Connection Possibilities For The Pcb (Scu- S02) - REMEHA Calenta 25s Installation And Service Manual

Calenta 25s - 28c - 35s - 40c
1
2 %
F 4AT
SCU-SO2
X1
X3
Pump 3wV EgV
N L N C D N L
Pump 3wV EgV
N L N C D N L
040412 - 7600585-01
1 1
T000800-A
D3
X2
X4 X5
Status
Nc C No Tsol Gps Hru
Nc C No Tsol Gps Hru
T001255-B
n 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) Heat output (%) Description
(1)
0 - 2,0
(1)
2,0 - 2,2
%
(1)
2,0 - 10
(1) Dependent on the minimum modulation depth (set speeds, standard 20%)
n 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 (%).
Jumper 1 Output signal (V) Temperature À Description
0,5
*
1 - 10
Jumper 1 Output signal (V) Heat output (%) Description
0
0,5
%
(1)
2,0 - 10
(1) Dependent on the minimum modulation depth (set speeds, standard 20%)
4.10.2. Connection possibilities for the PCB (SCU-
S02)
When using the print PCB (SCU-S02), the housing for control PCBs
will first have to be built in. Refer to the instructions supplied with the
product. 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.
¼ See chapter: "Carrying out an auto-detect", page
70.
0 - 20 Boiler off
20 - 22 Hysteresis
20 - 100 Heat output requested
- Alarm
10 - 100 Delivered temperature
0 - 15 Boiler off
15 - 20 Alarm
20 - 100 Heat output supplied
4. Installation
47