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Extended service
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Service parameter(s) 37-41
37 Time constant for return temperature limitation
Circuit Setting range Factory setting
(I) / (II) OFF / 1 ... 50 (25) / (25)
Controls how fast the actual return temperature adapts to the
desired return temperature limitation.
Adjust the time constant for the return limitation.
The setting will eliminate the difference
between the acceptable and the actual return
temperature.
The difference is integrated to adjust the desired
flow temperature.
OFF: The desired flow temperature will not be
adjusted any further.
1: The desired flow temperature will be
adjusted quickly.
50: The desired flow temperature will be
adjusted slowly.
40 DHW pump post-run (P2)
Circuit Setting range Factory setting
II 0 ... 9 min. 0 min.
The DHW pump can continue to run after charging to utilize the
remaining heat in the heat exchanger / boiler.
0: The pump stops immediately after
charging.
1 ... 9: The time the pump runs after the charging
has ended.
The P2 pump is the charging pump in applications 2 and 2a.
41 DHW charging pump post-run (P4)
Circuit Setting range Factory setting
II 0 ... 9 min. 1 min.
Set the post-run time of the DHW charging pump in the
secondary circuit. The setting only applies to heating system
types 4, 5, 6 and 6a in section 10.
0: The pump stops immediately after
charging.
1 ... 9: The time the pump runs after the charging
has ended.
When the DHW charging pump runs after the charging of
the DHW tank has stopped, the heat in the exchanger can be
utilized to a better extent.
The post-run of the DHW charging pump (line 41) should not be
set to a shorter time than that of the DHW pump (line 40).
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