7
Recommissioning the heating system
Logano plus GB312 - Technical specifications are subject to change without prior notice
49
7.12.1 CO
2
content, natural gas type A (minimum
output)
If CO
2
content is below 9.0% or above 9.5%.
V
Adjust the level to 9.1% CO
2
using the low-output
adjusting screw.
– Turning the screw clockwise increases the CO
2
level.
– Turning the screw counter-clockwise reduces the
CO
2
level.
7.12.2 Reading off and comparing CO
2
levels
V
After reading off the CO
2
level or adjusting on the Mon-
itor readings/Burner menu, read off the flame ionization
current and compare with the specified levels.
Fig. 46 Checking CO
2
setting at medium output
1
Low-output adjusting screwGas valve: Honeywell
V4730C
2
Cap screw
7.13 Checking and monitoring CO
2
level
at maximum output
V
Press the
button to increase the boiler output to a
higher percentage.
V
Read off output on RC35 or using Service Key.
V
Wait until output reaches at least 70%.
V
Check CO
2
content again.
V
Read off flame ionization current (and compare with the
specified levels).
7.14 Recording measured values
V
Take the following readings at a testing point on the
flue pipe and record them in the commissioning log
(
Æ
Section 7.20, page 54):
– Flue pressure
– Flue gas temperature t
A
– Carbon dioxide content (CO
2
) or oxygen content
(O
2
)
– Carbon monoxide content (CO)
Fig. 47 Recording measured values
1
Recommended location for testing point on flue pipe
7 747 010 720-51.2RS
2
1
7 747 010 720-60.1RS
1
