page 4
1. PRINCIPAL CHARACTERISTICS
1.1 APPLIANCE CLASSIFICATION
The W, WR, and WD air heaters are defined as
“Independent gas-fired convection heaters
equipped with a fan in the combustion circuit”.
In addition, they are classified according to
harmonised European standards EN 437 and
prEN 1266 into:
category - according to the types of gas, at the
different supply pressures, that they can use;
type - according to the possible methods to
exhaust the combustion productions (see also
4.2.1).
1) Category II
2H3+
the heater is equipped to use gas that belongs to
two families. The atmospheric burner can be fed
with gas from the second group (natural gas -
group H) and gas from the third group (butane
and propane at the two pressure ratings 28-30
and 37 mbar)
2) Type C
12
The combustion circuit is sealed with respect to
the environment in which it is installed and the
combustion air supply and combustion product
exhaust lines are connected outside the room by
means of flues which pass directly through the
outside wall of the room.
3) Type C
52
The combustion circuit is hermetically sealed
with respect to the environment in which it is
installed and the combustion air supply and
combustion product exhaust lines are connected
outside the room by means of separate ducts
with terminals which need not necessarily be
adjacent to each other.
1.2 CERTIFICATION - EC MARKING
The W, WR, and WD air heaters, as previously
described and classified, have obtained the “CE
type test certificate” in conformity with EEC
Directive 90/396 and with reference to the
harmonised European standard prEN 1266.
Attaching the CE marking shown below also
guarantees that the appliance conforms with
EEC directive 73/23 (“Low voltage”) through the
harmonised standard EN 60335-1 and EEC
directive 89/336 (“Electromagnetic compatibility”)
through the standards EN 50081-1 and 50082-1.
SECTION 1 - GENERAL INFORMATION
It is important to point out that, to protect the end
user, attaching the CE marking means that the
manufacturer must submit a declaration of
conformity for the entire line of products with the
certified characteristics and performance ratings.
This is possible through the use, by the
manufacturer, of a Quality Assurance system.
The efficiency of that system is controlled by the
Organisation which issued the certification.
1.3 FUNCTIONAL DESCRIPTION
The system is made up of independent units that
are easily installed. There are three versions of
these units:
- For wall installation (W version), in spaces
under windows, or in all situations where free
space is available or where this solution would
present technical or functional advantages.
- For ceiling installation (WR version), in
rooms, where there is not enough free space
on the walls.
- For ceiling installation, with duct con-
nection (WD version), with installation of
ducts for distributing the treated air. This
makes it possible for a single unit to serve
several rooms, with the possibility of changing
the air with fresh air.
The W, WR, and WD air heaters consist basically
of a heat exchanger unit which exchanges heat
between the combustion products of a gas burner
and the air flow delivered by a fan.
The air heater is also equipped with an electronic
control panel (operated by remote control for
installation on the ceiling, installed on the unit if
the unit is mounted on the wall) which indicates
the unit’s main functions and includes a
thermostat.
The technology used to build the burner also
ensures very low emission of polluting NOx
(nitrogen oxides) for this category of appliance.
0694
page 33
8.7 ELECTRODES
Disconnect the cable connection on the control
equipment. Remove the fastening screws and
pull out the electrodes from the burner plate.
Insert the new electrodes, attach the supports
and re-establish the electrical connection. To
check the position of the electrodes on the
burner, remove the combustion chamber door,
making sure not to damage the seal gasket. The
position of the electrodes with respect to the
burner must correspond to what is shown in
figure 30. Replace the door while checking that
the relative gasket is in the correct position.
8.8 FLUE EXHAUST FAN
Disconnect the motor electrical connection and
loosen the three scroll fastening screws. Gently
remove the motor-fan unit and, respecting the
original position, insert the new unit (fig. 31).
Tighten the screws and re-establish the electrical
connection. Make sure the fan rotates correctly
and without friction.
IMPORTANT! To access the flue gas expeller in
the WR and WD versions for ceiling installation,
free the inside intake duct by undoing the
fastenings and sliding the external duct along
the aluminum sheath installed in the wall. When
you have changed it, make sure that you put the
duct correctly back in place and check that the
connections are sealed well.
8.9 CONVECTION FAN
Disconnect the electrical connection from the
fan motor connections. Unscrew the screws that
attach the fan support to the air heater’s back
panel. Insert the new fan, including supports, in
its position (fig. 32). Attach the fan support using
the screws that were previously removed and re-
establish the electrical connection.
Fig. 30
PLACEMENT OF THE ELECTRODES
3 mm
Ignition
electrode
Detection
electrode
Fig. 32
CHANGING THE FAN
Screws
Fan
Supports
Screws
Fig. 31
CHANGING THE FLUE GAS EXPELLER
Motor / fan
Combustion
chamber
Exchanger
Gasket
Содержание W
Страница 2: ......
