38
Phase
A
P
0
Input not assessed
Input must be active
for continued
operation
Input must be passive
for continued operation
Signal
change
expected for continued
operation
Output is active
Will
be assessed subject
to output
Air pressure switch 1
Gas
pressure
switch 1
Air pressure switch 2
Fan speed
Flame
Demand
Fuel valve BV2
Auxiliary valve/ Servomotor
Flue gas damper
Ignition
Fan
Fuel valve BV1
Fault message output
3
Input assessment
Output control
Subsequent state depends on
valve test parameters.
1
2
4
5
6
8
U
System
start
Relay test
Start-up
Op.
mode
Shutdown
Fault states
F
7
C
Waiting
Fig. 31
Description of state:
Phase
Display
Description
Duration
System start
"A"
System start
10 s
Initialisation of fault meter
0.1 s
Mains test, gas pressure
1 s
Fan ramp-up, system start
max. 20 s
Forced ventilation, system start
20 s
Burner control unit
Burner control unit flow chart
5812086
Codes
