Honeywell 7800 Series Installation Instructions Manual page 24

RM7888A 7800 SERIES RELAY MODULE
Normal sequence is used when the application requires
the burner flame to be modulated during the Run state.
DSI State Name
Normal—Part 1 (Main Flame
Establishing Period [MFEP])
Normal—Part 2 (Main Flame
Establishing Period [MFEP])
Normal—Part 3 (Run)
High/Low Stepfire—Part 1 (Main
Flame Establishing Period
[MFEP])
High/Low Stepfire—Part 2 (Run) RUN
Run—High
OFF/ON Stepfire—Part 1 (Main
Flame Establishing Period
[MFEP])
OFF/ON Stepfire—Part 2 (Run)
32-00214—01
Table 9. DSI Configuration Operation Sequence States.
Displayed
Text
MAIN IGN Establish a Low Fire flame. Display shows elapsed time for Normal—
00:ss Part 1.
MAIN IGN Allow for main valve operators to be placed into the normal operating
00:ss condition while at Low Fire position. Display shows elapsed time for
Normal—Part 2.
RUN Allow normal operation to take place where a modulating control
provides the motor position signal.
MAIN IGN Establish a Low Fire flame. Display shows elapsed time.
00:ss
Run with Low Fire flame while commanding Low Fire for an indefinite
time period. When the appropriate special function signals are present,
the sequence will advance into the HI (Run at High Fire) state.
RUN Run with a High Fire flame for an indefinite period. From this state, the
sequence can return to the Low Fire state upon command without
recycling. Commanded output state is the same as Normal—Part 3, but
special function signals are different.
MAIN IGN Establish a Low Fire flame. Display shows elapsed time.
00:ss
RUN Run with a high fire flame for an indefinite period. Commanded output
state is the same as Normal Part 3 but special function signals are
different.
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Purpose