S-CB Px 120 Manual
31
9.
ELECTRICAL INSTALLATION
9.1.
General
All the wiring is connected by means of screw terminals. The connections are placed on top of the display panel
and can be accessed by removing the boiler front door and the connector protection cover.
The boiler pump must be controlled by the S-CB Px 120 boiler control. If, for any reason, an external pump
control is applied
without written approval of Strebel Ltd
, the complete warranty on the S-CB Px 120 boiler
and all supplied parts will become invalid.
•
For operation the boiler needs a power supply of 230 Vac 50Hz.
•
The boiler connections are not life/neutral sensitive (the boiler is not phase-sensitive).
•
The wiring for the connections can be entered at the bottom of the boiler through the cable glands.
•
NOTICE: Before starting to work on the boiler, it must be switched off and the power supply to the boiler must
be disconnected.
•
Electrical wiring should be installed according to all applicable standards and regulations.
•
Working on the boiler should only be done by a qualified service engineer that is skilled in working on electri-
cal installations and according to all applicable standards and regulations.
9.2.
Electrical connections
An extensive explanation of the connections and their functions is given in the table in the next section.
9.3.
Functions of the connections
1-2
OUTDOOR SENSOR
When an outside temperature sensor is connected, the boiler will control the flow water temperature by
using a calculated value, which is relative to the outside temperature.
PARAMETER: No parameter settings needed.
3-4
EXTERNAL FLOW SENSOR
When a low loss header is used, this external flow sensor measures the flow temperature at the sys-
tem side. The sensor must be mounted on the supply pipe at the system side, just behind the low loss
header. NOTICE: The sensor is required when several boilers are cascaded with the internal cascade
manager.
PARAMETER: No parameter settings needed.
5-6
CALORIFIER SENSOR or THERMOSTAT
When an indirect hot water tank / calorifier is installed, a hot water sensor must be connected to these
terminals. In case of a DHW heat demand, the set point will be shown in the display. An external on/off
thermostat can also be connected to these terminals. When there is heat demand (terminal 5 and 6
are bridged) the flow temperature going to the heating coil(s) will be shown in the display.
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