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Function
Startup
Undervoltage detection
Reversed polarity
protection
Control sequence
AC 220...240 V
AC 100...110 V
t1
Prepurge time
t3
Preignition time
t3´
Preignition time from start of «TSA»
TSA
Ignition safety time
TSAmax.
Max. ignition safety time
t3n
Postignition time
t4
Interval «BV1 – BV2»
10/15
Building Technologies Division
The relevant function diagram shows the required or permissible input signals to the
control section and to the flame supervision circuit hatched (refer to Connection
diagrams).
If these input signals are not present, the burner control will stop the startup sequence to
trigger lockout where required by safety regulations.
Burner control reset
The contacts of the gas pressure switch (GP), the limit thermostat / pressure switch
(W), the control thermostat / pressurestat (R) and safety limit thermostat (SB) must
be closed, heat request
Fan motor (M) connected
Air pressure switch (LP) is in idle position
No undervoltage
Flame detector darkened, no extraneous light
An additional electronic circuit ensures that, if the mains voltage drops below
approximately AC 165 V, the burner startup will be prevented or a lockout will be
triggered.
If the connections of live conductor (terminal 12) and neutral conductor (terminal 2) have
been mixed up, the burner control will initiate lockout at the end of the safety time (TSA).
(Times in seconds)
)
1
LGA41.153A27
---
---
15
---
5
10
Max. 2
Approx. 18
¹)
All times specified apply to AC 220 V and AC 110 V respectively
For AC 240 V operations, above times are to be multiplied by 0.7
LGA41.173A27
LGA52.150B27
---
LGA52.150B17
---
Approx. 13
15
---
---
Max. 5
10
5
20
10
Max. 2
---
Approx. 13
Approx. 18
LGA52.171B27
LGA63.191A27
---
---
Approx. 13
Approx. 13
---
---
4.5...7.5
Max. 10
4.5...7.5
10
20
20
---
---
Approx. 13
Approx. 23
CC1N7418en
21.06.2016
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