RM7895A RELAY MODULE
32-00122-01
22
Table 9. Sequence and Status Hold Information.
Sequence
Status
INITIATE
The LED indicates the burner status, POWER, which is a stabilization period
for the RM7895 to check for any fluctuations in ac line voltage inputs or
control input on power-up or during normal operation. The timing of the
INITIATE period is ten seconds before entering STANDBY.
If the RM7895 is in a HOLD status, the following conditions could exist:
INITIATE HOLD: (AC Frequency/Noise)
The LED indicates the burner status, POWER, and that it is waiting for excess
line noise to clear up. The burner sequence will not advance into STANDBY
until the excess line noise, which prevents sufficient reading of the line
voltage inputs, ceases or a line frequency error is corrected (perhaps caused
by using a 60 Hz device on a 50 Hz line, or vice versa—devices with a date
code of 9804 or earlier).
INITIATE HOLD: (AC Line Dropout)
The LED indicates the burner status, POWER, and that ac line power has
momentarily dropped out. The burner sequence will not advance into
STANDBY until the ac line voltage has stabilized throughout the INITIATE
sequence.
INITIATE HOLD: (AC Frequency)
The LED indicates the burner status, POWER, and that line frequency is faster
than the expected value. The burner sequence will not advance into STANDBY
until the ac line frequency returns to the proper value.
INITIATE HOLD: (Low Line Voltage)
The LED indicates the burner status, POWER, and that low line voltage has
occurred. The burner sequence will not advance into STANDBY until the line
voltage is at a sufficient level for proper operating parameters.
STANDBY
The LED indicates the burner status, POWER. The burner can be placed in
STANDBY by opening the burner switch or if the operating controller
indicates its set point has been satisfied. If a demand is present for burner
operation, the burner sequence will not advance from STANDBY to PURGE
until the recycle limits close.
If the RM7895 is in a HOLD status, the following conditions could exist:
STANDBY HOLD: F/G (Flame Detected)
The LEDs indicate the burner status, POWER and FLAME, and that a flame is
detected. A demand is present for burner operation. The burner sequence will
not advance to PREPURGE because a flame is detected as being present. The
sequence will not advance to REPURGE until the flame signal clears. If the
flame signal does not clear within 40 seconds, the RM7895 will lockout.
STANDBY HOLD: T7 (Airflow Interlock)
The LED indicate the burner status, POWER, and that the Airflow Interlock is
closed. A demand is present for burner operation and the burner sequence
will not advance to PREPURGE until the Airlock Interlock proves open.
PURGE
The LED indicates the burner status, POWER, and that it is the period of time
before ignition during which time the blower motor is running. The timing of
the PURGE period is selectable.
If the RM7895 is in a HOLD status, the following conditions could exist:
PURGE HOLD: F/G (Flame Detected)
The LEDs indicate the burner status, POWER and FLAME, and that a flame is
detected. The burner sequence will not advance through PREPURGE because
a flame is detected as being present. The sequence will hold waiting for the
flame signal to clear. If the time exceeds 30 seconds, the RM7895 will
lockout.
