Automatic Thermostatic Mixer Valve (Mandatory) - LA NORDICA Extraflame LP30 Benutzerhandbuch

FILLING THE SYSTEM
Once the hydraulic connections have been carried out,
connect the system. Open all air venting valves of radiators,
boiler and system. Gradually open the load cock ensuring that
the air venting valves work regularly. Using the manometer,
check that the system is pressurised. In case of closed vessel
system, reach the pressure of about 0.11 – 0.12 MPa (1.1 – 1.2
bar). For open vessel systems, the pressure in the lowest part
of the boiler is given by the height of the vessel. Close the load
cock and again release the air from the boiler through the
venting valve.
AUTOMATIC THERMOSTATIC MIXER VALVE
(MANDATORY)
The automatic thermostatic mixing valve fi nds applications
in solid fuel boilers as it prevents cold water return into the
exchanger. Routes 1 and 3 are always open and, together
with the pump installed on the return, they guarantee water
A
36
E
C
D
B
circulation inside the biomass boiler exchanger. An elevated
return temperature, allows effi ciency improvement, reduces
formation of combustion product condensation and prolongs
the boiler life span. Valves on the market have diff erent
calibrations. Extrafl ame advises use of 55°C model with 1"
hydraulic connections. Once the valve calibration temperature
is reached, route 2 is opened and the boiler water goes to the
system via the fl ow. Extrafl ame recommends not to use this
device whenever the DHW is produced through an instant
heat exchanger.
Flow
Thermometer
Balance
Valve
Return
system loading unit
A = primary air Ø 60 mm
B = fl ue gas exhaust pipe Ø 120 mm
C = boiler 1" fl ow/outlet
D = boiler 1" return/inlet
E = 3 bar 1/2 " safety drain
INSTALLATION AND HYDRAULIC PLANT SAFETY DEVICES
Safety valve
discharge
Manometer
Flow
automatic
thermostatic
mixer valve
55°C
3
1 2