Flushing The System; Initial System Filling; System Refilling; Replacing Depleted Cartridges - BWT AQA therm HFB-1717 BA Installation And Operating Instructions Manual

8.3 Flushing the system

Some national standards stipulate flushing the hea-
ting system, so a dummy plug (Art.-no. 08454) is
necessary. This can be installed instead of the AQA
therm hardness-reducing cartridge (HRC) or desali-
nation cartridge (SRC). After flushing, reconnect the
cartridge to fill the system.

8.4 Initial system filling

1. Remove the air from the cartridge and rinse it.
Place a bucket underneath and open the bleed
valve.
2. Open the water supply (shut-off valve) on the inlet
side and, with the AQA therm HRC-S, rinse c. 5
litres/HRC/SRC-L c. 15 litres /SRC-XL c. 20 litres
of water in the bucket.
3. Close the vent valve, check the cartridge is wa-
tertight.
4. Open the shut-off on the AQA therm HES, and
fill/refill the heating system in accordance with
the standard.
5. Slowly open the shut-off ball valve on the inlet
and outlet side of the AQA therm HFB-1717 BA
and the outlet side of the AQA therm HES.
6. After filling the system, close all the shut-off ball
valves. Occasional fluctuations in pressure may
cause water to leak from the drain funnel! This is
not a malfunction, and therefore no grounds for
complaint!

8.5 System refilling

Proceed in accordance with 8.3 & 8.4. Note the
maximum capacity of the AQA therm HRC or AQA
therm SRC and replace it when it reaches capacity.

8.6 Replacing depleted cartridges

a) If, according to the 'smart' set-up cartridge, capa-
city falls below 10%, the service LED will flash
yellow. If, according to the 'smart' set-up, cart-
ridge capacity falls below 10%, the service LED
will start flashing yellow. When the cartridge is
totally depleted or if the cartridge has been in
use for longer than 5 years, the service display
will flash red and emit a beep. (Factory setting is
tone on; to turn off, see 8.3 point h).
b. Depressurise the cartridge using the vent valve.
c. Unscrew the cartridge from left to right (clockwi-
se) from the AQA therm HES.
d. Dispose of used cartridges in domestic waste/
plastic recycling.

8.7 Installing new cartridges

a) Remove the cartridge from its packaging and
check for any damage or defects.
b) Remove the hygiene cap from the cartridge.
6280_EBA AQA therm HFB_HES_HWG_313660-5.indd 19
c) Screw the cartridge into the AQA therm from
right to left (anti-clockwise).
d) If the new cartridge is screwed into the AQA
therm HES, it must be logged via the 'smart'
function. Press the Kartusche/cartridge button to
toggle between the different cartridges, pause
on the selected cartridge for 3 seconds to log
it. When replacing a depleted cartridge with a
new one, please press the water Wasserhärte/
hardness and Kartusche/cartridge buttons for 3
seconds to reset the cartridge capacity.
Warning: If the new cartridge is different to the
old one, e.g. size (L/XL), the new cartridge must
be selected and logged using the Kartusche/
cartridge button.

9. Servicing

Backflow preventers must only be serviced by autho-
rised, qualified personnel!

9.1 Inspection

Frequency: every 6 months (depending on local con-
ditions), carried out by an installation company or
BWT's service team.
9.1.1 Operating the control pressure reducer
1. Close the shut-off ball valve on the outlet side on
the AQA therm HFB-1717 BA.
2. Monitor the outlet pressure on the pressure gauge
at zero flow
- If the pressure increases slowly, the valve may
be dirty or faulty. If this is the case, carry out
maintenance and cleaning.
3. Slowly open the shut-off ball valve on the outlet
side on the AQA therm HFB-1717 BA.

9.2 Maintenance

We recommend that you take out a maintenance
contract with an installation company or with BWT's
service team.
Regular maintenance must be carried out in ac-
cordance with DIN EN 1717.
Frequency: 1-3 years (depending on local condi-
tions), carried out by an installation company or
BWT's service team.
9.2.1 Valve core and filter
1. Close the shut-off ball valve on the inlet side of
der AQA therm HFB-1717 BA and on the outlet
side of the AQA therm HES.
EN
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24.09.15 09:09