Honeywell EC7895A, RM7895A

7800 SERIES EC7895A, RM7895A RELAY MODULE

65-0205

Table 6. Sequence And Status Hold Information.

NOTE: Normal sequences are in bold type, while abnormal sequences are not in bold type.

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 EC7895 or 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 does 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.

INITIATE HOLD: (AC Line Dropout) The LED indicates the burner status, POWER, and that AC Line power has

momentarily dropped out. The burner sequence does not advance into

STANDBY until the AC line voltage stabilizes 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 does not advance into

STANDBY until the 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 does 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 is satisfied. If a demand is present for burner

operation, the burner sequence does not advance from STANDBY to

PURGE until the recycle limits close.

If the EC7895 or 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

does not advance to PREPURGE because a flame is detected as being

present. The sequence does not advance to PREPURGE until the flame

signal clears. If the flame signal does not clear within 40 seconds, the

RM7895 locks out.

STANDBY HOLD: T7 (Airflow Interlock) The LED indicates the burner status, POWER, and that the Air-flow Interlock

is closed. A demand is present for burner operation and the burner

sequence does not advance to PREPURGE until the Airflow 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.