Preventing Low Water Pressure; Filling The Condensate Siphon; Filling And Purging The Heating Installation - Vaillant ecoTEC sustain 24 Installation And Maintenance Instructions Manual

Caution.
Risk of material damage if the heating
water is treated with unsuitable additives.
Unsuitable additives may cause changes in
the components, noises in heating mode and
possibly subsequent damage.
▶
Do not use any unsuitable frost and cor-
rosion protection agents, biocides or seal-
ants.
No incompatibility with our products has been detected to
date with proper use of the following additives.
▶
When using additives, follow the manufacturer's instruc-
tions without exception.
We accept no liability for the compatibility of any additive or
its effectiveness in the rest of the heating system.
Additives for cleaning measures (subsequent
flushing required)
–
Adey MC3+
–
Adey MC5
–
Fernox F3
–
Sentinel X 300
–
Sentinel X 400
Additives intended to remain permanently in the
system
–
Adey MC1+
–
Fernox F1
–
Fernox F2
–
Sentinel X 100
–
Sentinel X 200
Additives for frost protection intended to remain
permanently in the system
–
Adey MC ZERO
–
Fernox Antifreeze Alphi 11
–
Sentinel X 500
▶
If you have used the above-mentioned additives, inform
the operator about the measures that are required.
▶
Inform the operator about the measures required for frost
protection.
7.5

Preventing low water pressure

The required filling pressure is between 0.08 and 0.2 MPa
(0.8 and 2 bar).
If the water pressure falls below 0.05 MPa (0.5 bar), the
value flashes in the display.
If the water pressure falls below 0.03 MPa (0.3 bar), the
product switches off. The display shows 0.0 bar (0.0 MPa).
Fault F22 is stored in the fault list.
▶
Top up the water in the heating installation to start up the
product again.
◁
The pressure value flashes in the display until a
pressure of 0.05 MPa (0.5 bar) or higher has been
reached.
0020253094_01 ecoTEC sustain Installation and maintenance instructions
7.6

Filling the condensate siphon

C
1. Unclip the lower section of the siphon (1) from the up-
per section of the siphon (2) without removing the pro-
duct's front casing.
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 discharge
pipe.
4. Reinsert the float (3).
Note
Check that the float is present in the con-
densate siphon.
5. Clip the lower section of the siphon (1) into the upper
section of the siphon (2).
7.7

Filling and purging the heating installation

Preliminary work
1. Flush the heating installation through.
2. Observe the information on the topic of treating
(→ Page 18) heating water.
1
1. Loosen the cap on the automatic air vent (1) by one or
two rotations.
2. Open all thermostatic radiator valves.
3. Supply the heating circuit with water.
4. Check whether the stop cocks for the heating flow and
return are open.
5. Start filling programme P.06.
Start-up 7
2
A B
3
1
19