Burner Control Unit Lmo 64.301; Program Sequence During Commissioning - Viessmann VITOFLAME 300 Service Instructions For Contractors

Burner control unit

Burner control unit LMO 64.301

!
Please note
An incorrect burner control unit prevents the
burner from switching off when the set boiler
water temperature has been reached and can
cause damage to the burner. The burner is
locked out if the high limit safety cut-out
responds.
Only use burner control unit LMO 64.301.

Program sequence during commissioning

A
11
F
12
G 4
6
H
M
K 3
~
a
PTC
L 8
Fig. 11
Start of oil preheat time
A
Start-up begins
B
Point of flame formation
C
Operating position
D
E Controlled shutdown
to Screwless terminals at the burner control unit
§ aS
a Oil preheat time
b Pre-ignition time
c Pre-flushing time
d Safety time
e Post-ignition time when flame
is established
f Post-flushing time
Flame monitor sensor current
■ Min. required 45 A
μ
■ Max. permissible without flame 5.5
Undervoltage
If the mains voltage drops below 165 V~, the burner
control unit initiates a safety shutdown. The system
restarts when the mains voltage rises above approx.
175 V~.
Subject to the temperature of the fuel oil supplied.
*1
14
B C D
d
b
e
c
up to 2 min
approx. 15 s
approx. 15 s
max. 10 s
approx. 3 s
approx. 90 s
A
μ
E
f
Flame monitor
F
Solenoid valve on the oil pump
G
HF ignition unit
H
Burner motor
K
Oil preheater
L
Note
*1
If power supply is 2 × 127 V and red flash code: 10 x
flashing (see chapter "Faults with flash code indica-
tion"), contact your local Viessmann sales office.
Controlled intermittent operation
After a maximum of 24 hours non-stop operation, the
burner control unit initiates an automatic safety shut-
down with subsequent restart.
Control sequence in the event of faults
If a fault shutdown occurs, the outputs for the fuel
valves and the ignition system are immediately
switched off (< 1 s).