38
Service Manual
Fig: Gas combination valve
• Program selector switch on
• Restart the boiler by pressing the “Suppress button“.
• App. 20 seconds after the burner starts, check the
CO
2
content with the CO
2
measuring device and
readjust as needed with the zero-point screw. This
setting must be made within 120 sec. after the
burner starts. If needed repeat the start phase in
order to make the setting by pushing the “Suppress“
button.
• Turn to the right - CO
2
increases!
• Turn to the left - CO
2
decreases!
CO2 test at lower charging (soft start)
• Take device out of service; reseal measurement
openings and hose connection nipple, and check
for leaks.
• Replace cover.
Setting work is completed
TGB-20 / TGB-K-20/GB-20(-S)
Natural gas E/LL
Liquified petroleum gas B/P
8.8% to 9.3%
10.5% to 11.5%
TGB-11
Natural gas E/LL
Liquified gas P
8.8% to 9.3%
10.7% to 11.5%
Gas flow screw
Zero-point
screw