2-Stage Control; 4-Stage High/Low Control; Other Inputs; Shutdown Input - DeDietrich 310 ECO Series Installation And Operating Manual

Gas 610 Temperature based 68 – 194
parameter  to . To set the ratio between voltage and the desired flow temperature (see par. 13.2.5
and fig. 21)
0 to 0.9 Volt = boiler off
1 Volt = Flow temperature set point 50
8 Volts = Flow temperature set point 176
Output based – fixed parameters (20 to 100%), set the  value of the boiler control setting parameter 
to  (see fig. 22)
8.6.6 2-Stage control (2 X no volt switched relays)
The heat output on each boiler module stages between the minimum and the maximum value based on
the set flow temperature, terminal connections X29-9 and X29-10. Set the  value of each boiler control
operation parameter  to  (on/off).
8.6.7 4-Stage High/low control (4 x no volt switched relays)
The heat output is controlled between part load (50%, adjustable) and full load by means of a 4-stage
controller, terminal connection X29-9 and X29-10 low fire; X29-7 and X29-8 high fire.
value of each boiler control operation parameter  to . The output percentage on which the

Set the
boiler runs on low fire can be adjusted with parameter  (low fire start point as percentage) in the setting
mode. The 'high fire' percentage is dependent of the maximum adjusted output, see setting mode,

parameter (maximum output). During this 'high' state modulation on adjusted flow temperature is
released.

8.7 Other inputs

8.7.1 Shut down input
As standard each boiler module is supplied with a shut down interlock carrying a 24 Volt AC boiler control
circuit. This input does not require manual re-set.
Any external devices required to stop the boiler (e.g. limit switches of throttling valves, minimum gas
pressure switches) should be wired in series and connected to terminals X29-5 and X29-6, breaking the
circuit will activate the safety interlock and put the boiler into a shut-off condition with code . If
this input is being used, the wire bridge must first be removed.
8.7.2 Lock-out input
As standard each boiler module is supplied with a lock out interlock carrying a 24 Volt AC boiler control
circuit. This input requires manual re-set if activated.
Any external devices required to stop the boiler (e.g. maximum gas pressure switch) must be volt free and
should be wired in series and connected to terminals X29-1 and X29-2. Breaking the circuit will activate
the safety interlock and put the boiler into a lock out condition, failure code  requiring manual
intervention to re-set it. If this input is being used, the wire bridge must first be removed.

8.7.3 External interlock

As standard each boiler module is supplied with an external interlock carrying a 24 Volt AC boiler control
circuit.
Any external devices required to prevent the boiler from operating (e.g. boiler room ventilation air flow
switch, or butterfly valve end switch) must be volt free and should be wired in series and connected to
terminals X29-3 and X29-4, breaking the circuit will prevent the boiler from starting. Boiler does not go to
lock-out. If this interlock is being used, the wire bridge must first be removed.
De Dietrich Gas 310/610 ECO
C] set the  value of the boiler control operation
o o
F [20-90
o o
F [10 C]
o o
F [80 C]
37