Open Expansion Vessel System - LA NORDICA Termorosa DSA Handbuch

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 local chimneysweep must be informed of the installation of the thermocooker, so that he can check its correct
connection to the flue and the level of efficiency of the flue itself.
NO MODIFICATIONS CAN BE CARRIED OUT TO THE APPLIANCE.
Before installation, check whether your floor can support the weight of the Thermocooker.
WARNING: ensure the device is placed perfectly level and that the diameter of the smoke exhaust pipe is that
required.
Connection of more that one cooker to the same chimney is not allowed.
It is advisable to have your local chimneysweep check both the connection to the chimney and the sufficient flow of air
for combustion in the place of installation.
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 unused flue gas exhaust stub pipe must be covered with its respective cap.
The DSA thermo cooker models, can be installed in both an OPEN expansion VESSEL system (see chapter 3.1) and
a CLOSED expansion VESSEL system (see chapter 3.2).
3.1.

OPEN expansion VESSEL system

It is COMPULSORY that the OPEN expansion VESSEL 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. HEAT 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 installati on 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 1,5bar: maximum operation pressure allowed for the system is 1,5 bar (equal to 15m of
the water column). Higher pressures can cause deformation and breakage of the boiler body.
6. SAFETY DEVICES required by the Regulation in force on the matter.
7. CIRCULATION PUMP: It would be better to install it on the return in order to avoid that it could disconnect itself at
very high water temperatures but checking that it does not drive water in the open expansion tank otherwise it
should cause a continuous water oxygenation with consequent, fast corrosion of boiler body. It must be not to
avoid a forced circulation in the open expansion tank. Furthermore it must be electrically connected to a
thermostat or a electronic control unit that can be purchased with the thermo-fireplace as OPTIONAL part.
8. AUTOMATIC THERMOSTATIC MIXING VALVE – (see chapter 3.3)
IMPORTANT: temperature safety sensors must be in place on the machine at a distance no greater than 30 cm from
the flow connection of the thermo-product.
Whenever the thermo products lack a device, those missing can be installed on the thermo product flow pipe, within a
distance no greater than 1m from the thermo product.
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DSA
TERMOROSA
7097501 Rev.04 – EN