Operation; Fig. 21-Operation Of The Rm7838B Relay - Honeywell 7800 Series Manual

Fig. 21—Operation of the RM7838B Relay Module (not using pilot valve hold).
LED
DISPLAY
INITIATE
POWER
POWER
PILOT
FLAME
MAIN
ALARM ALARM
10 SEC.
STANDBY
DRIVE
INITIATE
TO
(INDEFINITE)
H. F.
BURNER
OPERATING
CONTROLS
AND
PREIGNITION INTERLOCKS CLOSED (TERM. 20 ENERGIZED)
INTERLOCKS
FLAME
SIGNAL
FIRING
TERMINAL 13 TO 14
RATE
MOTOR
1 WHEN CONFIGURATION JUMPER J3 IS CLIPPED, THE RM7838B AUTOMATICALLY CONTINUES INTO THE MFEP (NO WAITING TIME BETWEEN THE PFEP AND MFEP).
2 ALARM (TERMINAL 3) IS DEENERGIZED AS SOON AS FLAME IS DETECTED.
NORMAL SHUTDOWN OCCURS WHEN TERMINAL 6 IS DEENERGIZED.
3
00 00
PURGE
POWER
ALARM
PURGE
DRIVE
PURGE TIME IS SELECTABLE TO
THROUGH VARIOUS L. F.
ST7800 PURGE TIMER CARDS
RM7838B ENERGIZED (TERMINAL 4 AND L2)
TERMINAL 3 ENERGIZED (ALARM)
TERMINAL 6 ENERGIZED (START/STOP SWITCH)
H F. SWITCH CLOSED (TERM. 19)
SAFE START CHECK
TERMINAL 13 TO 12
00
START PFEP
POWER POWER
PILOT
FLAME
MAIN
ALARM
PFEP
5 HOLD
SECONDS (INDE-
MAX. FINITE) J1 INTACT-10 SEC.
J1 CLIPPED-4 SEC.
L. F. SWITCH CLOSED (TERMINAL 18)
TERMINAL 5 ENERGIZED (COMBUSTION AIR FAN)
TERMINAL 7 ENERGIZED (COMBUSTION AIRFLOW SWITCH)
TERMINAL 21 ENERGIZED
TERM. 10 (IGNITION)
TERMINAL 8 ENERGIZED (J2 INTACT)
TERMINAL 8 ENERGIZED (J2 CUT)
TERMINAL 13 TO 14
25
10 20
MFEP RUN
POWER POWER
PILOT
PILOT
FLAME FLAME
MAIN MAIN
10 SEC.
1 MFEP NORMAL
HOLD
(INDEFINITE)
BURNER
RUN
J3 INTACT
2
(INTERRUPTED
PILOT)
TERMINAL 17
TERMINAL 9
FLAME PROVING
TERMINAL
13 TO 15
65-0120—1
RM7838B

OPERATION

00
3
(INTER-
MITTENT
PILOT)
(STARTS
MFEP)
(MAIN
VALVE)
M9745