Honeywell 7800 Series Manual page 31

a. Simulate a flame to cause the flame signal voltage
level to be at least 1.25 Vdc for 40 seconds after
entry to STANDBY and also simulate a flame
signal for 10 seconds for RM7840E,L and 30
seconds for RM7840G,M during PREPURGE.
b. Safety shutdown will occur.
4. Failure to ignite pilot.
a. Close the pilot and main fuel manual shutoff valve(s).
b. Depress the reset button.
c. Start the system.
d. The automatic pilot valve(s) should be energized
but the pilot cannot ignite.
e. Safety shutdown will occur.
5. Failure to ignite main.
a. Open the manual pilot valve(s); leave the main fuel
manual shutoff valve(s) closed.
b. Depress the reset button.
c. Start the system.
d. The pilot should ignite and the flame signal should
be at least 1.25 Vdc but the main burner cannot
light.
e. The flame signal should drop below 1.25 Vdc
within .8 or 3 seconds (depending on the FFRT of
the amplifier) after the interrupted pilot goes out.
f. Safety shutdown will occur.
6. Loss of flame during RUN.
a. Open the main fuel manual shutoff valve(s) and
open the manual pilot shutoff valve(s).
b. Depress the reset button.
c. Start the system. Start-up should be normal and the
main burner should light normally.
d. After the sequence is in the normal RUN period for
at least ten seconds with the main burner firing,
close the manual main fuel shutoff valve(s) to
extinguish the main burner flame.
e. The flame signal should drop below 1.25 Vdc
within .8 or 3 seconds after the main flame goes out.
f. Safety shutdown will occur (depending on the
FFRT of the amplifier).
7. Opening a Preigniton Interlock after the first five
seconds of POSTPURGE. (Safety shutdown will occur.)
IMPORTANT:
1. If the RM7840 fails to shut down on any of these tests,
take corrective action; refer to Troubleshooting and
the RM7840 diagnostics and return to the beginning of
all Checkout tests.
2. When all Checkout tests have been completed, reset all
switches to original states.
31
RM7840E,G,L,M
CHECKOUT
65-0087—2