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RM7897A,C 7800 SERIES RELAY MODULES
LINE VOLTAGE
ALARM
BURNER MOTOR
(BLOWER)
BURNER
CONTROLLER/LIMITS
RUNNING INTERLOCK
(INCLUDING
AIRFLOW SWITCH).
10 SEC. INTERRUPTED
PILOT/IGNITION
MAIN FUEL VALVE(S)
IGNITION
FLAME DETECTOR
LED
DISPLAY
BURNER
OPERATING
CONTROLS
AND
INTERLOCKS
FLAME
SIGNAL
1
120 VAC, 50/60 HZ POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
2
DO NOT CONNECT ANY WIRES TO UNUSED TERMINALS.
3
PROGRAMMABLE POST PURGE TIMING USING S7800A1142 KDM.
32-00158—03
G
L2
3
4
5
6
7
8
9
10
F
4
INITIATE
(INITIAL
00
POWERUP
ONLY)
STANDBY
POWER
POWER
LIMITS AND BURNER CONTROLLER CLOSED
PREIGNITION INTERLOCK CLOSED
SAFE START CHECK
Fig. 3. Wiring subbase and sequence chart for RM7897C.
Q7800
FOR DIRECT SPARK IGNITION
12
(OIL OR GAS)
IGNITION
10
13
TRANSFORMER
8
14
9
MAIN VALVE
15
(L1)
16
17
2
18
19
20
DELAYED
(2ND STAGE)
21
MAIN VALVE
22
MASTER
SWITCH
PFEP
10 SEC.
5
00
10
6
TIMED
(4 SEC. IF
PREPURGE
JR1 CLIPPED
MFEP
POWER
POWER
POWER
PILOT
PILOT
PILOT
FLAME
FLAME
FLAME
MAIN
MAIN
MAIN
ALARM
ALARM
ALARM
BURNER/BLOWER MOTOR
10
IGNITION
INTERRUPT/PILOT
8
MAIN VALVE
DELAYED MAIN VALVE
L1
6
RUNNING INTERLOCK
5
TO
20
FLAME PROVING
4
SEE FLAME DETECTOR SPECIFICATIONS FOR CORRECT WIRING.
5
PURGE TIME DEPENDS ON WHICH ST7800 IS INSTALLED.
RM7897C1018 IS 14 SECONDS FOR 4 SECOND MFEP.
6
6
L2
PREIGNITION
INTERLOCK
L1
(HOT)
1
L2
20
00
3
RUN
POSTPURGE
STANDBY
POWER
POWER
POWER
PILOT
FLAME
MAIN
ALARM
4
9
21
6
TO
7
TO
PII
SSC
M22729C
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