Honeywell RM7838B Installation Instructions Manual page 17

7800 series relay module
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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.
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
Fig. 8. RM7838C1020 Relay Module operation.
17
RM7838B,C 7800 SERIES RELAY MODULE
00
PFEP
START
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)
66-1094—08

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