Nordica DSA Manuel Utilisateur page 26

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.
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.
Picture 1. 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. La 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.
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
other rot drainage network (C). When the safety temperature is reached, the automatic thermal discharge valve DSA, the bulb of
which is to be connected to attachment B, enables the intake of cold water in the boiler coil, discharging the excess heat out of pipe
C towards a conveniently installed drain. Cooling circuit upstream pressure must be at least 1,5 bar.
WARNING: We cannot be made liable for a wrong operation of the plant, when it does not comply with the provisions
of these instructions or when it uses additional products not suitable for this device (see chapter Thermostatic Valve
VAST TECHNICAL DATA SHEET).
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 DIMENSIONS.
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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(Picture 1 - chap. DIMENSION SHEET- A ) and the
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