Buderus GB142 - User Manual

GB142 Startup
• Remove the cover of the boiler and set the cover aside
• Shut the incoming gas cock off so that no gas is supplied to the unit
• On the GB142’s gas valve, located to the left of the Fan Assembly, find the inlet
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
tapping and turn on the incoming gas
• Check the gas pressure, making sure that it falls within the appropriate range
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.
• Power up the unit by turning on the On/Off switch On the BC10 control.
• Press and hold the “Chimney Sweep” button until a decimal point can be seen in
the bottom right of the display
• Once the decimal point is visible, press and hold both the Chimney Sweep and
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.
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.
• Shut off the external boiler gas valve, remove the manometer, and tighten the
slackened brass screw.
• To the right of the inlet tapping on the gas valve is the manifold tapping.
Slacken this screw and hook up the manometer so that it is reading Negative
Gas Pressure.
• Open the external gas valve
• Turn the boiler on again with the On/Off button found on the BC10
• Locate the “Service Button” and confirm the operating pressure of the heating
system is at minimum 15psi
• Cycle through back to the temperature readout on the BC10 by pressing the
Service Button again
• Press and hold the “Chimney Sweep” button until a decimal point can be seen in
the bottom right of the display
!

Summary

GB142 Startup Procedure

Initial Gas Pressure Setup

Connect manometer to measure positive gas pressure and check range for natural gas and LPG.

Boiler Power-Up and High Fire Configuration

Power unit, enter Chimney Sweep mode, and set to High Fire for capability test.

High Fire Gas Pressure Verification

Confirm gas pressure at High Fire does not drop below 3.5” W.C.

Negative Gas Pressure Setup

Connect manometer to manifold tapping to read negative gas pressure.

System Pressure Check

Turn on boiler and confirm heating system pressure is at minimum 15psi.

Air;Gas Ratio Adjustment

Check and adjust air/gas ratio on the manometer to the specified range.

Flue Gas Analysis

Insert combustion analyzer probe into flue gas test ports and measure CO2, O2, and CO content.

Buderus GB142 Specifications

General

Installation	Wall-mounted
Ignition Type	Electronic
Fuel Type	Natural Gas or Propane
Weight	34 kg
Water Pressure	1-3 bar
Max. Operating Temperature	85°C