain
There is a siphon inside the boiler for the evacuation of
condensate (see gure 3-2, detail “49”) and to prevent
combustion products from escaping. The end of the siphon
is pipe “F” in gure 5-4. This end must be conveyed into
another, anti-odour siphon (gure 5-6, detail “G”) to prevent
bad odours returning to the environment (the anti-odour
siphon “G” is supplied on request).
In particular, the condensate drain system must:
be for rooms used for residential purposes and for
ofces with more than 10 users; it can be connected
to the domestic waste disposal plant by means
of appropriate siphon with disjunction, capable of
preventing the pressurisation of the system (the siphon
is inside the boiler) and the return of bad odours from
the sewers (detail “G” in gure 5-6). If the room used for
ofce purposes has fewer than 10 users, before up the
domestic waste drain, install a condensate neutraliser
(see section 9 for the acidity value of the condensate and
the quantities).
be performed with a pipe with an internal diameter equal
to or greater than 13 mm;
be installed in such a way as to prevent the liquid
from freezing; therefore pay attention to any external
sections. It is prohibited to drain into gutters or rainwater
drainpipes;
slope continuously towards the drain point; avoid high
points, which could pressurise the pipe;
020002.01.017
F
Figure 5-4 – Condensate drain pipe
MYDENS
5.10 - Safety valve
The appliance is protected against overpressures by a
safety valve calibrated to 3 bar (see gure 3-1 detail “7”).
The safety valve drain must be conveyed to pipe “F” in
gure 5-4, which must be then taken to the anti-odour
siphon (detail “G”, gure 5-6). This drain with a siphon is
used to prevent overpressures if the valve is opened, and it
allows the user to check intervention.
The anti-odour siphon “G” in gure 5-6 is provided on
request.
WARNING! If the safety valve is not connected
to the drain, whenever the valve intervenes, it could
cause damage to persons, animals or objects.
16
COSMOGAS
Page 17
5 - INSTALLATION
020002.01.004
5.11 - Hydraulic and gas connections,
and mounting of the lower cover
The boiler is provided with the ttings illustrated in gure
5-5 as standard, where:
A = central heating supply
Ø 18 in the 15 and 24 models
Ø 22 in the 34 model
B = domestic hot water Ø 14 (absent in the “B” and ”C” models)
C = 3/4" gas inlet cock (EN 331 type-approved)
D = 1/2" domestic cold water inlet cock
E = gas Ø 18
F = domestic cold water Ø 14
G = central heating return
Ø 18 in the 15 and 24 models
Ø 22 in the 34 model
G
Once the hydraulic and gas connections have been made,
proceed with assembly of the lower cover “H” as indicated
in gure 5-5.
C DH
Figure 5-5 – Water and gas connections
EBA F
Connections of pipes “A” and “G” on model 34 are 1” size,
however, at option of the installer the “A” adaptor can be
removed, changing the connection for 3/4”.
Couplings and raccords “A”, “B”, “C”, “D”, “E”, “F”, “G”, in
some models could be not supplied by factory.
min10 mm
max 30 mm
020002.01.028
Figure 5-6 – Siphon funnel (on request)
COSMOGAS
F
G
17
MYDENS
Page 18
5 - INSTALLATION
020002.01.007
5.12 - Hydraulic connections
for model -- B boiler
The “B” version of the boiler must be connected to coil-type
indirect water heater for the production of domestic hot
water (see also section 5.16).
To do this, ttings have been set-up for connection to the
indirect water heater. Prepare as follows (refer to gure
5-7):
1.- t the reducer “A”;
2.- t the ducts “B” and “C”;
Make sure that every coupling has its own gasket.
A
B
C
A = reducer tting
B = supply to indirect water heater coil
C = return from indirect water heater coil
Figure 5-7 – Hydraulic connections for boiler with
indirect water heater with coil
020002.01.008
A
B
A
Couplings and raccords “A”, “B” and “C” in some models
could be not supplied by factory.
5.13 - Polyphosphate
softener (on request)
If the boiler is installed in a geographical area where domestic
hot water has hardness exceeding 25°F (250 mg/l), a
polyphosphate softener must be installed on the cold water
supply (see gure 5-8, detail “B”), in order to safeguard the
appliance against limescale deposits.
Proceed as follows for installation (refer to gure 5-8):
1.- Connect the softener “B” to the cock “A”;
2.- Mount the cock “A” on the boiler tting;
3.- Proceed with the installation of the cold water inlet pipe
on the tting behind the softener “B”;
4.- Before retting the lower cover, trim the entire part
between walls “C” and “D”, from the outer edge to the
central slot (only in the rear part), to allow the softener
“B” to be housed.
B
C
Figure 5-8 – Polyphosphate softener
(on request)
MYDENS
D
18
COSMOGAS
Page 19
5 - INSTALLATION
5.14 - Electrical connections: details
WARNING! The appliance is only electrically
safe when it has been correctly connected to an
efcient earth circuit, performed as provided for by the
current safety regulations.
This fundamental safety requirement must be met. If in
doubt, request a thorough check of the electrical system by
a professionally qualied technician.
Have a professionally qualied technician check that
the electrical system is suitable for the electric power
required by the appliance, as indicated on the plate.
The use of adapters, multiplugs, extension leads, etc. is
not permitted.
The appliance must be connected to the mains electricity
using a three-polar electric cable, with double isolation,
a minimum section of 1.5 mm² and resistance to a
minimum temperature of 70°C.
For connection to mains electricity, a bipolar switch must
be installed near the appliance with a contact opening
distance of at least 3 mm, as envisioned by the current
sector regulations.
Respect the polarity between the neutral and phase
wires when connecting the appliance.
Make sure that the water system and heating pipes
are not used as earth points for the electrical system
or telephone lines. This piping is not suitable for this
purpose; serious corrosion damage would occur in a very
short time to the appliance, piping and radiators.
WARNING! The boiler is not protected against
the effects caused by lightening.
Figure 5-9 key
C
C
020025.01.009
21 20 19 18 17 16 15 14 13 12 11 10 9 8
AL
CH
Slave
AD TA SE0-10 SB MF EP D N C
62408190
A = Control panel box;
B = Electrical connections board cover;
C = Connections cover closing aps;
D = Electrical connections board
C
Electrical contacts key
B
AL Slave = Slave appliance BUS;
CH = Cascade probe;
AD = Master appliance BUS;
D
TA = Room thermostat/ chronothermostat/ CR04 remote time
control/ Cosmobit
0-10 = 0-10 VDC communication;
SE = External sensor (where present);
SB = Indirect water heater sensor (where present);
MF = Alarm output/ Automatic ll;
EP = External pump (where present);
DNC = External diverter valve (where present) (D = Domestic
hot water line; N = Neutral; C = Heating line)
L1 = Boiler power supply line
A
N = Boiler power supply neutral
EARTH SYMBOL = Earth contacts
6 5 4 3 2 17
L1
N
020002.01.010
Figure 5-9 – Electrical connections
COSMOGAS
19
MYDENS
Page 20
5 - INSTALLATION
5.14.1 - Connecting the power supply
cable
Proceed as follows to connect the power supply cable (refer
to gure 5-9):
1.- Use a triple-pole dual-insulation cable, with a minimum
cross-section of 1.5 mm2;
2.- Remove the casing from the appliance, following the
relevant instructions in section 8.3;
3.- Rotate panel “A” towards the front of the boiler;
4.- Use the aps “C” and open the lid “B” as indicated by
the arrow;
5.- Lay the power supply cable through the fairlead near the
contacts “L1”, “N” and the earth symbol;
6.- Strip the cable, making sure that the earth wire (yellow/
green) is kept 20 mm longer than the other two;
7.- Connect the yellow/green cable to the earth terminal
(see symbol);
8.- Connect the brown cable (Phase) to terminal L1;
9.- Connect the blue cable (Neutral) to terminal N.
5.14.2 – Choosing the room thermostat/
chronothermostat
The boiler is set up to operate with any room thermostat
or chronothermostat which has the contact to which the
cables from the boiler can be connected, with the following
features:
- open/closed (ON/OFF);
- potential-free (not powered);
- closing, when there is a request for heat;
- 24VAC, 1A.
Figure 5-10 – Correct positioning of the room
thermostat/ chronothermostat
M a x i m u m
s u p p l y
temperature
(Par. 2111)
M i n i m u m
s u p p l y
temperature
(Par. 2110)
1.0 1.5
OFF ON
ON/OFF
hysteresis
2 3 4 5 6 7 8 9
10
Figure 5-11 – Operating rules for 0-10 VDC analogue input
MYDENS
20
COSMOGAS
Page 21
5 - INSTALLATION
5.14.3 - Connecting the room thermostat/
chronothermostat
Install the room thermostat in a place in the house where
the temperature is the most characteristic of the home
and, however, in an area that is not subjected to repeated
temperature changes, away from windows or doors which
open directly to the outside (see gure 5-10).
Proceed as follows to connect the room thermostat cable
(refer to gure 5-9):
1.- Use a bipolar cable, with a minimum cross-section of
1.5 mm2, from the appliance to the room thermostat/
chronothermostat; The maximum length allowed is
20 metres. For lengths exceeding 100 metres, use a
shielded cable with shield earthing;
2.- Remove the casing from the appliance, following the
relevant instructions in section 8.3;
3.- Lay the electric cable through the fairlead near the “TA”
contacts;
4.- Use a free fairlead, not used by other wires;
5.- Strip the cable;
6.- Connect the two ends of the cable to the “TA” clamps
(see gure 5-9).
WA R N I N G ! A s t h e r o o m t h e r m o s t a t /
chronothermostat cables are subjected to a very low
safety voltage (24 VDC), they must ow in wires different
from the 230 VAC power supplies.
5.14.4 - CR04 remote time control (on
request)
The CR04 remote time control, is a room thermostat
capable of interacting with the boiler, adjusting the room
temperature in a modulating manner and not by steps. This
device is a real heat regulator capable of operating with the
outside temperature sensor and, therefore, of adjusting the
room temperature in an optimum manner.
Install the CR04 remote control in a place in the house
where the temperature is the most characteristic of the
home and, however, in an area that is not subjected to
repeated temperature changes, away from windows or
doors which open directly to the outside (see gure 5-10).
In order to connect the remote control, proceed as follows
(refer to gure 5-9):
Use a bipolar cable, with a minimum cross-section of 1.5
mm2, from the appliance to the CR04 remote control;
The cable must also be shielded. The shield must be
connected to the earth from the side of the appliance.
The maximum length permitted is 100 metres;
remove the casing and access the junction box (see
section 8.3);
connect the two cable ends to the boiler terminals “14”
and “15” (see gure 5-9 “TA”).
connect the other two ends of the cable to the terminals
on the remote control (follow the instructions in the CR04
manual).
5.14.5 - Installing the external temperature
sensor (on request)
Install the external temperature sensor outside the building on
a wall facing NORTH or NORTH-EAST, at a height of between
2 metres and 2.5 metres from the ground. For buildings
with several oors, it must be installed at about half way up
the second oor. Do not install it above windows, doors or
ventilation outlets or directly below balconies or gutters. Do
not plaster over the external temperature sensor. Do not install
the sensor on walls without eaves, i.e. where not protected
from rain.
Where the sensor is installed on a wall that has yet to be
plastered, it must be installed with a suitable thickness or be
removed before plastering.
Proceed as follows to connect the external temperature
sensor cable:
1.- Lay a bipolar electric cable with a minimum cross-section
of 1.5 mm², which goes from the boiler to the external
temperature sensor. The maximum length allowed is 20
metres. For other lengths up to 100 metres, use a shielded
cable with shield earthing.
WARNING! As the cables are subjected to a very
low safety voltage (24 VDC), they must ow in wires
different from the 230 VAC power supplies.
2.- Connect the bipolar cable to the “SE” clamps in gure
5-9;
3.- Connect the bipolar cable to the ends of the external
temperature sensor.
Set the boiler to learn from the external temperature sensor
as follows:
1.- Access the “Installer” prole as detailed in section 7.16;
2.- Set parameter
according to the type of climatic adjustment desired (see
section 7.10);
To conrm that the external sensor has been enabled, the
icon shows on the display.
Proceed with the steps given in section 7.10.3 to set the correct
adjustment values for the supply temperature, according to
the external temperature.
2001 to 1 or 2 (see section 7.16)
5.14.6 - 0-10 VDC type dialogue
The appliance be controlled via 0-10 VDC dialogue by
proceeding as follows:
1.- Access the “Installer” prole as detailed in section 7.16
and set parameter 2001 = 4;
2.- Now the boiler can be controlled via the 0-10 VDC signal
according to the rules shown in gure 5-11;
Opening the TA contact has priority over the 0-10 V
signal.
WARNING!
As the CR04 remote control cables are subjected to a
very low safety voltage (24 VDC), they must ow in wires
different from the 230 VAC power supplies.
Once the CR04 remote control has been connected, all the
room temperature adjustments and domestic hot water
temperature operations must be carried out directly on
the remote control. Remember to follow the instructions
in the CR04 remote control manual carefully.
COSMOGAS
5.14.7 - Alarm contact
The alarm contact closes whenever the appliance shows an
error or locks.
21
MYDENS
Page 22
5 - INSTALLATION
5.15 - Connecting appliances in a cascade
This appliance can be connected in a cascade including up to
a maximum of 8 devices. The hydraulic connection diagram
is shown in gure 5-12. Other types of hydraulic connections
can be performed (ask the manufacturer for the reference
diagrams). The cascade is managed by the motherboard in
the device that will be dened here and then referred to as the
“Master”. To connect the appliances in a cascade, proceed
as follows:
1 - Set up the hydraulic installation as shown in gure 5-12;
2 - Set up the electrical installation as shown in gure 5-13;
3 - Access the appliance where the cascade probe has been
connected; this will be the one closest to the hydraulic separator.
Set parameter 4184 = 1 (logical address of the communication
bus) and set parameter 4147 to the total number of appliances
installed in the cascade (including the “Master”);
SLAVE
appliance
#4 to #8
Check
valve
A-LINK A-LINK A-LINK
SLAVE
appliance
#3
Check
valve
SLAVE
appliance
#2
4 - On the “Master” unit, check that switch “S4” is in the ON
position (see gure 5-13);
5 - Access the next appliance which will become the rst
“Slave” and set parameter 4184 = 2 (logical address of the
communication bus). Make sure that parameter 2001 is “0”;
6 - On the “Slave” unit, move switch “S4” to the OFF position
(see gure 5-13);
7 - Access each of the following appliances, repeating the
instructions in points 5 and 6 above. Parameter 4184 must be
increased by one unit for each additional appliance.
When the slave appliance is correctly connected to the
master, the radiator symbol (“E”, gure 7-1) disappears
from the display.
Check
valve
MASTER
appliance
Check
valve
General
cascade
sensor
#1
Figure 5-12 – Concept diagram: connecting appliances in a cascade
SLAVE
appliance
4184 = 2
2001 = 0
* = Number of
appliances
Sensor
A-LINK
To the next
appliance
cascade
MASTER
appliance
4184 = 1
4147 = *
Hydraulic
separator
Central
heating circuit
pump
The S4
switch is
located
here
Figure 5-13 – Wiring diagram for appliances in a cascade
MYDENS
22
COSMOGAS
Page 23
5 - INSTALLATION
5.16 - Connecting the boiler to
indirect water heater with coil
Only the MYDENS -- B model boilers can be connected
to an indirect water heater with coil.
The hydraulic connections must be made as per gure 5-14
(see also section 5.12).
Proceed as follows for the electric connections (refer to
gure 5-9):
1.- Disconnect the electric power supply from the appliance;
2.- Lay a bipolar electric cable with a minimum cross-section
of 1.5 mm², which goes from the appliance to the indirect
water heater temperature sensor and connect it to the boiler
on clamps “8” and “9” (SB);
3.- Connect the other end of the cable to the indirect water
heater temperature sensor;
4.- Insert the temperature sensor probe inside the indirect
water heater sample point (see gure 5-14, detail “14”).
5. - Set parameter 2035 to 1;
6.- Set parameter 2038 to 10;
The MYDENS -- C model boiler can be connected to an
indirect water heater with coil also after installation. In
this case, a diverter valve must be installed external to
the appliance.
1 - Appliance model -- B
2 3 4 Gas supply
5 -
6 Filling the central heating system (installer’s duty)
7 Generic indirect water heater with coil
8 Domestic hot water outlet
9 Cold water inlet
10 Supply and return for indirect water heater lling
11 Hydraulic safety unit (installer’s duty)
12 Supply to the central heating system
13 Return from the central heating system
14 Indirect water heater temperature probe (standard for
mod. “B” only)
The temperature of the water stored inside the indirect
water heater can be selected by the user from a range of
between 40°C and 60°C.
WARNING! A hot water temperature level
exceeding 51°C may cause permanent injury/damage to
persons, animals and objects.
In particular, protect children, the elderly and people
with disabilities against any possible risks of scalds,
by inserting devices that limit the usage temperature of
the DHW to users.
5.16.1 - Anti-legionella
If the boiler is connected to an indirect water heater for
the preparation of domestic hot water, a disinfection cycle
is used against legionella bacteria. This cycle involves
bringing the indirect water heater to 60°C (temperature
at which the legionella bacteria dies), 2 hours after the
appliance was connected to the power supply and at least
every week. It is for this reason that the water may (at
certain times) reach the utilities at a higher temperature
than that set with the relevant command.
WARNING! A hot water temperature level
exceeding 51°C may cause permanent injury/damage to
persons, animals and objects.
In particular, protect children, the elderly and people
with disabilities against any possible risks of scalds,
by inserting devices that limit the usage temperature of
the DHW to users.
Figure 5-14 – Hydraulic connection to indirect
water heater with coil
COSMOGAS
23
MYDENS
Page 24
5 - INSTALLATION
5.17 - Burned gas exhaust and
combustion agent air intake pipe
WARNING! To connect the burned gas exhaust
and combustion agent air intake, the relevant national
and local regulations must be respected.
WARNING! The fumes from this appliance can
reach 90°C in certain conditions. Therefore, use pipes
in plastic that can resist high temperatures.
WARNING! This appliance is a “condensing”
boiler. Use AISI 316L stainless steel materials or
polypropylene plastic materials to make the fumes
exhaust so as to prevent corrosion due to the acidity of
the condensate.
Please remember that appliances of this type must have
exhaust and intake pipes supplied by the manufacturer of
the appliance itself.
Other types of pipes, if used, must be type-approved for this
intended use.
The types of exhaust for which the appliance is approved
are given in the technical features table at the end of the
manual under the “type” heading and on the data plate on
the boiler, also under the “type” heading.
The symbols used to dene the type of exhaust are given
below:
- B23 and B23P, separated with intake in room and exhaust
through wall or roof.
WARNING! If the appliance is installed with a B23
or B23P exhaust, it will take in air for combustion from the
surrounding environment. Therefore, all precautions must
be taken regarding ventilation of the rooms as prescribed
by the national and/or local regulations.
- C13, coaxial in vertical wall
- C33, coaxial at the roof
- C43, separated with exhaust in ue, combined with intake
in common channel.
WARNING! The appliances installed in type C43
must only be connected to natural-draught ues.
- C53, separated with exhaust on roof and intake on wall, or
in two potentially different pressure points.
- C63, the appliance can be tted to type-approved exhaust
and intake pipes made by other brands.
WARNING! With C43 and C63 exhausts, the
condensate coming from the chimney cannot be
conveyed into the boiler. The boiler cannot have the
air intake and fumes exhaust on opposite walls of the
building.
- C83, separated with wall intake or another point
independent from the intakes of other appliances, and
ue exhaust.
- C93, separated with exhaust on roof and intake in preexisting channel.
Figure 5-15 – Exhaust/intake systems
MYDENS
24
COSMOGAS
Page 25
5 - INSTALLATION
During operation, especially in winter, it is possible that
white smoke may emerge from the boiler’s ue gas
outlet because of its high performance. This is a natural
phenomenon and is not a cause for concern. It is the water
vapour in the fumes which condensates when it comes in
contact with the outside air.
5.17.1 - Type of intake/exhaust B23 and
B23P
In the case of B23 and B23P type combustion agent air
intake/fumes exhaust systems, it is essential that the rooms
in which the appliances are installed have at least as much
air as is required for combustion and ventilation of the room.
It is therefore useful to remember that the combustion of 1 m³
of gas requires 11 cm³ of air.
The natural flow of air must take place directly through
permanent openings made in the outside walls of the room to
be ventilated. However, these must be away from sources of
pollution, such as vents of dubious origin, airborne industrial
exhausts, etc.
The ventilation openings must meet the following requirements:
cross-sections with net passage of at least 6 cm² for
every kW of heat input installed, with minimum of 100
cm²;
constructed in a way that the opening inlets both inside
and outside the wall cannot be blocked;
be protected, for example with grids, mesh, etc. The net
passage cross-section must not be reduced by these
systems;
be positioned at a height near to oor level and in such
a way as not to cause any problems with the operation
of the combustion product exhaust devices; where
this position is not possible, the cross-section of the
ventilation openings must be increased by at least 50%.
If the stale air is evacuated with the aid of a mechanical tool
(electric fan), the following conditions must be respected:
a) if there is a common exhaust pipe in the room that is not
in service, it must be capped;
b) the ventilation opening in the room in which the gas
appliance is installed must be increased, depending on the
maximum air ow rate required at the electric fan.
c) the action of the electric fan must not affect the correct
evacuation of the combustion products. Check all of the
above running a draught test. Run the fan or extractor
hood at its maximum power and the gas appliance at the
maximum and minimum power.
The air ow can also be obtained from an adjoining room
provided that:
it has direct ventilation, in compliance with the points above;
in the room to be ventilated, only appliances tted to
exhaust pipes are installed;
the adjacent room is not a bedroom;
the adjacent room is not a communal part of the building;
the adjacent room is not an environment with re hazards
such as hangars, garages, warehouses for combustible
materials, etc.;
the adjacent room does not have a negative pressure with
respect to the room to be ventilated due to reverse draught
(which can be caused by another appliance operating with
any type of fuel in the same room, or a replace or any
other intake device for which an adequate air intake has
not been provided for);
the ow of air from the adjacent room to the room to
be ventilated can take place freely through permanent
openings, with a total net cross-section not less than that
indicated at the start of this section.
In rooms where gas appliances are installed, it may become
necessary to evacuate stale air, as well as introducing
combustion agent air, the result being the release of an
additional equal amount of clean air.
COSMOGAS
25
MYDENS
Page 26
5 - INSTALLATION
C
D
A
B
020002.01.011
Figure 5-16 – Installation of the
“80/80PP Split” system
5.17.2 - “Split 80/80PP” system
(polypropylene) (type C43; C53; C83; C93)
The appliance is supplied as per standard without ttings
to connect the fumes exhaust/air intake. To connect the
boiler to a “80/80PP Split” system, the relevant kit must be
requested and must be installed as in gure 5-16.
Fitting “A” can rotate freely 360°, guaranteeing optimum
installation versatility.
In the fumes exhaust side, it is recommended to install
AISI 316L stainless steel or polypropylene pipes, which
are more resistant to the formation of condensate.
Take particular care with the installation of pipes in
the part that passes through the wall to the outside.
The normal maintenance operations must always be
possible; therefore, install the pipes in a sheath so that
they can be slid out.
The horizontal tracts must always have an inclination of
at least 2% towards the condensate drain device.
The boiler is already set up with a condensate collector,
which must be tted to a drain pipe (see section 5.9).
WARNING! This condensate drain is designed
to drain away all of the liquid produced by a single
appliance. If more than one boiler is installed, each
boiler should be provided with its own condensate
drain.
Figure 5-17 – Pre-installation centre-to-centre
distances
The fumes exhaust/air intake system can be extended up
to a maximum distance as indicated in section 9. Every 90°
bend has a loss equivalent to the value in section 9. Every
45° bend has a loss equivalent to the value in section 9.
WARNING! The fumes exhaust terminal must
be appropriately protected against the effects of the
wind (see also section 7.17.1 error Loc 22).
WARNING! Mechanically secure the joints
between the various component elements of the
exhaust and intake pipe, through the use of xing
systems or equivalent systems. See gure 5-18
WARNING! The temperature of the exhaust
pipe can reach 90°C during operation. If the pipe
passes through walls that are sensitive to these
temperatures, insert a protective heat-insulating
sheath.
WARNING! If the air intake and fumes exhaust
terminals are positioned on the same wall, they must
remain at a minimum distance of 1 metre.
Figure 5-18 – Fixing the exhaust and intake pipes
MYDENS
WARNING! The exhaust and intake pipes
must be appropriately sustained via rigid brackets
positioned no more than 1 metre from each other. The
brackets must be xed to rigid walls that can support
the weight of the pipe itself.
26
COSMOGAS
Page 27
5 - INSTALLATION
5.17.3 - “Split 80/80PP” system (type C43;
C53; C83; C93): accessories available
To make the “80/80PP split” fumes exhaust/air intake system,
we propose some of the most common accessories available;
remember that a wide range can be consulted in the relevant
catalogue:
(the number after the code refers to the piece in the diagrams
that follow)
62617306 - N° 10 PP coaxial roof terminal
62617244 - N° 12 M/F PP 90° bend
62617255 - N° 29 valley for pitched roofs
from 15° up to 25°
62617236 - N° 11 M/F PP extension
62617249 - N°18 PP anti-slip bands for extensions
62617240 - N° 14 M.F. PP L=20m hose
62617241 - N°16 spacer for hose
62617238 - N° 17 PP telescopic joint
62617242 - N° 15 PP T-tting
62617246 - N° 13 M/F PP 45° bend
62617306
COSMOGAS
27
MYDENS
Page 28
5 - INSTALLATION
5.17.4 - “Split 80/80PP” system (type C43;
C53; C83; C93): installation examples
In gure 5-19 two installation examples are given:
- exhaust in chimney with condensate collection inside the
boiler itself.
The horizontal part of the fumes exhaust side must be inclined
towards the boiler.
The intake must slope towards the outside to prevent rain
water entering.
- exhaust on the outside, directly via the boiler pipes with
condensate collection inside the boiler itself.
The intake must slope towards the outside to prevent rain
water entering.
Figure 5-19 – Example of “80/80 PP system”
installation
See gure 5-20 for a separated fumes exhaust set-up, where
the exhaust is made from a polypropylene hose for piping the
technical cells.
The condensate produced in the vertical pipe must all be
conveyed into the boiler.
The intake must slope towards the outside to prevent rain
water entering.
Figure 5-20 – Example of “80/80 PP system” installation
MYDENS
28
COSMOGAS
Page 29
5 - INSTALLATION
C
D
5.17.5 - “60/100PP vertical coaxial” system
(polypropylene) (type C13; C33)
The appliance is supplied as per standard without ttings to
connect the fumes exhaust/air intake. To connect the boiler
to a 60/100 vertical coaxial system, the relevant kit must be
requested and must be installed as in gure 5-21.
A
B
020002.01.012
Figure 5-21 – Installation of vertical coaxial system
WARNING! Scrupulously follow the installation
phases of the coaxial pipe as illustrated in gure 5-23.
In particular:
1.- Introduce coaxial pipe “C” inside the bend “A”;
2.- Fix the external pipe using the stainless steel self-threading
screws “B”.
WARNING! The coaxial exhaust and intake
pipes must be appropriately sustained via rigid
brackets positioned no more than 1 metre from each
other. The brackets must be xed to rigid walls that can
support the weight of the pipe itself.
WARNING! Once these operations have been
performed, check that the exhaust/intake terminal is
exposed to the outdoors with the tolerances given in
gure 5-27
Take particular care with the installation of pipes in the
part that passes through the wall to the outside. The
normal maintenance operations must always be possible;
therefore, install the pipes in a sheath so that they can be
slid out.
The horizontal tracts must always have an inclination of at
least 2% towards the boiler.
The fumes exhaust/air intake pipe can be extended up
to the maximum distance indicated in the table in section
9 at the end of the manual. Every 90° bend has a loss
equivalent to the value in section 9. Every 45° bend has a
loss equivalent to the value in section 9.
Figure 5-22 – Pre-installation centre-to-centre
distances
Figure 5-23 - Positioning the coaxial pipe
COSMOGAS
29
MYDENS
Page 30
5 - INSTALLATION
C
D
5.17.6 - “60/100PP horizontal coaxial”
system (polypropylene) (type C13; C33)
The appliance is supplied as per standard without ttings
to connect the fumes exhaust/air intake. To connect the
appliance to a 60/100 coaxial system, the relevant kit must
be requested and must be installed as in gure 5-24.
A
B
020002.01.013
Figure 5-24 – Installing the horizontal coaxial
system
WARNING! Scrupulously follow the installation
phases of the coaxial pipe as illustrated in gure 5-26.
In particular:
1. - Introduce coaxial pipe “C” inside bend “A”;
2. - Fix the external pipe using the stainless steel self-threading
screws “B”.
WARNING! The coaxial exhaust and intake
pipes must be appropriately sustained via rigid
brackets positioned no more than 1 metre from each
other. The brackets must be xed to rigid walls that can
support the weight of the pipe itself.
WARNING! Once these operations have been
performed, check that the exhaust/intake terminal is
exposed to the outdoors with the tolerances given in
gure 5-27
Take particular care with the installation of pipes in the
part that passes through the wall to the outside. The
normal maintenance operations must always be possible;
therefore, install the pipes in a sheath so that they can be
slid out.
The horizontal tracts must always have an inclination of at
least 2% towards the boiler.
The fumes exhaust/air intake pipe can be extended up
to the maximum distance indicated in the table in section
9 at the end of the manual. Every 90° bend has a loss
equivalent to the value in section 9. Every 45° bend has a
loss equivalent to the value in section 9.
Figure 5-25 – Pre-installation centre-to-centre
distances
Figure 5-26 – Positioning the coaxial pipe
MYDENS
30
COSMOGAS
Page 31
5 - INSTALLATION
5.17.7 - “60/100PP coaxial” system:
accessories available
The following accessories are available on request to make
the 60/100 coaxial fumes exhaust/air intake system:
(the number after the code refers to the piece in the diagrams
that follow)
62617255 - N° 2 valley for pitched roofs from 5° to 25°
extension L = 1000 mm
62617234 - N° 1 M/F PP 90° coaxial bend
62617252 - N° 6 M/F PP 45° coaxial bend
62617231 - N° 7 L 1m PP coaxial extension
62617304 - N° 3 PP coaxial roof terminal
62617232 - N° 5 PP coaxial wall terminal
COSMOGAS
31
MYDENS
Page 32
5 - INSTALLATION
5.17.8 - “60/100PP coaxial” system:
installation examples
When setting up a coaxial exhaust (see gure 5-27), whether
vertical and horizontal, the exhaust pipe must slope upwards
so that the condensate ows into the boiler.
Figure 5-27 – Examples of coaxial pipe installation
MYDENS
32
COSMOGAS
Page 33
5 - INSTALLATION
5 - INSTALLATION
E
E
D
C
C
B
B
A
A
62403659_021
5.17.9 - “80PP single” system
(polypropylene) (type B23 or B23P)
WARNING! The appliance with this exhaust kit
sucks the combustion air from the room where it is
installed. Read and follow the precautions set out in
section 5.17.1.
The appliance is supplied as standard without ttings to
connect the fumes exhaust. To connect the appliance to a
“80PP single” system, the relevant kit must be requested
and must be installed as in gure 5-28, as follows:
1 - Rest tting “B” on tting “A”.
2 - Fit xing plate “C” on tting “B”.
2 - Fasten xing plate “C” on tting “a” using the screws “D”.
3- Fit the reducer “E” as shown in the gure.
Take particular care with the installation of pipes in the
part that passes through the wall to the outside. The
normal maintenance operations must always be possible;
therefore, install the pipes in a sheath so that they can be
slid out.
The horizontal tracts must always have an inclination of
at least 2% towards the condensate drain device.
The boiler is already set up with a condensate collector,
which must be tted to a drain pipe (see section 5.9).
Figure 5-28 – Installing the single system
Figure 5-29 – Pre-installation centre-to-centre
distances
WARNING! This condensate drain is designed
to drain away all of the liquid produced by a single
appliance. If more than one boiler is installed, each
boiler should have its own condensate drain.
The fumes exhaust system can be extended up to a
maximum distance as indicated in section 9. Every 90°
bend has a loss equivalent to the value in section 9. Every
45° bend has a loss equivalent to the value in section 9.
WARNING! The fumes exhaust terminal must be
appropriately protected against the effects of the wind
(see also section 7.17.1 error Loc 22).
WARNING! Mechanically secure the joints
between the various component elements of the
exhaust pipe, using xing systems or similar. See
gure 5-30
WARNING! The temperature of the exhaust pipe
can reach 90°C during operation. If the pipe passes
through walls that are sensitive to these temperatures,
insert a protective heat-insulating sheath.
WARNING! The exhaust pipes must be
appropriately sustained via rigid brackets positioned
no more than 1 metre from each other. The brackets
must be xed to rigid walls that can support the weight
of the pipe itself.
Figure 5-30 – Fixing the exhaust and intake pipes
COSMOGAS
33
MYDENS
Page 34
5 - INSTALLATION
62403659_001
62403659_002
62403659_004
62403659_005
62403659_003
B
Figure 5-31
A
5.17.10 - “80PP single” system:
accessories available
The accessories in section 5.17.3 are available on request to
set up an “80PP single” fumes exhaust system.
A
5.18 - Installing and uninstalling the
MYDENS external cover kit (on request)
To fasten the external cover, follow the instructions below:
1 - Position upper xing bracket “A” and the centring template
“B” on the wall, as shown in gures 5-31 and 5-32.
2 - Mark holes “G”, “H” and “L”, “M” using a pencil as shown
in gures 5-33 and 5-34;
3 - Remove the template and xing bracket, and drill the holes
marked out previously, as shown in gures 5-35 and 5-36;
4 - Fasten upper xing bracket “A” to the wall, using the dowels
supplied in the kit, as shown in gure 5-37;
5 - Remove pre-cut disc “R” from xing bracket “N”, as shown
in gure 5-38;
6 - Fasten xing bracket “N” to the wall, insert gas pipe “P”
inside it and connect the various components as shown in
gures 5-39 and 5-40;
7 - Apply the cover as shown in gures 5-41, 5-42 and 5-43
in sequence, making sure that the hooks “C”, in the cover
frame, are anchored to the upper xing bracket “A” as shown
in gure 5-44;
8 - Lock the cover using clamping screw “E”, as shown in
gure 5-45;
9-Apply the Rainproof gasket “D” on the cover “Q” as shown
in gure 5-46;
B
Figure 5-32
WARNING!
- If the appliance is equipped with a fumes discharge
terminal, remove the area marked “F” (which can be
identied using a pre-cut piece on the lower surface)
from the gasket “D” with a cutter (g. 5-47).
L
M
Figure 5-34
L
M
Figure 5-33
MYDENS
HG
Figure 5-35
34
COSMOGAS
Page 35
62403659_006
62403659_007
62403659_009
62403659_008
62403659_019
62403659_010
62403659_011
62403659_012
5 - INSTALLATION
H
G
Figure 5-36
N
M
L
Figure 5-37
A
Figure 5-38
R
G
Figure 5-39
Q
H
N
P
P
N
Figure 5-40
Q
Q
Figure 5-41
COSMOGAS
Figure 5-42 Figure 5-43
35
MYDENS
Page 36
62403659_014
62403659_015_b
62403659_016
62403659_015_a
62403659_020
5 - INSTALLATION
C
- If the appliance is equipped with a single fumes
discharge terminal, remove the areas marked “U” from
the gasket “D” with a cutter (g. 5-47).
To remove the external cover, follow the instructions below:
A
62403659_018
Figure 5-44
D
Figure 5-46
62403659_013
Figure 5-45
D
E
1 - Remove the xing screw “E” in gure 5-45;
2 - Press on the areas marked with an arrow in gure 5-48;
this takes you from the position in gure 5-49 showing two
triangular points “S” and “T”, to the position in gure 5-50;
3 - Turn and lift the cover as shown in gure 5-51, remembering
to remove frame hooks “C” from the upper support bracket
“A” as illustrated in gure 5-44.
Q
S
T
Figure 5-49
62403659_022
F
Figure 5-47
U
Figure 5-50
Figure 5-48
MYDENS
Figure 5-51
36
COSMOGAS
Page 37
6 - START-UP
6.1 - Start-up
Before starting up the boiler, the following operations must
be carried out.
6.1.1 - Instructions to the user
Instruct the user on correct use of the boiler and the whole
system in general. In particular:
Hand over the installation and use manual and all the
documentation contained in the package to the user.
Instruct the user on any special measures for
discharging burned gases, informing them that they must
not be modied.
Inform the user of the water pressure check that needs
to be done on the system and the steps required to ll it
and vent the air.
Inform the user regarding the correct temperature,
control unit/room thermostat and radiator settings for
saving energy.
6.1.2 - Filling the condensate drain siphon
The siphon found inside the boiler (see gure 3-2, detail
“49”) must be lled with water to create the head capable of
preventing the fumes escaping from pipe “F” in gure 5-4.
Proceed as follows to do this:
(refer to gure 6-1)
1.- Loosen screw “E”;
2.- Remove lid “D” and gaskets “C”;
3.- Insert a rubber hose into opening “B” (do not confuse
with “A”) and the other end of the hose into the funnel;
4.- Use the funnel to slowly pour in about 200 cm³ of water
(= a glass);
5.- Ret all parts in reverse order.
WARNING! If the boiler remains off for more than
3 months, the siphon must be lled again as explained
above.
6.1.3 - Filling the central heating system
If the word FILL appears on the display when the boiler
is powered electrically, this means that the central heating
system must be lled. Proceed as follows:
only use clean water from the mains.
WARNING! The addition of chemical
substances such as anti-freeze must be performed in
compliance with the product instructions. In all cases,
these substances must not be introduced directly
inside the boiler.
1.- Open the ll cock positioned under the boiler (see gure
7-2 detail “A”) and ll the system at about 1.5 bar (the
word FILL disappears from the display);
2.- Make sure there are no water leaks from the ttings;
3.- Close the lling cock (see gure 7-2, detail “A”);
4.- Bleed the heating elements;
5.- Check the pressure on the boiler display again. If it has
dropped, ll up to 1.5 bar again.
WARNING! If there is an automatic load group,
no manual intervention is required to ll the system.
Figure 6-1 – Filling the condensate drain siphon
COSMOGAS
37
MYDENS
Page 38
6 - START-UP
6.2 - General recommendations
regarding the gas supply
To commission the boiler, have a professionally qualied
technician perform the following checks:
That the boiler is powered by the type of fuel for which it
is set-up.
That the gas supply pressure (with boiler operating and
stopped) is within the maximum and minimum values
indicated in the table in section 9 at the end of the
manual.
That the gas supply system is tted with all of the safety
and control parts required by current national and local
regulations.
That the fumes discharge terminal and the combustion
agent air intake terminal are free from any obstruction.
That the fumes exhaust and combustion agent air intake
terminal are positioned outside the building.
That the condensate drain connection is connected.
WARNING! If you smell gas:
A - Do not switch on any electric devices,
including telephones, or any object that can
cause sparks;
B - Immediately open doors and windows to create
a current of air that quickly cleans the gas from
the room;
C - From another room, or from a neighbour’s
property, immediately call a professionally
qualied technician or the gas supply company.
Call the Fire Service if the former are not
available.
6.3 - Type of gas for which
the appliance is set.
There is a label on the front of the appliance certifying the
gas supply type and pressure for which the boiler is set.
The boiler may have one of the following two types of
wording:
2H-G20-20mbar NATURAL GAS
This means that the boiler is set to operate with G20 gas
(methane) of group H of the second family, at a supply
pressure of 20 mbar.
3P-G31-37mbar LPG
This means that the boiler is set to operate with G31 gas
(propane, also known as LPG) of group P of the third family,
at a supply pressure of 37 mbar.
MYDENS
38
COSMOGAS
Page 39
6 - START-UP
6.4 - Conversion of the appliance
from one type of gas to another
B
A
020002.01.040
Figure 6-2 – Removing the air manifold
Q
P
N
O
M
C
changing the gas:
D
- The gas appliance must be installed, calibrated or
H
modied by specialised staff in compliance with the
law;
E
- Check and be certain that the type of gas which
F
is powering the appliance is compatible with the
G
adjustment kit in your possession;
- Do not supply the boiler with a type of gas other than
L
those specied.
Follow the instructions given below to change the gas:
1. - Access the “installer” prole (see section 7.16);
2. - Set parameter 2138 to the value shown in table on
gure 6-6;
3. - Turn off electricity to the boiler;
4. - Open the boiler casing as reported in section 8.3;
5. - Close the gas supply;
6. - Remove the air manifold, making sure to rotate it
outwards and then slide it out of the fan inlet (see gure
6-2, detail “C”);
7. - Remove the gas inlet pipe using the two ttings (see
gure 6-2, details “H” and “L”);
8. - Remove clamp spring “M” from seat “N” releasing valve
“P” (see gure 6-3);
9. - Slide gas valve “P” up and out;
10. - Replace gas nozzle “R” (see gure 6-4) with an
appropriate one according to gure 6-6 under “Gas
nozzle diameter”;
11. - Ret the gas valve (see gure 6-3, detail “P”), making
sure to reposition spring “M”;
12. - Ret the gas supply pipe via the two ttings (see gure
6-2, details “H” and “L”);
13. - Ret the air manifold (see gure 6-2, detail “C”);
14. - Open the gas cock;
15. - Check for any gas leaks using the relevant tools.
- Read these instructions carefully before
020002.01.041
Figure 6-3 – Removing the gas valve
NO
020022.01.008
020002.01.042
R
YES
Figure 6-4 – Replacing the gas nozzle
WARNING! Perform the gas leak test using a
soap and water solution only. The use of naked ames
is prohibited.
WARNING! If you smell gas:
A - Do not switch on any electric devices,
including telephones, or any object that can
cause sparks;
B - Immediately open doors and windows to create
a current of air that quickly cleans the gas from
the room;
C - From another room, or from a neighbour’s
property, immediately call a professionally
qualied technician or the gas supply company.
Call the Fire Service if the former are not
available.
COSMOGAS
39
MYDENS
Page 40
6 - START-UP
16.- Check the supply gas pressure, following the procedure
in section 6.6;
17.- Open the CO2 adjustment screw completely (see gure
6-9, detail “A”);
18.- Check and adjust the CO2, following the procedure in
section 6.7;
19.- Apply the sticker certifying the appliance’s new setting
onto the front casing of the boiler in place of the label
showing the old status (see gure 6-5): apply label “B” if
the boiler has been converted from natural gas to LPG;
apply label “A” if the boiler has been converted from LPG
to natural gas.
Figure 6-5 – Labels certifying the new boiler status
Model
15
24
34
Gas supply
minimum
pressure
(mbar)
Setting
Type
of gas
parameter
2138
G20 50 17 25 4.9 9.0 ±
G25 50 20 30 4.9 9.0 ± 0.3 8.5 ± 0.1 4.5 ± 0.2 5.4 ± 0.1
G30 51 25 35 3.55 10.4 ± 0.3 9.5 ± 0.1 5.4 ± 0.2 6.7 ± 0.1
G31 51 25 45 3.7 10.4 ± 0.3 10.0 ± 0.1 5.0 ± 0.2 5.6 ± 0.1
G20 50 17 25 4.9 9.0 ±
G25 50 20 30 4.9 9.0 ± 0.3 8.5 ± 0.1 4.5 ± 0.2 5.4 ± 0.1
G30 51 25 35 3.55 10.5 ± 0.3 9.5 ± 0.1 5.2 ± 0.2 6.7 ± 0.1
G31 51 25 45 3.7 10.5 ± 0.3 9.5 ± 0.1 4.9 ± 0.2 6.4 ± 0.1
G20 52 17 25 6.5 9.0 ±
G25 50 20 30 6.7 9.0 ± 0.3 8.5 ± 0.1 4.5 ± 0.2 5.4 ± 0.1
G30 53 25 35 4.5 10.5 ± 0.3 9.5 ± 0.1 5.2 ± 0.2 6.7 ± 0.1
G31 53 25 45 4.7 10.5 ± 0.3 10.0 ± 0.1 4.9 ± 0.2 5.6 ± 0.1
Gas supply
maximum
pressure
(mbar)
Gas nozzle
diameter
(mm)
CO2
Maximum
power
(%)
0.3 8.5 ± 0.1 4.9 ± 0.2 5.8 ± 0.1
0.3 8.5 ± 0.1 4.9 ± 0.2 5.8 ± 0.1
0.3 8.5 ± 0.1 4.9 ± 0.2 5.8 ± 0.1
CO2
Minimum
power
(%)
O2
Maximum
power
(%)
O2
Minimum
power
(%)
Figure 6-6 – Correspondence table for parameter 2138 and the operating values
MYDENS
40
COSMOGAS
Page 41
6 - START-UP
6.5 - Ignition
1.- Open the gas cock;
2.- Power the boiler electrically;
3.- Adjust the desired temperature from the heating service
using the
display shows the heating service operating status:
a)
b) ashing
4. - Adjust the desired temperature for the domestic hot water
service using the
on the display shows the DHW service operating status:
a) xed
b) ashing
5.- If the
pump may be blocked (see gure 3-1, detail “25”). Check
the condition of the pump and replace it if necessary;
6.- If the
up, bleed the air from the radiators again.
icon: central heating inactive (check that the room
thermostat is in call mode or, where there is an external
sensor, that the outdoor temperature is lower than the
heating stop spring temperature (par. 2025);
using domestic hot water, or where there is an indirect
water heater, the delivery temperature has been
reached);
icon ashes, but the radiators do not heat up, the
and keys. The icon on the
icon: central heating in operation.
and keys. The icon
icon: domestic hot water inactive (no-one is
icon: domestic hot water service in use.
icon ashes but the radiators still do not heat
6.6 - Controlling the supply gas
pressure and any adjustments
The gas supply pressure must correspond to that stated in
the table in section 9 at the end of the manual. Proceed as
follows to verify the pressure:
1.- Close the gas cock;
2.- Access the components inside the boiler, following the
procedure in section 8.3;
3.- Loosen pressure point “A” (see gure 6-7);
4.- Connect a manometer with a resolution of at least 0.1
mbar (1 mmH2O) to it;
5.- Open the gas cock;
6.- Check that the pressure does not exceed the value
given in the table in section 9 under “Gas supply
maximum pressure”;
7.- Make sure that any cocks and thermostatic valves after
the central heating circuit are open;
WARNING! When forcing the delivery
temperature, it automatically goes to 93°C to dispose
of as much of the heat generated by the boiler as
possible. Check that the central heating system can
support this temperature.
8.- Access the “installer” prole as detailed in section 7.16;
9.- Set parameter 0200 to HI;
10.- Now the burner will operate at maximum power for 10
minutes;
11.- Check that the pressure does not drop to a value lower
than the “Gas supply minimum pressure” given in the
table in section 9. If the supply pressure does not respect
the values described, operate on the system before the
appliance in order to bring it back to within the minimum
and maximum range;
12.- Once the check is complete, access the “installer”
020002.01.023
prole again and set parameter 0200 back to OFF;
13.- Close the pressure point “A” again as in gure 6-7;
14.- Check for any gas leaks at the pressure point using
suitable tools.
WARNING! Perform the gas leak test using a
soap and water solution only. The use of naked ames
is prohibited.
A
A - Gas inlet pressure point.
Figure 6-7 – Gas valve
COSMOGAS
41
MYDENS
Page 42
6 - START-UP
6.7 - Controlling the level of
CO2 and any adjustments
The boiler in normal operating mode, and for altitudes up to
1000 m, has a level of CO2 (carbon dioxide) in the fumes as
shown in the table in section 9. A combustion analysis must
be performed to check and adjust the CO2 level as required.
Proceed as follows
1.- Start up the boiler;
2.- Connect a combustion analyser to the appropriate point
on the fumes exhaust tting “B” in gure 6-8;
3.- Make sure that any cocks and thermostatic valves after
the central heating circuit are open;
WARNING! When forcing the delivery
temperature, it automatically goes to 93°C to dispose
of as much of the heat generated by the boiler as
possible. Check that the central heating system can
support this temperature.
4.- Access the “installer” prole as detailed in section 7.16;
5.- Set parameter 0200 to HI;
6.- Now the burner will operate at maximum power for 10
minutes;
7.- Wait for the CO2 measurement to stabilise;
8.- Compare the value measured with that given in the
table in gure 6-6, “CO2 maximum power”. If the value
measured differs from the value read, it must be brought
back to within the value given in the table in gure 6-6,
proceeding as follows:
a) Turn screw “A” clockwise as in gure 6-9 to decrease
the level of CO2;
b) Turn screw “A” anti-clockwise as in gure 6-9 to increase
the level of CO2;
9.- Once the check has been completed, seal the screw “A”
in gure 6-9 with red paint or a similar method;
10.- Access the “installer” prole again as detailed in
:
section 7.16 and set 0200 to Lo;
11.- Now the burner will operate at minimum power for 10
minutes;
12.- Wait for the CO2 measurement to stabilise;
13.- Compare the value measured with that given in the
table in gure 6-6, “CO2 minimum power”.
If the value measured differs from the value read, it must
be brought back to within the value given in the table in
gure 6-6, proceeding as follows:
a) Turn screw “B” anti-clockwise as in gure 6-9 to decrease
the level of CO2;
b) Turn screw “B” clockwise as in gure 6-9 to increase
the level of CO2;
14.- Once the check has been completed, seal screw “B” in
gure 6-9 with red paint or a similar method;
15.- Access the “installer” prole again as detailed in
section 7.16 and set parameter 0200 to OFF;
MYDENS
42
COSMOGAS
Page 43
6 - START-UP
A
WARNING! If during forcing, the power supplied
by the boiler is much higher than the power absorbed
by the system, the boiler switches off continuously
to reach the maximum temperature allowed (93°C).
To resolve this problem, set the heating power to
the value effectively required by the system, as laid
down in section 6.8, and run the CO2 analysis test or
020002.01.015
B
C
D
combustion efciency test, setting parameter
previously referred to at the
rEg value.
E
0200
Figure 6-8 – Combustion analysis points
A
B
020002.01.045
A - CO2 adjustment screw at maximum power;
B - CO2 adjustment screw at minimum power;
Figure 6-9 – Gas valve
COSMOGAS
43
MYDENS
Page 44
6 - START-UP
BOILER MODEL
Power
necessary
15 24 34
(kW)
32
31 94
29 88
27 82
25 98 76
23 89 70
21 80 64
19 71 58
17 62 52
15 53 46
13 44 44 40
11 35 35 34
9 26 26 28
7 17 17 22
5 8 8 16
Figure 6-10 – Corresponding values to enter under
parameter
necessary in central heating mode
2014 to obtain the desired power
6.8 - Adjusting the power in central
heating mode (Range Rated)
This appliance is designed and type-approved to adapt the
maximum heating power to the effective power needed by
the system, as per the calculation. To do this and to make
use of the boiler’s full potential, it is recommended to set the
maximum power in central heating mode at the effective value
required by the system. Proceed as follows:
1.- Access the “installer” prole as detailed in section 7.16;
2.- Set parameter 2014 as shown in the table in gure
6-10;
6.9 - Adjusting the domestic
hot water ow rate
The boiler is supplied with a domestic hot water maximum
ow rate adjuster. However, if the boiler is installed in a
geographical area where the temperature of the cold water
is very low, the ow rate of domestic hot water that passes
inside the boiler may have to be reduced.
It is therefore good practice to perform the following
adjustment:
1.- Switch the boiler on;
2.- Using the
temperature of the domestic hot water to 48°C-50°C;
3.- Open the hot water cock completely. In the case of a
single lever mixer tap, the position must be completely
on “HOT”;
4.- Wait 3 minutes for the temperature to stabilise;
5 - If the water temperature is too cold, the ow rate must
be reduced using selector “A” in gure 6-11, until the
desired temperature is reached.
and keys, adjust the
020002.01.016
A
Figure 6-11 – Domestic hot water ow rate selector
switch
MYDENS
44
COSMOGAS
Page 45
7 - USE
Figure 7-1 – Control board
Figure 7-1 key
A - Key for reducing the central heating temperature (below
the minimum, the central heating is set to OFF)
B - Reset key
C - Key for switching on and increasing the heating
temperature
D - Burner status (the burner is on when this icon is
showing)
E - Heating service status:
Icon off = Central heating off
Icon on = Central heating active but not in operation
Icon
F - Domestic hot water service status:
Icon off = Domestic hot water off
Icon on = Domestic hot water active but not in operation
Icon
G - Icon to enter the “installer” menu
H - Unit of measurement of the pressure displayed
L - Cascade pump status (if the icon is showing, the pump
M - Central heating system pressure (if ashing, pressure is
N - Temperature of the central heating or domestic hot
O - Unit of measurement of the temperature displayed
P - Central heating service adjusted by the external sensor
Q - Boiler in lockout (see sections 7.17.1 and 7.17.2 for the
R - Key for switching on and increasing the temperature
S - Key for reducing the temperature of the domestic hot
T - On/off switch
U - Appliance in anti-freeze mode
ashing = Central heating active and in operation
ashing =
is on)
low) or indicator of parameters in the various menus
water or indicator of the values assumed by the various
parameters
diagnostics)
of the domestic hot water or for scrolling through and
changing the value of the parameters
water (below the minimum, the domestic hot water is set
to OFF) or for scrolling through and changing the value
of the parameters
Domestic hot water
active and in operation
7.1 - Checking the cock opening
- The gas cock must be open;
- Any valves on the supply and return must be open;
- Any valves on the hot and cold water lines must be open.
7.2 - Checking the central
heating system pressure
If the pressure inside the central heating circuit drops below
0.8 bar, the display “N” in gure 7-1 shows the message
FILL to indicate that the correct pressure must be
restored. Proceed as follows:
1.- Pull the knob “A” in gure 7-2 downwards;
2.- Open the ll cock, turning the knob anti-clockwise to ll
the system;
3.- Check the pressure on the display “M” in gure 7-1; it
must reach a pressure of 1.3 bar - 1.5 bar (the FILL
message disappears on exceeding 1.1 bar);
4.- Close the ll cock (see knob “A” in gure 7-2), turning it
clockwise.
In some boiler models the system ll knob “A” in gure 7-2
may be absent. In these cases, use the device provided by
the installer in the system before the boiler itself.
WARNING! During normal operation, ll cock
“A” (see gure 7-2) must always remain in the closed
position.
If the pressure drops over time, restore the correct value.
This operation may have to be repeated several times in
the rst month of operation to remove any air bubbles in the
system.
COSMOGAS
45
MYDENS
Page 46
7 - USE
7.3 - Generali information
During operation, the display shows the boiler operating
status as well as other information as indicated in section
7.17 (Diagnostics).
Other parameters can be consulted through the “user
prole” (see section 7.15), useful for understanding
appliance operation and checking the most recent lockouts
or errors.
7.4 - Ignition procedure
1.- Open the gas cock;
2.- Power the boiler electrically;
3.- Adjust the domestic hot water temperature and the
central heating temperature as per sections 7.7 and 7.8
respectively.
The command and control equipment will switch the burner on.
If ignition does not take place within 20 seconds, the boiler
automatically attempts ignition again up to 3 times, after
which, if it still does not ignite, it locks out and the display
shows “Loc 1”.
Press and hold the RESET button until rSt appears on
the display, then release the RESET button and wait for the
normal operating conditions to resume.
The boiler will automatically attempt to ignite again.
NOTE: If, when pressing the RESET button, the display
7.5 - Summer operating mode
Whenever the central heating function is to be stopped for
a long period of time, leaving only the domestic hot water
function operating, adjust the central heating temperature
to the minimum using the
message “
0FF” appears.
or keys, until the
7.6 - Winter operating mode
In winter operating mode, the boiler sends the water to the
system via the pump at the temperature set using the
or
When the temperature inside the boiler approaches the
temperature set, the burner starts to modulate the ame
to reduce the power to the effective power required by the
system. If the temperature starts to rise further, the burner
stops.
At the same time, the pump that sends water to the system
is switched on and off by the room thermostat. This can be
noted because the
on, while it remains on when the pump is off.
The pump may initially make a noise. This is due to the
presence of residual air in the hydraulic system, which will
disappear quickly, without any intervention.
For a sustainable use of the boiler, it is recommended to keep
keys.
indicator ashes when the pump is
changes, press the
display. Then press the RESET key, taking care to hold it down
until the message “rSt“ shows on the display.
WARNING! If shutdown due to lockout occurs
frequently, contact a qualified technician to restore
normal operating conditions.
Once the boiler has been ignited correctly, it will continue to
operate for the service requested.
key once to return to the normal
B A C
the central heating temperature, adjusted using the
keys, at the lowest value possible, compatibility with
the temperature requested in the rooms. If the winter season
is particularly cold, meaning the room temperature can no
longer be maintained, raise the central heating temperature
to higher values.
Figure 7-2 key
A = System ll knob
B = Closing direction
C = Opening direction
or
Figure 7-2 – System ll cock
MYDENS
020002.01.044
46
COSMOGAS
Page 47
7 - USE
7.7 - Adjusting the instantaneous
domestic hot water
The temperature of the domestic hot water is adjusted using
the
been pressed, the display “N” in gure 7-1 starts to ash and
show the temperature that is being set. The temperature of
the domestic hot water can be set to between a range of
40°C and 60°C.
By pressing and holding the
40°C, the message “
domestic hot water service is being switched off. The icon “F”
in gure 7-1 also switches off.
and keys. Once one of the two keys has
key down even below
OFF” appears to indicate that the
7.8 - Central heating
Using parameter 2001, which can be modied by accessing
the “installer prole” (see section 7.16), it is possible to select
different operating modes for the central heating service:
- 2001 = 00; “Constant temperature with TA (Thermostatic
adjustment)”: the central heating supply temperature is
adjusted manually via the or keys.
The opening and closing of the room thermostat stops or
starts the boiler pump correspondingly in order to adjust
the room temperature;
- 2001 = 01; “Climatic adjustment with TA”: The icon
appears on the display; the supply temperature
to the central heating is adjusted automatically by the
external temperature sensor according to the algorithm
corresponding to gure 7-3. The opening and closing
of the room thermostat stops or starts the boiler pump
correspondingly. When the external temperature rises
above the value set under parameter
spring temperature), the central heating service ends. It re-
starts automatically when the external temperature drops
2025 (heating stop
below the temperature set under parameter
Small corrections can be made to the supply temperature
via parameter 2109, as shown in gure 7-3.
- 2001 = 02; “Climatic adjustment with TA compensation”:
The icon
to the central heating is adjusted automatically by the
external temperature sensor according to the algorithm
corresponding to gure 7-3. The opening of the room
thermostat reduces the temperature of the supply to the
central heating by a value set under parameter
The boiler pump operates constantly. When the external
temperature rises above the value set under parameter
appears on the display; the supply temperature
2025 again.
2028.
2025 (heating stop spring temperature), the central
heating service ends. It re-starts automatically when the
external temperature drops below the temperature set
under parameter 2025 again. Small corrections can be
made to the supply temperature via parameter 2109, as
shown in gure 7-3.
-
2001 = 03; “Constant temperature with TA compensation”:
the central heating supply temperature is adjusted manually
COSMOGAS
via the or keys.
Th e opening of t he room therm o s tat reduces th e
temperature of the supply to the central heating by a value
set under parameter
-
2001 = 04; “Control from input 0-10 VDC with TA”: The
heating supply temperature is adjusted by means of the
0-10 VDC signal as shown in gure 5-11. The opening or
closing of the room thermostat has priority over the 0-10
VDC signal adjustment.
47
2028.
MYDENS
Page 48
7 - USE
7.9 - Thermostatic adjustment
The boiler is factory set with parameter 2001 at 00, i.e.
the boiler supplies hot water to the central heating system
at a temperature adjusted using the or keys.
Any room thermostat operates directly on the pump inside the
boiler to adjust the heating of the rooms.
To make full use of the boiler efciency, adjust the temperature
to a value that is just sufcient to obtain the desired temperature
in the rooms. If the season gets colder, progressively increase
the value of the central heating temperature. Proceed
in reverse order when the season goes towards warmer
temperatures.
This very simple operating method is suitable for the following
types of systems:
- small systems, with radiators and where there is one room
whose temperature is characteristic of all other rooms;
- large systems, with radiators, where each area is controlled
by its own room thermostat and the boiler pump is stopped
only when all area thermostats are satised (appropriate
electrical system set-up required);
- large systems, with radiant panels (low temperature), where
each area is controlled by its own room thermostat and the
boiler pump is stopped only when all area thermostats are
satised (appropriate electrical system set-up required).
7.10 - Climatic adjustment
Access the “installer menu” to set parameter 2001 to 01.
The central heating supply temperature is related to the
external temperature sensor according to the algorithm in
gure 7-3. To adapt the calculation line to the various homes/
climatic conditions, all adjustment parameters must be set
according to the following sections. The calculated delivery
temperature is visible by pressing the or key.
Corrections can be made to the line via parameter 2109,
as shown in gure 7-3.
7.10.1 - Climatic adjustment: which
systems?
“Climatic adjustment” is a more sophisticated and precise
adjustment than the “Thermostatic adjustment”. This feature
is able to make full use of boiler efciency and is suitable for
the following types of system:
- small systems, with radiators and where there is one room
whose temperature is characteristic of all other rooms. The
room thermostat makes the appropriate corrections to the
room temperature by switching the boiler pump on and off.
- large systems, with radiators, where each area is controlled
by its own room thermostat and the boiler pump is stopped
only when all area thermostats are satised (appropriate
electrical system set-up required);
- small systems, with radiant panels (low temperature), where
there is one room whose temperature is characteristic of all
other rooms. The room thermostat makes the appropriate
corrections to the room temperature by switching the boiler
pump on and off. - large systems, with radiant panels (low
temperature), where each area is controlled by its own room
thermostat and the boiler pump is stopped only when all
area thermostats are satised (appropriate electrical system
set-up required).
7.10.2 - Climatic adjustment: precautions
during adjustment
To set the supply temperature correctly, it is good practice to
immediately set the line setting values in gure 7-3. If these
values do not give a satisfactory result, make the relevant
changes, keeping in mind that:
- every parameter must be adjusted in small degrees;
- after each change, wait at least 24 hours to see the result;
- the better the adjustment line corresponds to the real
requirements of the building, the more the central heating in
the building will provide comfort and the greater the energy
savings will be;
- the small corrections highlighted in gure 7-3, i.e. moving
the parallel line, can be made using parameter 2109, in
steps of 1°C more or 1°C less, up to 10°C.
7.10.3 - Climatic adjustment: setting the
parameters
Access the “installer prole” (see section 7.16) to set:
2019 = the “Winter heating temperature”, adjustable to
between 20°C and 90°C. The supply temperature assumes
the value set under this parameter when the external
temperature corresponds to that set under parameter
2020. The recommended start values are: 40°C for
low-temperature systems (underoor heating); 70°C for
high-temperature systems (radiators);
- 2020 = the “Outside winter temperature”, adjustable to
between -25°C and 25°C. This is the outdoor temperature
used to dene the heat output necessary for the system.
The recommended start value for a typical home is -5°C;
- 2021 = the “Spring heating temperature”, adjustable to
between 20°C and 90°C. The supply temperature assumes
the value set under this parameter when the external
temperature corresponds to that set under parameter
2022. The recommended start values are: 30°C for
low-temperature systems (underoor heating); 40°C for
high-temperature systems (radiators);
- 2022 = “Outside spring temperature”, adjustable to
between 0°C and 30°C. This is the outdoor temperature at
which the central heating is to reach the minimum supply
temperature. The recommended start value is 20°C;
- 2025 = “Heating stop spring temperature”, adjustable
to between 0°C and 35°C. When the outdoor temperature
reaches the value set under this parameter, the central
heating is switched off automatically. The central heating
sw itches back on auto matica lly whe n the outdoo r
tem p erature drop s back to below th is value. The
recommended start value is 22°C.
- It is also possible to set the minimum and maximum central
heating temperatures using the respective parameters
2110, 2111, 2023 and 2024 in section 7.16.
MYDENS
48
COSMOGAS
Page 49
7 - USE
7.10.4 - Climatic adjustment: adaptation to
different climatic areas
The previously recommended values are for homes with
average insulation and for climatic areas where the external
temperature used for calculating the heat requirement is -5°C
(with these data and a high-temperature system, there is
correspondence with the graph in gure 7-3). If the climatic
area is different, adjust parameter 2020, “Outside winter
temperature”, so as to obtain a supply temperature of 70°C
(40°C in the case of “low-temperature” systems), when
the external temperature is the one used as the basis for
calculating the heat requirement.
7.10.5 - Climatic adjustment: switching the
central heating service on and off
The climatic adjustment service is completely automatic,
including switch-off at the end of the season and switch-on
at the start of the next season via parameter
the outside temperature rises above the value set under this
parameter, the central heating switches off automatically.
When the outside temperature drops back below the value
set under this parameter, the central heating service switches
back on automatically.
2025. When
7.10.6 - Climatic adjustment with room
compensation
Access the “installer prole” (see section 7.16) to adjust
parameter 2001 to 02. Everything operates exactly
as in the previous sections on “Climatic adjustment”, the
only difference being that now the boiler pump is always
on. Opening the room thermostat contact translates into a
downward parallel translation of the line in gure 7-3 for the
value set under parameter 2028, which can be set from
the “installer prole” (see section 7.16). Parameter 2028
can assume values between 0°C and 30°C. The values
recommended for this parameter are:
- 10°C for high-temperature systems (radiators)
- 3°C for low-temperature systems (underoor heating).
Values that are too high can translate into room temperature
instability. Values that are too low can make the room
thermostat ineffective.
COSMOGAS
The climatic adjustment with room compensation can be used
in all cases specied in section 7.10.1, with the advantage
that the pump’s continues operation stabilises the room
temperatures and makes them uniform, especially where
some of the heat system loops have ow resistances that are
much higher than others.
49
MYDENS
Page 50
7 - USE
Par. 2109
Calculated temperature (°C)
Par. 2020
Par. 2022
Par. 2025
Par. 2019 = - Winter heating temperature
Par.
2020 = - Outside winter temperature
2021 = - Spring heating temperature
Par.
Par. 2022 = Outside spring temperature
Par. 2110
External temperature (°C)
Par. 2021
Par. 2019
Par. 2111
Par. 2025 = Heating stop spring temperature
Par. 2109 = Adjusting the line parallelism
Par. 2110 = Minimum heating temperature setting
Par. 2111 = Maximum heating temperature setting
Figure 7-3 – Climatic adjustment graph for “high temperature” systems (with radiators)
MYDENS
50
COSMOGAS
Page 51
7 - USE
7.11 - Timers for the various functions
To protect the lifespan of the appliance, improve comfort, and
increase energy savings, timers have been introduced during
operation. These time settings are as follows:
- Pump post-circulation: every time the room thermostat
determines the end of the central heating service, the pump
continues to operate for 3 minutes;
- Central heating delay: every time the domestic hot water
service finishes, before the central heating service is
reactivated, there is a standby period of 2 minutes;
- Pump and diverter valve anti-block function: every 24 hours,
the central heating pump, the domestic hot water pump (if
present) and the diverter valve are forced;
- Anti-legionella: if the boiler is connected to an indirect water
heater for preparing DHW, every seven days the indirect
water heater is forced to a temperature of 60°C to disinfect
it and protect against legionella bacteria. This function is
also activated two hours after the boiler has been powered
electrically.
- Ignition delay: In all operating modes, excluding domestic
hot water mode, every time the burner switches off, it waits
3 minutes before it ignites again.
7.12 - Pump and diverter
valve anti-block function
During the summer, the pump switches on once every 24
hours for 15 seconds in order to prevent any deposits from
blocking it. The diverter valve and the indirect water heater
pump (if present) are activated at the same time for the
same reason.
7.13 - Anti-freeze protection
WARNING! For the anti-freeze protection to be
effective, the appliance must be left with the electrical
power supply and gas supply present and the two
services (domestic hot water and central heating) in the
OFF position.
WARNING! The anti-freeze protection service
offered by the boiler cannot guarantee anti-freeze
protection of the central heating system, the domestic
hot water system or the building itself, or a part of the
same.
The central heating pump starts automatically when the
boiler temperature reaches 7°C. If the temperature drops
further to below 2°C, the burner also ignites to protect the
boiler from the effects of freezing.
If the boiler is not used for a long period of time (over a year),
empty it following the procedures in sections 8.19 and 8.20.
7.14 - Automatic system
lling (on request)
The appliance is usually supplied with a manual cock for
lling the central heating system. On request, the boiler can
be manufactured with automatic system ll.
COSMOGAS
51
MYDENS
Page 52
7 - USE
7.15 - “User prole”
Each time the appliance is switched on, the “user prole” opens
by default.
To adjust the heating setpoint, press the or keys;
to adjust the DHW setpoint, press the and keys.
To display the parameters that are available for consultation in
this prole, press the RESET button once. The display “M” in
gure 7-1 shows parameter 0.000.
Press the
parameters within this prole. Once the desired parameter has
been found, press the ENTER key to select it. Then use the
and keys to change it and press the RESET
key again to conrm the change.
To exit the parameter, press the key.
To exit parameter consultation mode, press the key.
If no key is pressed for more than 60 seconds, consultation
mode is exited automatically.
The following parameters can be examined in this prole:
Parameter Description of the parameter
0003
0048 DHW temperature requested User °C Value
0200 Forcing Installer Test
Central heating temperature requested
Access
level
User °C Value
U.M. Setting range
OFF = No forcing
FAN = fan only at maximum speed
Lo = burner at minimum power
Ign = burner at ignition power
Hi = burner at maximum power
rEg = burner at power regulated by parameter 2014;
Stb = Burner stopped;
LCO01 = Safety input 1 test (N/A)
LCO02 = Safety input 2 test (N/A)
and keys to scroll through the
Factory
value
OFF
0901 Temperature unit of measurement Factory °C/°F C/F C
0902 Pressure unit of measurement Factory bar/psi bar/psi bar
0997 Display icon test User
0998 Installer access code Factory Code 0000-9999 0300
0999 Factory access code Factory Code 0000-9999
Parameters for consultation only:
Parameter Description of the parameter
1001 Delivery temperature User °C
1002 Domestic hot water temperature (or indirect water heater temperature, if present) User °C
1003 Cold water temperature (N/A) User /
1004 External temperature (visible when an external temperature sensor is installed) User °C
1005 Delivery temperature (according to sensor) User °C
1006 Fumes temperature User °C
1007 Return temperature User °C
1008 Ionisation current (see section 8.22) User μA
1012 Temperature required by climatic curve or by input 0-10 V User °C
Access
level
U.M.
MYDENS
52
COSMOGAS
Page 53
7 - USE
1013
1014 Fumes temperature (according to sensor) (N/A) User (N/A)
1015 Cascade temperature User °C
1030 Burner status (2 = Stand by; 8 = Flame present; 11 = Post-circulation pump); User Value
1031 Error code User Value
1033 Central heating water pressure User bar
1040 Current fan speed User RPM
1041 Fan speed at ignition User RPM
1042 Fan speed at minimum power User RPM
1043 Fan speed at maximum power User RPM
1051 Last lock code (Loc) (see section 7.17.1) (255 means no locks) User Value
1052 Last error code (Err) (see section 7.17.2) (255 means no errors) User Value
1053 Number of failed ames User Value
1054 Number of successful ignition attempts User Value
1055 Number of failed ignition attempts User Value
1056 Operating hours in heating mode User hx10
1057 Operating hours in domestic hot water mode User hx10
1058 Total operating hours (power supply to the appliance) User days
1059 Time between last two locks (Loc) User
Room thermostat input status
(OPEN = no central heating request; CLOSED = central heating request)
User OPEN/CLOSED
1: mins
2: hours
3: days
4: weeks
1: mins
1060 Time between last two errors (Err) User
1061 Instant turbine speed User RPM
1062 Domestic hot water ow rate User l/min
1063 Input 0-10 V User volt
1090 Days until maintenance (negative when the deadline has expired) User days
1098 Command board version User Hexadecimal
1099 Appliance software version User Hexadecimal
1995 Display software version User Hexadecimal
* N/A = Not applicable;
2: hours
3: days
4: weeks
COSMOGAS
53
MYDENS
Page 54
7 - USE
7.16 - “Installer prole”
WARNING! Changing these parameters
could cause boiler and therefore system
malfunctions. For this reason, only a technician
that has an in-depth knowledge of the appliances
can modify them.
To analyse the operation and adaptation of the appliance
to the system, the technician has access to the parameters
below via the “installer prole”.
To access this prole:
1.- Press the RESET key; the display “M” in gure 7-1
shows parameter
to scroll to the CodE parameter and press
RESET to access it.
2.- Type the code
use keys
0 and conrm with the RESET key;
0 and conrm with the RESET key;
0 and conrm with the RESET key;
3 and conrm with the RESET key;
0.000. Use keys and
0300 in the following way:
and to select the values:
3.- The
through the parameters within this prole:
4.- Once the desired parameter is displayed, it can be
changed as follows:
a.- Press the RESET key to access the parameter (the
display “N” in gure 7-1 starts to ash);
b.- Modify the value of the parameter using the
and
c.- Press the RESET key to conrm the change and go
back to the list of parameters;
5.- Press the key twice to exit.
If no key is pressed for more than 5 minutes, the menu returns
to the “user” prole. Any changes to data that have not been
conrmed using the RESET key will be lost.
WARNING! Any variations made to the
and keys can be used to scroll
keys;
parameters must be noted in the “Customised
values” column in the following table, in order to
facilitate any future replacements of the command
and control board.
The following parameters can be changed or examined in
this prole:
Parameter Description of the parameter Access
level
2001 Central heating mode Installer # 0 = Constant temperature with TA;
2003 Central heating temperature requested Installer °C 30-80 60
2005 Heating post-circulation pump Installer Secs 0-900 120
2006 Maximum fumes temperature Factory °C 10-120 95
2007 Heating positive hysteresis Factory °C 0-20 5
2009 Delay against frequent burner ignition Installer Secs 10-900 180
2010 Temperature differential against frequent burner
ignition
2012 Maximum differential heat exchanger temperature Factory °C 10-80 30
2013 Maximum differential heat exchanger temperature
delay
2014 Central heating maximum power Installer % 1-100 75
2015 Central heating minimum power Installer % 1-75 1
2016 Heating PID factor P Factory # 0-1275 20
2017 Heating PID factor I Factory # 0-1275 100
2018 Heating PID factor D Factory # 0-1275 0
2019 Climate - Winter heating temperature Installer °C 20-90 80
2020 Climate - Outside winter temperature Installer °C -25-25 -5
2021 Climate - Spring heating temperature Installer °C 20-90 40
2022 Climate - Outside spring temperature Installer °C 0-30 20
Installer °C 0-20 16
Factory Secs 10-250 10
U.M. Setting range Factory
value
0
1 = Climatic with TA;
2 = Climatic compensated by TA;
3 = Constant temperature compensated by TA;
4 = Control from input 0-10 V with
TA;
5 = N/A
Customised
values
MYDENS
54
COSMOGAS
Page 55
7 - USE
2023 Climatic - Minimum heating temperature (priority
over Par. 2021)
2024 Climatic - maximum heating temperature (priority
over Par. 2019)
2025 Climatic - Heating stop spring temperature Installer °C 0-35 22
2026 Heating acceleration increase (N/A) Installer °C 0-30 0
2027 Heating acceleration delay (N/A) Installer min 1-120 0
2028 Night heating reduction by opening TA Installer °C 0-30 10
2035 DHW mode Installer # 0 = No domestic hot water;
2036 Puffer negative hysteresis Factory °C 0-20 3
2037 Puffer positive hysteresis Factory °C 0-20 3
2038 Delivery temperature increase for puffer Installer °C 0-30 0
2039 Puffer ll delivery negative hysteresis Factory °C 0-20 5
2040 Puffer ll delivery positive hysteresis Factory °C 0-20 5
2041 Puffer maintenance temperature (N/A) Factory °C 0-10 5
2042 DHW priority mode with puffer Installer # 0 = Time (time set under par.
2043 DHW/heating priority timing Installer min 1-255 60
Installer °C 0-80 30
Installer °C 27-90 80
5
1 = Puffer with temperature sensor;
2 = Puffer with thermostat;
3 = N/A;
4 = N/A;
5 = Plate heat exchanger;
6 = N/A;
7 = Hot water heater with recirculation control;
8 = Hot water heater;
2
2043);
1 = Heating priority;
2 = DHW priority;
3 = N/A;
2044 DHW post-circulation Installer Secs 0-900 40
2045 Puffer PID factor P Factory # 0-1275 50
2046 Puffer PID factor I Factory # 0-1275 270
2047 Puffer PID factor D Factory # 0-1275 0
2048 DHW temperature requested Installer °C 40-80 50
2049 Instant DHW negative hysteresis Factory °C 0-20 5
2050 Instant DHW positive hysteresis Factory °C 0-20 5
2051 Instant DHW PID factor P Factory # 0-1275 50
2052 Instant DHW PID factor I Factory # 0-1275 270
2053 Instant DHW PID factor D Factory # 0-1275 0
2060 DHW ow rate detection Factory l/min 0.1-20.0 2.5
2061 Flow rate at which the setpoint can be reached at
minimum power (N/A)
2062 Flow rate at which the setpoint can be reached at
maximum power (N/A)
2063 DHW modulation timing ON/OFF Factory Secs 30
Factory l/min 2.5
Factory l/min 2.5
COSMOGAS
55
MYDENS
Page 56
7 - USE
2064 DHW recirculation pre-heat mode
(only for 2035 = 7)
2065 ECO recirculation temperature (see par. 2064) Factory °C 20-60 30
2067 Recirculation pre-heat timer after call Factory Secs 0-255 30
2068 DHW timer after call Factory Secs 0-255 120
2069 Recirculation pre-heat negative hysteresis Factory °C 0-30 0
2070 Recirculation pre-heat positive hysteresis Factory °C 0-30 5
2071 Recirculation pre-heat delay Factory Secs 0-15 10
2091 Maximum DHW temperature setting Installer °C 50-90 60
2092 Maximum fan speed setting Factory RPM 1750-9999
2093 Minimum fan speed setting Factory RPM 500-7050
2094 Setting fan speed ignition Factory RPM 1950-7050
2096 Minimum DHW temperature setting Installer °C 20-50 40
2109 Climatic offset adjustment
(parameter 2001 = 1 or 2)
2110 Minimum heating temperature setting for 0-10 V
control (2001 = 4)
2111 Maximum heating temperature setting for 0-10 V
control (2001 = 4)
2112 Central heating negative hysteresis Factory °C 0-20 5
2113 Maximum power in DHW mode Installer % 50-100 100
2114 Minimum power in DHW mode Installer % 1-30 1
2115 DHW puffer temperature setting Installer °C 20-80 50
2116 Programmable input J7 2-3
Central heating pressure sensor
2117 Programmable input J7 7-8
1 = Instantaneous DHW ow sensor;
2 = Instantaneous DHW thermostat;
3 = Heat exchanger ow sensor;
2118 Programmable input J7 9-10 Installer # 0 = Disabled
2120 Programmable input J6 3-10
Return temperature sensor
2121 Programmable input J6 5-12
Fumes temperature sensor
2122 Programmable input J6 6-13
Cascade sensor
2123 Programmable input J7 2-4 Installer # 0 = Disabled
2124 Room thermostat programmable input Installer # 0 = Disabled
2125 Programmable output 1 J3 3-8
6 = Alarm
7 = Automatic lling
Installer # 0 = Off;
1 = Antifreeze (N/A)
2 = Eco (recirculation kept at
value set under 2065);
3 = Comfort (recirculation keep at
DHW temperature);
Installer °C OFF - 10-10 0
Installer °C 20-50 20
Installer °C 50-90 80
Installer # 0 = Disabled
1 = Enabled
2 = N/A
3 = N/A
Installer # 0 = Disabled
1 = Enabled point 1
2 = Enabled point 2
3 = Enabled point 3
4 = N/A;
2 = N/A
Installer # 0 = Disabled
1 = Enabled
Installer # 0 = Disabled
1 = Enabled
2 = N/A
Installer # 0 = Disabled
1 = N/A
3 = Enabled
1 = N/A
3 - 6 = N/A
1 = Enabled
Installer # 0 = Disabled
1-5 = Not applicable
6 = Enabled point 6
7 = Enabled point 7
0
1
1
0
1
1
3
0
1
0
MYDENS
56
COSMOGAS
Page 57
7 - USE
2126 Programmable output 2 J3 5-10
9 = External spark generator
2127 Programmable output 3 J3 6 Installer # 0 = Disabled
2128 Output setting
18 = 3-way DHW valve in standby
20 = 3-way central heating valve in standby
2129 Domestic hot water ow rate sensor Installer # 0 = Bitron
2130 Domestic hot water ow rate factor (N/A) Installer l/min 0-25.5 3.2
2131 Minimum central heating water pressure Installer bar OFF 0.1-5.0 0.8
2132 Automatic lling hysteresis Installer bar OFF 0.1-1.0 0.5
2133 Modulating pump temperature differential Installer °C 5-40 15
2134 Modulating pump ignition time Installer Secs 0-255 120
2135 Type of modulating pump Installer # 0 = Wilo Yonos;
2136 Modulating pump mode Installer # 0 = Not modulating
2137 Minimum pump modulation power Installer % 0-100 40
2138 Fan speed map Installer # 50-55 50
2139 Air bleed function (N/A) Installer 0-2 0
2140 Minimum heat exchanger water ow rate (N/A) Installer
2141 Rated heat exchanger water ow rate (N/A) Installer
Factory # 0 = Disabled
1-8 = N/A
9 = Enabled point 9
10 = N/A
1-10 = N/A
Installer # 0 = Disabled
1-17 = N/A
18 = Enabled point 18
19 = N/A
20 = Enabled point 20
1 = Huba DN8
2 = Huba DN10
3 = Huba DN15
4 = Huba DN20
5 = N/A
1 = Salmson;
2 = Grundfos;
1 = Modulating
2 = N/A
3 = N/A
4 = xed speed at 40%
5 = xed speed at 50%
6 = xed speed at 60%
7 = xed speed at 70%
8 = xed speed at 80%
9 = xed speed at 90%
10 = xed speed at 100%
l/min/10
l/min/10
0-10 0.8
0-10 4.3
9
0
20
0
0
10
2201 Enable/disable central heating Installer EnA = Enabled
dIS = Disabled
2202 Enable/disable domestic hot water Installer EnA = Enabled
dIS = Disabled
2203 Setting maintenance requests Installer ON = On
OFF = Off
RST = Reset
2204 Days until maintenance request Installer days 30-1275 1000
2205 Anti-freeze protection Installer EnA = Enabled
dIS = Disabled
2206 Anti-legionella Installer EnA = Enabled
dIS = Disabled
2207 DHW detection delay Installer secs 0-255 1
COSMOGAS
57
EnA
EnA
OFF
EnA
EnA
MYDENS
Page 58
7 - USE
7.16.1 - Parameters for cascade systems
WARNING! Changing these parameters
could cause boiler and therefore system
malfunctions. For this reason, only a technician
that has an in-depth knowledge of the appliances
can modify them.
For systems with appliances installed in a cascade, the
following parameters can be changed or examined (accessible
from the installer prole only):
Parameter Description of the parameter Access
level
4072 Emergency mode Installer NO/YES NO
4074 Emergency temperature Installer °C 20-90 45
4075 Next module ignition delay Installer Secs 5-1275 60
4076 Next module shutdown delay Installer Secs 5-1275 60
4077 Module ignition negative hysteresis Factory °C 0-20 5
4078 Module shutdown positive hysteresis Factory °C 0-20 5
4079 Cascade temperature maximum decrease Installer °C 0-20 6
4080 Cascade temperature maximum increase Installer °C 0-20 6
4081 Modulation delay Installer min 0-60 1
4082 Next module insertion power Installer % 10-100 80
4083 Next module removal power Installer % 10-100 40
4084 Rotation interval Installer days 0-30 5
4086 Cascade temperature control PID, parameter P Factory # 0-1275 20
4087 Cascade temperature control PID, parameter I Factory # 0-1275 300
4142 Next module rapid ignition delay Installer Secs 5-1275 30
4143 Next module rapid shutdown delay Installer Secs 5-1275 30
U.M. Setting range Factory
value
Customised
values
4144 Module rapid ignition negative hysteresis Factory °C 0-20 5
4145 Module rapid shutdown positive hysteresis Factory °C 0-20 5
4146 All module shutdown positive hysteresis Installer °C 0-20 7
4147 Number of modules in cascade (Master included) Installer # 0-8 0
4148 Power management
0 = modulation on cascade temperature;
1 = minimum number of active modules;
2 = maximum number of active modules;
3 = balanced number of active modules;
4149 First module igniting (due to rotation) Installer # 1-8 1
4150 Positive power turn PID Factory # 0-26 0
4151 Negative power turn PID Factory # 0-26 0
4152 Power management 2 (parameter 4148) – Minimum
power
4153 Power management 2 (parameter 4148) – hyster-
esis
4154 Cascade pump post-circulation Installer Secs 0-255 60
4155 Cascade sensor anti-freeze temperature Installer °C 10-30 15
4184 Module logical address Installer # 0-8 0
Installer # 0 = Enabled point 0
1 = Enabled point 1
2 = Enabled point 2
3 = Enabled point 3
Installer % 0-100 10
Installer % 0-100 40
2
MYDENS
58
COSMOGAS
Page 59
7 - USE
7.17 - Diagnostics
During normal appliance operation, the display “N” in gure
7-1, shows the working status of the appliance via the following
indications:
Parameter Description of the parameter Display “N” in gure 7-1
AttE
FILL
Loc
Err
ALEg
Boiler not locked but alarm pending Alarm code (see section 7.17.3 for code key)
System pressure too low, perform lling (see section 6.1.3) FILL
Boiler in lock mode. To reset, press and hold the RESET button until the rSt message is displayed. If the lockout occurs
frequently, contact a professional qualied technician
Boiler in error mode. Restore operation by resolving the cause
of the anomaly. Contact a professionally qualied technician Error code (see section 7.17.2 for code key)
Anti-legionella function running (see section 7.11).
It will end when the water in the indirect water heater reaches
60°C.
Lock code (see section 7.17.1 for code key)
Indirect water heater temperature (°C)
SEr
Boiler maintenance request
7.17.1 - Diagnostics: locks “Loc”
Once the type of “Loc” has been displayed and the appropriate
checks and solutions have been found and carried out, reset
the appliance by pressing and holding the RESET button
(detail “B” in gure 7-1) until the “rSt” message is displayed.
Lock Lock description Checks Solutions
Loc 0 Internal memory error
E2prom at command
board
Loc 1 No ame detection after
three successive ignition
attempts
Loc 2 Gas valve command relay
broken
Loc 3 The appliance has
reached the maximum
intervention temperature
Loc 4 Boiler in error mode for
more than 20 hours
Check: supply gas pressure (see section 6.6),
sparks on the ignition electrodes (see section 8.6);
230 VAC electric power supply to the gas valve;
electric resistance of the two gas valve coils of 0.88
kohm and 6.59 kohm.
If the burner comes on and goes off at the end of the
ignition attempt, check: that the ionisation current is
above 4 (see section 8.22)
Check that the pump works;
Check that the electrical resistance of the two sensors
matches the graph in section 8.24;
Check that the high limit ue gas temperature fuse has
not been triggered;
Check the last error displayed on the board. Respond according to the last error displayed.
Replace the command and control board.
If the supply pressure is not correct, adjust the
components before the appliance to restore the
correct value. If the current at the gas valve is not
230 VAC, replace the command and control board.
If the electric resistance of the gas valve is not 0.88
kohm and 6.59 kohm, replace the valve.
If the ionisation current is not over 4, check the
(see section 6.7) and restore it to the correct
CO
2
value. Check the ionisation spark plug and replace
it if necessary. Check the integrity of the ionisation
current electric circuit cables.
Replace the command and control board.
Restore the water circulation or replace the command
and control board;
If either or both of the sensors are not within the correct
values, replace them;
If the ue gas temperature fuse has been triggered
(the contact is open), carefully check the appliance
efciency as detailed in section 8.23 before replacing it;
WARNING! If the efficiency is not within the
specied limits, DO NOT ATTEMPT TO RESET
THEM. Please contact the manufacturer.
COSMOGAS
59
MYDENS
Page 60
7 - USE
Loc 5 Fan stopped for more
than 60 seconds
Loc 6 Fan too slow for more
than 60 seconds
Loc 7 Fan too fast for more
than 60 seconds
Loc 8 Software error on the
command board
Loc 9 Content of the command
board internal memory
E2prom not updated
Loc 10 E2prom memory param-
eters incorrect
Loc 11 Software error on the
command board
Loc 12 Software error on the
command board
Loc 13 Software error on the
command board
Loc 14 Software error on the
command board
Loc 15 Flue fuse
Check it is powered at 300 VDC. If the fan is powered, it must be replaced; otherwise,
replace the command board.
Check it is powered at 300 VDC. If the fan is powered, it must be replaced; otherwise,
replace the command board.
Check it is powered at 300 VDC. If the fan is powered, it must be replaced; otherwise,
replace the command board.
Replace the command board.
Replace the command board.
Replace the command board.
Replace the command board.
Replace the command board.
Replace the command board.
Replace the command board.
Check that the high limit ue gas temperature fuse
has not been triggered
If the ue gas temperature fuse has been triggered
(the contact is open), carefully check the appliance
efciency as detailed in section 8.23 before
replacing it;
WARNING! If the efciency is not within the
specied limits, DO NOT ATTEMPT TO RESET
THEM. Please contact the manufacturer.
The supply temperature
exceeds 105°C with the
gas valve closed
Loc 16
Loc 17 Software error on the
Loc 18 Software error on the
Loc 19 Software error on the
Loc 20 Flame present 10
Loc 21 Flame present before
Exhaust ue maximum
temperature.
WARNING! If the lock
is repeated more than
once a day, turn off the
appliance and contact
a qualied service
centre.
NOT ATTEMPT TO
REPAIR THE APPLIANCE.
command board
command board
command board
seconds after gas valve
is closed
ignition
Check that the electrical resistance of the two supply
sensors matches the graph in section 8.24.
Check that the gas valve closes the gas correctly
when the burner switches off.
Check there is no air in the central heating circuit;
bleed the highest radiators;
Check the circulation pump is operating correctly;
Check that the ue exhaust temperature is not more
than 30°C above the return temperature;
Measure the boiler efciency; it must correspond to
value declared in the technical features.
If one of the two sensors does not match, the double
supply sensor must be replaced.
The gas valve must be replaced if it does not close
correctly.
Bleed the air from the boiler and from the highest
central heating elements with respect to the boiler.
If the pump is not working, it must be replaced.
If the difference between the return temperature and
the ue gas temperature is above 30°C, contact a
qualied service centre.
If the efciency does not correspond to the data at
the end of the manual, the primary heat exchanger
is probably dirty from the ue gas side or the water
side. Clean and check efciency again.
Replace the command board.
Replace the command board.
Replace the command board.
Replace the gas valve or the command board.
Replace the gas valve or the command board.
MYDENS
60
COSMOGAS
Page 61
7 - USE
Loc 22 Flame lost three times Check that the ionisation current is above 4 (see
section 8.22)
Check that the fumes exhaust is properly protected
against obstructions caused by gusts of wind
Loc 23 Software error on the
command board
Loc 24 Software error on the
command board
Loc 25 The two supply sensors
measure temperatures
that are at least 10°C
different for more than
60 seconds.
Loc 26 Software error on the
command board
Loc 27 Too many system loads
in one hour
Loc 28 System lling time too
long
Loc 29 Software error on the
command board
Loc 30 Software error on the
command board
Loc 31 Software error on the
command board
Loc 32 Software error on the
command board
Loc 33 Software error on the
command board
Loc 34 Software error on the
command board
Loc 35 Software error on the
command board
Loc 36 Software error on the
command board
Loc 37 Software error on the
command board
Loc 38 Software error on the
command board
Check that the electrical resistance of the two sensors
matches the graph in section 8.24;
Check the pressure switch calibration pressure. “FILL”
must appear when the pressure drops below 0.6 bar
and disappear when the pressure rises above 1.5 bar;
check that there are no water leaks from the central
heating system
Check the pressure switch calibration pressure. “FILL”
must appear when the pressure drops below 0.6 bar;
check that there are no water leaks from the central
heating system
If the ionisation current is not over 4, check the CO2 (see
section 6.7) and restore it to the correct value. Check the
ionisation spark plug and replace it if necessary. Check
the integrity of the ionisation current electric circuit cables.
If the ue gas outlet is on a vertical wall it must be
protected by a windproof grill; if the ue gas outlet is
on the roof, check that it is not in a area where there
is owback, and that any windproof chimney that may
be provided is really effective
Replace the command board.
Replace the command board.
If either or both of the sensors are not within the correct
values, replace them;
Replace the command board.
If the pressure switch is not calibrated correctly, it
must be replaced. If the system has a leak, it must
be repaired.
If the pressure switch is not calibrated correctly, it
must be replaced. If the system has a leak, it must
be repaired.
Replace the command board.
Replace the command board.
Replace the command board.
Replace the command board.
Replace the command board.
Replace the command board.
Replace the command board.
Replace the command board.
Replace the command board.
Replace the command board.
COSMOGAS
61
MYDENS
Page 62
7 - USE
7.17.2 - Diagnostics: errors “Err”
Error Error description Checks Solutions
Err 100 Software error on the
command board
Err 101 Software error on the
command board
Err 102 Software error on the
command board
Err 103 Software error on the
command board
Err 104 Software error on the
command board
Err 105 The supply temperature
exceeds 95°C with the
gas valve closed
Err 106 Software error on the
command board
Err 107 Software error on the
command board
Err 108 Software error on the
command board
Err 109 Software error on the
command board
Err 110 Software error on the
command board
Err 111 0-10 V input polarity
reversed
Check that the electrical resistance of the two supply
sensors matches the graph in section 8.24.
Check that the gas valve closes the gas correctly
when the burner switches off.
Check the polarity input 0-10 V Restore correct polarity
Replace the command board.
Replace the command board.
Replace the command board.
Replace the command board.
Replace the command board.
If one of the two sensors does not match, the double
supply sensor must be replaced.
The gas valve must be replaced if it does not close
correctly.
Replace the command board.
Replace the command board.
Replace the command board.
Replace the command board.
Replace the command board.
Software error on the
command board
Err 112 Software error on the
command board
Err 113 0-10 V input polarity
reversed
Software error on the
command board
Err 114 Flame detected in a
moment when it should
not be
Err 115 Low central heating
water pressure
Err 116 Central heating water
pressure sensor error
Err 117 Software error on the
command board
Err 118 Software error on the
command board
Err 119 Return sensor circuit
(1007) open
Err 120 Supply sensor circuit 1
(1001) open
Replace the command board.
Replace the command board.
Check the polarity input 0-10 V Restore correct polarity
Replace the command board.
Replace the gas valve or the command board.
Check the pressure switch calibration pressure.
“FILL” must appear when the pressure drops below
0.6 bar; check that there are no water leaks from the
central heating system.
Check the pressure switch calibration pressure.
“FILL” must appear when the pressure drops below
0.6 bar; check that there are no water leaks from the
central heating system.
Check that the electric resistance of the sensor
matches the graph in section 8.24. Check the electric cables for connection between the sensor and
the command board.
Check that the electric resistance of the sensor
matches the graph in section 8.24. Check the electric cables for connection between the sensor and
the command board.
If the pressure switch is not calibrated correctly, it
must be replaced. If the system has a leak, it must
be repaired.
If the pressure switch is not calibrated correctly, it
must be replaced. If the system has a leak, it must
be repaired.
Replace the command board.
Replace the command board.
If the electric resistance does not match, replace it. If
the electric circuit is damaged, repair it. Where neither
of the two previous cases apply, replace the command board.
If the electric resistance does not match, replace it. If
the electric circuit is damaged, repair it. Where neither
of the two previous cases apply, replace the command board.
MYDENS
62
COSMOGAS
Page 63
7 - USE
Err 121 Supply sensor circuit 2
(1005) open
Err 122 Domestic hot water sen-
sor circuit (1002) open
Err 123 Fumes sensor circuit 1
(1006) open
Err 124 Fumes 2 sensor circuit
(1014) open (N/A)
Err 125 External temperature
sensor circuit (1004)
open
Err 126 Return sensor circuit
(1007) in short circuit
condition
Err 127 Supply sensor circuit 1
(1001) in short circuit
condition
Err 128 Supply sensor circuit 2
(1005) in short circuit
condition
Err 129 Domestic hot water sen-
sor circuit (1002) in short
circuit condition
Err 130 Fumes sensor circuit 1
(1006) in short circuit
condition
Err 131 Fumes sensor circuit 2
(1014) in short circuit
condition (N/A)
Err 133 Incorrect electrical mains
frequency
Check that the electric resistance of the sensor
matches the graph in section 8.24. Check the electric cables for connection between the sensor and
the command board.
Check that the electric resistance of the sensor
matches the graph in section 8.24. Check the electric cables for connection between the sensor and
the command board.
Check that the electrical resistance of the fumes sensor 1006 matches the graph in section 8.24
Check that the wires between the board and the
double fumes sensor are connected correctly
Check that the electrical resistance of the fumes sensor 1014 matches the graph in section 8.24
Check that the wires between the board and the
double fumes sensor are connected correctly
Check that the electrical resistance of the external
temperature sensor (1004) matches the graph in
section 8.25
Check that it has been connected correctly
Check that the electric resistance of the sensor
matches the graph in section 8.24. Check the electric cables for connection between the sensor and
the command board.
Check that the electric resistance of the sensor
matches the graph in section 8.24. Check the electric cables for connection between the sensor and
the command board.
Check that the electric resistance of the sensor
matches the graph in section 8.24. Check the electric cables for connection between the sensor and
the command board.
Check that the electric resistance of the sensor
matches the graph in section 8.24. Check the electric cables for connection between the sensor and
the command board.
Check that the electrical resistance of the fumes sensor 1006 matches the graph in section 8.24
Check that the wires between the board and the
double fumes sensor are connected correctly
Check that the electrical resistance of the fumes sensor 1014 matches the graph in section 8.24
Check that the wires between the board and the
double fumes sensor are connected correctly
Check that the electrical frequency is 50 Hz If the frequency is not 50 Hz, contact your electricity
If the electric resistance does not match, replace it. If
the electric circuit is damaged, repair it. Where neither
of the two previous cases apply, replace the command board.
If the electric resistance does not match, replace it. If
the electric circuit is damaged, repair it. Where neither
of the two previous cases apply, replace the command and control board.
If the sensor does not match, the double fumes sensor must be replaced.
If the wires are not connected correctly, the connections must be restored.
If the sensor does not match, the double fumes sensor must be replaced.
If the wires are not connected correctly, the connections must be restored.
If the sensor does not match, it must be replaced.
If the wires are not connected correctly, the connections must be restored.
If the electric resistance does not match, replace it. If
the electric circuit is damaged, repair it. Where neither
of the two previous cases apply, replace the command and control board.
If the electric resistance does not match, replace it. If
the electric circuit is damaged, repair it. Where neither
of the two previous cases apply, replace the command and control board.
If the electric resistance does not match, replace it. If
the electric circuit is damaged, repair it. Where neither
of the two previous cases apply, replace the command and control board.
If the electric resistance does not match, replace it. If
the electric circuit is damaged, repair it. Where neither
of the two previous cases apply, replace the command and control board.
If the sensor does not match, the double fumes sensor must be replaced
If the wires are not connected correctly, the connections must be restored
If the sensor does not match, the double fumes sensor must be replaced
If the wires are not connected correctly, the connections must be restored
supplier
Err 134 RESET key pressed
too many times in short
period
Err 135 Software error on the
command board
Err 136 Software error on the
command board
Err 137 Software error on the
command board
Err 138 Software error on the
command board
COSMOGAS
Wait 5 seconds after each press of the RESET key
63
If the frequency is 50 Hz, replace the command
board
Replace the command board.
Replace the command board.
Replace the command board.
Replace the command board.
MYDENS
Page 64
7 - USE
Err 139 Software error on the
command board
Err 140 Software error on the
command board
Err 141 Software error on the
command board
Err 142 Software error on the
command board
Err 143 Software error on the
command board
Err 144 Software error on the
command board
Err 145 Software error on the
command board
Err 146 Software error on the
command board
Err 147 Software error on the
command board
Err 148 Software error on the
command board
Err 149 Software error on the
command board
Err 150 Software error on the
command board
Err 151 Software error on the
command board
Err 152 Software error on the
command board
Err 153 Software error on the
command board
Err 154 Software error on the
command board
Err 155 Software error on the
command board
Err 156 Software error on the
command board
Err 157 Software error on the
command board
Err 158 Software error on the
command board
Err 159 Software error on the
command board
Err 160 Software error on the
command board
Err 161 Software error on the
command board
Err 162 Fill alert The pressure is too low. The request is interrupted
but no error must be stored at this time
Err 163 Software error on the
command board
Err 164 Software error on the
command board
Err 165 Supply current too low Power supply current too low for more than 60
seconds
Err 166 Supply current too high Power supply current too high for more than 60
seconds
Replace the command board.
Replace the command board.
Replace the command board.
Replace the command board.
Replace the command board.
Replace the command board.
Replace the command board.
Replace the command board.
Replace the command board.
Replace the command board.
Replace the command board.
Replace the command board.
Replace the command board.
Replace the command board.
Replace the command board.
Replace the command board.
Replace the command board.
Replace the command board.
Replace the command board.
Replace the command board.
Replace the command board.
Replace the command board.
Replace the command board.
Replace the command board.
Replace the command board.
N/A = Not applicable;
MYDENS
64
COSMOGAS
Page 65
7 - USE
7.17.3 - Diagnostics: alarms “AttE”
Alarm Alarm description Checks Solutions
AttE 200 Lost cascade communi-
cation
AttE 201 Protective anode active N/A Replace the command and control board
AttE 202 Connected appliance
recognition error
AttE 203 Communication lost with
appliance connected in
cascade
AttE 204 External probe error
(contact open or shortcircuited)
AttE 205 Cascade probe error
(contact open or shortcircuited)
AttE 206 Cascade probe error
(contact open or shortcircuited)
System with appliances in a cascade. The cascade
management system has lost the connection with
one of the appliances. Possible causes:
a - one of the appliances in the cascade is OFF;
b - the communication BUS between the appliances
(A-Link) is interrupted in one or more points;
c - parameters 4184 and/or 4147 are not set accord-
ing to the rules in section 5.15;
d - the S4 switches are not positioned as described
in section 5.15;
N/A Replace the command and control board
N/A Replace the command and control board
Check the electrical resistance of the sensor;
Check that it has been connected correctly.
Check the electrical resistance of the sensor;
Check that it has been connected correctly.
N/A Replace the command and control board
a - switch the appliance off by resolving the problem
that caused it to shut down;
b - restore the BUS communication between the
appliances;
C - set parameters 4184 and/or 4147 correctly, ac-
cording to the rules in section 5.15
d - position the S4 switches as described in section
5.15.
If the electric resistance does not match, replace it. If
the electric circuit is damaged, repair it. Where neither
of the two previous cases apply, replace the command and control board.
If the electric resistance does not match, replace it. If
the electric circuit is damaged, repair it. Where neither
of the two previous cases apply, replace the command and control board.
COSMOGAS
65
MYDENS
Page 66
8 - MAINTENANCE
8.1 - General recommendations
Perform regular yearly maintenance on the central heating
system for the following reasons:
- to maintain high efciency and save fuel;
- to maintain a high level of safety;
- to maintain the high level of combustion environmental
compatibility;
In order to maintain the frequency of maintenance, there
is a parameter 2203 in the installer menu (see section
7.16), which is used to activate the maintenance call
(Service), along with parameter 2204 which is used to
set the operating days that must pass between one call and
the next.
The control system identies the operating days, checking
the burner activity time.
Proceed as follows to activate the call service:
1.- Access the Installer prole (see section 7.16) and set
parameter 2203 to 0n;
2.- Access parameter 2204 and set the boiler operating
days which must pass between one call and the next.
The call will be executed with the message “SEr” on the
display. To remove the message “SEr” and renew the call
period, do as follows:
1.- Access the “Installer” prole;
2.- Access parameter 2203 and set it to rSt.
The call time has now been reset and the message “SEr”
appears on the display.
WARNING! Appliance maintenance must
be carried out only by a professionally qualied
technician.
WARNING! During maintenance operations,
to ensure the appliance operates correctly, check
its condition and operation, and check for any water
leakages from any of the air vent valves on the
appliance.
WARNING! Before any maintenance work,
disconnect the appliance from the electrical power
supply, using the relevant switch nearby.
MYDENS
WARNING! Close the gas cock before any
maintenance work
66
COSMOGAS
Page 67
8 - MAINTENANCE
8.2 - Maintenance protocol
- Clean the burner and the primary heat exchanger (fumes side); check the condition of the thermal insulators and seals
(See section 8.5);
- Check the system water pressure; check for leaks
(See section 8.2.1);
- Check the gas supply pressure; check for gas leaks
(Follow sections 6.6 and 8.2.2);
- Check and clean the condensate drain system
(See section 8.10);
- Check the condition of the safety valve
(See section 8.2.3);
- Check the condition of the expansion tank
(See section 8.9);
- Check the condition of the safety and control devices
(See section 8.2.4);
- Check the condition of the electrical system
(See section 8.2.5);
- Check the burner is calibrated correctly in DHW and heating mode
(See section 6.7);
- Check the operation of the main switch and the temperature setting in DHW and heating mode
(See sections 8.2.6 and 8.2.7);
- Check that the device against the lack of gas is triggered and check the intervention time
(See section 8.2.8);
- Check the condition of the air intake and ue exhaust ducts
(See section 8.2.9);
- Check the ignition and detection electrodes
(See sections 8.2.10 and 8.6);
- Check the condition and operation of the air vent valves
(See section 8.2.11);
- Check the appliance efciency
(See section 8.23);
8.2.1 - Checking the system water
pressure and any leaks
1. - Check that the system is full of water and pressurised
as reported in section 9 “Technical data”. Check the
system when cold and after each time the system is
lled.
2. - Check for leaks in the hydraulic connections.
WARNING! Remove any leaks from the system
or the appliance. Continuously adding new water leads
to increased minerals that reduce the cross-section of
the passage, decreasing heat exchange and causing
the heat exchangers to overheat. All of this leads to
failures and reduces the appliance life.
8.2.2 - Checking the gas pressure and any
leaks
1.- Check the gas supply pressure is correct, as stated in
section 9 “Technical data”.
2. - Make sure there are no gas leaks in the system;
3. - Check for gas leaks using a leak detector (bubble or
similar) or an equivalent system, thoroughly checking the
entire gas route from the meter to the appliance.
WARNING! Do not carry out these checks in the
presence of naked ames.
8.2.3 - Checking the condition of the safety
valve
1. - Visually check that the safety valve does not have any
obstructions in the drain pipe, signs of corrosion, physical
damage, water marks or signs of rust.
2. - In case of obstructions in the drain pipe proceed with
cleaning the pipe; in case of other damage indicated
above proceed with replacing the valve.
COSMOGAS
67
MYDENS
Page 68
8 - MAINTENANCE
8.2.4 - Checking the condition of the safety
and control devices
1. - Check any interventions of the safety and control
devices by consulting the appliance diagnostics;
2. - Visually check that the safety and control devices show
no signs of corrosion or physical damage;
3. - In case of damage as indicated above, replace the
devices.
8.2.5 - Checking the condition of the
electrical system
1. - Access the internal electrical components as per
section 8.3.
2. - Visually check that the cables are correctly housed
in the relative cable glands, and that the plug-in
connections are xed correctly and do not show signs of
blackening or burns.
3. - In case of damage as indicated above, replace the
damaged cables.
8.2.6 - Checking the operation of the main
switch
1. - Check that the appliance is switched off when the main
switch is set to OFF and vice versa that the appliance is
switched on when it is turned ON.
2. - In case of a malfunction, replace the switch.
8.2.9 - Checking the condition of the air
intake and ue exhaust ducts
1. - Check that the air intake and ue exhaust ducts are
not obstructed, and show no signs of corrosion, physical
damage, water marks or signs of rust.
2. - Make sure the externally assembled intake grids and
ue exhaust outlets do not have any residue and are
clean.
8.2.10 - Checking the ignition and
detection electrodes
1. - Remove the burner fan unit (as shown in section 8.4).
2. - Clean any material build-up from the electrodes.
3. - Make sure the electrodes are in the correct position as
shown in section 8.6.
8.2.11 - Checking the condition of the air
vent valves
1. - Visually check that the air vent valves are not
obstructed in the drain pipe, and show no signs of
corrosion, physical damage, water marks or signs of rust.
2. - In case of obstructions in the drain pipe, clean the pipe;
in case of other damage indicated above, replace the
valve.
8.2.7 - Checking the correspondence of
the adjusted temperatures in the heating
and domestic hot water systems
1. - Check the correspondence between the real and set
temperatures in heating mode and in DHW mode.
2. - If the temperatures do not correspond, replace the
interested sensor. If the problem persists, replace the
command and control board.
8.2.8 - Checking if the device is triggered
in case of gas failure
1. - Check that after attempts to start the appliance, with the
gas shut-off valve closed, the appliance goes into lockout
mode and the “Loc 1” message appears on the display.
2. - If the lock message does not appear, replace the
command and control board.
MYDENS
68
COSMOGAS
Page 69
8 - MAINTENANCE
8.3 - Removing the casing and
accessing the internal components
WARNING! If the cover is installed externally,
remove it following the instructions in section 5.18 of
this manual.
To dismantle the casing, proceed as follows (refer to gure
8-1):
1.- Pull the lower cover “A” towards the front by about 10 mm;
2.- Push the lower cover “A” downwards;
3.- Unscrew screws “H”;
4.- Pull the lower part of the front-piece “B” towards the
front and then slide upwards until it is released from the
guides “C”;
To access the command and control board:
1.- Turn the command board “D” towards the front;
2.- Open the command board “D” using closing mechanism
“G”
To access the electrical connections board:
020002.01.018
F
F
F
G
1.- Turn the command board “D” towards the front;
2.- Slide cover “E” out using the closing aps “F”;
C
E
D
B
A
H
Figure 8-1 – Removing the casing and opening the command board
COSMOGAS
69
MYDENS
Page 70
8 - MAINTENANCE
8.4 - Dismantling the
burner fan assembly
Proceed as follows to remove the burner fan unit (refer to
gure 8-2 when not specied otherwise):
1.- Access the internal components following section 8.3;
2.- Remove the air manifold (detail “C” in gure 6-2) rotating
it towards the outside of the boiler and then pulling it
towards the right (see gure 6-2);
3.- Unscrew nut “C” from valve “D”;
4.- Disconnect cables “B” and the detection cable from the
ignition and detection electrodes (details “12”, and “53” in
gures 3-1 and 3-2);
5.- Unscrew the four nuts “E”;
6.- Extract the assembly “F” as per gure;
GASKET
020009.01.032
BURNER UNIT
8.5 - Cleaning the burner and the
primary heat exchanger (fumes side)
To correctly clean the burner and heat exchanger body
(fumes side), proceed as follows (refer to gure 8-2 when
not specied otherwise):
1.- Access the internal components following section 8.3;
2.- Remove the burner unit following section 8.4;
3.- Pass a cylindrical brush with plastic bristles inside the
combustion chamber;
4.- Using a suction device, suck up the unburnt residues
found inside the combustion chamber;
5.- Use the same device on the surfaces of the burner and
around the electrodes;
6.- Rinse the heat exchanger with clean water to remove
residues and check that the space between the
exchanger elements is not clogged (the water must
naturally ow into the condensate siphon);
7.- Visually check that the burner and the combustion
chamber are in good condition;
WARNING! Every time the burner and the primary
heat exchanger are cleaned, check that thermal insulation
elements “G” and “H” are in good condition. If necessary,
replace with burner along with gasket “L”. Request the
kit with code 62632006.
8.- Reassemble the components in reverse order, checking
that the gaskets are in good condition and replacing
them where necessary;
WARNING!
The gasket ensures the
combustion chamber is sealed. If the gasket is
damaged DO NOT reuse it, it must be replaced
along with the burner unit. Consult the
manufacturer for information on replacing it.
E
F
WARNING! The gasket on the burner door,
irrespective of its condition, must be replaced at least
every two years.
9.- Open the gas cock;
10.- Reconnect the electric power supply;
11.- Check that there are no gas leaks between the joints
removed.
WARNING! Perform the gas leak test using a
soap and water solution only. The use of naked ames
is prohibited.
H
L
B
G
Figure 8-2 – Removing the burner fan unit
MYDENS
D
C
A
020002.01.024
70
COSMOGAS
Page 71
8 - MAINTENANCE
8.6 - Correctly positioning the
ignition and detection electrodes
For the appliance to work well, the electrodes must be
positioned correctly (refer to gure 8-3):
- the distance between ignition electrodes “A” and “B” must
be between 2.0 and 2.5 mm;
- the distance of the ignition electrodes from the surface of
the burner must be between 5 and 5.5 mm;
- the distance of the detection electrodes from the surface of
the burner must be between 5.5 mm and 6.5 mm.
8.7 - Dismantling the ignition
and detection electrodes
If the ignition and/or detection electrodes need replacing,
proceed as follows:
1.- Close the gas supply;
2.- Turn off electricity to the boiler;
3.- Access the components inside the appliance, following
section 8.3;
4.- Remove the burner fan unit as shown in section 8.4;
5.- Disassemble the electrodes to be replaced “B” or “E” by
means of screws “A” or “D” in gure 8-4, taking care to
remove seals “C” and “F”;
6.- Assemble the new electrodes with the new gaskets “C”
and “F” supplied with the replacement kits;
7.- Check the electrodes are in the correct position as per
section 8.6;
8.- Ret the rest of the components in reverse order;
9.- Open the gas cock;
10.- Connect the boiler to the electric power supply;
11.- Check for any gas leaks using the relevant tools;
WARNING! Perform the gas leak test using a
soap and water solution only. The use of naked ames
is prohibited.
Figure 8-3 – Positioning the electrodes on the
burner
C
F
E
B
A
D
020025.01.004
Figure 8-4 – Removing the electrodes
COSMOGAS
71
MYDENS
Page 72
8 - MAINTENANCE
8.8 - Dismantling and
replacing the gas valve
WARNING! After this operation, run the self-
calibrating procedure (see section 6.6).
If the gas valve needs replacing, proceed as follows:
Refer to gure 8-5 when not specied otherwise.
1.- Close the gas supply;
2.- Turn off electricity to the boiler;
3.- Access the components inside the appliance, following
section 8.3;
4.- Detach the power cable from gas valve “D”;
5.- Remove the gas inlet pipe via the two ttings “A” and
“B”;
6.- Remove the clamp spring “C”, releasing gas valve “D”;
7.- Slide off the gas valve “D” upwards;
8.- Using screws “F”, remove bend “G” from the gas valve;
9.- Fit curve “G” on the new gas valve, taking care to
position gasket “H” (supplied in the kit) correctly in the kit;
the one removed previously can be disposed of;
10.- Ret the appliance back together by performing the
operations above in reverse order;
11.- Open the gas cock;
12.- Connect the boiler to the electric power supply;
13.- Check for any gas leaks using the relevant tools;
WARNING! Perform the gas leak test using a
soap and water solution only. The use of naked ames
is prohibited.
C
B
020025.01.005
D
A
NO
020022.01.008
YES
M
H
G
F
Figure 8-5 – Access to the expansion tank
MYDENS
72
020025.01.040
COSMOGAS
Page 73
8 - MAINTENANCE
8.9 - Checking the expansion tank
The expansion tank is positioned on the left side of the
boiler.
Check the pre-ll pressure of the expansion tank. It must be
at 1 bar. If the pressure is lower, increase it as follows:
1.- Convey the exhaust pipes “A” and “B” in gure 8-18 to a
drain, using a rubber hose;
2.- Open the exhausts until the pressure on the appliance
display is “0”;
3.- Use pin “F” in gure 8-6 to pump air into the tank until it
reaches 1 bar. At the same time, allow water to ow from
exhausts “A” and “B” in gure 8-18;
4.- Close exhausts “A” and “B” in gure 8-18;
5.- Restore the pressure in the central heating system as
per section 7.2.
If the tank needs replacing, proceed as follows to remove it
(refer to gure 8-6 when not specied otherwise):
1.- Access the components inside the appliance, following
section 8.3;
2.- Empty the central heating circuit, following the
procedure in section 8.19;
3.- Remove screws “B”;
4.- Loosen tting “C”;
5.- Extract the expansion tank “D” towards the front;
6. - Replace the tank.
7.- Restore the pressure in the central heating system as
per section 7.2.
D
B
F
E
C
A
020002.01.025
Figure 8-6 – Access to the expansion tank
COSMOGAS
73
MYDENS
Page 74
8 - MAINTENANCE
020025.01.027
Figure 8-7 – Removing the condensate collection
siphon
8.10 - Cleaning the condensate
conveyor siphon
For correct cleaning of the collection siphon and conveying
of the condensate produced by combustion, operate as
follows (refer to the gures 8-7, 8-8 and 8-9):
1.- With the boiler on, open a domestic hot water cock fully
so that the burner runs at maximum power and the level
of liquid inside the siphon tank “D” lowers (see gure
A
8-8);
2.- Access the internal components as described in section
D
8.3;
C
3.- Remove the burner fan unit as described in section 8.4;
4.- Remove the servomotor as described in section 8.14;
B
5.- Cover the electric system and pump unit with a cloth to
protect them from any water residue inside the siphon to
be removed;
6.- Slide support “C” outwards from the holding support;
7.- Slide tank “D” downwards carefully as it is full of
condensate water which could leak;
8.- Extract the siphon by moving it outwards (see gure
8-8), taking care to disconnect the collection pipes for the
water coming from the upper part of the appliance and
from the air vent valve;
9.- Clean the decanting tank “D”;
10.- Ret everything in reverse order, making sure gasket
“E” is put back in the relevant place and that end “G” is
correctly positioned correctly in “H”;
11.- Restore the level of liquid inside the siphon, following
the procedure in section 6.1.2.
020025.01.029
E
D
E
D
F
020002.01.030
G
H
Figure 8-8 – Removing the condensate collection
siphon
MYDENS
Figure 8-9 – Condensate collection siphon
74
COSMOGAS
Page 75
8 - MAINTENANCE
C
020025.01.035
Figure 8-10 – Removing the air vent valve
8.11 - Removing the air vent valve
A
Refer to gure 8-10 and proceed as follows:
1.- Empty the central heating circuit, following the
procedure in section 8.19;
2.- Access the components inside the appliance, following
section 8.3;
3.- Remove pipe “A” from the air vent valve “B”;
4.- Slide drive bar “C” towards the front;
5.- Slide air vent valve “B” upwards and extract it.
B
8.12 - Replacing the pump motor
If the circulation pump needs replacing, operate as follows
(refer to gure 8-11):
1.- Empty the central heating circuit, following the
procedure in section 8.19;
2.- Access the components inside the appliance, following
section 8.3;
3.- Disconnect the electric wires from the pump body;
4.- Remove screws “B”;
5.- Extract pump “C” by sliding it outwards;
6.- Replace the pump motor.
8.13 - Removing the central
heating circuit pressure sensor
Proceed as follows, making reference to gure 8-12:
1.- Empty the central heating circuit, following the
procedure in section 8.19;
2.- Access the components inside the appliance, following
section 8.3;
3.- Extract drive bar “A” towards the front;
4.- Slide pressure sensor “B” upwards and extract it.
020025.01.026
Figure 8-11 – Replacing the pump motor
B
A
020025.01.036
BAC
Figure 8-12 – Removing the central heating circuit
pressure sensor
COSMOGAS
75
MYDENS
Page 76
8 - MAINTENANCE
C
B
F
A
020025.01.033
020025.01.031
Figure 8-13 – Removing the servomotor
G
8.14 - Removing the diverter
valve servomotor
Proceed as follows, making reference to gure 8-13:
1.- Access the components inside the appliance, following
section 8.3;
2.- Remove the air manifold (detail “C” in gure 6-2) rotating
it towards the outside of the boiler and then pulling it
B
towards the right (see gure 6-2);
3.- Slide drive bar “A” outwards as in gure 8-13;
4.- Extract servomotor “B” upwards as in gure 8-13.
A
8.15 - Removing the diverter valve
The diverter valve (detail “47” in gure 3-2) switches the
ow of water produced by the primary heat exchanger
to the central heating circuit or to the secondary heat
exchanger for the production of DHW. If it needs to be
replaced, proceed as follows (refer to gure 8-14):
1.- Remove the diverter valve servomotor following section
8.14;
2.- Empty the central heating circuit, following the
procedure in section 8.19;
3.- Slide the drive bar “D” outwards;
4.- Slide diverter valve “E” upwards.
020025.01.032
H
D
Figure 8-14 – Removing the diverter valve
E
8.16 - Removing the ow meter
The ow meter is used to measure the domestic hot water
ow rate. If it needs to be replaced, proceed as follows
(refer to gure 8-15):
1.- Empty the domestic hot water circuit, following the
procedure in section 8.20;
2.- Access the components inside the appliance, following
section 8.3;
3.- Remove spring “A”;
4.- Remove owmeter “B”;
5.- Clean lter “C” making sure to extract it from the body of
ow meter “B” as indicated in the gure;
6.- Wash the lter and ret everything in reverse order;
7.- When retting the ow meter, the two tabs (detail “F”
in gure 8-15) must be slotted into the respective holes
in the hydraulic unit (the largest towards the front of the
appliance and the small one at the rear).
WARNING! This lter is intended as a precaution
only. A lter with greater capacity must be installed
outside the boiler, on the cold water inlet, as specied
in section 5.6.
Figure 8-15 – Removing the ow meter
MYDENS
76
COSMOGAS
Page 77
8 - MAINTENANCE
A
B
D
C
020025.01.034
Figure 8-16 – Removing the safety valve
8.17 - Removing the safety valve
The safety valve (detail “D” in gure 8-16) protects the
appliance against overpressure. If it needs to be replaced,
proceed as follows (refer to gure 8-16):
1.- Empty the central heating circuit, following the
procedure in section 8.19;
2.- Access the components inside the appliance, following
section 8.3;
3.- Disconnect drain pipe “A”, loosening the sealing spring
“B”;
4.- Slide drive bar “C” towards the front;
5.- Extract the safety valve “D” lifting it upwards;
8.18 - Secondary heat exchanger
for the production of DHW
The production of DHW is delegated to the secondary heat
exchanger (detail “5” in gure 3-1). If this heat exchanger
stops being efcient, it may require cleaning or replacement.
To remove the secondary heat exchanger, proceed as follows
(refer to gure 8-17):
1.- Empty the central heating circuit and the domestic
hot water circuit, following sections 8.19 and 8.20
respectively;
2.- Access the internal components as per section 8.3;
3.- Remove the burner fan unit as shown in section 8.4;
4.- Remove the siphon as described in section 8.10;
5.- Unscrew bolts “A”;
6.- Move the secondary heat exchanger “B” backwards and
turn it as per gure;
7.- Extract the heat exchanger “B” towards the front of the
boiler.
020025.01.037
Figure 8-17 – Removing the secondary heat
exchanger
COSMOGAS
77
B
A
MYDENS
Page 78
8 - MAINTENANCE
8.19 - Emptying the appliance
on the central heating side
To empty the appliance from the central heating side,
proceed as follows:
1.- Generate a central heating request;
2.- Set the central heating temperature at the lowest value
possible to cool the water inside the boiler;
3.- Switch the appliance off;
4.- Access the internal components, following the procedure
in section 8.3;
5.- Connect a hose to drain cocks “A” and “B” (see gure
8-18) and convey it to a sink drain or similar;
6.- Open drain cocks “A” and “B” (see direction of rotation in
gure 8-19);
7.- Open the air vent valves of the heating elements. Start
from the highest central heating elements and continue
with the lowest.
8.- Once all of the water has been evacuated, close all of
the heating element vent valves and drain cocks “A” and
“B” in gure 8-18.
WARNING! Do not salvage or reuse the water
evacuated from the central heating circuit for any
purpose as it could be polluted.
8.21 - Minimum and maximum power
To force operation at the appliance’s minimum, maximum, set
or ignition power, proceed as follows:
1.- Make sure that any cocks and thermostatic valves after
the central heating circuit are open;
WARNING! When forcing the delivery
temperature, it automatically goes to 93°C to dispose
of as much of the heat generated by the boiler as
possible. Check that the central heating system can
support this temperature.
2.- Access parameter 0200, which can be viewed and
changed from the “Installer prole” (see section 7.16);
3.- Set parameter 0200 to the following value:
a) LO to force the boiler to minimum power;
b) Ign to force the boiler to ignition power;
c) HI to force the boiler to maximum power;
d) rEg to force the boiler to the maximum central heating
power, as set (Range Rated) in section 6.8, parameter
2014.
4.- To end forcing, set parameter 0200 to 0FF and press
the RESET key.
8.20 - Emptying the appliance on
the domestic hot water side
To empty the appliance from the domestic hot water side,
proceed as follows:
1.- Close the main cold water supply cock in the house;
2.- Open all hot and cold water taps in the house;
3.-Mmake sure that at least one of these is at a height
below the level of the boiler.
WARNING! If during forcing, the power supplied
by the boiler is much higher than the power absorbed
by the system, the boiler switches off continuously to
reach the maximum temperature allowed (93°C).
Forcing lasts 10 minutes, after which the appliance
returns to normal operating conditions.
020002.01.038
BA
Figure 8-18 – Heating circuit drain valves
MYDENS
BA
Figure 8-19 – Opening and closing direction of cocks
A = Open
B = Closed
78
COSMOGAS
Page 79
8 - MAINTENANCE
8.22 - Checking the ionisation current
In any operating status, including during checks on the
minimum and maximum power stated in section 8.21, the
ionisation current value can be consulted at parameter
1008 from any prole. This value must be between 4 and
7 uA (microampere).
8.23 - Checking combustion efciency
According to national laws on gas appliances, it is
necessary to periodically check the combustion efciency;
To do this, operate exactly as stated in section 6.7 and
check, along with the CO2, the combustion efciency
at full load (80/60), which must be over the regulatory
requirements.
Figure 8-20 - Water sensors curve
8.24 - Water temperature
measurement sensors
Various temperature sensors are positioned on the heat
exchanger body. The electrical resistance between the two
sensor contacts must correspond to gure 8-20.
The temperature sensors are: 1001, 1002, 1005,
1006, and 1007. Check their positioning in gures 3-1
and 3-2.
8.25 - External temperature sensor
On request, the external temperature sensor can be
connected to the boiler 1004 (see section 5.14.5). The
electrical resistance between the two sensor contacts must
correspond to gure 8-21.
Figure 8-21 - External temperature sensor curve
COSMOGAS
79
MYDENS
Page 80
8 - MAINTENANCE
8.26 - Wiring diagram
Figure 8-22 – Wiring diagram
MYDENS
80
COSMOGAS
Page 81
8 - MAINTENANCE
1 - Electric connections board
2 - Master switch;
3 - DHW output sensor (1002) *
4 - Diverter valve
5 - Fan
6 - Gas valve
7 - Spark generator
8 - Pump
9 - Ionisation electrode
10 - Command and control board
11 - Display
12 - Return sensor (1007)
13 - Fumes temperature sensor (1006)
14 - Water pressure sensor (1033)
15 - Water pressure sensor (1062)
16 - Double supply temperature sensor
17 - Flue safety fuse
18 - Heat exchanger fuse
19 - System ll solenoid valve
20 - Slave appliance BUS
21 - Cascade sensor (1015)
22 - Master appliance BUS
COSMOGAS
23 - Ambient thermostat (TA)/ CR04 remote control/ Cosmobit
24 - 0-10 VDC communication
25 - External sensor (SE)
26 - Indirect water heater sensor (SB) (1002) **
27 - Alarm output/ Automatic ll
28 - External pump
29 - External diverter valve
30 - Line
31 - Neutral
* Not present with indirect
water heater;
** Only with indirect water heater;
WARNING! To facilitate
consultation, K references are
given in the wiring diagram
followed by a number (see
example above). This is to identify
the correct follow-on of the cables
on the next page.
81
MYDENS
Page 82
9 - TECHNICAL DATA
MYDENS TECHNICAL DATA UM 15 24 34
Type (Type of fumes exhaust/air intake) B23; B23P; C13; C33; C43; C53; C63; C83; C93
Category II2H3P II2H3P II2H3P
EU type approval certicate (PIN) 0476CQ1097 0476CQ1097 0476CQ1097
Range Rated Boiler APPROVED APPROVED APPROVED
Central heating max. heat input “Qn” PCI (PCS) kW 14.0 (15.5) 25.5 (28.3) 32.0 (35.5)
Domestic hot water max. heat input “Qn” PCI (PCS) kW / 25.5 (28.3) 32.0 (35.5)
Heating min. heat input PCI (PCS) kW 3.2 (3.6) 3.2 (3.6) 6.0 (6.7)
Domestic hot water min. heat input PCI (PCS) kW / 3.2 (3.6) 6.0 (6.7)
Central heating max. useful output power (80/60) “Pn” kW 13.6 24.8 30.9
Efciency at 100% load (80/60) % 96.5 (86.9) 97.2 (87.6) 96.8 (87.2)
Min. useful output power (80/60) kW 3.02 3.02 5.75
Efciency at min. useful output power (80/60) % 94.5 (85.1) 94.5 (85.1) 95.8 (86.3)
Central heating max. useful output power (50/30) kW 14.9 27.0 33.5
Efciency at central heating max. useful output power (50/30) PCI (PCS) % 106.5 (96.0) 105.7 (95.2) 104.7 (94.3)
Min. useful output power (50/30) kW 3.30 3.30 6.14
Efciency at min. useful output power (50/30) PCI (PCS) % 103.0 (92.8) 103.0 (92.8) 102.4 (92.3)
Efciency at 30% of the load PCI (PCS) % 107.5 (96.8) 108.5 (97.7) 107.0 (96.4)
Losses at the chimney, burner ON (80/60) % 1.5 1.5 1.5
Losses at the chimney, burner ON at minimum power % 0.5 0.5 0.5
Losses at the chimney, burner OFF % 0.1 0.1 0.1
Losses at the casing, burner ON (80/60) % 0.5 0.5 0.5
Losses at the casing, burner OFF % 0.1 0.1 0.1
Losses at zero load % 0.3 0.3 0.3
G20 m
Gas ow rate
Gas supply pressure
Gas supply minimum pressure
Gas supply maximum pressure
Primary heat exchanger water content lt 2.9 2.9 2.9
Secondary heat exchanger water content lt / 0.5 0.5
Domestic hot water useful output power kW / 27.0 33.5
DHW minimum ow rate l/min / 2 2
Instantaneous DHW production (dt 30°C) l/min / 12.9 16.0
Instantaneous DHW adjustment range °C / 40-60 40-60
DHW adjustment range with indirect water heater °C 40-70 40-70 40-70
Design temperature °C 95 95 95
Maximum central heating temperature °C 80 80 80
Minimum central heating temperature °C 20 20 20
G25 m
G30 kg/h 1.10 2.01 2.52
G31 kg/h 1.09 1.98 2.48
G20 mbar 20 20 20
G25 mbar 25 25 25
G30 mbar 30 30 30
G31 mbar 37 37 37
G20 mbar 17 17 17
G25 mbar 20 20 20
G30 mbar 25 25 25
G31 mbar 25 25 25
G20 mbar 25 25 25
G25 mbar 30 30 30
G30 mbar 35 35 35
G31 mbar 45 45 45
3
/h 1.48 2.70 3.38
3
/h 1.72 3.14 3.94
MYDENS
82
COSMOGAS
Page 83
9 - TECHNICAL DATA
MYDENS TECHNICAL DATA UM 15 24 34
Maximum central heating pressure “PMS” bar 3 3 3
Minimum central heating pressure bar 0.5 0.5 0.5
Maximum DHW circuit pressure “PMW” bar / 7 7
Minimum DHW pressure bar / 0.3 0.3
Expansion tank pre-load pressure bar 1 1 1
Expansion tank capacity lt 10 10 10
Rated power supply voltage V ~ 230 230 230
Rated power supply frequency Hz 50 50 50
Absorbed electrical power W 120 120 120
Electrical protection rating IPX4D IPX4D IPX4D
Burner electrical power W 70 70 70
Electrical power absorbed by the pump W 50 50 50
Air intake/ fumes exhaust pipe diameter (split) mm 80 80 or 50 80 or 50
Air intake pipe max. length (split) (80) or (50) m 20 (20) or (7*) (12.5) or (3*)
Fumes exhaust pipe max. length (split) (80) or (50) m 20 (20) or (7*) (12.5) or (3*)
Minimum usable diameter of collective aspiration duct (type C93) mm 100 100 100
Fumes pipe diameter (coaxial) mm 60/100 60/100 60/100
Fumes pipe max. length (coaxial) m 10 10 10
Equivalent length of a bend m 45° bend = 0.5 m, 90° bend = 1 m
Weighted CO (0% O2) G20 ppm 5 20 25
Weighted NOx (0% O
CO2 (%) at minimum/maximum power
O2 (%) at minimum/maximum power
Maximum recirculation of fumes in windy conditions % 10 10 10
Maximum fumes temperature at boiler outlet °C 80 80 80
Minimum fumes temperature at boiler outlet °C 30 30 30
Δt fumes temperature/Return (at 100% of the load) (80/60) °C 7 15 28
Δt fumes temperature/Return (at 30% of the load) (37/30) °C 8 5 3
Maximum CO in exhaust fumes ppm 250 250 250
Mass ow of fumes at maximum power g/s 6.4 11.6 14.6
Mass ow of fumes at minimum power g/s 1.5 1.5 3.4
Head available at exhaust Pa 90 90 90
Maximum temperature of the combustion agent air °C 50 50 50
Maximum CO2 content in the combustion agent air % 0.9 0.9 0.9
Maximum fumes temperature for overheating °C 95 95 95
Max. negative pressure allowed in the fumes exhaust/air intake system Pa 90 90 90
Condensate maximum ow rate l/h 1.9 3.2 4.0
Condensate average acidity PH 4 4 4
Operating room temperature °C 0.5 ; 50 0.5 ; 50 0.5 ; 50
Boiler weight
) (Class 6 EN 15502) PCS G20 mg/kWh 25 31 24
2
G20 % 8.5/9.0 8.5/9.0 8.5/9.0
G25 % 8.5/9.0 8.5/9.0 8.5/9.0
G30 % 9.5/10.4 9.5/10.5 9.5/10.5
G31 % 10.0/10.4 9.5/10.5 10.0/10.5
G20 % 5.8/4.9 5.8/4.9 5.8/4.9
G25 % 5.4/4.5 5.4/4.5 5.4/4.5
G30 % 6.7/5.2 6.7/5.2 6.7/5.2
G31 % 5.6/4.9 6.4/4.9 5.6/4.9
B kg 38 38 38
C kg 36 36 36
P kg / 38 38
* In these conditions, the appliance power is reduced by 10%
COSMOGAS
83
MYDENS
Page 84
10 - COMMAND MENU DIAGRAM
Accessing the menus Navigating the menus
Parameters
that can
be displayed
in normal operating
conditions
(see section 7.17)
Menu
Changing parameters
Example of
0.000 menu
parameters
(see section
7.16)
Return to normal operation
Return to normal operation
Figure 10-1 - Command menu diagram
Example of
0.200 menu
parameters
(see section
7.16)
MYDENS
84
COSMOGAS
Page 85
11 - EU DECLARATION OF CONFORMITY
The undersigned company COSMOGAS S.r.L., with registered ofce in Via
L. Da Vinci no. 16 - 47014 Meldola (FC) ITALY,
DECLARES
under its own responsibility that the product:
SERIAL No.
MODEL
PRODUCTION
that is the subject of this declaration, complies with the model described in EU
Type Test Certicate, issued by the notied body Kiwa Cermet Italia S.p.A.,
whose data are given in the table shown in the TECHNICAL DATA section under
the heading “ EC type approval certicate (PIN)”, and fulls the requirements
of the EU Regulation on Gas Appliances, (2016/426), the Efciency Directive,
(92/42/EEC modied by Reg. (EU) 813/2013), the Low Voltage Directive,
(2014/35/EU), and the Electromagnetic Compatibility Directive,
(2014/30/EU).
Monitoring of the product was carried out by the notied body shown on form “C”.
(The warranty number corresponds to the serial number)
This declaration is issued as stipulated by the aforementioned directives.
Meldola (FC) ITALY, (Date of construction).
COSMOGAS
85
________________________
Alessandrini Arturo
Sole Director
MYDENS
Page 86
12 - ErP PRODUCT SHEET
Name or brand of the supplier ADVECO ADVECO
Supplier’s model number
Condensing boiler YES YES YES YES YES YES YES YES
Low-temperature boiler NO NO NO NO NO NO NO NO
B1 boiler NO NO NO NO NO NO NO NO
Cogeneration space heater NO NO NO NO NO NO NO NO
Combination heater NO NO NO NO YES NO NO YES
Equipped with supplementary heater NO NO NO NO NO NO NO NO
Energy efciency class A A A A A A A A
Item Symbol Unit
Rated heat output Pn kW 13.6 13.6
Seasonal space heating energy efciency ηs % 91.6 91.6 92.5 92.5 92.5 91.2 91.2 91.2
Useful output power at rated heat output in high-temperature regime (*) P4 kW 13.6 13.6 24.8 24.8 24.8 30.9 30.9 30.9
Useful efciency at rated heat output in high-temperature regime (*) η4 % 86.9 86.9 87.6 87.6 87.6 87.2 87.2 87.2
Useful output power at 30% of rated heat output in low-temperature regime
(**)
P1 kW 4.5 4.5 8.3 8.3 8.3 10.4 10.4 10.4
15 B 15 C 24 B 24 C 24 P 34 B 34 C 34 P
MYDENS
Useful efciency at 30% of rated heat output in low-temperature regime (**) η1 % 96.8 96.8 97.7 97.7 97.7 96.3 96.3 96.3
Auxiliary electricity consumption
At full load elmax kW 0.07 0.07
At partial load elmin kW 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03
In standby mode Psb kW 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005
Other factors
Standby heat loss Pstby kW 0.1 0.1
Ignition burner power consumption Pign kW 0 0 0 0 0 0 0 0
Annual energy consumption QHE GJ 26 26
Sound power level, indoors/outdoors LWA dB 49 49 51 51 51 52 52 52
Emissions of nitrogen oxides NOx mg/kWh 25 25 31 31 31 24 24 24
Domestic hot water parameters
Declared load prole N/A N/A
DHW production efciency ηwh % N/A N/A N/A N/A 85.6 N/A N/A 87.0
Daily consumption of electrical energy Qelec kWh N/A N/A N/A N/A 0.165 N/A N/A 0.179
Annual consumption of electrical energy AEC kWh N/A N/A N/A N/A 36 N/A N/A 39
Daily consumption of fuel Qfuel kWh N/A N/A N/A N/A 21.865 N/A N/A 27.710
Annual consumption of fuel AFC GJ N/A N/A N/A N/A 17 N/A N/A 22
According to Regulations (EU) no. 811/2013 and no. 813/2013.
N/A = Not applicable.
(*) High-temperature regime means 60°C return temperature and 80°C supply temperature.
(**) Low-temperature regime for condensing boilers means 30°C, for low-temperature boilers, 37°C,
and for other appliances, 50°C return temperature
MYDENS
86
COSMOGAS
Page 87
MYDENS
24.8 24.8 24.8 30.9 30.9 30.9
0.07 0.07 0.07 0.07 0.07 0.07
0.1 0.1 0.1 0.1 0.1 0.1
43 43 43 57 57 57
N/A N/A XL N/A N/A XXL
COSMOGAS
87
MYDENS
Page 88
To contact technical support
Unit 7&8 Armstrong Mall, Southwood Business Park
Farnborough, Hampshire GU14 0NR
PHONE 01252 551 540
enquiries@adveco.co
www.adveco.co
Loading...