20IP18B
8
2.3
Principle of regulation
Electronic Modulating version
This type of boiler control regulation (indicated by the EM
control option) uses a built-in PID regulator to maintain a con-
stant flow temperature to within a minimum temperature devia-
tion of +1 to -1 K.
This system allows the user to fine-tune the reaction of the
boiler to the heating system or application process.
An added bonus with this “EM” control system is that it allows a
Building Management system to influence the flow temperature
using a 0 - 10 VDC control signal.
Boiler temperature controller RWF40
A Process value (actual temperature)
B Set point (temperature)
C Burner enable (not applicable)
D Mod. indicator (decrease fire rate)
E Mod. indicator (increase fire rate)
F Two-stage firing (not applicable)
G Limit comparator
H Manual operation
The keys K-L-M-N are used for displaying
values and changing parameters in the
temperature controllers configuration.
K Down key (reduce value)
L Up key (increase value)
M Programme key
N Exit key
Assignment of levels
All levels can be accessed from the basic
display via the
button, as shown in
PGM
the diagram. The upper actual value dis-
play (red) indicates the actual value and
the parameter values for the various levels.
The setpoint and the parameters are
indicated in the lower setpoint display
(green).
1. After using
*
PGM
+
to step through all
the parameters of a level, an automatic
return occurs after the last parameter has
been confirmed.
Summary of Contents for ECONOPAK R2000
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