7 Start-up
26 Installation and maintenance instructions ecoTEC plus 0020209591_01
– 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)
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.
Conditions: 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.
▶ Allow the boiler to cool down by allowing pump overrun
to operate for a minimum of two minutes.
▶ Close the gas isolator cock.
▶ Remove the pressure gauge and retighten the sealing
screw (1) for the measuring nipple.
▶ Open the gas isolator cock.
▶ Check the measuring nipple for gas tightness.
▶ Close the gas isolator cock.
▶ Install the front casing.
▶ Disconnect the product from the power mains.
▶ You must not start up the boiler.
Conditions: Gas flow pressure in the permissible range
▶ End the check programme P.01.
▶ Allow the boiler to cool down allowing pump overrun to
operate for a minimum of two minutes.
▶ Close the gas isolator cock.
▶ Remove the pressure gauge and retighten the sealing
screw (1) for the measuring nipple.
▶ Open the gas isolator cock.
▶ Check the measuring nipple for gas tightness.
▶ Install the front casing.
▶ Reset boiler controls for normal operation.
▶ Record the appliance gas inlet working pressure (kPa
resp. mbar) in the Benchmark gas boiler commissioning
checklist.
7.15.5 Checking the CO₂ content and, if
necessary, adjusting it (air index setting)
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 and CO/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
G31 liquid
gas
CO₂ after 5 minutes
in full load mode with
front casing closed
Vol.–% 9.2 ± 1.0 10.4 ± 0.5
CO₂ after 5 minutes
in full load mode with
front casing removed
Vol.–% 9.0 ± 1.0 10.2 ± 0.5
Set for Wobbe index
W₀
kWh/m³ 14.09 21.34
O₂ after 5 minutes in
full load mode with
front casing closed
Vol.–% 4.5 ± 1.8 5.1 ± 0.8
CO value with full load
ppm ≤ 250 ≤ 250
CO/CO₂
≤ 0.0031 ≤ 0.0026
Conditions: The CO₂ content must be adjusted
2
1
▶ Pierce the covering cap (1) at the mark using a small
flat-blade screwdriver and unscrew it.
▶ After performing the adjustments, tilt the air intake pipe
back up.
▶ Check the CO₂ content again.
▶ If necessary, repeat the setting process.
▶ Set the CO₂ content (value with front casing removed)
by turning the screw (2).
– Higher CO₂ content: Turn anti-clockwise
– Lower CO₂ content: Turn clockwise
▶ For natural gas only: Only perform the adjustment in in-
crements of 1 turn and wait approx. 1 minute after each
adjustment until the value stabilises.
▶ For liquid gas only: Only perform the adjustment in small
increments (approx. 1/2 turn), and wait approx. 1 minute
after each adjustment until the value stabilises.
▶ Check the CO₂ content again.
▶ If necessary, repeat the setting process.
▶
Press (Cancel) once the adjustments have been
made.
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