47 65-0120—1
TABLE 11—SELECTABLE MESSAGES (SEE TABLE 4) (Continued)
Selectable Message/ Possible States/Range
Display Description (Terminals) Comments
Ignition T10 Ignition. ON or OFF Indicates if output term-
inal is on (energized) or
off (de-energized.)
PV Hold T16 Pilot Valve Hold ON or OFF Indicates if RM7838B
is commanded to hold
in Pilot.
ManOpenSw T17 Manual Open Valve ON or OFF Indicates if Valve is at
Switch open position.
LowFire Sw T18 Low Fire Switch. ON or OFF Indicates if input is on
(energized) or off
(de-energized.)
HighFireSw T19 High Purge Rate Switch. ON or OFF Indicates if input is
(energized) or off
(de-energized.)
PreIgn ILK T20 Preignition Interlock. ON or OFF Indicates if input is on
(energized) or off
(de-energized.)
V2/Start T21 Start Switch Input. ON or OFF Indicates if Start Input is
present. This is momen-
tary input so RM7838B
could be in RUN and this
will read OFF.
Jumper 1 Pilot Flame INTACT/ Display shows state of
Establishing Period CLIPPED PFEP jumper. If jumper is
(PFEP). intact, the RM7838B will
have a 10 second PFEP;
if jumper is clipped,
RM7838B will have
4 second PFEP.
Jumper 2 Pilot Valve. INTACT/ Display shows state of
CLIPPED Pilot Valve . If jumper is
intact, RM7838B will
have Intermittent Pilot
Valve. If jumper is clipped,
RM7838B will have a
10 second Interrupted
Pilot Valve.
Jumper 3 Immediate or deferred INTACT Deferred/ Display shows state of
MFEP. CLIPPED Immed. Main Fuel Valve jumper.
If jumper is clipped,
RM7838B sequences
automatically to MFEP.
If jumper is intact,
MFEP is delayed until
Manual Open Valve
input is received.
Amp Type Defines type NORMAL/AMP- Display shows type of
of amplifier installed. CHECK/SHUTTER flame detection system
installed (i.e., NORMAL/
Standard, AMP-CHECK/
AMPLI-CHECK™, and
SHUTTER/Dynamic
Self-Checking).
RM7838B
TROUBLESHOOTING
(continued)