Honeywell 7800 Series Manual page 21

Fig. 20—LED sequence status display information.
BURNER SEQUENCE:
STANDBY
HOLD: F/G
(FLAME
DETECTED)
INITIATE STANDBY
POWER
POWER
POWER
PILOT
PILOT
PILOT
FLAME
FLAME
FLAME
MAIN
MAIN
MAIN
ALARM
ALARM
ALARM
NOTE: SEE TABLE 6 FOR FURTHER DETAILS OF HOLD CONDITIONS.
Fig. 21—Relay Module and sequence status
LEDs (Fig. 20).
RUN/TEST SWITCH
SEQUENCE
STATUS LEDs
RESET PUSH
BUTTON
FLAME
SIMULATOR INPUT
RUN/TEST SWITCH FUNCTIONS
The Run/Test Switch is located on the top side of the
RM7840, see Fig. 21. The Run/Test Switch allows the burner
sequence to be altered as follows:
1. In Prepurge Drive To High Fire position, the Run/Test
Switch when placed in the TEST position, holds in
PREPURGE with the firing rate motor in the High Fire
position.
2. In the measured PREPURGE sequence, the Run/Test
Switch, when placed in the TEST position, causes the
PREPURGE timing to stop. The firing rate motor is in the
High Fire position.
3. In Prepurge Drive to Low Fire position, the Run/Test
Switch, when placed in the TEST position, holds the burner
Jumper
Number Description
JR1 Pilot Flame Establishing Period (PFEP)
b
JR2 Pilot Valve
JR3 Start-up Interlock (ILK) Check
a
A 30 second MFEP can be accomplished by adding a jumper wire between terminals 19 and 5.
b
Pilot Valve/First Stage Oil Valve (Valv/Start) Terminal 21.
PURGE
HOLD: F/G
(FLAME PILOT
DETECTED) PURGE IGNITION
POWER POWER POWER
PILOT
PILOT PILOT
FLAME FLAME FLAME
MAIN MAIN MAIN
ALARM ALARM ALARM
CAPTIVE
MOUNTING
SCREW
PLUG-IN PURGE
CARD
DUST COVER
RELAY MODULE
FLAME CURRENT
TEST JACKS
FLAME AMPLIFIER
M7778
TABLE 3—SITE CONFIGURABLE JUMPER OPTIONS.
(MFEP)
RUN (WITH
RUN WITH
INTERRUP-
MAIN
(INTERMIT-
TED PILOT)
IGNITION
TENT PILOT)
POWER POWER POWER
PILOT PILOT PILOT
FLAME FLAME FLAME
MAIN MAIN MAIN
ALARM ALARM ALARM
sequence in PREPURGE with the firing rate motor in the
Low Fire position.
4. In PFEP, the Run/Test Switch, when placed in the
TEST position, will stop the timer during the first eight
seconds when a ten second PFEP is selected, or during the
first three seconds when a four second PFEP is selected,
allows for pilot-turn-down test and other burner adjustments.
This activates a fifteen second flameout timer that permits
pilot flame adjustment without nuisance safety shutdowns.
The Run/Test Switch is ignored during PFEP for the
RM7840E,L if terminals 8 and 9 or 9 and 21 are jumpered.
5. During RUN, the Run/Test Switch, when placed in the
TEST position, drives the firing rate motor to the Low Fire
position.
NOTE: When the RM7840 is switched to the TEST mode, it
stops and holds at the next Run/Test Switch point in the
operating sequence. Make sure that the RUN/TEST
SWITCH is in the RUN position before leaving the
installation.
!
WARNING
Do not use the Run/Test Switch during the Pilot
Flame Establishing Period for the RM7840G,M
when using direct spark ignition.
SELECTABLE SITE-CONFIGURABLE JUMPERS
The RM7840 has three site-configurable jumper options,
see Fig. 22 and Table 3. The site-configurable jumpers should
be clipped with side cutters and the resistors removed from
the Relay Module.
Intact Clipped
10 seconds 4 seconds
Intermittent 15 or 30 seconds Interrupted
Disable Enable
21
RM7840E,G,L,M
OPERATION
RESET/
ALARM
TEST
POSTPURGE STANDBY
POWER POWER POWER
PILOT PILOT PILOT
FLAME FLAME FLAME
MAIN MAIN MAIN
ALARM ALARM ALARM
M3359
RM7840 Type
ALL
a
RM7840G
ALL
65-0087—2