oventrop Regtronic RQ Installation And Operating Instructions For The Specialised Installer page 19

Maximum limitation for exceedance of the hot water set temperature (T -HW set)
Main menu / Hot water / ∆Tmax
Adjustment channel Description
Max. limitation Maximum limitation option
tmax Switch-on condition time period
Maximum exceedance of the hot
∆Tmax
water set temperature T-HW set
Adjustment range / selection Factory setting
Yes, No Yes
5 ... 300 s 180 s
5.0 K
3.0 ... 8.0 K
This function can be used for preventing draw-off
water temperatures that massively exceed the hot
water set temperature ( scald protection).
Note:
The switch-on condition for the maximum
limitation will only become valid if the hot
water fl ow temperature is >= 60°C.
When the temperature measured at the HW fl ow
sensor S2 exceeds the hot water set temperature
T-HW set by the maximum temperature difference
∆Tmax, the primary pump R4 is switched off.
Example:
T-HW > T-HW set + ∆Tmax Î primary pump off
When the maximum limitation is active, no DHW
heating takes place. In the Status / Messages menu, the
error message Emergency shutdown appears. In or-
der to enable DHW heating again, acknowledge the
error message by pressing button (5).
Note:
The maximum limitation will not become
active during and up until 1 hour after the
completion of a thermal disinfection.
Note:
The maximum limitation does not affect the
control of the circulation pump.
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