Robur M40 - 1 Features and Technical Data; Features

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
appliance 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 re-
quirements 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 insert-
ed 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 con-
trol 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 in-
ternally through the heat exchangers, which are invested
externally by the air current produced by the fan, deliver-
ing warm air ow into the room.
The fan operates automatically only when it receives the
enabling signal from the fan thermostat, i.e. with hot heat
exchangers, 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 revolving louvres of the grille.
A ‘vertical louvres kit’ is also available on request for hori-
zontal regulation of the airow.
If heat exchangers overheat due to malfunction, a temper-
ature limit thermostat cuts o the supply to the gas valve,
thus interrupting 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 auto-
matic or manual.
In summer it is possible to operate the fan only in order to
provide a pleasant air ow within the room.
1.1.3 Mechanical components
▶ Stainless steel atmospheric burner.
▶ Flue gas extractor for forced draft of combustion prod-
ucts.
▶ Cylindrical stainless steel combustion chamber.
▶ Robur patented heat exchangers, made out of a spe-
cial aluminium die-cast alloy, with horizontal nning
on the air side and vertical nning on the ue gas ex-
haust 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
functions:
 burner ignition
 ame monitoring
▶ 100 °C limit thermostat with manual reset against heat
exchangers overheating.
▶ Thermostat to protect the internal components from
overheating, with manual reset.
▶ Dierential pressure switch.
▶ Fan thermostat.
▶ Gas solenoid valve.