Control sequence under fault conditions and lockout indication
Whenever a fault occurs, the sequence switch stops and with it the lockout indicator.
The symbol appearing above the reading mark indicates the type of fault:
No start
=
Interruption of
startup sequence
P
Lockout
Lockout
>
Interruption of
startup sequence
1
Lockout
I
Lockout
Lockout indicator
Building Technologies
HVAC Products
•
One of the contacts is not closed (also refer to «Preconditions for burner startup»)
•
Extraneous light:
Lockout during or after completion of the control program
Examples:
– Nonextinguished flame
– Leaking fuel valves
– Faulty flame supervision circuit
•
No «OPEN» signal at terminal 8 from the changeover end switch «a»
•
Terminals 6, 7 and 15 are live until fault has been corrected
Does not apply to LAL1...:
•
No air pressure indication at the beginning of the air pressure check
•
Air pressure failure after the air pressure check
•
Defect in the flame supervision circuit
•
No positioning signal at terminal 8 from the auxiliary switch «m» for the low-fire posi-
tion
•
Terminals 6, 7 and 15 are live until fault has been corrected
•
No flame signal at the end of the safety time «TSA»
•
Flame signal has been lost during operation
LAL1
•
Burner control can immediately be reset after lockout:
– Do not press the lockout reset button for more than 10 seconds
•
The sequence switch always travels to the start position first
– After resetting
– After rectification of a fault that led to shutdown
– After each power failure
During this period of time, power is only fed to terminals 7 and 9...11.
•
Then, the LAL.... will program a new burner startup sequence
LAL2..., LAL3..., LAL4...
a-b
Startup sequence
b-b´
Idle steps
(with no contact confirmation)
b (b´)-a Postpurge program
11/20
CC1N7153en
20.04.2005