Honeywell 7800 Series Installation Instructions Manual page 20

RM7838B,C 7800 SERIES RELAY MODULE
Keyboard Display Module
The KDM (see Fig. 8) is provided with the RM7838B,C
Relay Module. The first line of the Vacuum Fluorescent
Display (VFD) provides:
LED
DISPLAY
INITIATE
POWER
POWER
PILOT
FLAME
MAIN
ALARM ALARM
1
10 SEC
STANDBY
INITIATE
(INDEFINITE)
BURNER
OPERATING
CONTROLS
AND
INTERLOCKS
FLAME
SIGNAL
FIRING
TERMINAL 13 TO 14
RATE
MOTOR
1 ALARM IS OFF FOR RM7838C.
2 WHEN CONFIGURATION JUMPER J3 IS CLIPPED, THE RM7838B/C AUTOMATICALLY CONTINUES INTO THE MFEP (NO WAITING TIME BETWEEN THE PFEP AND MFEP).
T17 MUST CLOSE WITHIN 10 SECONDS.
ALARM (TERMINAL 3) IS DE-ENERGIZED AS SOON AS FLAME IS DETECTED (RM7838B ONLY).
3
4 NORMAL SHUTDOWN OCCURS WHEN TERMINAL 6 IS DE-ENERGIZED.
5
15 SECONDS FOR RM7838C.
Fig. 8. RM7838B,C Relay Module operation (not using pilot valve hold); see Fig. 9 for the
32-00199—01
00 00
PURGE
POWER
ALARM
1
PURGE
DRIVE
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
RM7838C1020/RM7838C2020.
a. Current status of the burner sequence
(STANDBY, PURGE, PILOT IGN, MAIN IGN and
RUN).
b. Timing information (PURGE, PILOT IGN and
MAIN IGN) in minutes and seconds.
c. Hold information (PURGE HOLD).
d. Lockout information (Lockout, Fault Code, Mes-
sage and Sequence).
00
START PFEP
POWER
ALARM
1
PFEP
DRIVE 5 HOLD
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
20
10 20
MFEP RUN
POWER
POWER POWER
PILOT
PILOT PILOT
FLAME FLAME FLAME
MAIN
MAIN MAIN
5
10 SEC
2 MFEP NORMAL
HOLD
(INDEFINITE)
BURNER
RUN
J3 INTACT
3
(IGNITION)
(INTERRUPTED
TERMINAL 17
TERMINAL 9
FLAME PROVING
TERMINAL
13 TO 15
M9745E
00
4
(INTER-
MITTENT
PILOT)
PILOT)
(STARTS
MFEP)
(MAIN
VALVE)