R7120D BURNER CONTROL MODULES
5
66-1196EF—01
Fig. 3. Operating sequence for R7120D1002.
R7120D1002, D2000
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 15
20
SWITCHING
MOTOR ACTION
BURNER/BLOWER MOTOR
LIMITS AND BURNER CONTROLLER CLOSED
LOCKOUT INTERLOCKS CLOSED
PII CLOSED
LOW FIRE SW.
SAFE START CHECK
FLAME PROVING
10 SEC. IGN./PILOT 5
M
13
TO
3 TO
3
TO
M
D
TO
10
11
TO
10
X
TO
M32637
HIGH FIRE SW.
8
TO
10
12
TO
10
12
TO
M
13
P
L1
MAIN VALVE
7
TIMED
PREPURGE
POWER
FLAME
MAIN
PILOT
ALARM
POWER
FLAME
MAIN
PILOT
ALARM
ALARM
ALARM
ALARM
00
SSC
LED
DISPLAY
15 SEC. PILOT 6
1
1
3
2
2
3
1
PII MEANS PRE-IGNITION INTERLOCK.
R7120D1002 ONLY
FOR R7120D2000
- 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
1