Robur M Series - Features and Technical Data; Product Features and Operation

Features and technical data
Installation, use and maintenance manual – M gas unit heater
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1 FEATURES AND TECHNICAL DATA
1.1 FEATURES
1.1.1 Available range
M gas unit heater gas unit heaters are available in two versions:
▶ with horizontal ow, with axial fan (M gas unit heater series)
▶ with horizontal ow, ductables, with centrifugal fan
(M gas unit heater C series)
1.1.2 Operation
The M series gas unit heater is an independent heating appli-
ance with airtight combustion circuit and forced air draft.
It has been designed to be installed inside the room to be
heated.
The combustion circuit is room sealed and meets the require-
ments for type C appliances: combustion air supply and ue
gas exhaust discharge take place outdoors and are ensured by
the functioning of an extractor fan inserted in the combustion
circuit.
The appliance is also approved for type B for installations where
it is allowed to take the combustion air directly from the room
to be heated.
The operation of the gas unit heater is controlled by a control
device (not supplied).
The generator works on/o, on or o, at the heat output and the
ventilation speed of the license plate.
Products of gas combustion (natural gas or LPG) ow internally
through the heat exchangers, which are invested externally by
the air current produced by the fan, delivering hot air ow into
the room.
The fan operates automatically only when it receives the ena-
bling signal from the fan thermostat, i.e. with hot heat exchang-
ers, in order to avoid the introduction of cold air into the room,
and it will switch o with cold exchangers.
The air ow direction is adjustable vertically by means of the re-
volving louvres of the grille.
A ‘vertical vane kit’ is also available on request for horizontal reg-
ulation of the air ow.
If heat exchangers overheat due to malfunction, a temperature
limit thermostat cuts o the supply to the gas valve, thus inter-
rupting fuel ow and turning o the burner.
In case of obstruction of the suction or exhaust duct, or in case
of malfunction of the extractor fan, the dierential pressure
switch intervenes, causing the gas valve to stop and the heater
to switch o.
The winter operation of the gas unit heater can be automatic or
manual.
In summer it is possible to operate the fan only in order to pro-
vide a pleasant air ow within the room.
1.1.3 Mechanical components
▶ Stainless steel atmospheric burner.
▶ Flue gas extractor for forced draft of combustion products.
▶ Cylindrical stainless steel combustion chamber.
▶ Robur patented heat exchangers, made out of a special alu-
minium die-cast alloy, with horizontal nning on the air side
and vertical nning on the ue gas exhaust side, with a very
high heat exchange capacity.
▶ External steel panelling with epoxy powder enamel nish.
▶ External panels made of stainless steel (available on request).
▶ Axial fan(s) with high ow rate.
▶ Centrifugal fan (for the M gas unit heater C series).
▶ Flange for duct connection (for series M gas unit heater C).
▶ Ground control with lock signal and reset button.
1.1.4 Control and safety devices
▶ Electronic control unit, which provides the following func-
tions:
 burner ignition
 ame monitoring
▶ 100 °C limit thermostat with manual reset against heat ex-
changers overheating.
▶ Thermostat to protect the internal components from over-
heating, with manual reset.
▶ Dierential pressure switch.
▶ Fan thermostat.
▶ Gas solenoid valve.