Checking Leak-Tightness - Vaillant ecoFIT pure 825 Installation And Maintenance Instructions Manual

7.11.2 Checking the leak-tightness of the flue gas
installation and flue gas recirculation
1. Check the flue gas installation is intact in accordance
with the latest gas safe technical bulletin and informa-
tion supplied in the installation instructions.
2. For extended flue gas installations check for flue gas
recirculation using the air analysis point.
3. Use a flue gas analyser.
4. If you discover CO or CO
the leak in the flue gas installation or for signs of flue
gas recirculation.
5. Eliminate the damage properly.
6. Check again whether the supply air contains any CO or
CO .
2
7. If you cannot eliminate the damage, do not start up the
product.
7.11.3 Thoroughly flushing the heating installation
("hot")
1. Operate the appliance until the boiler and the heating
system are up to temperature.
2. Check the heating system for leaks.
3. Connect a hose to the drain valve located at the lowest
position of the heating system.
4. Shut off the boiler, open the drain valve and all purge
valves on the radiators and allow the water to flow out
of the heating system and the boiler quickly and fully.
5. Close the drain valve.
6. Fill and purge the heating installation. (→ Page 17)
7. Re-fill the system until the system design pressure of
0,1 MPa (1,0 bar) is attained.
Note
The actual reading on the digital pressure
gauge should ideally be 0,05 MPa (0,5 bar)
plus an additional pressure corresponding
to the highest point of the system above the
base of the boiler – 10 m head equals an ad-
ditional 1 bar reading on the pressure gauge.
The minimum pressure should not be less
than 0,1 MPa (1 bar) in any installation. If
the system is to be treated with an inhibitor it
should be applied at this stage in accordance
with the manufacturer's instructions. Further
information can be obtained from Sentinel,
Betz Dearborn Ltd., Tel: 0151 420 9595, or
Fernox, Alpha– Fry technologies. Tel: 0870
8700362.
8. Install the front casing. (→ Page 10)
7.11.4 Checking the CO₂ content
1. Start up the product with check programme (P.01).
2. Wait until the value that is read is stable.
–
Waiting period for reading a stable value: 5 min
0020230531_01 ecoFIT pure Installation and maintenance instructions
in the supply air, search for
2
1
3. Unscrew the cover from the flue gas analysis point (1).
4. Measure the CO₂ content at the flue gas analysis point
(1).
5. Compare the measured value with the corresponding
value in the table.
Checking the CO₂ content
Great Bri-
tain
Removed
front cas-
ing/installed
front casing
Natural gas
G20
9.2 ±1 %
◁
The value is OK.
▽
The value is not OK; you cannot start up the
product.
▶
Inform Customer Service.
7.12

Checking leak-tightness

▶
Check the gas pipe, the heating circuit and the hot water
circuit for leak-tightness.
▶
Check that the air/flue pipe has been installed correctly.
Conditions: Room-sealed operation
▶
Check whether the vacuum chamber has been sealed so
that it is leak-tight.
7.12.1 Checking the heating mode
1. Activate the heating mode on the user interface.
2. Turn all thermostatic radiator valves on the radiators
until they are fully open.
3. Allow the product to operate for at least 15 minutes.
4. Fill and purge the heating installation. (→ Page 17)
5. Call up the status codes. (→ Page 15)
Status codes – Overview (→ Page 32)
◁
If the product is working correctly, the display shows
S.04.
7.12.2 Checking the hot water generation
1. Activate the hot water handling mode on the user
interface.
2. Open a hot water valve completely.
3. Call up the status codes. (→ Page 15)
Start-up 7
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