42
19-20
LOCK-OUT TOP OR PUMP ON/OFF
This contact is N.O. (normally open max. 230 Vac, 0,8 A). 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, in which
case a parameter change is needed.
21-22
BURNER BURNING TOP OR EXTRA BOILER OR PUMP ON/OFF
This contact is N.O. (normally open max. 230 Vac 0,8 A). When the unit starts the burner and detects the
flame, this contact will be closed. This contact can also be used to control an external (extra) boiler or for
the switching of a pump with a separate control input connection; in the latter cases, a parameter change
is needed.
23-24
BURNER DEMAND TOP OR PUMP ON/OFF
This contact is N.O. (normally open max. 230 Vac 0,8 A). 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, in which case a parameter change is needed.
25-26
LOCK-OUT BOTTOM
This contact is N.O. (normally open max. 230 Vac 0,8 A). When the unit is in lock-out this contact will close.
27-28
BURNER BURNING BOTTOM
This contact is N.O. (normally open max. 230 Vac 0,8 A). When the unit starts the burner and detects the
flame, this contact will be closed. This contact can also be used to control an external (extra) boiler (PA-
RAMETER: A parameter change is needed).
29-30
BURNER DEMAND BOTTOM
This contact is N.O. (normally open max. 230 Vac 0,8 A). When the unit receives any heat demand this
contact will close.
34-35-36
CH SYSTEM PUMP P3
Connection to control a central heating system pump (P3).
Do not use this connection for the power supply of this pump, use an external relay.
37-38-39-40
DIVERTOR 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.
37 = L1 wire (heating position); 38 = Neutral wire; 39 = Ground wire; 40 = L2 wire (hot water position).
38-39-40
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.
Do not use this connection for direct control of this pump- use an external relay.
41-42-43
INTERNAL MAIN POWER CONNECTOR
WARNING: Do not connect the main power supply to this connector! Mains should be connected to the
connecting block as shown on page 40.
CONNECTOR: with this power supply interruption plug 41-42-43 the power supply of the unit can be inter-
rupted. Use this connector for test runs and servicing.
41 = phase wire; 42 = ground wire; 43 = neutral wire.
Careful! After interrupting this plug there will still be voltage on some parts of the system.
We advise to install a separate isolation switch (that switches off all poles) externally so one can work on
the boiler while having all the wiring free of supply voltage.
