Operation - Honeywell 7800 Series Installation Instructions Manual

OPERATION

Sequence of Operation
The RM7838B,C has the operating sequences listed below. The RM7838B,C LED provide positive visual indication of the
program sequence: POWER, PILOT, FLAME, MAIN and ALARM. Fig. 26 shows the operating sequence.
LED
DISPLAY
N I T I A I T E
POWER
POWER
PILOT
FLAME
MAIN
ALARM ALARM 1
10 SEC
INITIATE STANDBY
(INDEFINITE)
BURNER
OPERATING
CONTROLS
AND
INTERLOCKS
FLAME
SIGNAL
FIRING
TERMINAL 13 TO 14
RATE
MOTOR
1 ALARM IS OFF FOR RM7838C.
2
ALARM (TERMINAL 3) IS DE-ENERGIZED AS SOON AS FLAME IS DETECTED (RM7838B ONLY). (OFF FOR RM7838C)
3
NORMAL SHUTDOWN OCCURS WHEN TERMINAL 6 IS DE-ENERGIZED.
4
15 SECONDS FOR RM7838C.
5 VALVE PROVING OCCURS CONCURRENT WITH PURGE IF "BEFORE", "BOTH", OR "SPLIT" SELECTED.
6 VALVE PROVING OCCURS HERE IF "BOTH" OR "SPLIT" SELECTED.
7 POSTPURGE OCCURS NOW IF SELECTED. VALVE PROVING WILL ALSO OCCUR CONCURRENTLY.
8 COMBUSTION AIR FAN AND AFS REMAIN ON FOR COMPLETION OF VPS AND/OR POSTPURGE IS COMPLETE.
5
00 00
P U R G E
POWER
ALARM
1
DRIVE
PURGE
TO PURGE TIME IS SELECTABLE
HIGH THROUGH VARIOUS
FIRE ST7800 PURGE TIMER CARDS
RM7838B/C ENERGIZED (TERMINAL 4 AND L2)
TERMINAL 3 ENERGIZED (ALARM)
HF SWITCH CLOSED (TERM 19)
PREIGNITION INTERLOCKS CLOSED (TERM 20 ENERGIZED)
SAFE START CHECK
TERMINAL 13 TO 12
Fig. 26. RM7838B,C Relay Module operation.
RM7838B, RM7838C 7800 SERIES RELAY MODULES
00
S T A R T PFEP
POWER
ALARM
1
DRIVE 5 HOLD
PFEP
TO SECONDS (INDE-
LOW MAX FINITE) J1 INTACT (10 SEC)
FIRE J1 CLIPPED (4 SEC)
TERMINAL 6 ENERGIZED (LIMITS/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 14
19
10 20
M F E P R
POWER POWER POWER
PILOT
PILOT PILOT
FLAME
FLAME FLAME
MAIN MAIN MAIN
4
10 SEC
HOLD
MFEP NORMAL
(INDEFINITE)
BURNER
RUN
J3 INTACT
2
(IGNITION)
(INTERRUPTED
TERMINAL 9
FLAME PROVING
TERMINAL
13 TO 15
M23680
6 7
00
U N
3
8
8
(INTER-
MITTENT
PILOT)
PILOT)
(MAIN
VALVE)
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