Vaillant ecoTEC plus Installation And Maintenance Instructions Manual page 25

Conditions: The product design is compatible with the local gas group
▶
Proceed as described below.
7.15.2 Checking the leak-tightness of the flue gas
system and for flue gas recirculation
1. Check that the flue gas system is intact, in accordance
with British Gas TB 200.
2. If the flue gas system is longer than 2 m, we urgently
recommend that you test the system for flue gas recir-
culation as described below.
3. Use the air analysis point to check for flue gas recircula-
tion.
4. Use the flue gas measuring instrument.
5. If you discover CO or CO2 in the fresh air, search for a
leak in the flue gas system or for the flue gas recircula-
tion.
6. Eliminate the damage.
7. Repeat the above-mentioned test to determine if the
fresh air contains CO or CO2.
8. If you cannot eliminate the damage, you must not start
up the boiler.
7.15.3 Checking the gas flow rate
The boiler is fitted with a multifunctional automatic gas valve
which ensures that the precise air/gas ratio is provided un-
der all operating conditions. 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 fol-
lows:
▶
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.
Nominal
value for
H gas in m³/h
the net heat
supply
in kW in
accordance
+5%
Nom.
with
BS EN 483
12 1,31 1,38
15 1,64 1,72
18 1,97 2,07
24 2,61 2,74
30 3,27 3,43
37 4,03 4,23
25 2,72 2,86
32 3,41 3,58
35 3,78 3,97
38 4,15 4,36
0020209591_01 ecoTEC plus Installation and maintenance instructions
P gas in kg/h
+5%
−10% Nom. −10%
1,18 0.96 1,01 0,86
1,48 1,20 1,26 1.08
1,77 1,44 1,51 1,30
2.35 1,92 2,02 1,73
2,94 2,40 2,52 2,16
3,63 2,96 3,11 2,66
2.45 2,00 2,10 1,80
3,07 2,52 2,65 2,27
3,40 2,78 2,92 2,50
3,73 3,05 3,20 2,75
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.
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 two minutes.
▶
Record the boiler maximum gas flow rate onto the
Benchmark gas boiler commissioning checklist.
7.15.4 Checking the gas flow pressure
1. Ensure that the gas inlet working pressure can be
obtained with all other gas appliances in the property
working.
2. Close the gas isolator cock.
3. Use a screwdriver to undo the measuring nipple screw
(1) (lower screw) 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.
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.
Start-up 7
1
2
25