4
Functional description
4.1
Operating modes
The heat interface unit operates using the standard controller func-
tion in automatic mode. Measurements can be viewed, and setpoints
can be entered.
The signals for the heat interface unit are determined manually in
manual mode. The setpoints for the parameter settings are ignored
when manual mode is active. A switchover to automatic mode occurs
after a predefined period of time.
The following components are controlled in manual mode:
n
Valve for domestic hot water
n
Valve for heating supply
n
Heating circulation pump
n
Valve for keep warm function
Legionellae are killed off by thermal disinfection in this operating
mode. The lines are flushed at a water temperature of at least 55
°C
over a preset period. Once this preset period has elapsed, a switch-
over back to automatic mode occurs.
WARNING!
Proliferation of legionellae due to stagnant water!
If the unit is not used for an extended period, there is
a risk of the proliferation of legionellae due to stag-
nant water.
– Upon restarting, set the operating mode to
“Thermal disinfection” (Legio) to flush the
drinking water lines with hot water (
6.3 ‘Setting the operating mode’ on page
26).
Legionellae are bacteria of which one species is
harmful to humans. Legionellae can easily proliferate
in pipes with warm, stagnant water. Flushing the
pipes at a water temperature of at least 55
°C kills off
the legionellae.
All components of the system are activated to test their function for
approx. 1
min. in an automated process in this operating mode. Once
this time has elapsed, a switchover back to automatic mode occurs.
Automatic mode (Auto)
Manual mode (Man)
Thermal disinfection (Legio)
Test procedure (Test)
H3000 E
Functional description
01/2023
Item no. 215251
EA no. EA-1291
Operating instructions
20
