21
0 Second post purge on operating control open.
15 Second post purge on flame fail.
Non-recycle operation on flame fail.
Recycle operation on air flow failure.
CHARTS
0 Second post purge on operating control open.
15 Second post purge of flame fail during PTFI, Proving and MTFI.
Lockout on flame fail during PTFI, Proving and MTFI.
Relight operation on main flame fail.
Recycle operation on air flow failure.
Reset from lockout from pushbutton on line voltage.
OPTIONAL PLUG-IN BOARDS
Description
A family of optional plug-in boards are available separately for the MicroM chassis to provide
remote reset, remote alpha-numeric display and serial communications as a stand alone or in combi-
nation. Refer to ORDERING INFORMATION for MicroM Chassis types for units that have pre-
installed functions.
TYPE MEP304
PROGRAMMING SEQUENCE
L1/7
ON
PURGE
COMPLETE
FIRING
PERIOD
L1/7
OFF
10 SEC
PTFI
5 SECOND
PURGE
8
T
E
R
M
I
N
A
L
S
3
4
5
POST PURGE
(SEE NOTE)
INTERLOCK
AIR FLOW
PROVEN
5 SEC
PILOT
PROVING
5SEC
MTFI
INTERRUPTED
PILOt
TYPE MEP397
PROGRAMMING SEQUENCE
L1/7
ON
PURGE
COMPLETE
FIRING
PERIOD
L1/7
OFF
7 SEC
PTFI
1 5 SECOND
PURGE
8
T
E
R
M
I
N
A
L
S
3
4
5
POST PURGE
(SEE NOTE)
INTERLOCK
AIR FLOW
PROVEN
5 SEC
PILOT
PROVING
5SEC
MTFI
INTERRUPTED
PILOT
