Burner Control Unit - Viessmann Vitoflame 300 VHG III Service Instructions Manual

Burner control unit

Program sequence during commissioning
A' A
TR/STB
BV2
2. Stage 2
BV2 control cam
1. Stage 1
Start
0
required input signals
control signals
Fig. 13
Note
The output signal at the solenoid valve stage 2
dependent upon the switch position of the BV2 control
cam of the solenoid valve stage 2 in the servomotor.
A Start-up begins
B Point of flame formation
C Burner operating position
t1 Pre-purge time
t40 Delay time between enabling solenoid valve stage 1
and enabling controller input
t3 Pre-ignition time
t3n Post-ignition time begins with flame
(max. until end of "TSA")
TSA Start-up safety time
Function and fault indications of the signal indicator (LED)
During standard operation, the operating conditions are indicated by LED signal indicator
codes (see the following table).
After a fault shutdown, the indicator permanently illuminates red. In this condition, the optical fault cause indicator
can be activated (see the following chapter "Burner fault sequence diagram").
B
t1
t40
t3n
t3
TSA
F
C
D Controlled shutdown
is Burner motor
E
Solenoid valve stage 2
F
Solenoid valve stage 1
H
Ignition transformer
N
Flame monitor
O
Output controller
R
min. 20 s
approx. 11 s
approx. 20 s
max. 5 s
max. 5 s
Burner control unit
D
through colour
A
15