Strebel S-CB+ Series, Installation Operating & Maintenance Manual

Page: 9 / 125

S-CB
+
Boiler Range Manual
9
2 TECHNICAL DATA S-CB
+
BOILERS
2.1 Functional introduction
The S-CB
+
boilers are central heating boilers with a maximum high efficiency. Such a performance can be reached
by, amongst other things, using a special heat exchanger made of stainless steel. This allows the flue gases to cool
down below the condensation point, and so release extra heat. This has an immediate positive impact on the effi-
ciency, exceeding the 100%.
The S-CB
+
boiler is standard set for Natural gas G20
Gases used must meet the European standard EN 437.
Fuel used should have sulphur rates according to 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:

Cascade control for up to twelve boilers

Remote operation and heat demand indication from each boiler

Weather compensation control

Hot water cylinder control
Connections for:

0-10 VDC remote flow temperature (set point) control

0-10 VDC remote burner input control

Outdoor temperature sensor

External hot water cylinder pump or diverter valve
Cascade control
When using the integrated cascade control, a maximum of twelve boilers can be controlled in a cascade configura-
tion. By the use of an appropriate external control, this number may be increased at will.
0-10 VDC connection available
The boiler flow temperature or power input can be controlled by an external 0-10 VDC signal. When a number of
boilers are cascaded, and controlled by the integrated cascade control, the signal should be directed to the master
boiler only. If an alternative control is used, more than one boiler may be controlled by a 0-10 VDC signal. 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 are set and activated by entering the desired settings directly at the boiler
control panel.