Sequence Of Operation; Boiler Control; Gas 310 Introduction - DeDietrich 310 ECO Series Installation And Operating Manual

8.5 Switch sequence diagram

8.6 Boiler control

8.6.1 Gas 310 Introduction, Gas 610 each module
The De Dietrich Gas 310/610 ECO can be controlled using one of the following methods:
Note: When using on/off control the boiler will also modulate to maintain the flow temp set point (parameter
•
Fully modulating, where the output
modulates between the minimum and
maximum value on the basis of the flow
temperature defined by the modulating
controller.
•
Analog control (0-10 volts), where the
heat output or temperature is controlled
by a 0-10 volt signal.
•
On/off control, (one-volt free relay) where
the heat output modulates between the
minimum and maximum value on the
basis of the flow temperature set in the
boiler.
High/low control, (two volt free relays) where the
boiler is controlled by means of a 2-stage
controller at part load and full load.
In all cases, modulation is based on the required flow temperature and there is a
the following characteristic. Up to a

output. Between
T full load

of 45°F [25°C] (factory setting, parameter
T

and the output reduces in linear fashion (see fig. 20).
T part load
De Dietrich Gas 310/610 ECO
34
Fig. 19 Switch sequence diagram [04.31H.79.00003]
Fig. 20 °output control characteristic

dependent output control with
T

) the boiler operates at full

)