Vma - Anti-Condensation Mixing Valve - It Is Mandatory (Purchased As Optional); System Connection And Filling - Nordica TERMOCAMINO 650 Manuel Utilisateur

4. AUTOMATIC 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.
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.

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- chapter INSTALLATION LAY-OUT). 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.

SYSTEM CONNECTION AND FILLING

Some examples, purely indicative of the installation, are reported at chapter INSTALLATION LAY-OUT, while the connections to the
thermoproduct are reported at chapter DIMENSIONI.
WE RECOMMEND USING AN "INTERSECTING FLOW" INSTALLATION (DELIVERY ON THE RIGHT WITH RETURN
ON THE LEFT, OR DELIVERY ON THE LEFT WITH RETURN ON THE RIGHT).
ATTENTION: The filling of the system must take place exclusively by the natural fall of the water from the open
expansion tank through the feed pipe in order to avoid that a too high water system grid pressure could change or
cause the explosion of boiler body.
During this phase, open all the bleed valves of the radiators to prevent the formation of air sacks, checking the outlet of water to avoid
unpleasant floodings.
The watertight test of the installation is performed with the pressure of expansion tank open.
The installation must always be full of water even when the thermo-product is not used. During winter season the
non use has to be faced by adding antifreeze substances.
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