Filling And Purging The Heating Installation - Vaillant uniTOWER plus Operating 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 antifreeze and
corrosion inhibitors, biocides or sealants.
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
installation
–
Adey MC1+
–
Fernox F1
–
Fernox F2
–
Sentinel X 100
–
Sentinel X 200
Additives for frost protection intended to remain
permanently in the installation
–
Adey MC ZERO
–
Fernox Antifreeze Alphi 11
–
Sentinel X 500
▶
If you have used the above-mentioned additives, inform
the end user about the measures that are required.
▶
Inform the end user about the measures required for frost
protection.
8.3

Filling and purging the heating installation

1. Flush the heating installation thoroughly prior to filling.
2. Open all of the thermostatic valves on the heating in-
stallation and, if required, all other isolation valves.
3. Check all of the connections and the entire heating
installation for leaks.
4. Switch the prioritising diverter valve to manual oper-
ation (→ Section 8.1) and turn the selection lever to
"Heating circuit/domestic hot water cylinder".
◁
Both valves are open and the filling procedure is
improved since the air in the system can escape.
◁
The heating circuit and the spiral immersion heater
for the domestic hot water cylinder are filled at the
same time.
Note
If you are using a filling device that is set on-
site, this must have WRAS approval.
38
5. Connect a filling hose to the filling/draining valve (1).
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6. Open the purging screw (1) on the automatic air vent
(2) in order to purge the product.
7. Open the filling/draining valve.
8. Open the heating water supply slowly.
9. Purge the highest radiator or underfloor heating circuit
and wait until the circuit is completely purged.
10. Fill with water until the manometer (on-site) shows
that the heating installation has reached a pressure
of approx. 1.5 bar.
11. Close the filling/draining valve.
12. Then check the heating installation pressure again (if
required, repeat the filling procedure).
13. Remove the filling hose from the filling/draining valve
and screw the screw cap back on.
14. Set automatic mode for the prioritising diverter valve
again (→ Section 8.1).
Installation and maintenance instructions 0020291525_04
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