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3. MAIN FEATURES
3.1 FUNCTIONAL DESCRIPTION
The MEC MIX series hot air generator is an independent
heating device of type atin circuit.
The appliance belonging to the II2H3P category
according to the EN 1020 standard, can be adapted
to operation with natural gas (G20) and G.P.L. (G31).
It was designed to be installed inside the room to be
heated.
The combustion circuit is watertight compared to the
heated environment and meets the requirements
of the EN 1020 and EN 1196 standards for type C
appliances: the combustion air extraction and the
fumes discharge take place outside and are insured
from the operation of a blower inserted in the circuit of
combustion.
The operation of the generator is controlled by the
room thermostat integrated in the chronothermostat.
When the hot card is hot, after a pre-wash time of about
40 seconds, provides for the ignition of the burner.
The detection electrode checks that the ignition has
occurred.
In the event of a flame failure, the control board blocks
the device.
The combustion products internally cross the heat
exchangers that are invested externally from the air
flow produced by the fan giving rise to the circulation
of hot air in the environment.
The airflow direction is adjustable by means of the
horizontal fins of the mobile grate.
The fan is automatically activated only by hot heat
exchangers (when the temperature of 40 °C is
reached on the exchangers probe), in order to avoid
the introduction of cold air into the environment, and it
will switch off with cold exchangers.
In case of overheating of the heat exchangers, due
to anomalous functioning, the probe of temperature
removes voltage from the gas valve by supplying
the blower and the fan at maximum speed; if the
temperature should increase further, the limit
thermostat intervenes which causes the generator to
switch off.
The reset of the generator in block due to intervention
of the limit thermostat is manual and takes place via
the remote control.
WARNING!
The reset of the generator in block due to
intervention of the limit thermostat is the
responsibility of the personnel professionally
qualified, after having identified the cause of
overheating.
Upstream of the burner a blower provides for the air-
gas mixing and for the forced expulsion of the fumes
derived from combustion.
In the case of obstruction of the intake or exhaust duct,
or in the event of malfunction of the blower,
the electronics respond automatically, causing
generator modulation.
In the event of obstructions or malfunctions beyond
the permitted temperature, a flue gas thermostat will
then cause the gas valve to stop and the generator to
shut down.
Winter operation of the generator can be automatic
or manual: for further information see paragraph
WINTER OPERATION (HEATING).
During the summer it is possible to operate the fan
only, in automatic or manual mode, to order to have a
pleasant movement of the ambient air.
3.2 CONSTRUCTION CHARACTERISTICS
The MEC MIX series hot air generator is supplied
complete with:
- premixed stainless steel burner
- high prevalence blower, with modulation of the
rotation speed
- stainless steel combustion chamber
- heat exchangers, made of stainless steel, with a
very high heat exchange capacity.
- external paneling made of painted steel with epoxy
powders.
- high air flow axial fans, with variation of the rotation
speed.
The generator is also supplied with the following
components control and security:
- electronic management board, with microprocessor
and anti-noise filter: provides for burner ignition
functions, surveillance and flame modulation;
command and control of the burner fan speed,
command fan speed; temperature control of the
exchanger by means of a probe;
- Supply voltage: 230 V - 50 Hz
- Security time: 5 seconds
- Prewash time: 40 seconds
- Model: BRAHMA TC3 40 with transformer ignition
BRAHMA AR1
- 90 °C limit thermostat against overheating of heat
exchangers.
- flue gas thermostat: in case the duct of aspiration /
exhaust fumes or the duct internal condensate
evacuation were blocked, the appliance is stopped.
- gas solenoid valve: if a device intervenes of safety
(limit thermostat, thermostat of safety, etc.) the gas
valve is de-energized electrically with the consequent
interruption of inflow of gas to the burner.
- Supply voltage: 230 V - 50 Hz
- Operating temperature: 0 ° C up to + 60 ° C.
- Model: SIT 848 SIGMA
