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drinking water (German: KTW)) approval required
for the hose).
After filling, the shut-off device must be activated to
prevent uncontrolled refilling of the heating system.
Function of the AQA therm HES
The BA-installed AQA therm HES, which is installed
immediately after the AQA therm HFB-1717, compri-
ses a water meter, a docking point for an optional
softening cartridge (AQA therm HRC) or desalination
cartridge (SRC), an integrated shut-off ball valve and
a distilled water filling point (warning: non-potable
water!). This is used for softening/desalination and
to register the flushing, filling and refilling volumes.
AQA therm HES works either with the AQA therm
HRC/hardness-reducing cartridge, using the ion
exchange principle (whereby alkaline earth metals
found in the water, like calcium and magnesium, are
replaced with sodium ions), or with the SRC/desali-
nation cartridge (reduces both calcifying and corrosi-
ve substances in the water).
Desalination without additives is preferred. The inte-
grated ‘smart’ electrical water meter enables users to
register the flushing, filling and refilling volumes at all
times.
3. Application
4. Technical data
AQA therm HFB-1717 BA
Medium
Water
Inlet pressure
max. 10.0 bar
Outlet pressure
adjustable from 1.5–4 bar
preset to 1.5 bar
Liquid category back-
flow preventer BA
4 (toxic, extremely toxic, carci-
nogenic, radioactive materials)
AQA therm HES
Medium
Water
Inlet pressure
max. 4 bar
AQA therm HFB-1717 BA
Mounting position
Horizontal with drainage con-
nection directed downwards
Operating temperature
max. 65 °C
Pressure reducer
Ball valve connection
Backflow preventer
G 1/4“
Drainage connection
HT 40
Connection size
½” external thread
AQA therm HES
Mounting
position
horizontal with cartridge directed
downwards, cartridge optional
Operating
temperature
Feed water max. 30 °; device
temperature max. 50 °C with shut-off
ball valve (closed) using the heating
system’s temperature transfer; ambient
temperature max. 40 °C
Connection size
1/2“
Connection size
R
1/2“
Dimensions
H
519.3 mm
h1
58.4 mm
h2
460.9 mm
h3
142.5 mm
L
450.1 mm
l1
140.5 mm
l2
158.1 mm
Kvs value
m
3
/h
max 0.75
6280_EBA AQA therm HFB_HES_HWG_313660-5.indd 16
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