7 Start-up
20 Installation and maintenance instructions SUSTAIN ..c 0020200954_00
7.12 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 (1) to check for flue gas recir-
culation.
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.
7.13 Checking the gas connection pressure (gas
flow pressure)
1. Close the gas isolator cock.
2. Use a screwdriver to undo the sealing screw on the
measuring connection (1) of the gas valve.
3. Connect a pressure gauge (2) to the measuring nipple
(1).
4. Open the gas isolator cock.
5. Start up the product with the check programme P.01.
6. Measure the gas connection pressure against atmo-
spheric pressure.
Permissible connection pressure
Great Bri-
tain
Natural gas G20
1.7
… 2.5 kPa
(17.0
… 25.0 mbar)
7. Decommission the product.
8. Close the gas isolator cock.
9. Remove the pressure gauge.
10. Tighten the screw on the measuring nipple (1).
11. Open the gas isolator cock.
12. Check the measuring nipple for gas tightness.
Conditions: Gas connection 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 are unable to remedy the fault, contact the gas
supply company.
▶ Close the gas isolator cock.
7.14 Checking the CO₂ content
1. Start up the product with the check programme P.01.
2. Wait at least five minutes until the product reaches its
operating temperature.
3. Measure the CO₂ content at the flue gas analysis point.
4. Compare the measured value with the corresponding
value in the table.
Settings Unit G20 natural
gas
CO₂ after 5 minutes in full
load mode with front casing
closed
Vol.–% 9.2 ± 1.0
CO₂ after 5 minutes in full
load mode with front casing
removed
Vol.–% 9.0 ± 1.0
Set for Wobbe index W₀ kWh/m³ 15
CO in full load mode ppm ≤ 250
CO/CO₂
≤ 0.0031
5. Set the CO₂ content as required. (→ Page 20)
7.15 Setting the CO₂ content
1. Remove the yellow sticker.
2. Remove the blue covering cap (1).
3. Use an Allen key to turn the bolt in order to set the CO₂
content (value with front casing removed).
◁ Turning to the right decreases the value.
◁ Turning to the left increases the value.
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