T From Control Stops Point To Start Point; Maximum Flue Gas Temperature; High Limit Temperature Setting; Modulation Start Point At ∆T - DeDietrich 310 ECO Series Installation And Operating Manual

13.2.8 
from control stops point to start point
T
Parameter , adjustable from 9 to 36°F [5 to 20°C]
This value sets the flow temperature at which the boiler will cut back in after a control stop.
The boiler will always goes to a control stop when the flow temperature equals the flow set-point temperature >
+9°F [> +5°C] The T defines when the burner is switched on again. A value of 18°F [10°C] indicates the
temperature has to drop 9°F [5°C] below the calculated flow temperature set point before the boiler starts to run
again, cut back in temperature = flow set-point (80) + 5 – parameter  (10), i.e. 176 + 9 – 18 = 167°F [80 + 5 –
°
10 = 75 C]
13.2.9 Maximum flue gas temperature ()
Parameter , adjustable between 176 and 248°F [80 and 120°C] This value sets the maximum operating flue
gas temperature – non metallic vent flue systems.
13.2.10 High limit temperature setting ()
Parameter , adjustable between 194 - 230°F [90 - 110°C] This value sets the high limit temperature at which
the boiler will shutdown in a lockout condition requiring manual intervention.
Important!! If the factory setting is reduced, a corresponding reduction in flow set-point will be required
otherwise the min. flow rate may be affected.
13.2.11 Modulation start point at T ()
Parameter , adjustable between 18 and 54°F [10 and 30°C] this value sets the flow/return 
control modulation begins. The boiler starts to modulate at the set-point and will be at minimum output if the 
continues to rise to 72°F [40°C]. At 81°F [45°C] 
installations with low flow rates the starting point modulation can be brought forward (i.e. 27°F [15°C]), closer
matching boiler output to system demand. In systems with small volume flows the modulation start point can be
brought forward. The boiler is better equipped to anticipate low heat demand. The factory set-point should be
correct for most installations. The setting start point should only be changed if absolutely necessary.

13.2.12 Minimum water pressure (


Parameter , adjustable between 0 – 58 psi [0 – 4 bar]. This setting only applies if an optional hydraulic pressure
sensor has been connected. This value sets the point at which the boiler will shut-down if the system pressure
falls below it. The boiler will resume normal operation when pressure is restored.
13.2.13 Adjustments options/accessories/units (
Parameter  is adjustable between 0 and 31. This setting is only applicable if options from table 17 are
connected to the boiler. The control unit detects which options have been connected by means of the value of
this parameter and adjusts the boiler control on this basis.
The required feedback message (as output in % or as temperature is °F or °C) can also be selected here if the
(standard) analog output is used. A list of values that have been assigned to specific options can be found in
Adding together the values of the options used gives the parameter  setting
the boiler will shut-off (shut-off code ). For
T

)

)
56
De Dietrich Gas 310/610 ECO
T
point at which the
T