Carrying Out A Leak Test In Operating Conditions; Measuring The Carbon Monoxide Content (Co); Function Testing; Measuring The Ionization Current - Buderus Logamax plus GB142-24 Installation Instructions Manual

8
Start-up procedure
▶ Set the boiler to partial load "L30" by pressing the "Chimney
d
Sweep" button (higher values) or the "Reset"
values).
▶ Read out the differential pressure. The differential pressure (p
p ) must be -0.02 inch W.C. (- 5 Pa) (±0.02 inch W.C. = ± 5 Pa)
Air
(read-out on pressure gauge: -0.04 – 0 inch W.C. = -10 – 0 Pa).
▶ Enter the value measured in the start-up report.
▶ If the gas/air ratio is not correct it can be adjusted using the
adjustment screw ( fig. 39, [1]). The adjustment screw is located
behind the cover screw.
1
Fig. 39 Setting the gas/air ratio
▶ Repeatedly press the "Service"
indication is displayed.
d
▶ Press the "Chimney Sweep"
cleared from the display.
▶ Switch off the heating system using the main switch.
▶ Remove the measurement set-up, tighten the screw in the burner
pressure measuring nipple.
▶ Switch on the heating system using the main switch a.
8.9

Carrying out a leak test in operating conditions

▶ Check all gaskets and joints in the burner gas circuit for leaks while
the burner is operational, using a foaming agent.
DANGER:
Leaks may be caused to pipes and screw connections
during start-up activities if flammable gas explodes.
▶ Only use approved leak detection agents for leak
detection such as a soapy water solution.
CAUTION:
due to a short circuit.
▶ Cover damageable parts before leak testing.
▶ Do not spray the leak testing agent onto cables, plugs
or electrical connection lines. Do not allow it to drip
onto them either.
24
c
button (lower
Gas
72150200-37.1TD
e
button until the temperature
button until the decimal point is
8.10

Measuring the carbon monoxide content (CO)

▶ Measure the carbon monoxide content on the flue gas sampling point
( fig. 40).
–
Fig. 40 Flue gas sampling point
The CO values in an air-free condition must be below 400 ppm or
0.04 vol. %. Values of 400 ppm and up indicate that the burner
adjustment may be wrong, the gas burner fitting or the heat exchanger
are dirty or that there may be burner faults.
▶ You must establish and resolve the cause. The boiler must be
operational when you do this.
8.11

Function testing

▶ You must check the functioning and, if readjustment is possible, the
adjustment of all control, regulating and safety devices when
carrying out start-up tests, annual inspections or maintenance as
required.
▶ You must also test the gas and water lines for leaks.
8.12

Measuring the ionization current

▶ Switch off the heating system using the main switch b.
▶ Disconnect the plug and socket connection of the monitoring cable
and connect the measuring device in series ( fig. 41). Select the
μA direct current range on the measuring device. The measuring
device must have a resolution of at least 1 μA.
Fig. 41 Measuring the ionization current
Logamax plus GB142-24/30/45/60 – 6720820104 (2017/05)
72150200-38.1TD
72150200-39.1TD