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INITIATE
(INITIAL
POWERUP
ONLY)
STANDBY
POWER
POWER
LED
DISPLAY
BURNER
OPERATING
CONTROLS
AND
INTERLOCKS
FLAME
SIGNAL
FIRING
RATE
MOTOR
1
PII MEANS PRE-IGNITION INTERLOCK.
R7120D1002 ONLY
2
FOR R7120D2000
3
- CLIP JR2 FOR INTERRUPTED PILOT WITH 15 SECONDS MFEP
- CLIP JR2 AND ADD JUMPER BETWEEN TERMINAL 8 AND M FOR INTERRUPTED PILOT WITH 30 SECOND MFEP
R7120D1002, D2000
PREPURGE
PREPURGE
HOLD
HOLD
00
00
00
TIMED
DRIVE TO
DRIVE TO
PREPURGE
HIGH FIRE
LOW FIRE
POWER
POWER
PILOT
FLAME
MAIN
ALARM
BURNER/BLOWER MOTOR
LIMITS AND BURNER CONTROLLER CLOSED
LOCKOUT INTERLOCKS CLOSED
PII CLOSED
13
1
M
TO
8
HIGH FIRE SW.
2
SAFE START CHECK
SWITCHING
10
TO
X
MOTOR ACTION
Fig. 3. Operating sequence for R7120D1002.
5
R7120D BURNER CONTROL MODULES
PFEP
10 SEC.
00
10
20
25
(4 SEC. IF
JR1 CLIPPED
MFEP
POWER
POWER
POWER
PILOT
PILOT
PILOT
FLAME
FLAME
FLAME
MAIN
MAIN
MAIN
ALARM
ALARM
ALARM
10 SEC. IGN./PILOT 5
15 SEC. PILOT 6
3
MAIN VALVE
TO
L1
3
TO
TO
3
M
D
LOW FIRE SW.
TO
FLAME PROVING
10
TO
12
00
15
RUN
POSTPURGE
STANDBY
POWER
POWER
POWER
PILOT
FLAME
MAIN
ALARM
M
7
13
1
P
1
SSC
10
11
TO
TO
10
12
M32637
66-1196EF—01
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