1
Wall mounted air heaters
with premixed gas burner
MEC MIX C
condensation and modulation
MEC MIX F
xed power
TECHNICAL INFORMATION
2
3
Wall mounted air heaters with premixed gas burner
Range MEC MIX C condensation and modulation
Model 20/35 - 20/45 - 20/70 - 20/90
Range MEC MIX F xed power
Model 35 - 50 - 70 - 100
Technical Information
The present manual is divided in ve sections:
- SECTION A - GENERAL INFORMATION
It contains all details related to the description of the generators and their technical characteristics
- SECTION B - OPERATING AND MAINTENANCE
Section reserved to the user and contains all the information necessary for the proper operation and
periodic testing It collects all the indications and guidelines that must be observed for the installation
- SECTION C - HYDRO INSTALLATION
- SECTION D - ELECTRICAL INSTALLATION
- SECTION E - SERVICE AND MAINTENANCE
Important notes for consultation:
1 - To ensure a correct and safe use of the device, the planner, the installer, the user and the maintainer, for their
respective responsibilities, are required to strictly comply with the present manual.
This manual should be conserved for the eventual consultations and must
accompany the equipment throughout its lifetime, including the case of transfer to third parties.
2 - WARNING! Advises the reader that the next given information is extremely important and must be followed
exactly. Otherwise proper function of the unit and safety might be jeopardised. Paragraphs written in bold letters
contains important information, suggestion and advice that are strictly recommended.
3 - A2B Accorroni E.G. S.r.l. declines any responsibility for any damage caused by improper use of the
appliance,due to not applying the information given in this manual.
4 - Data, pictures and components may vary without notice. A2B Accorroni E.G. S.r.l. may carry out some
changesto the aim of product development and improving.
5 - Any reference to local laws, European directives and technical regulation reported in this manual are intended
as general information and valid on the date of print out. Any modication occurred after this date might not be
constitute reason for any obligation of A2BAccorroni E.G. S.r.l. against third parties.
6 - A2B Accorroni E.G. S.r.l. is responsible for product’s conformity to the laws, directives and technical regulation
in force on the date of commercialization. A2B Accorroni E.G. S.r.l. is not responsible for plant design, use and
maintenance’s compliance with laws and regulation in force.
sono ad esclusivo carico, per le rispettive competenze, del progettista, dell’installatore e dell’utente.
4
TABLE OF CONTENTS
1. GENERAL WARNINGS ............................................................................................................. 4
2 . SAFETY PRECAUTION ............................................................................................................. 4
2.1 Qualication of the installer ........................................................................................................ 4
2.2 Power supply .............................................................................................................................. 4
2.3 Gas fuel ...................................................................................................................................... 4
2.4 Gas leaks ................................................................................................................................... 4
2.5 Use ............................................................................................................................................. 4
2.6 Transport and handling .............................................................................................................. 4
3 . GENERAL FEATURES .............................................................................................................. 5
3.1 Description of operation ............................................................................................................ 5
3.2 Construction features ................................................................................................................. 5
3.3 Table of technical data MEC MIX C condensation axial ............................................................ 6
3.4 Table of technical data MEC MIX F axial .................................................................................. 6
3.5 Wiring diagram MEX MIX C condensation centrifuge ................................................................ 7
3.6 Table of technical data MEC MIX F centrifuge .......................................................................... 7
3.7 Dimensions MEX MIX C 20/35 - 20/45 centrifuge ..................................................................... 8
3.7 Dimensions MEX MIX F 35 -50 centrifuge ................................................................................. 8
3.8 Dimensions MEC MIX C 20/35 - 20/45 axial .............................................................................. 9
3.8 Dimensions MEC MIX F 35-50 axial .......................................................................................... 9
3.9 Dimensions MEC MIX C 20/70 - 20/90 centrifuge .................................................................... 10
3.9 Dimensions MEC MIX F 70-100 centrifuge................................................................................ 10
3.10 Dimensions MEC MIX C 20/70 - 20/90 axial ............................................................................. 11
3.10 Dimensions MEC MIX F 70-100 axial ....................................................................................... 11
3.11 Electrical wiring ......................................................................................................................... 12
4 . CONTROL AND SAFETY.......................................................................................................... 13
4.1 Description ................................................................................................................................ 13
4.2 General features ....................................................................................................................... 13
4.3 Technical data logical board ...................................................................................................... 13
4.4 Start-up inspection .................................................................................................................... 14
5 . CHRONOTHERMOSTAT GA1 .................................................................................................. 15
5.1 Application ................................................................................................................................. 15
5.2 Technical data ........................................................................................................................... 15
5.3 User guide ................................................................................................................................. 15
5.4 Description of error codes ......................................................................................................... 19
5.5 Instructions for installation ......................................................................................................... 19
5.6 Wiring diagram for equipment BRAHMA type TC340P ............................................................. 20
5.7 Wiring diagram for cascade connections of multiple devices via Open Therm ......................... 21
5.8 Type of connections .................................................................................................................. 22
6 . INSTALLATION ......................................................................................................................... 23
6.1 General rules for installation of the unit .................................................................................... 23
6.2 Installation Sequence ............................................................................................................... 23
6.3 Exhaust ue/combustion design ............................................................................................... 25
6.4 Example of calculation .............................................................................................................. 25
6.5 Condensate drainage ................................................................................................................ 31
7. INSTALLATION.......................................................................................................................... 32
7.1 Heater connection to the power supply ..................................................................................... 32
7.2 Installation of the chrome thermostat ........................................................................................ 32
8. SERVICE AND MAINTENANCE ............................................................................................... 33
8.1 First start ................................................................................................................................... 33
8.2 How to adjust the gas valve ...................................................................................................... 33
8.3 How to change GAS .................................................................................................................. 35
8.4 Maintenance ............................................................................................................................. 35
5
SECTION A - GENERAL INFORMATION
1. GENERAL WARNINGS
The present manual is integral part of the product.
It must be stored carefully for any future use or
reference.
Failure to comply with the instruction given by this
manual will void the warranty terms. In case of resell
or transfer of the unit to others assure this manual is
forwarded with it.
The appliance shall be used solely for the purpose to
which has been designed and manufactured.
Any use of the unit not listed hereafter will be considered
improper and therefore dangerous.
2. SAFETY PRECAUTIONS
2.1 QUALIFICATION OF THE INSTALLER
Installation of the unit shall be carried out by trained
and qualied operators.
2.2 POWER SUPPLY
The air heater MEC MIX COND shall be properly powered
and grounded following the local regulation.
The grounding system shall be properly designed to
guarantee an efcient grounding.
2.3 GAS FUEL
Before starting the unit assure the followings:
- gas supply parameters are compatible with th data
shown on the unit’s label
- the air intake grate is free from any obstacle
- the unit is supplied with proper fuel
- the plant shall be designed for the actual power
output, tted with proper safety and controldevices,
in compliance with the local regulation
- cleaning of the air supply ducts and gas piping has
been properly carried out
- the gas supply ow rate is adequate for the
unit’s requested ow rate
- the gas supply pressure is within the range shown
on the unit’s label
2.4 GAS LEAK
In case of smell of gas:
- do not operate mobile phone, switch or any device
that could cause sparking;
- immediately open windows and doors;
- all qualied operator for assistance
2.5 USE
Do not allow children nor not qualied operators
of running the unit.
Strictly respect the following advices:
- do not touch the unit if wet;
- do not insert anything through the fan’s grate;
- do not access the inside of the unit. Only qualied
operator is allowed;
- before any maintenance, including cleaning of the
cover, cut off the unit’s electric power ;
- do not touch the exhaust ue as well as any warm
part of the unit;
- do not wet the unit with any liquid;
- do not ground the unit by means of the gas pipe;
- do not install the unit outdoors;
- do not place anything on top of the unit;
- do not touch moving parts of the unit;
2.6 TRANSPORTATION AND HANDLING
The unit is delivered packaged on wooden pallet.
The handling of the unit requires proper equipment,
as forklift or trans pallets, adequate for the unit’s
weight.
Carefully handle the unit by means of the relative
supports.
WARNING! During transport and handling the unit
shall be kept vertical.
At receiving the goods, visually check for any damage to
the box or the unit either. In case of relevant damage,
immediately claim to the carrier company and do not
install the unit.
Do not dispose the package in the environment
and keep it out of reach of children.
The unit shall be stored in a dry place and protected
against weather.
Avoid long term storage.
6
3. GENERAL FEATURES
3.1 DESCRIPTION OF OPERATION
The MEC MIX COND is classied as individual gas-
red air heater equipped with hermetically sealed
combustion chamber and premix-burner.
The system is category II2H3P as per EN1020 and can
be supplied by natural gas (G20) and L.P.G. (G31).
It has been designed for indoor installation, directly
in the served room.
The combustion circuit is sealed from the room’s
air as prescribed by EN1020 and EN1196 for type
C: combustion air inlet and exhaust outlet ensure
the combustion air intake and the exhaust gas
expulsion.
The air heater is controlled by a micro processor
integrated in the programmable timer, which includes
the room temperature thermostat.
Upon the heating request, the control starts the premix
blower, which runs for 40 s and afterwards the burner
starts.
A ame sensor checks the burner properly started; if
any ame isn’t detected the unit will be blocked.
The exhaust gas ows throughout the inner side of
the exchanger, while the air ows over the exchanger
rising its temperature and thus warming the room.
The air ow direction can be adjusted by means of
aps mounted onto the air outlet grate.
The air blower runs only if the exchanger’s temperature
is higher than a xed limit (e. g. 40 °C), in order to avoid
of blowing cold air. In case of overheating of the heat
exchanger, likely due to a failure, a temperature sensor
detects the exchanger’s temperature and cut-off the
gas valve while the premix-blower and the air blower
run at maximum rpm. If the temperature keep rising,
the safety thermostat would cause the complete shut
off of the unit.
In this case the unit can be reset by the control
panel.
WARNING!
The unit reset after the safety Thermostat activation
shall be performed only by qualied operator, who
rst shall identify the mode and cause of failure.
The premix-blower is placed in front of the burner and
ensure the proper air-gas ratio at any condition.
If the air intake ductor the exhaust ue either is not clean
or any obstacle would hinder the air/exhaust ow, the
electronic control is able to adjust the premix-blower
rpm and therefore the power output.
An exhaust thermostat check the proper function within
certain limit; if the exhaust temperature exceeds the
limit, the unit would be stopped.
In winter mode the unit can run in automatic or Manual
mode either (see HEATING section).
In summer mode the unit can run the air blower either in
automatic or manual mode, in order to have a pleasant
air circulation inside the room.
3.2 CONSTRUCTION FEATURES
The air heater MEC MIX COND is delivered equipped
with the following:
- high head premix-blower, with rpm modulation
- combustion chamber, made of stainless steel
- heat exchanger, made of stainless steel, high
heat-exchanging performance
- covering panels made of epoxy coated steel
- axial and centrifugal air blowers running high
ow rate and at variable rpm Further equipments
on safety:
- control board with microprocessor and noise lter,
controls the burner starting, the safety devices,
the ame modulation, the air blower rpm, the
premix blower rpm and thus the heat exchanger
temperature by means of sensor
- power supply 230 V - 50 Hz
- safety time 5 s
- chamber evacuating time 40 s
- model BRAHMA TC3 40 with ignition
Transformer model BRAHMA AR1
- limit thermostat 90 °C, to protect the heat
exchanger against over heating
- exhaust thermostat, which activation will stop
the unit in case of obstruction to the air/gas or
exhaust ow; it would also activate in case of
obstruction of the internal condensate drain
- gas solenoid valve, is deactivated any time a
safety device activates and stops the gas ow
- power supply 230 V - 50 Hz
- operating temperature range 0 / 60 °C
- model SIT 848 SIGMA
7
3.3 TABLE OF TECHNICAL DATA MEC MIX C CONDENSATION AXIAL
3.4 TABLE OF TECHNICAL DATA MEC MIX F AXIAL
8
3.5 TABLE OF TECHNICAL DATA MEC MIX C CONDENSATION CENTRUFUGE
3.6 TABLE OF TECHNICAL DATA MEC MIX F CENTRUFUGE
9
* The condensate drain is present only in the Model MEC MIX C
747
120
3.7 DIMENSIONS
Serie MEC MIX C condensation model 20/35 - 20/45 centrifuge fans
Serie MEC MIX F model 35-50 centrifuge fans
Values in mm
gas
connection
air inlet exhaust
outlet
Condensate
Drain
TOP VIEW
10
3.8 Dimensions
Serie MEC MIX C condensation model 20/35 - 20/45 axial fans
Serie MEC MIX F model 35-50 axial fans
* The condensate drain is present only in the Model MEC MIX C
Values in mm
TOP VIEW
gas
connection
exhaust
outlet
air inlet Condensate
Drain
11
Dimensions
Serie MEC MIX C condensation model 20/70 – 20/90 centrifuge
Serie MEC MIX F model 70-100 centrifuge
Values in mm
gas
connection
gas
connection
air inlet air inlet
exhaust
outlet
exhaust
outlet
12
3.10 Dimensions
Serie MEC MIX C condensation model 20/70 – 20/90 axial
Serie MEC MIX F model 70-100 axial
Values in mm
gas
connection
gas
connection
air inlet air inlet
exhaust
outlet
exhaust
outlet
13
3.11 Electrical wiring - Range MEC MIX C/F
LEGEND
ACC1 Remote ignition transformer
C1 Capacitor 1 (5μF)
C2 Capacitor 2 (5μF)
EA Ignition electrode
EF Premix blower
EV1 First stage valve
EX Cascade unit connection
F1 Fuse 1 (6,3A)
F2 Fuse 2 (6,3A)
FAN1 Air motor fan 1
FAN2 Air motor fan 2
GA1 Chrono-thermostat
ION Detecting electrode
M1 Terminal 1
RESET Reset button
SA Room temperature sensor (optional)
SL LED lights
SR LIMIT/FAN sensor
STF Fire damper (optional
Fig. 2
14
SECTION B - OPERATING AND MAINTENANCE
4. CONTROL AND SAFETY
the MEC MIX COND are shown. The unit is operated
byBRAHMATC340 control board. The control panel
also includes the room temperature thermostat,
programmable timer and function/failure display.
Hereafter all instruction for proper use of the digital
control.
4.1 DESCRIPTION
This device has been design for function and safety
control of gas-red air heater with hermetically sealed
combustion chamber and running automatic start and
blower modulation.
4.2 GENERAL FEATURES
The major features of this device are the followings:
- compliance with EN298:2003-09 (European
standard for ame check automatic device for
gas burner)
- CE certicate in compliance with Directive GAS
90/396/EEC and following amendmen (Directive
93/68/EEC)
- air blower rpm driven by means of a phase-cut
driver
- burner’s motor driven by means of phase-cut
driver for fan-assisted burner type or PWM signal
for premix-burner equipped with brushless motor
- two independent safety contactdrivingthe EV1
main gas solenoid valve
- output for auxiliary ignition electronic transformer
control
- heat output modulation by means of PWM signal
(for premix burner)
- possibility of interfacing with chromo-thermostat
BRAHMA GA1 through Open Therm TM
communication protocol
- summer ventilation function (available only with
chrono-thermostatGA1)
- air delivery temperature and safety control by
means of a double NTC ST16 temperature probe
- air delivery temperature control by means of a
double NTC ST08 temperature probe
- possibility of connecting a safety thermostat
- arranged for NTC ST07 temperature probe
control used as room or outdoor temperature
sensor
- possibility of connecting are damper actuator
- possibility of connecting an analogue signal
controller 0-10 V (e.g. PLC)
- pcb on-board manual reset button
- operation and failures signalling by two colours led
- communication port RS-232 for set-up and
diagnostic
- integrated noise lter EMI
- two fuses, equipped with ejector, for power supply
line protection on both potentials
- pcb on-board connections for safety grounding
4.3 TECHNICAL DATA LOGICAL BOARD
Internal fuse: 6.3 A type delayed
for TC340P: 3.15 A type delayed
Esternal fuse (recommended): 6.3 A type rapide 1
for TC340P: 3.15 A type rapide 1
CE type certicate:
CE0051-PIN0051BU3887
Timing:
Pre-ignition purge ventilation (TP):0 60 s
Safety time (TS): 3 … 120 s
Response time for ignition failure: < 1 s
Post-shutdown ventilation
- premix blower EF (tPOST): 0 …1200 s
- warm air blower FAN (tFS): 2 0 … 1200 s
Warm air blower starting delay
FAN (tFA): 2 0 … 1200 s
Modulation delay (tRP1): 1 … 240 s
Lockout delay for extraneous ame
(opz. Knn): 0 … 60 s
Lockout delay for insufcient air ow
(opz. Qnn)3: 3 … 120 s
Pre-ignition time (opz. Jnn): 1 … 60 s
Cycle repeating attempts (opz. Ynn): 1… 10
components:
Interface OpenTherm™: 50 m Flame monitoring
Maximum cabling length for external:
.
Interfacce OpenTherm™: 50 m
15
Fig. 3
Connection of the probe double NTC
Brown
Black
Blue
Fig. 4
Measuring of the ame signal
Flame monitoring
The ame detecting device exploits the self rectifying
property of the ame. Note that, about safety, this
device is more sensitive to the ame during the purging
ventilation and the ignition steps (negative differential
switching).
Minimum ionizing current: 0.5 μA
System’s temperature probes
- Control probe (SR)
The control probe is used for heat-exchanger
temperature detection and thus for both fan control and
safety stop. It is a NTC double sensor type (standard
version) and BRAHMA ST16 sensor is required (see
picture 3).
- Room temperature probe (SA) - optional
The room temperature probe can be used in case the
remote control panel, equipped with room temperature
sensor, is placed in a separate room or the room
temperature shall be related to the outdoor one either.
See “FUNCTIONS” paragraph for more details.
To this purpose BRAHMA ST07 sensor is required for
room temperature detecting and BRAHMA SSE for
outdoor temperature.
Fire damper (STF) - optional By means of this contact
the status of the eventual re damper can be detected,
considering it normally closed. If the contact opens the
unit’s control interrupts the running cycle and keeps it
on stand-by. An alarm activates as well and it is shown
by lighting of the led.
Upon request, the response of the unit in case of
“contact open” may be changed.
4.4 START-UP INSPECTION
It is strictly recommended to perform the unit inspection
before the start-up and any time it occurs the unit hasn’t
been running for a long time or periodic check-up has
been carried out. Before starting the unit check the
followings:
- the combustion chamber is free from gas
- if ignition cycle is simulated without gas, check the
unit lockout occurs after the safety time
- if gas supply is interrupted while the unit is
running, check the solenoid valve cut-off happens
within 1 s. After restarting, the unit lockout shall
occur after a certain number of cycles (see set-up
parameter)
- operation timing and sequence shall correspond to
those declared for the type of control unit used
- the ame sensor signal shall be high enough
(Fig. 4)
- the ignition electrodes shall be properly xed to
have clearance equal to 2-4 mm
- the activation of safety devices shall cause the unit
lockout or the safety stop, in compliance
with the type of application.
5. CHRONO-THERMOSTAT GA1
5.1 APPLICATION
The digital chrono-thermostat GA1canbeweekly
Programmed for remote controlling the MEC MIX and
the room temperature, allowing 3 different temperature
levels and driving one or more heaters. It doesn’t
require power supply connection nor battery and it
can control 3 different heaters but they need to be
equipped with relative interfacing pcb, which shall be
specied in the order.
To the aim of a exible management of the facility
heating, this control panel allows of different
function modes: manual control; holidays; freezing
prevention.
The heater control is included in the chrono thermostat
as well, which manages the power output and the
automatic alarm resetting.
Here below a detailed description of the chrono
thermostat function and the user guide are
reported.
Picture 5 shows the look of this unit and picture 6
shows the display of the panel and picture 7 shows
the performances.
The use of serial interface is possible by adding
BRAHMA 810 unit and dedicated software.
Mirco amper measure
16
5.2 TECHNICAL DATA
Connection: not-polarized two wires type
Protection class: IP20
Weight: 110g
Display: LCD
Clock: quarz
Adjustingmode: modulating
Adjusting range: 1÷ 30 °C
Room Temperature display: 0 ÷ 35 °C
Temperature detecting time: every 60 s
Temperature detecting accuracy: 0.1 °C
Temperature setting accuracy: 0.5 °C
Temperature control accuracy: ±1°C
Memory term: 8 hours
Weekly programming on hourly basis with 3
temperature levels
Special function mode: automatic, manual,
holidays, freezing prevention
antigelo
5.3 USER GUIDE
Once reset the chrono-thermostat the time and date
on the display start lighting as reminder the operator
has to set them. Set-up is allowed in the following
modes: automatic, manual and freezing prevention.
Here below the setting procedure.
Push the [ ] button, the time is shown and the Day
starts lighting. By the encoder set the present day.
Then press [OK] to conrm and pass to hour setting,
otherwise press [ ] to return to the main menu. Repeat
the same to set hour and minute and conrm [OK].
In case of any action is taken within 10 s, the display
will show the main menu.
Mode “automatic”
The unit run the programme. The graphic, time
and temperature are lighted on the display while
automatically running the program, related to the day
of the week lighted on the left side of the display.
Mode “freezing prevention”
Three temperature levels can be set: [T2]highest, [T1]
medium and [T0] lowest.
The lowest Temperature can be used as “freezing
prevention” control. Push the [T2] button for highest
temperature setting by means of the encoder. Press
either [OK] or [T2] again to conrm. The same procedure
for setting [T1]. Note that anyway T2 shall be higher
than T1, Which shall be higher thanT0; otherwise a
“beep” sound advises that the value is not allowed.
However each temperature shall be within 1- 30 °C.
Push the [ ] button for [T0] setting, select the value by
means of the encoder, and press [ ] again to conrm
and return to the main menu.
Note: if press [OK] after selecting the T0 value the
“freezing prevention” mode would be activated.
On the display only the [ ] symbol and T0 temperature
will appear; the T0value can be changed by means
of the encoder.
Press [AUTO] button to exit the freezing prevention
mode and activate the weekly program.
Modo “manuale”
Press the [MANUAL] button to deactivate the weekly
program mode and manually select the desired room
temperature.
Press [OK] to conrm and run the manual mode.
Otherwise press [AUTO] to return back to the weekly
program mode.
In manual mode, the set temperature can be changed
at any time by means of the encoder.
On the display the graphic will not appear and the
[] symbol will light on.
Press the [AUTO]button to exit the manual mode and
return back to the weekly program mode.
Mode “holidays”
Press the [ ] button to set the desired room
temperature to be kept while the room isn’t used for
days.
Once selected the temperature press [OK] to conrm
and the number of days (shut down term) will be
requested: maximum 99 days.
Press [OK] to conrm.
The number of left days decrease everyday at midnight.
Once the holiday term expires, the control automatically
passes to the weekly program mode. In holidays mode
is possible to change the desired temperature by
means of the encoder and then press [OK] to conrm.
In order to change the holiday term, repeat the above
procedure. To exit the holidays mode press [AUTO] or
set thenumber of days = 0.
Fig. 5
Chrono thermostat GA1
17
Weekly programme
Press the [PROG] button to start the weekly
programming. By the encoder, select the day of the
week and press [OK] to enter the setting.
Select the time for starting by means of the encoder,
press [OK] to conrm and then select the temperature
level desired from this time; press [OK] to conrm and
then select the time extension for this temperature
and press [OK] to conrm. Repeat for setting other
temperature levels and time. It is possible to return
back without leaving the programming mode and
keeping the already set parameters.
Then press [PROG] to return to the selection of the
day of the week. By holding pressed the [OK] button
the lighted day programme will be copied to the next
day of the week.
Press [AUTO] to leave the programming mode
or hold pressed the [PROG] button.
Fig.6
DESCRIPTION DISPLAY
Indication of the day
1= Monday........7= Sunday Indicators multi function: time, temperature, error codes
Anomaly
Manual Flame and Block Anti frost
Communication
Graphic daily programming
Status of the generator
OFF- Summer/winter
Holidays
display liquid
crystals
Selector
functions
chrono/boiler
Button
ON-OFF
Anti frost
Button
maintenance
Button not used Button comfort
Button comfort
Encoder
Reset of memory
RESET
Programming
Fig.7
ILLUSTRATION OF THE COMMANDS
18
Standard communication
The communication icon is steadily lighted on if
communication with the heater is running properly.
Normally the requested heat output is displayed as
% of the nominal output.
Where applicable the number of heaters connected is
displayed on the top right.
Operation selection : Off - Summer - Winter
Press the [ ] button to select the operation mode
to be run: OFF ( ), SUMMER ( ) or WINTER ( ).
WINTER activates the heating.
Run and the output is modulated upon the outdoor and
room temperature (i.e. heating request from the chrono-
thermostat; the outdoor temperature is compared to
a set-point value).
SUMMER activates only the air blower for ventilation.
It can be activated manually or
automatically by program; T2 automatic; T0 and T1
in any other mode of operation and deactivating the
ventilation.
The manually activation - by pushing the bottom on
the chrono thermostat.
In the rst case press the [FAN] button to run the air
blower and press it again to stop it.
Press [OFF] to put the heater on stand-by, from any
function mode.
Outdoor temperature
Press long the [ ] button to enter the outdoor
temperature setting menu.
If one of the appliances switched to Encrono GA1 has
an outdoor temperature probe (congured to translate
information via Open Therm) it is possible to visualize
the value closed to indicator “tou”.
By which the set point “Tset” can be loaded and the
outdoor temperature displayed.
The Tset value is used to calculate the heat output
request and shall be within the range -99 / 100 °C.
Heater lockout and remote reset
In case of heater (or more than one) failure, which
causes the unit lockout, different signals might be
displayed based on the type of protocol/ application
used:
1. two digits number that identies the faulty unit
(n. 01 … n.02, ….etc), in case of heaters cascade
installation 2. “E00” error code, which identies the
mode of failure
3. “Err” in case the mode of failure is not available
(generic error) Table xx shows the list of failure modes
and codes.
Note that E05 is the sole failure independent from the
number of units connected, as it refers to the room
temperature sensor that is xed inside the control panel
indipendente of the display shown on the left side of
the screen, on the right you will see a funter three-digit
error code, preceded by the letter F, communicated
directly from the card remote and displayed without
any processing by the programmable thermostat.
Press [RESET] button to reset the alarm.
However some alarms cannot be reset by the control
panel; in this case E11 will be displayed for 10 s. For
some alarm the reset button is deactivated and a
“beep” sound advises that reset by the control panel
is not allowed.
Fig.8
DIMENSIONS mm
19
5.5 INSTRUCTIONS FOR INSTALLATION
The position of the control panel shall be selected based
on a proper location of the room sensor, embedded
in the panel; however at 1.5 m from the oor and far
from any heat/cold source (different heaters, windows,
etc). The control panel can be xed to the wall hanging
by provided slots or recessed in the wall by means of
proper box. The wall surface shall be at to avoid the
panel box deformation once xed and the consequent
difculty in coupling the cover.
After the box is xed, remove the cable terminal From
the slot and do the cables connection; then put the
terminal back into the slot.
The communication protocol allows of 50 m maximum
cable length and Ohm resistance of each cable shall
not exceed 5 Ohm.
In case of proximity to strong electromagnetic eld, it
is recommended to use shielded cable.
Fig. 10
CONNECTION OF THE PULL OUT
TERMINAL BOX
Terminal box
housing
Front panel
back
PCB
Connection
cables
Pull-out terminal screw
terminal box
FRONT PANEL ASSEMBLY
Front
Basic
Fig.9
5.4 DESCRIPTION OF ERROR CODES
Fig. 11
DIAGRAM STANDARD CYCLE
Power level
requested from
OpenTherm
(or calculated)
Exhaust
fumes (EF)
Modulator
Treated air fan
(FAN)
100%
0%
MAX speed
MAX speed
MIN speed
MIN speed
MAX current
MIN current
TP-TS current
TP -TS speed
Starter / s
First level valve (EV1)
Second level valve (EV2)
20
5.6 WIRING DIAGRAM FOR EQUIPMENT BRAHMA TYPE TC340P
Fig.12
LEGEND
GA1 Chrono thermostat ENCRONO type GA1
EF Fan motor of the burner
FAN Fan motor of treated air
ACC1 Auxiliary ignition transformer
EV1 First stage valve
SR Temperature control sensor
STF Fire damper
SA Room temperature sensor (optional)
SL Led lights
RESET
EX Cascade connection
ION Flame sensor
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