Honeywell 7800 SERIES User Manual

65-0120—1 26
RM7838B
OPERATION
INITIATE
POWER PILOT FLAME MAIN
ALARM ALARM
STANDBY
(INDEFINITE)
POWER
ALARM
POWER
DRIVE
TO
H. F.
DRIVE
TO
L. F.
DRIVE
TO
L. F.
MAIN
VALVE
PFEP HOLD
5
SECONDS
MAX.
10 SEC. 10 SEC.10 SEC. 10 SEC.45 SEC.
HOLD
(INDE-
FINITE)
HOLD (INDEFINITE)
PURGE
PREPURGE TIME IS
SELECTABLE THROUGH
VARIOUS ST7800
PURGE TIMER CARDS
PFEP
J1 INTACT-10 SEC.
J1 CLIPPED-4 SEC.
MFEP MFEP
NORMAL
BURNER
RUN
NORMAL
BURNER
RUN
RM7838B ENERGIZED (TERMINAL 4 AND L2)
TERMINAL 3 ENERGIZED (ALARM)
TERMINAL 6 ENERGIZED (START/STOP SWITCH)
L. F. SWITCH CLOSED (TERMINAL 18)
H F. SWITCH CLOSED (TERM. 19)
PREIGNITION INTERLOCKS CLOSED (TERM. 20 ENERGIZED)
SAFE START CHECK
TERMINAL 13 TO 12
TERMINAL
13 TO 15
TERMINAL
13 TO 15
TERMINAL 13 TO 14 TERMINAL 13 TO 14 TERMINAL 13 TO 14
TERMINAL 18
TERM. 10
TERM. 10
TERM. 21 ENERGIZED
TERMINAL 5 ENERGIZED (COMBUSTION AIR FAN)
TERMINAL 7 ENERGIZED (COMBUSTION AIRFLOW SWITCH)
TERMINAL 8 ENERGIZED (J2 INTACT)
TERMINAL 17 ENERGIZED TERMINAL 16 ENERGIZED
FLAME PROVING
TERMINAL 9
TERMINAL 8 ENERGIZED (J2 CUT) TERMINAL 8
MAIN
PILOT FLAME
POWER
MAIN
PILOT FLAME
POWER
MAIN
PILOT FLAME
POWER
MAIN
PILOT FLAME
POWER
MAIN
PILOT FLAME
POWER
MAIN
PILOT FLAME
POWER
MAIN
PILOT FLAME
POWER
MAIN
PILOT FLAME
POWER
MAIN
PILOT
FLAME
POWER
M9744
PILOT VALVE HOLD
2
4
1
2
WHEN CONFIGURATION JUMPER J3 IS CLIPPED, THE RM7838B AUTOMATICALLY CONTINUES INTO THE MFEP (NO WAITING TIME BETWEEN THE PFEP AND MFEP). ALARM (TERMINAL 3) IS DEENERGIZED AS SOON AS FLAME IS DETECTED.
3 4
NORMAL SHUTDOWN OCCURS WHEN TERMINAL 6 IS DEENERGIZED. THE RM7838B STARTS THE PILOT VALVE HOLD SEQUENCE WHEN TERMINAL 16 IS ENERGIZED. THE RM7838B REMAINS IN PILOT VALVE HOLD INDEFINITELY OR UNTIL TERMINAL 16 IS DE-ENERGIZED.
3
1
PFEPINITIATE PURGE MFEP RUN MFEP RUN
PILOT
VALVE
HOLD
(CLOSED)
PILOT
VALVE
HOLD
(CLOSED)
PILOT
VALVE
HOLD
(CLOSED)
PILOT
VALVE
HOLD
(CLOSED)
M. O. V. SWITCH CLOSED
LED DISPLAY
2010000000 00 00 45 55
10
J3 INTACT
BURNER
OPERATING CONTROLS AND INTERLOCKS
FLAME SIGNAL
FIRING RATE M OTOR
Fig. 22—Operation of the RM7838B Relay Module (operation including pilot valve hold).

Honeywell 7800 SERIES Specifications

General

Model	7800 SERIES
Category	Control Unit
Frequency	50/60 Hz
Approvals	UL, CE
Communication	Communication Interface (Optional)