On/Off Control; High/Low Control - DeDietrich 310 ECO Series Installation And Operating Manual

Gas 310 Temperature based 68 – 194°F [20-90°C]
Set the  value of the boiler control operation 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°F [10°C]
8 Volts = Flow temperature set point 176°F [80°C]
Output based – fixed parameters (20 to 100%)
Set the  value of the boiler control setting parameter  to  (see fig. 22)
0 to 1.9 Volt = Boiler off
2 Volt = Boiler 20% output
10 Volts = Boiler = 100% output
8.6.4 On/off control (1 X no volt switched pair) internal modulation
The heat output modulates between the minimum and the maximum value based on the set flow temperature,
terminal connections X29-9 and X29-10. Set the  value of the boiler control operation parameter  to  (on/off).
8.6.5 High/low control 2 stage (2 x no volt switched pairs)
The heat output is controlled between part load (50%, adjustable) and full load by means of a two-stage
controller, terminal connection X29-9 and X29-10 low fire; X29-7 and X29-8 high fire.
Set the  value of the boiler control operation parameter  to . The output percentage on which the
boiler runs on low fire can be adjusted with parameter  (low fire start point as percentage) in the setting
mode. The 'high fir e' 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.
De Dietrich Gas 310/610 ECO
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