Thoroughly Flushing The Heating Installation ("Hot") - Vaillant ecoTEC sustain 24 Installation And Maintenance Instructions Manual

8. With the boiler operating at full load check that the gas
inlet working pressure at the reference test point (2)
complies with the requirements.
Permissible gas flow pressure for operation with
Natural gas H
Permissible gas flow pressure for operation with
Liquefied petroleum gas P
9. Should the pressure recorded at the reference test point
in the boiler be lower than indicated check if there is
any blockage in the pipework or if the pipework is un-
dersized.
Condition: Gas flow pressure not in the permissible range
Caution.
Risk of material damage and operating
faults caused by incorrect gas connec-
tion pressure.
If the gas connection pressure lies outside
the permissible range, this can cause oper-
ating faults in and damage to the product.
▶
Do not make any adjustments to the
product.
▶
Do not start up the product.
▶
If you cannot correct the failure, notify the gas supply
company and proceed as follows:
▶
End the check programme P.01 or P.04.
▶
Allow the boiler to cool down by allowing pump overrun
to operate for a minimum of two minutes.
▶
Close the gas stopcock.
▶
Remove the pressure gauge and retighten the sealing
screw (2) for the measuring nipple.
▶
Open the gas stopcock (1).
▶
Check the test nipple for gas tightness.
▶
Close the gas stopcock (1).
▶
Disconnect the product from the power grid.
▶
You must not start up the boiler.
Condition: Gas flow pressure in the permissible range
▶
End the check programme P.01 or P.04.
▶
Allow the boiler to cool down allowing pump overrun to
operate for a minimum of two minutes.
▶
Close the gas stopcock (1).
▶
Remove the pressure gauge and retighten the sealing
screw (2) for the measuring nipple.
▶
Open the gas stopcock (1).
▶
Check the test nipple for gas tightness.
▶
Reset boiler controls for normal operation.
▶
Record the appliance gas inlet working pressure (kPa
resp. mbar) in the Benchmark gas boiler commissioning
checklist.
0020253094_05 ecoTEC sustain Installation and maintenance instructions
1.3 to 2.3 kPa
(13.0 to 23.0 mbar)
2.3 to 4.3 kPa
(23.0 to 43.0 mbar)
9.9.4 Checking the CO₂ content
1. Start up the product with the check programme and set
the value.
–
Setting value for the programme P.01: 100
Check programmes – Overview (→ Page 45)
2. Wait until the value that is read is stable.
–
Waiting period for reading a stable value: 5 min
1
3. Unscrew the cover from the flue gas analysis point (1).
4. Measure the CO₂ content at the flue gas analysis point.
5. Compare the measured value with the corresponding
value in the table.
Checking the CO₂
content
CO₂ at full load
CO at full load
CO/CO₂
Checking the CO₂
content
CO₂ at full load
CO at full load
CO/CO₂
◁
The value is OK.
▽
The value is not OK; you cannot start up the
product.
▶
Contact customer service.
9.10 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 the heating system again with water as described in
Filling the heating installation and Purging the heating
installation.
7. Re-fill the system until the system design pressure of
0,1 MPa (1,0 bar) is attained.
Removed Fitted front
front casing casing
Natural gas H Natural gas H
9.0 ±1.0 vol. % 9.2 ±1.0 vol. %
≤ 250 ppm ≤ 250 ppm
≤ 0.0031 ≤ 0.0031
Removed Fitted front
front casing casing
Liquefied pet- Liquefied pet-
roleum gas P roleum gas P
10.1 ±0.5 vol. 10.3 ±0.5 vol.
% %
≤ 250 ppm ≤ 250 ppm
≤ 0.0026 ≤ 0.0026
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