Burner Control Unit - Viessmann Vitoflame 100 Service Instructions For Contractors

Burner control unit LME 21....
Program sequence during commissioning
A Start command
B B' Interval before the flame has
built
C D Burner operation
D Controlled shutdown
1 qW Plug in terminals on the burn-
er control unit
Burner control unit LME 21....
t3 Pre ignition time approx. 2 s
t3n Post ignition
when a flame is
established
Function and fault displays through indicator lamps (LED)
In standard mode, operating conditions are displayed by colour code through
LED indicators A (see the following table).
The red indicator illuminates permanently after a fault shutdown. In this condi-
tion, the optical fault cause display can be activated (see program sequence on
page 25).
C
D
E
F
G
H
K
t4
approx. 2 s tw
TSA Safety time after

Burner control unit

Gas pressure switch
Electronic ignition
Burner motor
Fuel valve 1
Fuel valve 2
Air pressure switch
Flame monitoring
Interval stage I approx. 8 s
II
Dwell time 2.5 s
max. 3 s
expiry
25