19
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. AUTOMATIC THERMOSTATIC MIXING VALVE
– (see chapter
IMPORTANT
: 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.
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.
3.2. CLOSED expansion Tank system
It is
COMPULSORY
that the CLOSED expansion Tank system is provided with:
1. A 3 bar SAFETY VALVE
: maximum operation pressure allowed for the system is 3 bar (equal to 30 m of the water column). Higher
pressures can cause deformation and breakage of the boiler body
2. AUTOMATIC THERMOSTATIC MIXING VALVE
– (see chapter
3. HEAT DISCHARGE VALVE
or
HEAT SAFETY DISCHARGE
(positive safety, therefore, this continues discharge, should the valve
be damaged)
4. CLOSED EXPANSION Tank
5. PUMP CONTROL THERMOSTAT
6. NOISE ALARM ACTIVATION THERMOSTAT
7. NOISE ALARM
8. TEMPERATURE INDICATOR
9. PRESSURE INDICATOR
10. PUMP SYSTEM
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.
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
) 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.
3.3. AUTOMATIC THERMOSTATIC MIXER VALVE - (OPTIONAL)
The automatic thermostatic mixer 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.
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.
3.4. HEAT DISCHARGE VALVE - (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. (see Pos.6 chapter
)
The heat discharge coil must have one side connected to the water network (
A
) and the other rot drainage network (
C
). When the safety
temperature is reached, the heat discharge valve, 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.
