EbV Product documentation THETA NORM/UNIT
8-4
8.1.6 Minimum Burner Run Time (..2.., ..22..)
Function: This function extends the burner run times and reduces the standby losses. After
starting the burner, at least the set time must lapse before the burner is deactivated
again.
Note: If the temperature in the heat generator exceeds the set H-GEN maximum
temperature limit, the minimum burner run time is stopped and the burner is switched
off in advance.
8.1.7 Multi-stage Heat Generators/ Switching Differential (..2.., ..22..)
Function: The controller is provided with two separately settable switching differentials related
to the same setpoint.
Switching Differential I
Switching differential I controls the required heat generator temperature according to
the demand by switching on and off the required stage for the current heat demand
within the set value. The switch-on and switch-off is carried out symmetrically to the
setpoint with half the value of the switching differential.
Switching differential II
(..22..) Switching differential II determines how many stages are necessary to cover the
current demand (partial load - stage I, full load - stage II). This switching differential
is superimposed symmetrically to switching differential I and must always be set at a
higher value.
Note: This setting is overlapped by the cascade setting during cascade mode and is not
available.
Function switching differential II
• If the H-GEN temperature is lower than switching differential II, stage I is switched
on immediately. The enabling of stage II occurs after the time delay stage II.
• If the heat generator temperature reaches the required set point plus half the
value of switching differential I, stage II is switched off.
• If the heat generator temperature is lower than the required set point minus half
the value of switching differential I, stage II is switched on again.
• If the heat generator temperature exceeds the required set point plus half the
value of switching differential I, stage II is switched off.
Cooperation in 2-stage heat generators:
• As long as one stage can cover the heat demand (stage II is off), stage I is
switched according to switching differential I.
• As soon as the second stage is needed for covering the heat demand, switching
differential I switches stage II on and off and switching differential II switches
stage I on and off.
Operation:
Note on operation Key / parameter tree Parameter
Setting minimum burner run time HEAT GENER. PARAMETER 07
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