Installation manual

Before the gas pipes connection to the boiler the gas pipes must be tested and revised. All gas joints after
their connection to the boiler must be tested using a gas detector or foaming solution. Maximum natural gas inlet
pressure is 20 mbar. The gas pipes threaded joints must never be strained by additional forces.
6.1.3.Connection to the electricity network
The boiler is equipped with a movable three-core cable. It is connected to the network socket positioned
maximum 1 m from the boiler. The socket must meet the protection by zeroing or grounding and must have a
phase conductor installed in the left plug contact when the earth-plug is upward. The boiler doesn’t work if there
is a different connection. It is forbidden to use the adaptors and extension cords. Installation of a socket,
connection of an indoor thermostat and the service of boiler electric part can only be done by a person holding
an adequate authorization for a professional electrotechnic qualification.
6.1.4. Connection of an space thermostat ( regulator)
The space thermostat is not a part of boiler. At the customer ´s request it is possible to connect the space
thermostat into the boiler. The voltage for space thermostat switching contacts is 24 V. The space thermostat
connection to the boiler is shown in the wiring diagram see Fig.No.5,6. The terminals for the space thermostat
connection into the boiler are by the manufacturer interconnected through a jumper . This jumper must be
removed when the space thermostat is connected to the terminals.
6.1.5 Smoke outlet
6.1.5.1. Connection to a chimney ( VIADRUS CLEO K)
VIADRUS CLEO K, the wall gas boiler is connected to the chimney through the neck / socket φ 130mm . The
connection to the chimney according to the valid regulations must have the 3% chimney gradient in direction to
the boiler. The flue gases reflux fuse ( flue gases thermostat ) must not be put out of operation. It is forbidden
to interfere with the flue gases reflux fuse in an unskilled way. For the flue gases reflux fuse installation and
the exchange of its faulty parts there only can be used the original parts delivered by the manufacturer. Above
the boiler there must be kept a straight minimum 0,3 – 0,5 m long section.
6.1.5.2. Connection to the coaxial tubes ( VIADRUS CLEO T)
Flue gases outlet and the combustion air inlet are carried out through a doubled piping delivered by the
manufacturer. This piping can be ordered in a sufficient need according to the project( horizontal or vertical flue
gases outlet) incl. the sealing gaskets, passages trough the roof etc.
The conditions for the flue gases outlet outfall on the external wall :
- the outfall must protrude min. 150mm out of the building external wall
- min. height above the ground into the area inaccessible for public is 1 m
- min. height above the ground into the area accessible for public is 2 m
- the outfall must not be in an explosive and combustible environment
- if in the area in direction upwards there are combustible materials on the building it is necessary to keep a
vertical 1,5 m distance from the outfall
The maximum flue gases outfall maximum lengths permitted by the manufacturer for VIADRUS CLEO T
version:
- horizontal smoke outlet 3 m – measured from the elbow up to the outfall on the façade
- vertical smoke outlet is 2,7 m – measured from the boiler to the lower edge of the roof superstructure
- every inserted 90° elbow shortens this length by 0,75 m and 45°elbow by 0,5m.
The smoke outlet must have minimum 3% gradient from the boiler in direction downwards.
Fig. No. 10 Coaxial tube connection
Legend: flue gases collector/ gasket / enclosure wall/ coaxial tube / manostat/ ventilator