Dungs MPA22 - Operating Mode Flowchart: Electronic Gas Firing (Continued); Post-Venting and Standby States

Printed in Germany / M-MT-BOS
• Edition 11.99 • # 231 763
70 … 112
Valve test, phase 4 (test time V2).
When the post-purging time expires,
the brackets G or brackets L/A symbols
and the Down arrow might also light
up while the servo drive for air is
moving to the standby position.
Post-venting with blower in operation.
Post-venting ended. The blower is off.
The servo drive for air goes to the
standby position.
With electronic modulation in gas fir-
ing mode only. Post-ventilation termi-
nated. The blower is OFF. Gas servo-
motor is moved into idling position.
If a wait is programmed or if low gas
supply is detected during the start
phase, the wait is counted down.
Minutes on the left, seconds on the
right.
Standby, wait for request for heat.
Setup mode and parameterisation
mode can be activated. See setup
mode, "Gas firing, electronic modula-
tion", "Gas firing, pneumatic modula-
tion", and "Display in parameterisation
mode".
P
S
i
G
L/A
h
l,m
3
P
S
i
G
L/A
h
l,m
3
P
S
i
G
L/A
h
l,m
3
P
S
i
G
L/A
h
l,m
3
P
S
i
G
L/A
h
l,m
3
If wait = 0
6
5
P
S
i
G
L/A
h
l,m
3
Display in operating mode
Gas firing, electronic
modulation
Gas firing, pneumatic
modulation