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.
15 Second post purge
Non-recycle operation on flame failure.
Recycle operation on air flow failure.
Reset from lockout from pushbutton.
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
INTERLOCK
AIR FLOW
PROVEN
5 SEC
PILOT
PROVING
10 SEC
MTFI
INTERRUPTED
PILOT
TYPE MEP335
PROGRAMMING SEQUENCE
L1/7
ON
PURGE
COMPLETE
FIRING
PERIOD
L1/7
OFF
35 SEC
HSI
30 SECOND
PURGE
8
T
E
R
M
I
N
A
L
S
3
4
5
15 SEC
POST PURGE
INTERLOCK
AIR FLOW
PROVEN
3 SEC
PTFI
5 SEC
PILOT
PROVING
INTERMITTENT
PILOT