16 Description of function
2021/03 99E13331xx-mub-en - V07 37
16.4 Comfort function
The comfort function controls the operation of the primary pump when there is no withdrawal
and circulation.
To speed up the start-up process of the module, the flow to the heat exchanger can be warmed
up and be maintained on a certain temperature. To do that, the primary pump is actuated
depending on the flow temperature. After starting the pump, the comfort function is locked for
the duration of a defined break.
An additional limitation to specific time windows is possible by using a weekly timer (detailed
information on the time control settings in chapter
Circulation
-
Time control
).
The nominal temperature for the comfort function cannot be set freely, but is calculated
dynamically:
Comfort nominal temperature = hot water nominal temperature – ΔT
The sensor which measures the comfort nominal temperature is the flow sensor (T-VL / S1).
To avoid a permanent operation of the primary pump due to a storage tank that is not hot
enough, a security query is carried out. If, within 100 seconds after the start of the comfort
function, the flow temperature has not reached the calculated comfort nominal temperature, the
comfort function is blocked for one hour.
If there is an increased risk of limescale for the heat exchanger, it is recommended to use the
comfort function only in a restricted way.
Comfort function Activates the function On, Off Off
Comfort function pause time Pause 1 ... 60 min 10 min
Comfort function ΔT Temperature
difference
1 ... 15 K 5 K
Pumping rotation speed Controls the primary
pump
0 ... 100 % 25 %
Time control
Continuous operation Primary pump runs
permanently
On, Off Off
Time control settings Sets the time windows Monday...Friday
00:00 ... 23:59
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