TECHNICAL FEATURES AND DIMENSIONS
5
2.3.
Working medium
The ENDS boiler is designed for function with water as working medium, with a maximum
concentration in polypropylene glycose of 50%.
The maximal temperature of the water is 95ºC.
For condensing regim the return
temperature must be maximum 35
o
C.
The boiler is appropriate for open and closed heating
systems with maximal operation pressure 6 bars.
The quality of the heating plant water is an important element for the performance of the
system. The water that enters the heating plant must be clean, transparent and free from salts
and chemical substances. It must be filtered, so as no quantity of sand or mud from the water
supply comes into the boiler.
The hardness of the water must be within permissible limits. In regions where the water is
hard, it is necessary to use water softeners.
Properties of the water for use:
▪
Total hardness lower than 0.9 PH, 0.5 DH
▪
P
2
O
5
–
content 2-3 mg/lt
▪
Alkalinity 200-800 ( mg NaOH/lt )
▪
PH of circulation water 9-9.5
▪
Hydrazine content ( Ν
2
Η
4
) 2 mgr/lt
