16
®
EP(D)160 LOGIC FLOW DIAGRAM NORMAL CYCLE
MODULATOR HELD
AT LOW FIRE
MODULATOR SENT
FROM AUTO TO
LOW FIRE
MODULATOR SENT
FROM LOW FIRE
TO AUTO
BLOWER STOPS 15 SEC. AFTER L1-13 OPENS
STANDBY
L1-13 OPEN
19
TERMINAL 7 DE-ENERGIZED
18
DEMAND SATISFIED L1-13 OPENS
17
TERMINAL 7 REMAINS POWERED
16
TERMINAL 6 CUT OUT 15 SEC AFTER 7 CUT IN
14
TERMINAL 5 CUT OUT 10 SEC. AFTER 7 CUT IN
13
MAIN FUEL POWERED ON TERMINAL 7 AT END OF PTFI
12
SPARK & PILOT POWERED ON TERMINALS 5 & 6
10
YES
YES
YES
LOW FIRE PURGE COMPLETED IN 30 SEC.
8
HIGH FIRE PURGE COMPLETED IN 30 SEC.
7
YES
NO
NO
NO
NO
NO
YES
YES
YES
NO
OPERATING CONTROL CLOSED L1-13
POWER ON TERMINALS L1 & L2
1
MODULATOR SENT
TO LOW FIRE
MODULATOR SENT
FROM LOW TO
HIGH FIRE
MODULATOR SENT
FROM HIGH FIRE
TO LOW FIRE
NO
L
L
HOLD 10 MIN. THEN LOCKOUT +
HOLD 10 MIN. THEN LOCKOUT +
15
IS FLAME PROVED?
IS FLAME PROVEN WITHIN 10 SEC?
IS LOW FIRE INTERLOCK MADE? M-D
ARE LIMITS L1 TO 13 MADE?
3
4
5
6
POST PURGE
CYCLE COMPLETE
AUTO
FLAME SIGNAL
MTFI
FLAME SIGNAL
PTFI
FLAME SIGNAL
PTFI
IGNITION TIMING
PURGE
HIGH FIRE PURGE
L
L
0:05
0:05
0:02
19
35
40
STANDBY
L1-13 OPEN
2
IS F.V.E.S. MADE 13-3
IS AIR FLOW SWITCH MADE? 3-P
IS HIGH FIRE INTERLOCK MADE? D-8
PURGE
LOW FIRE PURGE
0:40
+ LOCKOUT AND HOLD MESSAGES ARE EXPLAINED IN THE FOLLOWING PAGES.
9
11
