7 Start-up
18 Installation and maintenance instructions SUSTAIN ..s 0020200967_00
7.7 Filling and purging the heating installation
Preliminary work
▶ Rinse the heating installation through.
1. Loosen the purging valve cap (1) on the pump and on
the automatic air vents.
2. Fill with water until the required filling pressure is
reached.
– Recommended filling pressure: 1 … 1.5 bar
◁ The heating and hot water functions cannot be activ-
ated.
◁ The pressure value flashes in the display until a
pressure of 0.05 MPa (0.5 bar) or higher has been
reached.
◁ Automatic purging is triggered as soon as the
pressure increases above 0.07 MPa (0.7 bar) over
longer than 15 seconds.
3. Purge each radiator until the water escapes normally,
and then retighten the system's purging valves.
Note
Leave the pump purging valve cap loosened.
4. Check whether all connections are leak-tight.
Conditions: If the noise persists in the boiler
▶ Purge the product again by activating check programme
(P.07) and then (P.06).
Check programmes – Overview (→ Page 28)
7.8 Filling the condensate siphon
1. Unclip the lower section of the siphon (1) from the up-
per section of the siphon (2).
2. Remove the float (3).
3. Fill the lower section of the siphon with water up to 10
mm below the upper edge of the condensate drain pipe-
work.
4. Re-insert the float (3).
Note
Check whether the float is present in the
condensate siphon.
5. Clip the lower section of the siphon (1) into the upper
section of the siphon (2).
7.9 Checking and adjusting the gas settings
Only a qualified competent person is authorised to imple-
ment the settings on the gas valve.
Each destroyed seal must be restored.
The CO2 adjusting screw must be sealed.
Never modify the factory setting of the gas pressure regu-
lator of the gas valve.
7.9.1 Checking the gas connection pressure (gas
flow pressure)
1. Close the gas isolator cock.
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