Honeywell 7800 Series Installation Instructions Manual page 21

LED
DISPLAY
INITIATE
POWER
POWER
PILOT
FLAME
MAIN
ALARM ALARM
10 SEC
STANDBY
DRIVE
INITIATE
TO
(INDEFINITE) HIGH
FIRE
BURNER
OPERATING
CONTROLS
AND
PREIGNITION INTERLOCKS CLOSED (TERM 20 ENERGIZED)
INTERLOCKS
FLAME
SIGNAL
FIRING
TERMINAL 13 TO 15
RATE
MOTOR
1 NORMAL SHUTDOWN OCCURS WHEN TERMINAL 6 IS DE-ENERGIZED.
Fig. 9. RM7838C1020/RM7838C2020 Relay Module operation.
00 00
PURGE
POWER
ALARM
PURGE
DRIVE
PURGE TIME IS SELECTABLE TO
THROUGH VARIOUS LOW
ST7800 PURGE TIMER CARDS FIRE
RM7838C ENERGIZED (TERMINAL 4 AND L2)
HF SWITCH CLOSED (TERM 19)
SAFE START CHECK
TERMINAL 13 TO 12
21
RM7838B,C 7800 SERIES RELAY MODULE
00
START PFEP
POWER
ALARM
PFEP
5 HOLD
SECONDS (INDE-
MAX FINITE) J1 INTACT (10 SEC)
J1 CLIPPED (4 SEC)
TERMINAL 6 ENERGIZED (STOP SWITCH)
LF SWITCH CLOSED (TERMINAL 18)
TERMINAL 5 ENERGIZED (COMBUSTION AIR FAN)
TERMINAL 7 ENERGIZED (COMBUSTION AIRFLOW SWITCH)
TERMINAL 21 ENERGIZED
TERM 10
TERMINAL 8 ENERGIZED (J2 INTACT)
TERMINAL 8 ENERGIZED (J2 CUT)
TERMINAL 13 TO 15
10 20 00
MFEP RUN
POWER POWER POWER
PILOT PILOT PILOT
FLAME FLAME FLAME
MAIN MAIN
MAIN
5 SEC
MFEP NORMAL
BURNER
RUN
1
(IGNITION)
(INTERRUPTED
PILOT)
TERMINAL 9
FLAME PROVING
TERMINAL
13 TO 14
M29083
(INTER-
MITTENT
PILOT)
(MAIN
VALVE)
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