S-CB
+
Boiler Range Manual
38
7-8
GENERAL BLOCKING
A heat demand that will start the burner will be blocked when terminals 7 and 8 are not bridged. This
connection is for the use of external safety devices (terminals must be bridged for allowing burner to
fire).
9-10
EMPTY
11-12
EXTERNAL WATER PRESSURE SWITCH
A water pressure sensor is mounted in the boiler. As an option a water pressure switch can be in-
stalled. The sensor can be replaced by the water pressure switch, which can be wired to the terminals.
When terminals 11-12 are not bridged, the boiler will lock-out. PARAMETER: A parameter change is
needed.
13-14
ON/OFF STAT OR OPENTHERM HEATING CIRCUIT
OPTION 1: An ON/OFF thermostat can be connected. The boiler will use the set/programmed flow
temperature for the heating system when these terminals 13 and 14 are bridged.
OPTION 2: An OpenTherm (OT) controller can be connected to the terminals 13 and 14. The boiler
software will detect and use this OpenTherm signal automatically.
15-16
0-10 VDC CONTROL SIGNAL
These terminals are used for an external 0-10 VDC control signal. PARAMETER: A parameter change
is needed. NOTICE: Terminal 15 [+] (positive) and terminal 16 [-] (negative).
17-18
CASCADE CONNECTION
These connections are used when boilers are cascaded with the internal cascade manager for control-
ling the total cascade. NOTICE: Connect all terminals 17 and all terminals 18 together, do not switch
between these terminals.
19-20
LOCK-OUT OR PUMP ON/OFF
This contact is N.O. (normally open). When the unit is in lock-out this contact will close.
This contact can also be used for the switching of a pump with a separate control input connection;
then a parameter change is needed.
21-22
BURNER BURNING OR EXTRA BOILER OR PUMP ON/OFF
This contact is N.O. (normally open). When the unit starts the burner and detects the flame, this con-
tact will be closed. This contact can also be used to control an external boiler or for the switching of a
pump with a separate control input connection; in both latter cases a parameter change is needed.
23-24
HEAT DEMAND OR PUMP ON/OFF
This contact is N.O. (normally open). When the unit receives any heat demand this contact will close.
This contact can also be used for the switching of a pump with a separate control input connection;
then a parameter change is needed.
25-26-27
CH SYSTEM PUMP P3
Connections for a central heating system pump (P3).
Nominal pump current of P3 may not exceed 2 A, therefore its power may not exceed 460 W, see also
§ 0.
28-29-30-31
DIVERTER VALVE CALORIFIER
When using a calorifier/hot water tank, a 3-way valve or a pump (P2) can be used to divert hot water to
the heating coil of the calorifier/tank. This 3-way valve will open, when the hot water storage
tank/calorifier has a heat demand. PARAMETER: A parameter change is needed.
28 = L2 wire (heating position); 29 = Neutral wire; 30 = Ground wire; 31 = L1 wire (hot water position).
The inrush current of the 3-way valve may not exceed 3 A, see also § 0.
29-30-31
CALORIFIER PUMP P2
When using a calorifier/hot water tank, a 3-way valve or a pump (P2) can be used to divert hot water to
the heating coil of the calorifier/tank. This pump will start when the hot water storage tank/calorifier
creates a hot water demand. PARAMETER: A parameter change is needed.
Nominal pump current of P2 may not exceed 2 A, therefore its power may not exceed 460 W, see also
§ 0.
32-33-34
POWER SUPPLY
The power supply connection of the unit. 32 = Phase wire; 33 = Ground wire; 34 = Neutral wire.
Summary of Contents for S-CB+ Series
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