If the supply temperature is approaching freezing point, the control is
activated. The circulation pump starts and the valve makes adjust-
ments to set a minimum setpoint. When the supply temperature rea-
ches 8
°C, the control continues operating for a number of minutes
before switching off again. This prevents water from freezing in the
pipes.
If the pump does not operate for several days, then the pump is
briefly moved without opening the valve. This prevents the pump from
locking up mechanically.
4.4
Special functions
There is the option of equipping the controller circuit board with
remote off. Remote off also overrides manual mode and frost protec-
tion. The shutoff function is inactive, which is why the contact on the
corresponding terminals is open.
A valve in the primary supply keeps the supply line to the unit warm
for fast hot water preparation. The keep warm function keeps the
supply line at a temperature between the parameter settings for ON
level KWF and Off level KWF.
4.5
Password protection
Only basic values are available in the HMI if no log-in as service per-
sonnel has occurred by entering the corresponding PIN. The log-in
procedure and the description of potential additional settings and
functions are listed in a separate appendix for the service personnel.
4.6
Data recording
The controller can continually record measured data
and parameters (e.g. domestic hot water flow rate).
This function can be deactivated by the service per-
sonnel by using the instructions in the corre-
sponding appendix.
Frost protection
Anti-lock protection
Remote off
Keep warm function
H3000 E
Functional description
01/2023
Item no. 215251
EA no. EA-1291
Operating instructions
22
