andrews R18 Series, Техническая документация инструкция

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18IP22B
10
Fig. 11 Parallel displacement of the heating curve
2.3.2 EW Control option Electronic Modulating version with outside temperature
compensation and night-time temperature reduction
This system (indicated by the EW control option) uses the
above mentioned PID regulator to regulate the boiler. The “EW”
control system maintains the advantages of the “EM” type boiler
and adds to it the possibility of automatically changing the flow
temperature according to the outside temperature and the
required heating curve. The unit’s built-in week-clock also
means that a night-time and weekend temperature reduction is
possible with a “EW” control system.
Weather-dependent setpoint shift
The RWF40 can be configured in such a way that, if a Ni1000
outside sensor (e.g. QAC22) is connected, a weather-depen-
dent setpoint shift is implemented.
The minimum and maximum setpoint values can be set by the
lower setpoint limit
*
SPL
+
and the upper setpoint limit
*
SPH
+
.
Parameter
*
P
+
can be used to apply a parallel displacement to
the heating curve.
* Each RWF40 must have its own separate outside
sensor connected (no parallel connection)!
Heating curve slope
Slope
*
H
+
of the heating curve can be used to adjust the set-
point in response to the outside temperature, as shown in the
diagram. The common origin of the heating curves is set at
(20 °C / 20 °C). The effective range of the weather-adjusted
setpoint is restricted by the setpoint limits
****
SPH
++++
and
****
SPL
+
.