General Precautions; Installation Regulations; Important; Open Expansion Tank System - LA NORDICA TermoRossella Plus DSA Instructions Pour L'installation, L'utilisation Et L'entretien

1. GENERAL PRECAUTIONS

La NORDICA S.p.A. responsibility is limited to the supply of the appliance.
The installation must be carried out scrupulously according to the instructions provided in this manual and the rules of the profession.
Installation must only be carried out by a qualified technician who works on behalf of companies suitable to assume the entire responsibility
of the system as a whole.
La NORDICA S.p.A. declines any responsibility for the product that has been modified without written authorisation as well as
for the use of non-original spare parts.

2. INSTALLATION REGULATIONS

Installation of the thermo product and auxiliary equipment in relation to the heating system must comply with all current Standards and
Regulations and to those envisioned by the law.
The installation and the relating to the connections of the system, the commissioning and the check of the correct functioning must
be carried out in compliance with the regulations in force by authorised professional personnel with the requisites required by the law,
being national, regional, provincial or town council present in the country within which the appliance is installed, besides these present
instructions.
Installation must be carried out by authorised personnel who must provide the buyer with a system declaration of conformity and will
assume full responsibility for final installation and as a consequence the correct functioning of the installed product.
NO MODIFICATIONS CAN BE CARRIED OUT TO THE APPLIANCE. NORDICA S.p.A. cannot be held responsible for lack of respect
for such precautions.
Before installation, accurately wash the pipes of the system in order to remove any residuals that could compromise the correct functioning
of the appliance.

IMPORTANT:

a) In case of water leaking, close the water supply and promptly warn the after sales technical service;
b) The system working pressure must periodically be checked.
c) If not using the boiler for a long period of time, it is recommended that the after sales technical service is contacted to carry out at
least the following operations:
• close the water taps of both the thermal system and the domestic hot water system;
• empty the thermal system and the domestic hot water system if there is risk of freezing.
LA NORDICA S.p.A. declines all responsibility for damage to things and/or persons caused by the system. In addition, it is not
responsible for any product modified without authorisation and even less for the use of non original spare parts.
Your regular local chimney sweep must be informed about the installation of the appliance so that he can check the correct connection to
the chimney.
Before installing the appliance, carry out the following checks:
• Make sure that the floor can support the weight of the appliance, and if it is made of flammable material, provide suitable insulation.
• Make sure that there is adequate ventilation (by means of an air intake, see chapter 6) in the room where the appliance is to be
installed.
• Do not install the appliance in rooms containing collective ventilation ducts, hoods with or without extractor, type B gas appliances,
heat pumps, or other appliances that, operating at the same time, can put the room in depression (ref. UNI 10683/98 standard)
• Make sure that the flue and the pipes to which the appliance will be connected are suitable for its operation.
• The diameter of the opening for connection to the chimney must at least correspond to the diameter of the flue gas pipe. The
opening must be equipped with a wall connection for the insertion of the exhaust pipe and a rosette.
The DSA thermo appliances, can be installed in both an OPEN expansion Tank system (see chapter 2.1) and a CLOSED expansion Tank
system (see chapter 2.2).

2.1. OPEN expansion Tank system

It is COMPULSORY that the OPEN expansion Tank system is provided with:
1. OPEN EXPANSION Tank: which has a capacity of 10% of total water content of thermo-product and of the installation. This is
installed at the highest point of the system, at least 2 m over the radiator that is at the highest level.
2. SAFETY PIPE : that connects through the shortest way, without descending or siphoning parts, the delivery of thermo-product to the
upper side of open expansion tank. The minimum diameter of safety pipe is 1" gas.
3. LOAD PIPE : which connects the bottom of open expansion tank with the return pipe of installation. The minimum diameter must
be ¾" gas. All those parts must no have for any reason meditate intercept bodies that could accidentally exclude them and must be
placed in rooms which are protected from frost. On the contrary, if they freeze, the boiler body could break or even explode. In case
of frost placing it will be right to add a proper percentage of antifreeze liquid to the water of installation in order to delete the whole
problem. In no way there must be water circulation in the open expansion tank between the safety and loading pipe. This would cause
the water oxygenation and the consequent corrosion of thermo-product and installation in a very short time.
4. THERMAL DISCHARGE VALVE which is a further positive safety that prevents the boiling even when electric energy is missing. It is
made by a valve cover like a pressure safety valve which differs from it as it opens by reaching a pre-calibrated temperature (normally
at 94 – 95°C) and unload hot water from the installation delivery. This will be replaced with as much cold water coming from the open
expansion tank loading pipe of open tank by draining away the excessive heat.
5. SAFETY VALVE FROM 1,5 bar: maximum operation pressure allowed for the system is 1,5 bar (equal to 15 m of the water column).
Higher pressures can cause deformation and breakage of the boiler body.
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