14
®
LOCKOUTS
When a safety shutdown occurs, the control will display a message indicating LOCKOUT and the
reason for the lockout. The alarm circuit (Terminal “A”) will be energized. The non-volatile memory
will remember the status of the control even if a power failure occurs. By momentarily depressing the
reset button on the display, the control can be reset. The button must be held down for one second and
then released. Very little force is required to do this. Do not press hard.
Safety Shutdown
1.
If the running interlock circuit does not close, the control will lockout and the blower motor will
be de-energized. If the interlock circuit opens during a start-up or firing period, all fuel valves
will be de-energized and the control will lockout.
2.
If the proven high fire circuit (D-8) has not closed after a ten (10) minute “Hold” period at the
start of prepurge, the control will lockout.
3.
If the low fire start circuit (M-D) has not closed after a ten (10) minute “Hold” period at the end
of prepurge, the control will lockout.
4.
If dipswitch 6 is in the “Up” position (3-P prove open to start-enabled), and the 3-P circuit is
closed at the start of the operating cycle, the control will hold for one (1) minute waiting for the
3-P circuit to open. If, after one (1) minute, the 3-P circuit does not open, the control will lock-
out.
5.
If pilot flame is not detected during the 10 second trial for ignition period, the pilot valve and
ignition transformer will be de-energized and the control will lockout on safety.
6.
If main flame is not detected at the end of the main flame trial for ignition period, all fuel valves
will be de-energized and the control will lockout on safety.
7.
If the main flame fails during a firing cycle, all fuel valves will be de-energized within 4 seconds
maximum, after loss of flame signal and the control will lockout on safety.
8.
The EP165 and EP166 programmers will lockout on a power interruption.
9.
If flame is detected when the operating control (L1-13) is open, the control will wait sixty (60)
seconds and then lockout if flame is still present. If the operating control closes and flame is
detected during purge, the blower motor (term M) remains energized and the purge sequence is
put on hold. If the flame signal goes away within sixty (60) seconds, the control will proceed
with a normal start-up. If flame signal is still present after sixty (60) seconds, the control will
lockout.
NOTE: Manual Reset is required following any safety shutdown.
NOTE: Depressing and releasing the reset button during a cycle will cause the control to shut the
burner down and recycle.
DESCRIPTION OF FUNCTIONS OF OPERATING CONTROLS
1.
Operating Controls:
Generally pressure or temperature activated, the operating control closes,
causing the burner start-up sequence to begin. When the operating control opens, the burner
shuts off. The operating control is connected in the L1-13 circuit on the wiring base.
2.
Limit Switches
: These are generally pressure, water level or temperature activated
a.
Recycle —when it is desired to stop the burner when the limit switch opens and restart it
when the limit switch reclosed, they are connected between Terminals L1 and 13.
b.
Non-Recycle —when it is necessary to stop the burner when the limit switch opens and
prevent it from starting until both the limit switch recloses and the manual reset is activated,
they are connected between terminals 3 and P.
*
*
Refer to programmer selection on page 9 to determine which programmers offer non-recycle operation of the running inter-
lock circuit (ckt. 3-P).
