98
DC N12 Differential control in normal operation between sensors S1 and S2.
(ex works = --)
Setting range: DC N12 to DC N65, DC I12 to DC I65)
DC -- = differential control is disabled.
DVD 10 The desired value for differential control is 10K. In the example, the temperature
difference between S1 and S2 is maintained at 10K.
Warning: DVD always has to be greater than the switch-off difference of the
basic function. If the DVD is lower, the basic function of pump release blocks
before the speed control has reached the desired value. (ex works = 10K)
Setting range: 0.0 to 9.9K in increments of 0.1K,
10 to 99K in increments of 1K
If the absolute value control (maintaining a sensor) and the differential control (maintaining
the difference between two sensors) are both active, the slower of the two speeds “wins out”.
Event control = If a set temperature event occurs, the speed control starts, thus keeping
a sensor constant.
If, for instance, S3 reaches 60°C (activation threshold), the collector should be kept at a
certain temperature. Maintaining a sensor then works as with absolute value control.
Example:
EC N31 Event control in normal operation, an event at sensor S3 leads to a constant
level at sensor S
1. (ex works = --)
Setting range: EC N12 to EC N65, EC I12 to EC I65)
EC -- = event control is disabled.
TVE 60 The threshold value for event control is 60°C. At a temperature of 60°C at S3,
the speed control is activated. (ex works = 60°C)
Setting range: 0 to 99°C in increments of 1°C
DVE 10 The desired value for event control is 10°C. As soon as the event has
occurred, S1 is kept at 10°C. (ex works = 130°C)
Setting range: 0 to 199°C in increments of 1°C
The event control “overwrites” the speed results from other control methods. A set event
can thus block the control of absolute values or differences.
In the
example, keeping the collector temperature at 50°C with the absolute value control
is blocked when the cylinder has already reached 60°C at the top = the fast provision of hot
water is complete and is now to be continued with full volume flow (and hence a lower
temperature but slightly better efficiency). To do so, a value that value automatically requires
full speed (such as S1 = 10°C) has to be entered as the new desired temperature in the
event control.
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