7
2
TECHNICAL DATA S-CB
+
400 AND S-CB
+
550
2.1
Introduction
The S-CB+ 400 & 550 heating boilers are central heating boilers with a maximum high efficiency. Such performance
can also be reached by using a special heat exchanger made of stainless steel. The heat exchanger helps to cool
down the flue gases below their condensation point; through this condensing of the flue gases extra heat is released.
This has an immediate positive effect on the efficiency, exceeding the 100%.
The S-CB
+
boiler is standard set for Natural gas G20
Gases used must comply with the European standard EN 437.
Fuel used should have sulphur rates within the European standard, a maximum annual peak over a short period of
time of 150 mg/m
3
and an annual average of 30 mg/m
3
.
Boiler control includes:
▪
Boiler pump control.
▪
Cascade control for up to six boilers.
▪
Remote signals from each burner:
- Lock-out indication.
- Heat demand indication.
- Burner burning indication.
▪
Weather compensation control.
▪
Calorifier control.
Connections for:
▪
0-10 VDC remote flow temperature (set point) control.
▪
0-10 VDC remote burner input control.
▪
Outside temperature sensor.
▪
External calorifier pump or diverter valve.
Flue gas
Because the flue gases can have a low temperature, the boiler needs to have a high efficiency approved stainless
steel flue gas system. Also, plastics of the right temperature class are allowed. For details, see applicable section.
Aluminium flue gas systems are never allowed to be connected to S-CB
+
boilers.
Cascade control
When using the integrated cascade control, a maximum of six boilers (meaning twelve burners) can be controlled in
a cascade configuration. When using dedicated control, this number can be increased at will.
0-10 VDC connection available
The boiler flow temperature or burner input can be controlled by an external 0-10 VDC signal. If several boilers are
in cascade, using the integrated cascade control, the signal should be directed to the master boiler only. When using
alternative control systems, all boilers in cascade systems may be controlled using these 0-10 VDC signals. A signal
of 1,48 Volt will switch on the boiler(s), less than 1,4 Volt will switch off the boiler(s).
Time program
For both central heating and hot water function of the boiler, time programs with three programmable periods per day
are available. These time programs can be set and activated directly at the boiler control panel.
