Closed Expansion Tank System; Vma - Anti-Condensation Mixing Valve - It Is Mandatory (Purchased As Optional) - La Nordica WF25 DsA Manual Del Usuario

4. AUTOMATIC THERMAL DISCHARGE VALVE DSA 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)
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.

CLOSED expansion Tank system

It is COMPULSORY that the CLOSED expansion Tank system is provided with:
1. A SAFETY VALVE - maximum operation pressure allowed for the system is : see DECLARATION OF PERFORMANCE - CE
MARKING INFORMATION. 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)
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: 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.
IT IS MANDATORY 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 VAST)
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.

VMA - ANTI-CONDENSATION MIXING VALVE - IT IS MANDATORY (purchased as OPTIONAL)

The Anti-condensation mixing valve finds applications in solid fuel heat generators as it prevents cold water return in the exchanger.
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.
24 ENgLIsH