Robur Next-R - 1 Features and Technical Data; Features

Features and technical data
Installation, use and maintenance manual – Next-R
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1 FEATURES AND TECHNICAL DATA
1.1 FEATURES
1.1.1 Available range
Next-R gas unit heaters are available in three versions:
▶ with horizontal ow, with axial fan (Next-R series, from
14,1 to 76,4 kW)
▶ with horizontal ow, ductables, with centrifugal fan
(Next-R C series, from 25,5 to 76,4 kW)
▶ with vertical downow (Next-R V series, from 14,1 to
44,6 kW)
Choosing the correct ow direction
Due to characteristics and positioning of internal
components, Next-R V vertical downow gas unit
heaters cannot be used for horizontal ow opera-
tion, and vice versa, horizontal ow gas unit heat-
ers cannot under any circumstances be used for
vertical downow operation.
The R15 and R20 gas unit heaters have the possi-
bility, when combined with the adjustable support
bracket OSTF020 (available as an optional), to be
used with horizontal, oblique or vertical throw.
1.1.2 Operation
The Next-R series gas unit heater is an independent heat-
ing 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 a blower 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 con-
trol device (not supplied).
The gas unit heater can operate on two burner power lev-
els, with constant fan speed.
Products of gas combustion (natural gas or LPG) ow
internally through the heat exchangers, which are in-
vested externally by the air current produced by the fan,
delivering warm air ow into the room.
The fan operates automatically only when it receives
the enabling signal, depending on the model, from the
fan thermostat or by the electronic board timer, 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.
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.
A blower upline of the burner mixes the air and gas and
expels the combustion fumes.
In the event of obstructions in the intake or exhaust duct,
or in the event of malfunction of the blower, the gas valve
stops, thus also interrupting the ow of fuel to the burner.
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
▶ Premix stainless steel burner.
▶ High head blower.
▶ Control board for brushless motor of the blower.
▶ Cylindrical stainless steel combustion chamber.
▶ Corrugated stainless steel heat exchangers with very
large exchange surface (R15, R20 models).
▶ 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
(R30, R40, R50, R60, R80 models).
▶ External steel panelling with epoxy powder enamel
nish.
▶ Axial fan(s) with high ow rate.
▶ Centrifugal fan (for the Next-R C series).
1.1.4 Control and safety devices
▶ 100 °C limit thermostat with manual reset against heat
exchangers overheating.
▶ Dierential pressure switch for controlling the correct
operation of the blower (all models except R15, R20).
▶ Fan thermostat (for R30, R40, R50, R60, R80 models).
▶ Ventilation timer (for R15, R20 models).
▶ Gas solenoid valve.
▶ Controller for ignition, adjustment and ame control.