Operating Mode - Riello SC ACS 40 Manual

3. OPERATING MODE

Menu "3. Operating mode" allows selection of the desired
mode of operation: automatic, off, or manual.
To quit the menu, press "esc" or select "Exit operating
mode".
3.1 Automatic
Automatic is the normal operating mode of the controller.
Only automatic mode guarantees correct operation of the
system, taking account of the current temperatures and
the selected parameter settings!
When restarted following a mains power failure, the con-
troller will revert automatically to the operating mode last selected!
3.2 Manual
The relay — and the component connected to the relay contacts — are switched on or off by pressing a key, regardless
of current temperatures and parameter settings. Measured temperatures are also displayed on the screen, for monitoring
and control purposes.
b
When "Manual" mode is activated, current temperatures and parameter settings are ignored by the controller. In this
situation, the system is liable to overheat and suffer serious damage. "Manual" operating mode must be used only
by an expert for conducting functional tests of short duration, or when setting up the controller!
3.3 Off
b
Selecting "Off" mode, all functions of the controller will be deactivated. This should be avoided normally, as it could
cause the solar collector or other system components to overheat, for example. Measured temperatures continue
to be displayed so that the overview remains available.
4. SETTINGS
The parameters essential to normal operation of the con-
troller are presented in menu 4. "Settings".
b
This does not under any circumstances replace the
safety facilities to be provided by the customer!
To quit the menu, press "esc" or select "Exit settings".
4.1 Tset - Setpoint at VFS sensor
The MFWC controller provides a constant recirculation
temperature by controlling the speed of the hot water
pump.
4.2 Tmax = Maximum draw-off temperature at the vortex flow sensor
Maximum allowable temperature at the vortex flow sensor. If Tmax is exceeded, the pump is switched off. If the temper-
ature drops below Tmax, the pump is started again.
b
If temperature settings are too high, this could cause scalding or damage to the system. Scalding protection must
be provided by the customer!
4.3 VFS type
This menu sets the type of vortex flow sensor used.
Settings range: 1-12 l/min, 1-20l/min, 2-40l/min, 5-100l/min, 10-200l/min, 20-400l/min / Default: 2-40 l/min.
4.4 Recirculation
Circulation settings are only available if the Special Features circulation is set.
4.4.1 Recirculation
When "Request" mode is active, the recirculation pump starts when water is drawn off and continues to run until the target
recirculation temperature (Tmin recirculation + hysteresis) is reached at the recirculation sensor.
In "Periods" mode, the recirculation pump runs during the set times and when temperature is below the minimum recircu-
lation temperature setting and continues to run until the target recirculation temperature (Tmin recirculation + hysteresis)
is reached at the recirculation sensor.
Request+Periods: The pump runs during the set times and when temperature is below the minimum recirculation temper-
ature setting or when water is drawn off.
The pump continues to run until the target recirculation temperature (Tmin recirculation + hysteresis) is reached at the
recirculation sensor.
Always on: The recirculation pump is always on during the set times.
Settings range: Request, Periods, Request+Periods, Always on / Default: see table.
4.4.2 Tmin recirculation - minimum temperature at sensor S2
Provided recirculation is enabled, if temperature drops below Tmin recirculation, the pump is switched on.
3.Exit operating mode
3.1.Auto
3.2.Manual
4.1.Tset
4.2.Tmax
18
Info
esc
4.Exit settings
45°C
60°C
Info
esc