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Technical Documentation
Hydraulic circuit.
The hot water for central heating and domestic use is produ-
ced by a primary and a secondary (d.h.w.) circuits that work
as required.
Primary circuit (Boiler Circuit).
The primary circuit, with relevant control and safety devices,
is operated each time either a central heating or d.h.w.
request is made.
Operation.
The heat contained in the fumes produced by combustion
is absorbed by the copper blades of the water-gas primary
exchanger (6) which, in turn, transfers it to the water circula-
ting inside thanks to the boiler circulator (15).
The water is transferred directly into the system or can be
STEMkW Special ed 01/08
Technical Documentation
Legend:
1 - D.h.w. flow switch
2 - Flow limiter
3 - Filling valve
4 - Gas valve
5 - Burner
6 - Primary heat exchanger
7 - Flue hood
8 - Fan
9 - Sealed chamber
10 - Flue pressure switch
11 - Flow probe
12 - Safety thermostat
13 - System expansion vessel
14 - Automatic vent valve
15 - Boiler pump
16 - D.h.w. heat exchanger
17 - 3-way valve (motorized)
18 - Automatic by-pass
19 - Draining valve
20 - 3-bar safety valve
G - Gas supply
AC - Domestic hot water flow
AF - Domestic cold water inlet
R - System return
M - System flow
deviated to the instant stainless steel plate exchanger (16).
This depends on the position of the motorised 3-way diverter
valve (17) which, when idle allows the water to flow to the
d.h.w. exchanger (16) while if a central heating request is
made it deviates the flow to the system's flow (M) and return
(R) pipes.
6
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