Operating instructions

141
DHW heating with gas condensing combi boiler
If the flow switch detects that DHW is
being drawn off (> 3 l/min), the burner,
circulation pump and 3-way valve are
started or changed over. The burner
modulates to reach the DHW outlet tem-
perature and is limited on the boiler side
by the temperature limiter.
DHW heating with gas condensing boiler
The burner, the circulation pump and the
3-way valve are started or changed over
if the cylinder temperature lies 2.5 K
below the set cylinder temperature.
In the delivered condition, the set boiler
water temperature is 20 K above the set
DHW temperature (adjustable via coding
address "60" in group "DHW" (weather-
compensated control units) or group 3
(constant temperature control units).
The burner will be switched off and the
circulation pump run-on time will begin,
if the actual cylinder temperature
exceeds the set cylinder temperature by
2.5 K.
Boosting DHW heating
This function is activated by specifying a
second set DHW temperature via coding
address 58 in group "DHW" and activat-
ing the fourth DHW phase for DHW heat-
ing.
Heating is boosted during the periods
selected in this time phase.
Function description
Weather-compensated control unit
(cont.)
5772 909 GB
Service