Buderus GB142 Startup Manual

Remove the cover of the boiler and set the cover aside

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Shut the incoming gas cock off so that no gas is supplied to the unit
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On the GB142's gas valve, located to the left of the Fan Assembly, find the inlet
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tapping, and slacken brass flat head screw approximately 2 full turns.
Hook up a manometer so that it is reading Positive Gas Pressure onto this
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tapping and turn on the incoming gas
Check the gas pressure, making sure that it falls within the appropriate range
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3.5 to 10.5 inch W.C. Natural Gas and 8.0 to 13.0 inch W.C. LPG
Turn on the gas valve.
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Power Up The Unit By Turning On The On/Off Switch On the BC10 control.
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Press and hold the "Chimney Sweep" button until a decimal point can be seen in
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the bottom right of the display
Once the decimal point is visible, press and hold both the Chimney Sweep and
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the Service buttons at the same time until "L - -" is visible on the display. This
is telling you that the boiler is going to fire off and modulate to 100% of its
capability.
Check the gas pressure with the manometer once the unit has reached High Fire.
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Confirm that it does not drop below 3.5" W.C. If it does, check gas pipe sizing
per the relevant gas pipe sizing chart.
Turn off of the boiler using the On/Off button on the BC10 boiler control.
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Shut off the external boiler gas valve, remove the manometer, and tighten the
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slackened brass screw.
To the right of the inlet tapping on the gas valve is the manifold tapping.
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Slacken this screw and hook up the manometer so that it is reading Negative
Gas Pressure.
Open the external gas valve
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Turn the boiler on again with the On/Off button found on the BC10
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Locate the "Service Button" and confirm the operating pressure of the heating
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system is at minimum 15psi
Cycle through back to the temperature readout on the BC10 by pressing the
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Service Button again
Press and hold the "Chimney Sweep" button until a decimal point can be seen in
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the bottom right of the display
GB142 Startup