1.8 Design specifications
Heat Exchanger
Manufactured from welded stainless steel,
it can be easily inspected for cleaning and
maintenance operations and comprises the
following elements:
• Cylindrical shaped combustion chamber in
stainless steel with low thermal load.
• Heat exchanger elements in steel with
large surface area containing staggered and
opposing indentations.
External casing
The external casing consists of panels in a
pre-painted and/or powder-coated sheet
metal, also includes:
• Frame structure in press-folded profile
with aluminium die-cast corner joints.
• Sandwich panels with internal glass wool
insulation.
Fan assembly
Consists of one or more centrifugal fans
with a low level of sound emission and high
performance.
• Three-phase models are driven by electric
motors with a pulley and belt transmission
system.
• Single-phase models use a direct drive fan.
Safety and control thermostat
The appliances are equipped with ther-
mostats with the sensor located on the air
supply (pre-calibrated and electrically
connected in the factory), with the follow-
ing functions:
• “FAN” function (FAN thermostat –
calibration: +25/+35°C). Activates the
fans max. 60 seconds after the burner has
started and stops them approx. 4 minutes
after the burner has switched off.
• “SAFETY” function (TR safety thermostat
- factory calib 80°C), has the
function of interrupting the burner
operation in case of abnormal overheating
of the air. It is automatically reset. It shall
be correctly calibrated when it is used for
the first time.
• “LIMIT” function (LM Thermostat - sealed
calibration: +100°C): will stop the burner
if the air becomes overheated abnormally.
Reset is manual.
Flue pipe
The heater is fitted with a circular flue collar
to enable a condense TEE to be inserted
safely and fixed at the start of the flue system.
1.9 Identification
The warm air heaters can be identified through:
• The data plate, applied on the heater, that
specifies the main technical performance
data.
In the event of damage or loss, request a
duplicate from the manufacturer.
1.9.1 Receiving the product
The appliance is supplied with:
• Document envelope including:
• User guide
• Wiring diagram
• Labels with bar code
• Riello burner for installer fitting
• Burner Owner's Manual
1.9.2 Fixed protection
In order to avoid accidental contact with the mova-
ble parts of the machine, check if the following fixed
protections have been properly installed:
• Grille on air intake.
• Appliance infill panels.
• Burner casing.
Legend
1. Secondary heat exchangers
2. Combustion chamber
3. Rear flue manifold
4. Front flue manifold
5. Heat exchanger inspection door
6. Flue connection
7. Burner mounting
8. Flame spy hole
9. Fan
10. Fan motor
11. Electrical panel
12. Fan-limit tri-thermostat
13. Smartcom controller
1.10 Structure
Figure 1.
Component layout
7
