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7 Start-up
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 stopcock.
▶
Remove the pressure gauge and retighten the sealing
screw (2) for the measuring nipple.
▶
Open the gas stopcock (1).
▶
Check the test nipple for gas tightness.
▶
Close the gas stopcock (1).
▶
Install the front casing. (→ Page 9)
▶
Disconnect the product from the electrical installation.
▶
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 stopcock (1).
▶
Remove the pressure gauge and retighten the sealing
screw (2) for the measuring nipple.
▶
Open the gas stopcock (1).
▶
Check the test nipple for gas tightness.
▶
Install the front casing. (→ Page 9)
▶
Reset boiler controls for normal operation.
▶
Record the appliance gas inlet working pressure (kPa
resp. mbar) in the Benchmark gas boiler commissioning
checklist.
18
G20
1.7 ... 2 kPa
(17.0
... 20 mbar)
7.11.2 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.
7.11.3 Thoroughly flushing the heating installation
("hot")
1.
Operate the appliance until the boiler and the heating
system are up to temperature.
2.
Check the heating system for leaks.
3.
Connect a hose to the drain valve located at the lowest
position of the heating system.
4.
Shut off the boiler, open the drain valve and all purge
valves on the radiators and allow the water to flow out
of the heating system and the boiler quickly and fully.
5.
Close the drain valve.
6.
Fill and purge the heating installation. (→ Page 16)
7.
Re-fill the system until the system design pressure of
0,1 MPa (1,0 bar) is attained.
Note
The actual reading on the digital pressure
gauge should ideally be 0,05 MPa (0,5 bar)
plus an additional pressure corresponding
to the highest point of the system above the
base of the boiler – 10 m head equals an ad-
ditional 1 bar reading on the pressure gauge.
The minimum pressure should not be less
than 0,1 MPa (1 bar) in any installation. If
the system is to be treated with an inhibitor it
should be applied at this stage in accordance
with the manufacturer's instructions. Further
information can be obtained from Sentinel,
Betz Dearborn Ltd., Tel: 0151 420 9595, or
Fernox, Alpha– Fry technologies. Tel: 0870
8700362.
8.
Install the front casing. (→ Page 9)
7.11.4 Checking the CO₂ content
1.
Start up the product with check programme (P.01).
2.
Wait until the value that is read is stable.
–
Waiting period for reading a stable value: 5 min
Installation and maintenance instructions ecoFIT sustain 0020277252_00
in the supply air, search for
2
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