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Boiler functions
responding flow rate to the plant until the valve is completely opened and the boiler pump deliv-
ers the maximum flow rate in the plant.
Parameter
Minimum return flow temperature
Depending on the configuration, the return flow boost can be controlled with a continuous
signal, on/off signal or three-point stepping signal (–> section 8.11).
5.4.1 Common return flow boost
In systems with two boilers (systems Anl 4, 5, 6 and 7), a common return flow boost can be im-
plemented. This is done by using the return flow control circuit of the first boiler K1, depending
on whether the boiler is in operation.
Function
Common return flow boost
Parallel operation (Anl 7)
5.5
This function leads to both boilers working constantly in parallel (no lag/lead sequence
control).
The boilers start operating one after the other, taking into account the programmed times: Mini-
mum deactivation time for boiler K1, 2 and Lag delay as well as taking into account Tempera-
ture t
for releasing sequence
A
Function
Parallel operation of boilers
Parameters
Minimum deactivation time f. boiler K1, 2
Lag delay
Temperature t
for releasing sequence
A
5.6
Operating hours counter
This function allows the performed operating hours of boilers K1, 2 to be shown in the Inf1, 2
levels. The control is not affected by the counted operating hours. If the operating hours should
be selected to start at a certain initial value, this can be programmed separately.
38
EB 5474 EN
WE
Parameter level / Range of values
50 °C
PA1, PA2* / 20 to 120 °C
* Only in systems Anl 4 to 7
WE
Configuration
OFF
Co5 -> Fb12 = ON
WE
Configuration
OFF
Co5 -> Fb19 = ON
WE
Parameter level / Range of values
0 min
PA1, 2 / 0 to 90 min
10 min PA5 / 0 to 90 min
12 °C
PA5 / –40 to 50 °C
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