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We reserve the right to make any changes due to technical modifications!
Installation and Servicing Instructions Logamax plus GB142-24/30/45/60 • Version 12/2004
Buderus Hydronic Systems • http://www.buderus.net
Start-up procedure9
z Loosen the screw plug on the measuring nipple for
the burner pressure by two rotations (fig. 30, pos. 1).
z Set the pressure gauge to zero.
z Use a hose to connect the plus terminal of the pres-
sure gauge to the burner pressure measuring nipple
(fig. 30, pos. 2).
z Switch on the heating system using the main switch.
z Press the "Chimney Sweep"
button and hold it (for
approx. two seconds) until the display shows the
decimal point.
z Press and hold the "Chimney Sweep"
and
"Service"
buttons (for approx. five seconds) until
the display shows "/[[" (e. g. /).
z Set the appliance to partial load "/" by pressing the
"Chimney Sweep"
button (higher values) or the
"Reset"
button (lower values).
z Read out the differential pressure.
The differential pressure (p
Gas
– p
Air
) must be
-0.2 inch W.C. (- 5 Pa) (±0.2 inch W.C. = ± 5 Pa)
(read-out on pressure gauge: -0.4 – 0 inch W.C.=
-10 – 0 Pa).
z Enter the value measured in the start-up report.
z If the gas/air ratio is not correct it can be adjusted
using the adjustment screw (fig. 31, pos. 1). The
adjustment screw is located behind the cover screw.
z Repeatedly press the "Service"
button until the
temperature indication is displayed.
z Press the "Chimney Sweep"
button until the
decimal point is cleared from the display.
z Switch off the heating system using the main switch.
z Remove the measurement set-up, tighten the screw
in the burner pressure measuring nipple.
z Switch on the heating system using the main switch.
Fig. 30 Checking the gas/air ratio
1
2
+
= higher values = lower values
Fig. 31 Setting the gas/air ratio
32


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