NOL 18-100 HL
Page 14
When a burner failure is encountered the box goes
into lockout mode. This is indicated by an red light,
which displays within the lockout window of the
control and is repeated at the lockout lamp on the
panel facia.
If a lockout situation occurs, the burner will not
start until it is manually reset by pressing the
lockout window on the control. (The control can
also be reset by the off/on/reset switch situated on
the control panel facia)
If the burner fails to fire and persists in locking out,
no more than three attempts should be made.
To
do so may create a
dangerous situation.
When lockout occurs, the control can be reset
immediately. After the resetting (and also after the
correction of a fault which resulted in a controlled
shutdown, or after each mains failure) the sequence
switch always runs through to the start position,
whereby
only
selected terminals receive voltage in
accordance with the control program. It is only
then that the control unit programs a fresh burner
start up.
Note:
Do not press the lockout reset button (or
remote reset switch) for more than 10 seconds.
PLEASE NOTE.
When the control box goes to
lockout it is generally performing the function it is
designed for.
F
AULT
C
ONDITIONS
A
ND
L
OCKOUT
I
NDICATION
LAL1.25
In the event of fault conditions the sequence
switch stops and simultaneously the lockout
indicator. The symbol appearing above the reading
mark indicates the kind of fault encountered.
No start,
because, one or more of the
contacts has not closed or extraneous light
due to leaking fuel valves or faulty flame
supervision circuit.
Shut down of start up sequence,
because
the OPEN signal has not been supplied to
control box terminal 8 by the servo motor
limit switch. Terminals 6,7 and 15 remain
under voltage until the fault is corrected.
Lockout
due to a fault in the flame
supervision circuit.
Shut down of start up sequence,
because
the signal for the low flame position has not
been supplied to control box terminal 8 by
the servo motor auxiliary switch. Terminals
6,7 and 15 remain under voltage until the
fault is corrected.
Lockout,
because no flame signal has been
received on completion of the safety time.
Lockout,
because the flame signal has been
lost during burner operation or an air pressure
failure has occurred.
Lockout on completion or after completion
of the control program sequence
due to
extraneous light (e.g. flame not extinguished,
leaking fuel valves) or due to a faulty flame
signal (e.g. fault in the flame supervision
circuit or similar).
a - b
Start up sequence.
b - b’
idle steps up to the self shut down
of the sequence switch.
b(b’) - a
Post purge sequence.
1
I
a
b’
b
1
Landis & Staefa
LAL1. Program
Sequence Disk.
Summary of Contents for NOL100-38
Page 22: ...NOL 18 100 HL Page 22 NOTES...
Page 23: ...Page 23 NOL 18 100 HL...
