Strebel S-CB Px 120, Installation Operating & Maintenance Manual

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S-CB Px 120 Manual 9
2.
TECHNICAL DATA OF THE Strebel S-CB Px 120 BOILER
2.1. Functional introduction
The S-CB Px 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. The heat exchanger
allows the flue gases to cool down below the condensation point, releasing extra heat. This immediately improves
the efficiency considerably.
The S-CB Px 120 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
!
Calorifier control
Connections for:
! Boiler pump
! 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
Cascade control
When using the integrated cascade control, a maximum of twelve boilers can be controlled in a cascade configu-
ration. 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, the signal should be directed to the master boiler only. 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.