Gas Inspection - Vaillant ecoTEC exclusive 843 Installation And Maintenance Instructions Manual

5. Install the lower section of the condensate trap by pla-
cing the lower section in position and turning it clock-
wise until it clicks into place.
7.14

Gas inspection

7.14.1 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.
7.14.2 Checking the gas flow rate
The gas flow rate has been set during production and does
not require adjustment. With the front casing fitted check the
gas flow rate of the boiler as follows:
▶
Start up the product with the check programme P.01.
▶
In addition, ensure that maximum heat can be dissipated
into the heating system by turning up the room thermo-
stat.
▶
Wait at least 5 minutes until the boiler has reached its
operating temperature.
▶
Ensure that all other gas appliances in the property are
turned off.
▶
Measure the gas flow rate at the gas meter.
▶
Compare the measured values with the corresponding
values in the table.
Qnw from the data
plate
15.3
18.4
24.7
25.7
28.6
30.6
35.7
Conditions: Gas flow rate not in the permissible range
▶
Check all of the piping and ensure that the gas flow rates
are correct.
▶
Only put the product into operation once the gas flow
rates have been corrected.
0020193968_03 ecoTEC exclusive Installation and maintenance instructions
in the supply air, search for
2
H gas in m³/h
−10%
Nom. +5%
1.62 1.70 1.46
1.95 2.05 1.76
2.61 2.74 2.35
2.72 2.86 2.45
3.03 3.18 2.73
3.24 3.40 2.92
3.78 3.97 3.40
Conditions: Gas flow rate in the permissible range
▶
End the check programme P.01.
▶
Allow the boiler to cool down by allowing pump overrun to
operate for a minimum of 2 minutes.
▶
Record the boiler maximum gas flow rate onto the
Benchmark gas boiler commissioning checklist.
7.14.3 Checking the gas flow pressure
1. Close the gas isolator cock.
2. Remove the front casing. (→ Page 10)
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3. Use a screwdriver to undo the sealing screw of the
measuring nipple (1) at the gas valve.
4. Connect a pressure gauge (2) to the measuring nipple
(1).
5. Open the gas isolator cock.
6. Start up the product with the check programme P.01.
◁
S.93 is briefly displayed.
◁
If the display switches to S.04, the product is ready
for the measurement.
7. In addition, ensure that maximum heat can be dissip-
ated into the heating system by turning up the room
thermostat.
8. With the boiler operating at full load check that the gas
inlet working pressure at the reference test point com-
plies with the requirements.
9. Measure the gas flow pressure in comparison with the
atmospheric pressure.
–
Permissible gas flow pressure for operation
with G20 natural gas: 1.3 ... 2.3 kPa (13.0
... 23.0 mbar)
–
Permissible gas flow pressure for operation
with G31 liquid gas: 2.3 ... 4.3 kPa (23.0
... 43.0 mbar)
10. 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.
11. Decommission the product.
12. Close the gas isolator cock.
13. Remove the pressure gauge.
Start-up 7
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