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Select Loc’n of shunt pump?
MFR2 ()
MFR3 ()
MFR4 ()
Select Loc’n of shunt pump?
MFR3 ()
MFR4 ()
The Master boiler in a cascade can indicate if
a system fault condition exists, so any boiler
fault, Master or Slave. This can then be used
to indicate to plant monitoring equipment
if any fault exists in the complete system.
If this is required then select the output of
the Master boiler that controls this signal.
Otherwise select ‘None’.
System fault indication
None
PWM/0-10V ()
MFR1 (HC1 pump)
The following outputs can be configured for
this function:
System fault indication
None
PWM/0-10V ()
MFR1 (HC1 pump)
MFR2 (DHW pump)
System fault indication
PWM/0-10V ()
MFR1 (HC1 pump)
MFR2 (DHW pump)
MFR3 (Boiler on indicator)
System fault indication
MFR1 (HC1 pump)
MFR2 (DHW pump)
MFR3 (Boiler on indicator)
MFR4 (Boiler Fault Indicator)
System fault indication
MFR2 (DHW pump)
MFR3 (Boiler on indicator)
MFR4 (Boiler Fault Indicator)
System fault indication
MFR3 (Boiler on indicator)
MFR4 (Boiler Fault Indicator)
The plant may be controlled in a number
of ways:
1. 0-10V analogue input
2. 230V 50Hz switched live input via a ‘Volts
Free’ contact
3. OpenTherm Master controller
0-10V analogue input control
If the Plant cascade control is via a BMS
with a 0-10V signal then this can be selected
and configured next. The following options
are available:
Configure 0-10V input
None
0-10V Capacity
0-10V Temperature
Configure 0-10V input
None
0-10V Capacity
0-10V Temperature
Configure 0-10V input
0-10V Capacity
0-10V Temperature
If 0-10V Temperature control is selected,
then the parameters for the Minimum and
Maximum flow temperature in relation to the
voltage demand range values can be
set.
0-10V input Temp. Setp. 0V:
Temp. setp. 0V
8
ºC
Done
Temp. setp. 0V
8
ºC
Done
0-10V input Temp. Setp. 10V:
Temp. setp. 10V
80
ºC
Done
Temp. setp. 10V
80
ºC
Done
Once 0-10V control is selected a number
of parameters must be defined. The default
settings are as shown below but these can
be hanged if required. To configure the
parameters select ‘Yes’, to accept the current
default settings select ‘No’.
Configure 0-10V parameters
No
Yes
Once ‘Yes’ is selected the parameters can be
set using the following screens.
Voltage demand. This setting determines the
switching point at which demand is expected
by the system, anything below this is at keep
alive voltage:
Configure voltage demand
1.0V
Done
Voltage life zero. This setting determines
the minimum keep alive voltage where the
system expects a voltage to be present on
an operational interface, anything below this
indicates a wiring fault:
Configure voltage life zero
0.0V
Done
Once this level is set, ‘Done’ may be
selected.
The next plant control signal that may be
configured is where a Switched Live signal
is used to generate a demand to enable the
cascade.
SL1 230V demand
Configure SL1
None
Enable
If this signal is to be configured then select
Enable, otherwise select ‘None’. This will then
prompt for a Cascade flow temperature set
point, which will be the target temperature for
the cascade under direct SL1 control.
Plant Setp. SL1
85ºC
Done
Once this level is set, ‘Done’ may be selected.
