Unical MODULEX EXT Series Technical specifications

ENGLISH
100 - 116 - 150 - 200 - 250 - 300 - 350
MODULEX EXT
INSTALLATION AND MAINTENANCE INSTRUCTIONS

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https://www.unicalag.it/prodotti/professionale-300/commercial-condensazione-alluminio/347/modulex-ext
Provisions for proper disposal of the product
After decommissioning, this appliance must not be disposed of as mixed urban waste.
Separate waste collection is mandatory for this type of waste, in order to allow the recovery and reuse of the
materials making up the appliance.
Please contact operators authorised for the disposal of this type of appliances
Incorrect management of waste and of its disposal has potential negative e󰀨ects on the environment and human health
The symbol on the appliance, represents the prohibition to dispose of the product as mixed urban waste.

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Installation instructions Technical Features General information
Maintenance instructions
ENGLISH
4 INSPECTION AND MAINTENANCE................................................................................................................................42
4.1 Inspection and maintenance instructions..................................................................................................................42
4.2 Wiring diagram..........................................................................................................................................................48
3 INSTRUCTIONS FOR THE INSTALLER .........................................................................................................................16
3.1 General warnings......................................................................................................................................................16
3.2 Installation rules ........................................................................................................................................................16
3.3 Preventive system verication and adjustment operations .......................................................................................16
3.4 Package and Weights ..............................................................................................................................................17
3.5 Positioning in boiler room..........................................................................................................................................18
3.6 Flue gas exhaust pipe connection.............................................................................................................................19
3.7 Connection reversibility.............................................................................................................................................20
3.8 Connection................................................................................................................................................................21
3.9 Filling and emptying the system................................................................................................................................23
3.10 Electrical connections ..............................................................................................................................................24
3.11 Commissioning..........................................................................................................................................................33
3.12 Measurement of combustion e󰀩ciency during installation........................................................................................34
3.12.1 Activation of the calibration function...............................................................................................................34
3.12.2 Positioning the sensors..................................................................................................................................34
3.13 Burner pressure adjustment......................................................................................................................................35
3.14 Control panel / emergency operation and safety devices .........................................................................................37
3.15 Programming operating parameters .........................................................................................................................38
3.16 Release and reset error codes..................................................................................................................................40
Attention: this manual contains instructions for the exclusive use of the professionally qualied installer and/or maintenance
technician in compliance with current legislation.
The user is NOT qualied to intervene on the boiler.
The manufacturer will not be held liable in case of damage to persons, animals or objects resulting from failure to comply with
the instructions contained in the manuals supplied with the boiler
2 TECHNICAL SPECIFICATIONS{J}AND DIMENSIONS.................................................................................................10
2.1 Technical features ....................................................................................................................................................10
2.2 Main components view and dimensions ..................................................................................................................10
2.3 Dimensions ..............................................................................................................................................................12
2.4 Operating data .........................................................................................................................................................13
2.4.1 Technical data according to ErP Directive ......................................................................................................14
2.4.2 Determination of the primary circuit pump or boiler pump ..............................................................................15
1 GENERAL INFORMATION.................................................................................................................................................4
1.1 General warnings.......................................................................................................................................................4
1.2 Symbols used in the manual......................................................................................................................................5
1.3 Appropriate use of appliance .....................................................................................................................................5
1.4 Information for system manager ................................................................................................................................5
1.5 Safety warnings .........................................................................................................................................................6
1.6 Technical data plate ...................................................................................................................................................7
1.7 Water treatment .........................................................................................................................................................8
1.8 Boiler antifreeze protection ........................................................................................................................................9

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1GENERAL INFORMATION
Any product repairs must be performed solely by personnel
authorised by Unical, using original spare parts only. Failure to
comply with the above can compromise the safety of the appli-
ance and void the warranty.
To guarantee appliance e󰀩ciency and its correct operation,
yearly maintenance must be performed by qualied personnel.
Should you decide not to use the appliance, parts entailing
potential sources of hazard must be made safe.
Before commissioning an appliance that has not been used,
wash the domestic hot water production system, making the
water ow until it has been fully replaced.
Should the appliance be sold or transferred to a new owner or
if you move and leave the appliance, always make sure that the
instruction manual accompanies it so that the new owner and/
or installer can refer to it.
Only original accessories must be used for all appliances with
optional features or kits (including electric ones).
This appliance is intended solely for the use for which it was
expressly designed.
Any other use is to be considered improper and therefore dan-
gerous (*)
(see 1.7 Water Treatment).
1.1 -GENERAL WARNINGS
The instruction manual is an integral and essential part of the
product and must be kept by the user.
Read the warnings contained in this instruction manual carefully
as they provide important guidelines regarding installation, use
and maintenance safety.
Keep the manual with care for further consultation.
Your appliance must be installed and serviced in compliance with
the standards in force according to the manufacturer instructions,
up to standard and by legally qualied and certied personnel.
Systems for the production of domestic hot water MUST be
constructed entirely with compliant materials.
By professionally qualied personnel we mean: personnel with
specic technical skill in the eld of heating system components
for civil use, domestic hot water production and maintenance.
Personnel must have the qualications provided for by current
legislation.
Incorrect installation or improper maintenance can cause dam-
age to persons, animals or objects for which the manufacturer
is not responsible.
Before performing any cleaning or maintenance, disconnect the
appliance from the energy mains by acting on the switch of the
system and/or through the specic cut-o󰀨 devices.
Do not obstruct the terminals of the intake/exhaust ducts.
In the event of failure and/or malfunctioning of the appliance,
switch it o󰀨 and do not try to repair it or intervene on it directly.
Contact only personnel qualied in compliance with law.
ATTENTION
THE THERMAL UNIT MUST BE INSTALLED IN SUCH A WAY AS TO AVOID, IN
THE ENVISAGED OPERATING CONDITIONS, THE LIQUID IT CONTAINS
FROM FREEZING AND PREVENT COMMAND AND CONTROL PARTS FROM
BEING EXPOSED TO TEMPERATURES BELOW -15°C AND ABOVE +40°C.
THE THERMAL UNIT MUST BE PROTECTED FROM CLIMATIC/
ENVIRONMENTAL VARIATIONS WITH:
- The insulation of hydraulic pipes and condensation drain
- The use of specic antifreeze products in the hydraulic system.

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1.3 - APPROPRIATE USE OF APPLIANCE
The boiler has been constructed according to the current level of engineering and acknowledged technical
safety rules.
Nonetheless, improper use could result in hazards for the safety and life of the user or other persons, i.e.
damage to the appliance or other property.
The appliance is designed to work in heating systems, with hot water circulation, for the production of
domestic hot water.
Any other use shall be considered as misuse.
UNICAL will not be held liable for any damage resulting from improper use.
Use according to the intended purposes also includes strict compliance with the instructions in this manual.
The user must be instructed on use and operation of the heating system, in particular:
• Deliver these instructions to the user, as well as other documents concerning the appliance inserted in the envelope
inside the packaging. The user must keep this documentation safe for future reference.
• Inform the user about the importance of the air vents and the ue gas exhaust system, highlighting their essential
features and the absolute prohibition of modifying them.
• Inform the user on how to control the system's water pressure as well as operations to restore it.
• Inform the user on correct temperature control, control units/thermostats and radiators for saving energy.
• Please note that, in compliance with the standards in force, the inspection and maintenance of the appliance must
be carried out in compliance with the regulations and frequency indicated by the manufacturer.
• Should the appliance be sold or transferred to a new owner or if you move and leave the appliance, always make
sure that the instruction manual accompanies it so that the new owner and/or installer can refer to it.
The manufacturer will not be held liable in the event of damage to persons, animals or objects resulting from
failure to comply with the instructions contained in this manual.
1.4 -INFORMATION FOR THE SYSTEM MANAGER
1.2 - SYMBOLS USED IN THE MANUAL
When reading this manual, pay special attention to the parts marked by the symbols shown:
NOTE!
For further details refer to the
Technical Information:
at the address indicated
on page 2.
NOTE!
Tips
for the user
OBLIGATION!
wear protective
gloves
ATTENTION!
Possible dangerous
situation for the product
and the environment
DANGER!
Serious danger
to safety
and health
DANGER!
Danger of burns!

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1.5 - SAFETY WARNINGS
ATTENTION!
The appliance must not be used by children.
The appliance may be used by adults and only after carefully reading the operating
instructions manual for the user / person in charge.
Children must be supervised so they do not play or tamper with the appliance.
ATTENTION! The appliance must be installed, adjusted and maintained by profes-
sionally qualied personnel, in compliance with the standards and provisions in force.
Incorrect installation can cause damage to persons, animals and property for which
the manufacturer cannot be held liable.
DANGER! NEVER attempt performing maintenance or repairs on the boiler on your
own initiative.
Any work must be done by professionally qualied personnel. We recommend stip-
ulating a maintenance contract.
Insufcient or irregular maintenance can jeopardise the operating safety of the appli-
ance and cause damage to persons, animals and property for which the manufacturer
will not be held liable.
ATTENTION! Modifying parts connected to the appliance (upon
completing appliance installation)
Do not modify the following parts:
- the boiler
- the gas, air, water and electricity supply lines
- the ue gas pipe, the safety valve and the exhaust pipe
- the construction parts which affect the operating safety of the appliance
ATTENTION!
To tighten or loosen the screwed ttings, use only appropriate xed spanners.
Incompliant use and/or inappropriate tools can cause damage (e.g. water or gas
leakage).
ATTENTION!
Indications for propane gas-red appliances
Make sure that the gas tank has been deaerated before installing the appliance.
For state-of-the-art tank venting, contact the LPG supplier or person qualied in
compliance with the legal requirement.
If the tank has not been professionally deaerated, ignition problems could arise. In
that case, contact the supplier of the LPG tank.
DANGER Gas smell Should a smell of gas be perceived, follow these safety guide-
lines:
- do not turn electrical switches on or off
- do not smoke
- do not use the telephone
- close the gas shut-off valve
- ventilate the area where the gas leakage has occurred
- inform the gas supplier or a company specialised in the installation and mainte-
nance of heating systems.
DANGER! Explosive and easily ammable substances
Do not use or store explosive or easily ammable materials (e.g. petrol, paints, paper)
in the room where the appliance is installed.

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General information
ENGLISH
1.6 -TECHNICAL DATA PLATE
KEY:
1 = CE monitoring body
2 = Type of boiler
3 = Boiler model
5 = (S.N°) Serial Number
6 = P.I.N. Product Identication Number
7 = Types of approved ue gas exhaust congurations
8 = (NOx) NOx Class
A = Heating circuit characteristics
9 = (Pn) Effective nominal output
10 = (Pcond) Effective output in condensation
11 = (Qn) Maximum thermal ow rate
12 = (Adjusted Qn) Adjusted for rated heat output
13 = (PMS) Max. heating operating pressure
14 = (T max) Max. heating temperature
B = Domestic hot water circuit characteristics
15 = (Qnw) Rated heat output in domestic hot water function
(if different than Qn)
16 = (D) Specific D.H.W. flow rate according to EN625-
EN13203-1
19 = (PMW) Max. domestic hot water operating pressure
20 = (T max) Max. domestic hot water temperature
C = Electrical characteristics
21 = Electrical power supply
22 = Consumption
23 = Protection rating
D = Countries of destination
24 = Direct and indirect countries of destination
25 = Gas category
26 = Supply pressure
E = Factory settings
27 = Adjusted for gas type X
28 = Space for national brands
G = ErP
29 = Seasonal energy efciency to heat the room
30 = Seasonal water heating energy efciency.
The CE Marking
certies the appliance compliance with the essential safety re-
quirements dened in the applicable European Directives and
Regulations and that its operation meets the technical standards
of reference.
The CE marking is a󰀩xed on each individual appliance by a
special label.
The EC declaration of conformity, issued by the Manufacturer
pursuant to international regulations, can be found in the docu-
mentation accompanying the product.
The technical data plate can be found under
the casing, on the front xing crosspiece. ITS
DUPLICATE is placed next to the temperature
control unit.
/
DANGER! Do not use the appliance to support any object.
Specically, do not place any liquid containers (Bottles, Glasses, Containers or
Detergents) on top of the boiler.
If the appliance is installed inside a box, do not insert or place other objects inside it.

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ATTENTION (*) see general warnings 1.1:
The heating only models are NOT suitable
for the production of water for human con-
sumption according to Ministerial Decree
D.M. 174/2004.
ATTENTION!
ANY DAMAGE TO THE BOILER CAUSED BY
THE FORMATION OF SCALING OR BY COR-
ROSIVE WATER WILL NOT BE COVERED BY
THE WARRANTY.
VALUE MIN MAX
PH 6.5 8.5
Hardness [°fr] 9 15
NOTE!
Further details in the section
‘‘Technical Information’’ on the boiler
page of the www.unicalag.it website
1.7 - WATER TREATMENT
Feed water treatment prevents problems and
maintains the functionality and e󰀩ciency of the
generator over time.
The ideal water pH in heating systems must be
within:
To minimise corrosion, it is crucial to use a cor-
rosion inhibitor; in order for it to work properly,
the metal surfaces must be clean.
(see system protection ACCESSORIES sect. in
domestic price list)

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Technical Features
ENGLISH
1.8 - BOILER ANTIFREEZE
PROTECTION
It is activated by default
This protection can trigger only if the electricity
and gas supplies are connected.
If one of the two is not available and upon reset
11 (SM) a temperature level between 2 and
5°C is detected, the appliance will behave as
described in the table below, pos 2.
The heating system can be protected e󰀨ectively
from frost by using antifreeze products with
inhibitor for heating systems (specic for multi-
metal)
Do not use car engine antifreeze products as
they could damage the water gaskets.
P
O
S
ANTIFREEZE FUNCTION
Supplies 11 - SR (*) Status
antifreeze func-
tion
Actions
Electric Gas
1ON ON < 7 °C ON - Burner and Pump ON until T > 15°C
2
ON OFF
< 5 ÷ 5 °C OFF
FAULT SIGNAL CODE 16
(see par. 4.4 ERROR CODES).
Ignition inhibited.
OFF ON OFF Ignition inhibited.
OFF OFF OFF Ignition inhibited.
(*) SR Sensor par. 2.2

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2TECHNICAL FEATURES AND DIMENSIONS
2.1 - TECHNICAL FEATURES
NOTE!
Further details in the section
‘‘Technical Information’’ on the boiler
page of the www.unicalag.it website
2.2 - INTERNAL VIEW WITH THE INDICATION OF THE MAIN COMPONENTS
KEY
No. C.E. S.E. Description
1 Uy Control panel
2 VG Gas valve
3 Burner cover
4 E. RIL. Ignition electrode
5 E. ACC. Detection electrode
6 SR Local heating sensor
7 TL Limit Thermostat
8 Burner
9Silicon Aluminium Heat Exchanger
10 SL Condensate level sensor
11 Condensate collection pan /
Chimney tting
12 Frame
13 Condensation drainage outlet
14 Drain valve
15 SRR Global Return Sensor