Checking And Adjusting The Gas Settings - Vaillant ecoFIT pure 825 Installation And Maintenance Instructions Manual

7 Start-up
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.
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.
7.11

Checking and adjusting the gas settings

Only a qualified competent person is authorised to imple-
ment the settings on the gas valve.
Each destroyed tamper-proof seal must be replaced.
The CO2 adjusting screw must be sealed.
Never modify the factory setting of the gas pressure regu-
lator of the gas valve.
7.11.1 Checking the gas connection pressure (gas
flow pressure)
2
1
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 (1).
3. Undo the sealing screw on the measuring nipple (2).
4. Connect a pressure gauge to the measuring nipple (2).
5. Open the gas isolator cock (1).
6. Start up the product with check programme P.01
(system with eBUS controller) or P.03 (system without
eBUS controller).
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 (2)
complies with the requirements.
18
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
Permissible connection pressure
Great Bri- Natural
tain gas
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 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 (2) for the measuring nipple.
▶
Open the gas isolator cock (1).
▶
Check the measuring nipple for gas tightness.
▶
Close the gas isolator cock (1).
▶
Install the front casing. (→ Page 10)
▶
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 (1).
▶
Remove the pressure gauge and retighten the sealing
screw (2) for the measuring nipple.
▶
Open the gas isolator cock (1).
▶
Check the measuring nipple for gas tightness.
▶
Install the front casing. (→ Page 10)
▶
Reset boiler controls for normal operation.
▶
Record the appliance gas inlet working pressure (kPa
resp. mbar) in the Benchmark gas boiler commissioning
checklist.
Installation and maintenance instructions ecoFIT pure 0020230531_01
G20
1.7 ... 2 kPa
(17.0
... 20 mbar)