Honeywell 7800 Series Manual page 35

TABLE 6—SEQUENCE AND STATUS HOLD MESSAGES (Continued)
Sequence
PILOT IGN
If the RM7840 is in a PILOT HOLD status, the following condition could exist:
PILOT HOLD: TEST (Run/Test Switch)
MAIN IGN
RUN
RUN
If the RM7840 is in a RUN HOLD status, the following condition could exist:
RUN LOWFIRE: TEST (Run/Test Switch)
POSTPURGE
RESET/ALARM TEST
Status
The LEDs indicate the burner status, POWER, PILOT and
FLAME, which is the period of time the RM7840 permits the
pilot valve to be open and the pilot flame to be established.
The LEDs indicate the burner status, POWER, PILOT and
FLAME, and the Run/Test Switch is in the TEST position.
The sequence will not continue until the Run/Test Switch is
placed in the RUN position.
The LEDs indicate the burner status, POWER, PILOT,
FLAME and MAIN, which is the period of time the RM7840
permits the main valve to be open and the main flame should
be established.
The LEDs indicate the burner status, POWER, FLAME and
MAIN, which is the period of time after the Ignition Trials
and before the operating controller set point is reached.
During this time, the burner is firing under control of the
firing rate control.
The LEDs indicate the burner status, POWER, PILOT,
FLAME and MAIN, which is the period of time after the
Ignition Trials and before the operating controller set point is
reached. During this time, the burner is firing under control of
the firing rate control.
The LEDs indicate the burner status, POWER, FLAME and
MAIN, and that the Run/Test Switch is in the TEST position.
The firing rate motor will drive to the Low Fire position.
Normal modulation or operation will not continue until the
Run/Test Switch is placed in the RUN position.
The LEDs indicate the burner status, POWER, which is the
period of time after the RUN period during which the blower
motor continues to run. The timing of the POSTPURGE
period is fifteen seconds.
The LED indicates the burner status, POWER and ALARM.
This condition indicates that the reset button is pressed. If it is
held for more than four seconds, the alarm output is ener-
gized. The alarm output will be de-energized when the reset
button is released.
35
RM7840E,G,L,M
TROUBLESHOOTING
65-0087—2