Vaillant ecoCRAFT VKK GB SERIES Installation And Maintenance Instructions Manual - page 27
27
Installation and maintenance instructions ecoCRAFT - 0020055744_03
6.5.1
Checking the connection pressure
(Gas flow pressure)
1
Fig. 6.2 Checking the gas flow pressure
Key
1 Pressure measurement nipple
Proceed as follows to check the connection pressure:
• Remove the unit's front casing.
• Lift the front cover.
• Unfasten the screw on the pressure measurement nip-
ple (1) ahead of the gas valve.
• Connect a pressure gauge.
• Start up the unit.
• Switch the unit to maximum output in Test Mode; se-
lect "Chimney sweep" operating state by pressing "+"
and "-" simultaneously.
• Measure the connection pressure in comparison with
atmospheric pressure. The measured pressure must
be not less than 17mbar.
a
Caution!
If the connection pressure (gas flow pressure)
is not less than 17mbar, no adjustment should
be undertaken, and the unit must not be
started up!
In this case proceed as follows:
• Take the appliance out of operation.
• Remove the pressure gauge and tighten the screw on
the pressure measuring nipple (1) again.
If you cannot rectify the fault, do not start up the unit
and inform the gas supply company.
a
Caution!
Malfunction!
The combustion air must be free of particles or
the burner can be contaminated with dirt.
Take particular care that no building dust or
fibres of insulating material are present in the
combustion air.
6.5.2 Checking
the
CO
2
content
The opening for the CO
2
measurement must be made in
the customer side of the flue pipe.
a
Caution!
Risk of measurement errors caused by the in-
gress of leakage air!
Make sure that the opening for the measuring
probe is well sealed during the measurement to
prevent the ingress of leakage air!
h
Note!
The maximum draught must not exceed
20 mbar, as otherwise the results of the CO
2
measurement will be invalid. If necessary you
can remove the cover of the inspection opening
in the external flue gas ducting during the
measurement and then replace it after the
measurement.
Note!
Note regarding the test programs:
The Test Mode is automatically exited after
15 minutes. If you have not been able to com-
plete the measurement in this time period, the
Test Mode must be re-activated.
Testing at rated load
• Start the "P1" test program for rated output.
• Press and hold the "+" button.
• Press the "Fault resolution" button.
• Hold the "+" button until "P0" appears.
• Switch to "P1" with the "+" button.
• Start the test program by pressing the "i" button.
After a stabilising period of one minute, the boiler is run
at its rated output.
Start-up 6