Closed Expansion Tank System; Anti-Condensation Mixing Valve - (Purchased As Optional); Automatic Thermal Discharge Valve Dsa - (Purchased As Optional) - LA NORDICA WF25 DSA Notice D'utilisation Et D'entretien

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 VALV 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.
6. SAFETY DEVICES envisioned by Regulations in vigour.
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. ANTI-CONDENSATION MIXING VALVE – (see chapter 2.3)
ATTENTION: temperature safety sensors must be in place on the machine or 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. 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.
ATTENTION: For no reason must the fire be ignited before the system has been completely filled with water; doing this would
lead to serious damage of the entire structure. The system must be filled by means of the loading pipe directly from the open tank
in a way to prevent an excessive pressure of the water network deforming the body of the thermo heating stove.
The system must be kept constantly full of water even during the periods when the use of the thermo-heating stove is not requested. During
the winter, inactivity must be faced with the addition of antifreeze.
2.2.

CLOSED expansion Tank system

It is COMPULSORY that the CLOSED expansion Tank system is provided with:
1. A 2,5 bar SAFETY VALVE:maximum operation pressure allowed for the system is 2,5 bar (equal to 30 m of the water column). Higher
pressures can cause deformation and breakage of the boiler body. ATTENTION: The inside diameter of the supply pipe which
connects the thermoproduct with the security valve must be equal to the internal diameter of the supply junction present in the
thermoproduct. The above mentioned connection pipe must be without siphoning parts.
2. ANTI-CONDENSATION MIXING VALVE – (see chapter 2.3)
3. AUTOMATIC THERMAL DISCHARGE VALVE DSA or TEMPERATURE SAFETY RELIEF VALVE, with double safety sensor
4. CLOSED EXPANSION Tank can be installed on the thermo product return pipe. ATTENTION: The inside diameter of the return pipe
which connects the thermoproduct with the closed expansion vessel must be equal to the internal diameter of the return junction
present in the thermoproduct. The above mentioned connection pipe must be without siphoning parts.
5. PUMP CONTROL THERMOSTAT
6. NOISE ALARM ACTIVATION THERMOSTAT
7. NOISE ALARM
8. TEMPERATURE INDICATOR
9. PRESSURE INDICATOR
10. PUMP SYSTEM
ATTENTION: safety sensors must be in place on the machine according to that stated in chapter 2.2. 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.
IT IS MA NDATORY that the thermo products for domestic heating inserted in CLOSED Tank heating systems, must be internally equipped,
with a cooling circuit, prepared by the unit manufacturer, which is activated by a thermal safety valve (see chapter 2.4) which does not
require auxiliary power and can guarantee that the standard set temperature limit is not exceeded. Connection between the power supply
unit and the valve must be free from interceptions. Cooling circuit upstream pressure must be at least 1,5 bar.
2.3.

ANTI-CONDENSATION MIXING VALVE - (purchased as OPTIONAL)

The Anti-condensation mixing valve finds applications in solid fuel heat generators as it prevents cold water return in the exchanger.
Picture 1 at page 48. Routes 1 and 3 are always open and, along with the pump installed on the return (R), they guarantee water circulation
inside the biomass boiler exchanger (CB). An elevated return temperature, allows efficiency improvement, reduces formation of smoke
condensation and prolongs the boiler life span.
Valves on the market have different calibrations. NORDICA advises use of model 55°c with 1" hydraulic connections. Once the valve
calibration temperature is reached, route 2 opens and the boiler water goes to the system via the flow (M).
IMPORTANT lack of installation of the device voids the heat exchanger warranty.
2.4.

AUTOMATIC THERMAL DISCHARGE VALVE DSA - (purchased as OPTIONAL)

Solid fuel thermo products must be installed with safety devices determined by laws in vigour.
For this reason the thermo products is equipped with a heat discharge coil.
The heat discharge coil must have one side connected to the water network (A -
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TERMOCAMINO WF25 DSA - WF25X DSA - WF PLUS DSA
Picture 1 at page 48 - chap. Technical data sheets) and
6095102 - IT-EN-DE-FR