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LINE VOLTAGE ALARM
BURNER MOTOR
(BLOWER)
BURNER
CONTROLLER/LIMITS
RUNNING INTERLOCK
(INCLUDING
AIRFLOW SWITCH)
INTERMITTENT
PILOT/IGNITION
MAIN FUEL VALVE(S)
IGNITION
FLAME DETECTOR
3
INITIATE
(INITIAL
POWERUP
ONLY)
POWER
LED
DISPLAY
BURNER
OPERATING
CONTROLS
AND
INTERLOCKS
PREIGNITION INTERLOCK CLOSED
FLAME
SIGNAL
1
120 VAC, 50/60 HZ POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
DO NOT CONNECT ANY WIRES TO UNUSED TERMINALS.
2
Fig. 2. Wiring subbase and sequence chart for RM7897A.
Q7800
G
12
L2
13
3
14
4
15
(L1)
5
16
17
6
2
18
7
8
19
20
9
21
10
F
22
PFEP
5
10 SEC.
10
00
00
TIMED
(4 SEC. IF
STANDBY
PREPURGE
JR1 CLIPPED
POWER
POWER
POWER
PILOT
PILOT
FLAME
FLAME
MAIN
MAIN
ALARM
ALARM
BURNER/BLOWER MOTOR
10
IGN.
INTERMITTENT PILOT
INTERRUPTED PILOT
LIMITS AND BURNER CONTROLLER CLOSED
RUNNING INTERLOCKS CLOSED
5
TO
20
SAFE START CHECK
5
RM7897A,C 7800 SERIES RELAY MODULES
FOR DIRECT SPARK IGNITION
(OIL OR GAS)
IGNITION
10
TRANSFORMER
L2
8
MAIN VALVE
PREIGNITION
INTERLOCK
10-SECOND
INTERRUPTED
PILOT
MASTER
SWITCH
L1
(HOT)
1
L2
00
20
4
MFEP
RUN
POSTPURGE
POWER
POWER
POWER
PILOT
PILOT
FLAME
FLAME
MAIN
MAIN
ALARM
ALARM
4
8
8
21
21
9
MAIN VALVE
TO
L1
6
TO
7
6
FLAME PROVING
SEE FLAME DETECTOR SPECIFICATIONS FOR CORRECT WIRING.
3
PROGRAMMED ON SETUP USING S7800A1142 DISPLAY.
4
PURGE TIME DEPENDS ON WHICH ST7800 IS INSTALLED.
5
STANDBY
POWER
PII
SSC
M22728C
32-00158—03
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