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Cooling circuit upstream pressure must be at least 1.5 bar.
3 bar safety valve
Thermal
safety
valve 95° C
AUTOMATIC THERMOSTATIC VALVE
The automatic thermostatic mixing valve fi nds applications in solid fuel boilers as it prevents cold water
return in the exchanger.
Routes 1 and 3 are always open and, together with the pump installed on the return (R), they guarantee
water circulation inside the biomass boiler exchanger.
An elevated return temperature, allows effi ciency improvement, reduces formation of smoke condensation
and prolongs the boiler life span.
Valves on the market have diff erent calibrations. Extrafl ame advises use of model 55°c 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 (M).
Lack of installation of the device voids the heat exchanger warranty (see "WARRANTY" chapter).
INSTALLATION AND SAFETY DEVICES
The installation and relative plant connections, commissioning and inspection of correct functioning must
be carried out perfectly by professionally authorised staff (Ministerial Decree 22 January 2008 n. 37), in
total compliance with Standards in force, both national and regional, as well as these instructions.
Extrafl ame S.p.A. declines all responsibility for damages to objects and/or persons caused by the plant.
28
Thermometer
Manometer
Load
Network
Expansion
vessel
Pump
1
fi gure 8.4
Chapter 8
Flow
Balance
valve
3
2
Return
SAFETY DEVICES
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