
________________________________________________________________________________
16
AST 14 C 259/00
Available
pressure
(mba
r)
3.4 HYDRAULIC UNIT
The arrangement of the hydraulic unit is one of the main factors that allowed to
minimize boiler dimensions. All the parts in "contact" with water, such as 3 bar safety
valve, low water pressure switch and fill cock unit (see picture below) were all indeed
positioned inside circulation pump scroll.
Circulation pump has a fixed speed.
Circulation pump
characteristics:
Max. head: 5 m
Max. operating pressure: 6 bar
Max. circulation temperature:
3 bar safety
valve
Low water
pressure switch
Fill cock
unit
Cold water inlet flow
switch
Wilo circulation
pump
Deaerator
Available
pressure
curve
Flow
rate
(l/h)