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14. Remove the pressure gauge and re-tighten the sealing
screw (1).
15. Turn on gas at the gas isolation valve.
16. Make sure that there is no leakage at the sealing
screw.
17. Turn off gas at the gas isolation valve.
18. Make sure that there is no leakage at the sealing
screw.
19. Put the front casing back on.
20. Turn off electrical supply to the boiler.
21. You must not start up the boiler.
22. If the gas inlet working pressure is within the permiss-
ible range, proceed as follows:
23. Take the boiler out of operation by pressing the + and
i buttons simultaneously and turning down both of the
thermostat control knobs.
24. Close gas isolation valve of the boiler.
25. Remove the pressure gauge and re-tighten the sealing
screw (1).
26. Open the gas isolation valve of the boiler.
27. Make sure that there is no leakage at the sealing bolt
screw.
28. Put the front casing back on.
29. Reset boiler controls for normal operation.
30. Record the appliance gas inlet working pressure (mbar)
in the Benchmark gas boiler commissioning checklist.
7.10.4 Checking the gas flow rate
Note
The boiler is fitted with a multifunctional automatic
gas valve which ensures that the precise air/gas
ratio is provided under all operating conditions.
The gas flow rate has been set during production
and does not require adjustment.
1.
Start the boiler by activating the test program P.1
(→ Page 15).
–
In addition, ensure that maximum heat can be dis-
sipated into the heating system by.
2.
Wait at least 5 minutes until the boiler has reached its
operating temperature.
3.
Ensure that all other gas appliances in the property are
turned off.
4.
Measure the gas flow rate at the gas meter..
5.
Check that the gas flow rate is as stated:
Boiler
Nominal net
heat input in
kW
VKK GB
80
806/3-E R1
VKK GB
115.9
1206/3-E
R1
VKK GB
160
1606/3-E
R1
VKK GB
200
2006/3-E
R1
0020149561_01 ecoCRAFT exclusive Installation and maintenance instructions
Gas Rate
Natural Gas in m³/h
− 10 %
nominal
+ 5 %
8.46
8.88
7.61
12.25
12.86
11.03
16.91
17.76
15.22
21.14
22.2
19.03
Boiler
Nominal net
heat input in
kW
VKK GB
240
2406/3-E
R1
VKK GB
280
2806/3-E
R1
6.
If the measured gas flow rate lies outside the tolerance
limits specified, do not operate the boiler and inform the
Vaillant Service Solutions (0870 6060 777).
7.
If the measured gas flow rate is within the tolerance
limits, then proceed as follows:
8.
Take the boiler out of operation by pressing the + and i
buttons simultaneously and turn down both thermostat
control knobs.
9.
Record the boiler maximum gas flow rate onto the boiler
commissioning checklist.
7.11
Checking that the product functions
correctly and checking the leak-tightness
1.
Start up the product.
2.
In particular, check the burner seal for leaks using a
CO₂ measuring instrument. If required, tighten the
burner seal to a torque of 12 Nm.
3.
Check that all control, regulation and monitoring
devices are functioning properly.
4.
Check that the condensate discharge pipe has been
installed correctly and is securely fastened.
5.
Check the over-ignition and that the flame on the burner
is burning evenly (diagnostics code d.44: < 250 = excel-
lent flame, > 700 no flame).
6.
Ensure that all casing sections are installed correctly.
7.11.1 Checking the heating mode
▶
Ensure that there is a heat requirement, e.g. by setting
the control to a higher required temperature.
◁
If the product is working correctly, the heat generator
pump for the heating circuit must start running.
7.11.2 Checking the hot water generation
Conditions: Domestic hot water cylinder connected
▶
Check that the domestic hot water generation is working
correctly by turning the dial for the cylinder temperature
clockwise as far as it will go.
▶
If you have connected a control that can be used to set
the domestic hot water temperature, set the domestic
hot water temperature on the heat generator to the max-
imum possible temperature.
▶
Adjust the target temperature for the connected do-
mestic hot water cylinder to the controller.
Start-up 7
Gas Rate
Natural Gas in m³/h
− 10 %
nominal
+ 5 %
25.37
26.64
22.83
29.59
31.97
26.63
19
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