Buderus 600 - 11S Installation And Maintenance Instructions Manual page 27

2.1.11 Measure gas-supply pressure (flow pressure)
Open at least one radiator thermostat valve.
CAUTION
The condensing gas boiler must not be
activated at this stage.
Turn the chimney-sweep switch (fig. 35, item 4) to
position "1".
Loosen the screw plug on the gas test nipple (fig. 36) by
two turns.
Attach the pressure-gauge connection hose to the gas test
nipple (fig. 37).
Slowly open the gas shutoff valve.
Turn the power switch (fig. 35, item 2) to position "I".
The burner should ignite after about 30 seconds.
Measure the gas connection pressure and note it down on
the report form.
The gas-connection pressure must be:
for natural gas H min. 17 mbar, max. 25 mbar, nominal
connection pressure 20 mbar
for LPG min. 30 mbar, max. 50 mbar, nominal connection
pressure 37 mbar.
Detach the gauge-connection tube once more and close
the test nipple at the screw plug.
Ensure that switch is returned to "0" after this task has been
carried out.
.
NOTE
If the required connection pressure is not
available or too high, contact your gas supplier
or TRANSCO.
Ensure all disturbed joints and connections are checked for
gas tightness on completion of tasks.
2.1.12 Check the gas/air ratio and adjust as required
Turn mains power switch (fig. 35, item 2) and chimney-
sweep switch (fig. 35, item 4) to "0".
Unscrew the sealing closure of the burner-pressure testing
nipple by one turn (fig. 36).
Connect the positive port of the pressure gauge with a
hose to the burner pressure measuring nipple (fig. 37).
Turn mains power switch to "I" and chimney-sweep switch
to "1".
If the burner has fired after approx. 30 seconds, keep the
service button (fig. 35, item 3) pressed until "Y" appears on
the display.
Turn the hot-water temperature controller (fig. 35, item 1)
to "1".
Read the differential pressure.
The differential pressure (p
(±5 Pa) (display on measuring gauge: -10 Pa to 0 Pa).
Subject to modifications resulting from technical improvements!
Installation and maintenance instructions for wall-mounted condensing gas boiler 600 - 11S/19S/24S/24C • 02/2006
– p ) should total -5 Pa
GAS AIR
Initial start-up
2
Fig. 35 Mains switch, service button and chimney-sweep
switch
Fig. 36 Measure the gas connection pressure
Fig. 37 Check the gas/air ratio
Buderus • http://www.buderus-domestic.co.uk
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