Construction
Layout of boiler
Operating principle
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Layout of boiler
The R3400/R3600 boiler consists of the
following main components:
1 Return water connection
2 Flue gas connection
3 Water flow switch
4 Safety valve
5 Flow water connection
6 Filling/draining valve
7 Top plate
8 Plenum
9 Burner
10 1st Heat exchanger
11 Gas filter
12 2nd Heat exchanger
13 Gastrain
14 Frame
15 180° Bend
16 Compensator
17 Flue gas connection
18 Condensate receptacle
19 Flue gas receptacle
20 Combustion chamber
21 Entry electrical connections
22 Syphon
23 Main gas valve
24 Fan
25 Electrical box
26 Control panel
27 Casing
28 Air inlet damper
29 Butterfly valve
30 Main mixing channel
31 Pilot gas valve
32 Pilot mixing channel
33 Boiler pump
34 3rd Heat exchanger (only R3600)
A Air
B Gas
C Flue gasses
D Condensate
Operating principle
The R3400/R3600 is a fully modulating
boiler. The control unit of the boiler
adapts the modulation ratio automati-
cally to the heat demand requested by
the system. This is done by controlling
the speed of the fan. As a result, the
Whirlwind mixing system will adapt the
gas ratio to the chosen fan speed, in
order to maintain the best possible
combustion figures and therewith the
best efficiency. The flue gases created
by the combustion are transported
downwards through
The KM628 control unit can control the
boiler operation based on:
fixed temperature (stand alone
operation);
weather compensated operation (with
optional controller);
with 0-10V external influence
(temperature or capacity) from a buil-
ding management system.
the boiler and leave at the back side
into the chimney connection.
The return water from the system en-
ters the boiler in the lower section,
where is the lowest flue gas tempera-
ture in the boiler. In this section con-
densation takes place. The water is
being transported upwards through the
boiler, in order to leave the boiler at the
top (burner) section. The cross flow
working principle (water up, flue gas
down) ensures the most efficient com-
bustion results.
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