STOKVIS ENERGY SYSTEMS ECONOFLAME R30, Installation Operation & Maintenance

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10-11

 Connection terminals for the 2-wire bus signal (scom-bus). Pay attention to the 
polarity: namely, terminal 10 is earth and 11 is positive.

ST 1.1-1.2

 An OK-signal is available from these terminals (rated at 230 Vac, 1A). This circuit 
is closed in normal operation and will be open if more than 2 identical faults 
occur within 6 minutes (the display will show an error code with a “3” appearing 
above it) or if a fault remains for more than 6 minutes.

ST 2.1-2.2

 An outdoor sensor can be connected to these terminals. The automatic control 
unit of the boiler will automatically detect this connection when the supply volt-
age is switched on. The reading from this sensor is used for frost protection and 
for weather-dependent control of the fl ow temperature of the boiler when fi tted 
with the optional BME, E6.1111, or KKM 

ST 9.3-9.4

 Interlock circuit (230 Vac from boiler, 1A). If the connection between the two 
terminals is broken, the boiler will go into a fault condition and remain out of 
operation until this connection is restored.

Attention! If the situation lasts for more than 6 minutes, or if it occurs more than 
twice within 6 minutes, the boiler will go into a lockout fault and remain out of 
operation until this connection is restored and is reset using the reset button.

ST 11.1-11.2

 Control for the hot water primary pump (230 Vac from boiler, 1A), of which termi-
nal 11.2 is the phase (L) wire and terminal 11.1 is the neutral (N) wire.

5.3.3 Water connections

It is recommended that the fl ow and return pipes are securely fi xed with brackets. This prevents 
damage and makes maintenance easier.

The boiler is an instantaneous boiler and is 

not suitable for use in open vented systems. 

In such 

cases, a plate heat exchanger should be installed, with which system isolation can be achieved.

The capacity and head of the internal boiler pump is suffi cient to overcome not only the boiler 
resistance but also some system resistance (see table 1).

It is recommended that manually operated valves should be installed between the water connec-
tions and the installation.

In order to limit standby losses further, a motorised valve is sometimes installed in the fl ow or 
return pipe work, or a mechanical non-return valve may be used for this purpose.
Standby losses can be further limited by switching off the boiler via the on/off control circuit.

5.3.4 Flue gas outlet and air inlet

5.3.4.1 Connection 

possibilities

During installation, a choice can still be made between a ‘room sealed’ and an ‘open’ version. The 
standard eccentric connection can also be easily changed into a concentric connection.

The fl ue gas discharge outlet and air intake system should be installed by a recognised installer 
according to applicable national and local standard and specifi cations.

• Type B23:

 Open type appliance without draught stabiliser, air supply from the room, fl ue gas discharge 
outlet above the roof.  

• Type C13:

Room Sealed appliance, connected to a concentric air supply / fl ue discharge through the wall

• Type C33:

Room Sealed appliance, connected to a concentric air supply / fl ue discharge through the roof

• Type C43:

 Room Sealed appliances in cascade, connected to a common concentric air supply / fl ue dis-
charge at the appliance.