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4. Installation
Analogue heat output-based control (%)
The 0-10V signal controls the boiler output between
0% and 100%.
The minimum and maximum values are limited. The
minimum output is linked to the boiler's modulation
depth. The output varies between the minimum and
maximum value on the basis of the value determined
by the controller.
Jumper 2
Input signal
(V)
0 - 2.0
2.0 - 2.2
%
2.0 - 10
(1) Dependent on the minimum modulation depth
(set speeds, standard 20%)
Analogue output (0-10 V)
The temperature or heat output can be chosen for this
feedback message. The two controls are described
briefly below.
A jumper (1) on the interface is used to select either
temperature control () or heat output control (%).
Jumper1
Output
signal (V)
0
0.5
(1)
2.0-10
(1) Dependent on the minimum modulation depth
(set speeds, standard 20%)
4.10.3. Connection possibilities for the PCB
(SCU-S02)
If the boiler is fitted with the control PCB (SCU-S02),
then this is automatically recognised by the automatic
control unit of the boiler.
CAUTION
On removing this PCB, the boiler will show fault code
E:38. To prevent this fault, an auto-detect must be
carried out after removing this PCB.
See chapter: "Carrying out an auto-detect", page
81.
The LED status indicator D3 at the top right of the
control PCB indicates the status:
•
Continuous signal: PCB working normally
•
Flashing signal: No connection
•
No signal: No voltage or faulty PCB (Check the
wiring)
MCA-Pro ISM Rv.4.1 2/2017
Heat output
Description
(%)
0 - 20
Boiler off
(1)
20 - 22
Hysteresis
(1)
20 - 100
Heat output
requested
Temperature
Description
ºF/ºC
0-15
Boiler off
15-20
Alarm
20-100
Heat
output
supplied
X1
Pump
NL
Pump
N
MCA Pro 45/65/90/115
F 4AT
SCU-SO2
X3
X4
3wV
EgV
NC
D
NL
Status
3wV
EgV
Nc
C
No
L
NC D
NL
Nc
C
No
D3
X2
X5
Tsol Gps
Hru
Tsol
Gps
Hru
61
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