0020244997_07 Installation and maintenance instructions
37
2
1
3.
Use a screwdriver to undo the test nipple screw
(1)
(lower screw) at the gas valve assembly.
4.
Connect a manometer
(2)
to the test nipple
(1)
.
5.
Open the gas stopcock.
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.
–
Permissible gas flow pressure for operation with
natural gas H: 1.3 to 2.3 kPa (13.0 to 23.0 mbar)
–
Permissible gas flow pressure for operation with
liquefied petroleum gas P: 2.3 to 4.3 kPa (23.0 to
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
undersized.
Condition
: Gas flow pressure not in the permissible range
Caution.
Risk of material damage and operating
faults caused by incorrect gas connection
pressure.
If the gas connection pressure lies outside
the permissible range, this can cause operat-
ing 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 stopcock.
▶
Remove the pressure gauge and retighten the sealing
screw
(1)
for the measuring nipple.
▶
Open the gas stopcock.
▶
Check the test nipple for gas tightness.
▶
Close the gas stopcock.
▶
Install the front casing.
▶
Disconnect the product from the power grid.
▶
You must not start up the boiler.
Condition
: 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.
▶
Remove the pressure gauge and retighten the sealing
screw
(1)
for the measuring nipple.
▶
Open the gas stopcock.
▶
Check the test 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.
9.15.5 Checking and, if required, adjusting the
CO
₂
content and the CO/CO
₂
ratio (air ratio
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 CO
₂
and CO/CO
₂
content at the flue gas
analysis point.
4.
Compare the measured value with the corresponding
value in the table.
Set values
Unit
Natural
gas H
Liquefied
petroleum
gas P
CO
₂
after 5 minutes
in full load mode with
front casing closed
Vol%
9.2
±
1.0
10.4
±
0.5
CO
₂
after 5 minutes
in full load mode with
front casing removed
Vol%
9.0
±
1.0
10.2
±
0.5
Set for Wobbe index
W
₀
kWh/m
³
14.09
21.34
O
₂
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/CO
₂
≤
0.0031
≤
0.0026
