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R7140G,L,M BURNER CONTROL MODULES
66-1153—03 14
Fig. 9. Operating sequence, R7140L1009 and R7140L2007.
R7140L
POWER
00
OPERATING
CONTROLS
AND
INTERLOCKS
BURNER
FLAME
SIGNAL
FIRING
RATE
MOTOR
INITIATE
(INITIAL
POWERUP
ONLY)
POWER
STANDBY
POWER
PREPURGE
HOLD
DRIVE TO
HIGH FIRE
PREPURGE
HOLD
DRIVE TO
LOW FIRE
POWER
PILOT
FLAME
MAIN
POWER
PFEP
10 SEC.
(4 SEC. IF
JR1
CLIPPED
PILOT
FLAME
MAIN
POWER
MFEP
PILOT
FLAME
MAIN
RUN
POWER
POSTPURGE
POWER
STANDBY
00 00 10 25 00 1520
SWITCHING
MOTOR ACTION
BURNER/BLOWER MOTOR
IGN.
LIMITS AND BURNER CONTROLLER CLOSED
LOCKOUT INTERLOCKS CLOSED
PII CLOSED
LOW FIRE SW.
SAFE START CHECK
FLAME PROVING
10 SEC. IGN./PILOT
5
18
8
5 SEC.
16
TO
16 TO
16TO
8
13
TO
10 11
TO
10 11
TO
M23322
HIGH FIRE SW.
15TO
10 14
TO
10 14
TO
8
4
3
L1
MAIN VALVE
7
TIMED
PREPURGE
POWER
FLAME
MAIN
PILOT
ALARM
POWER
FLAME
MAIN
PILOT
ALARMALARMALARMALARM
00
SSC
LED
DISPLAY
15 SEC. PILOT 6
1
2
1
FOR R7140L1009:
L1 TO 4.
4 TO 3.
2
PII MEANS PRE-IGNITION INTERLOCK.
1