Honeywell R7120M 7800 Serie Instructions D'installation page 16

R7120M 7800 SERIES RELAY MODULES
1. Close the pilot and main burner manual fuel shut-off valve(s).
2. Start the burner and use the Run/Test Switch (if avail-
able) to stop the sequence in the PILOT IGN period.
Ignition spark should occur, but the flame signal should
not be more than 0.5 Vdc.
3. If the flame signal is higher than 0.5 Vdc and the FLAME
LED does come on, consult the equipment operating
manual and resight the detector farther out from the
spark, or away from possible reflection. It may be neces-
sary to construct a barrier to block the ignition spark from
the detector view. Continue adjustments until the flame
signal due to ignition spark is less than 0.5 Vdc.
NOTE: The Honeywell Q624A and Q652B Solid State Spark
Generators prevent detection of ignition spark when
properly applied with C7027, C7035, C7044 or
C7061 Ultraviolet Flame Detectors. The Q624A and
Q652B are only for use with gas pilots.
Response To Other Ultraviolet Sources
Some sources of artificial light (such as incandescent or
fluorescent bulbs, mercury sodium vapor lamps and daylight)
produce small amounts of ultraviolet radiation. Under certain
conditions, an ultraviolet detector responds to these sources as
if it is sensing a flame. To check for proper detector operation,
check the Flame Failure Response Time (FFRT) and conduct
Safety Shutdown Tests under all operating conditions.
Flame Signal With Hot Combustion Chamber
(All Installations)
1. With all initial start-up tests and burner adjustments
completed, operate the burner until the combustion
chamber is at the maximum expected temperature.
2. Observe the equipment manufacturer warm-up instructions.
3. Recycle the burner under these hot conditions and
measure the flame signal. Check the pilot alone, the
main burner flame alone, and both together (unless
monitoring only the pilot flame when using an intermit-
tent pilot, or only the main burner flame when using
DSI). Check the signal at both High and Low Firing Rate
positions and while modulating, if applicable.
Check the FFRT of the flame amplifier and relay module.
4. Lower the setpoint of the operating controller and
observe the time it takes for the burner flame to go out.
This should be within the maximum FFRT.
5. If the flame signal is too low or unsteady, check the
flame detector temperature. Relocate the detector if the
temperature is too high.
6. If necessary, realign the sighting to obtain the proper
signal and response time.
7. If the response time is still too slow, replace the Plug-In
Flame Signal Amplifier.
8. If the detector is relocated or resighted, or the amplifier
is replaced, repeat all required Checkout tests.
SAFETY SHUTDOWN TESTS (ALL
INSTALLATIONS)
Perform these tests at the end of Checkout, after all other
tests are completed. If used, the external alarm should turn
on. Press the RESET pushbutton on the relay module to
restart the system.
66-1193EF—01
1. Detection of flame 240 seconds after entry to STANDBY
from RUN, fault code 9. Detection of flame from 10 sec-
onds up to 30 seconds into PREPURGE time.
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 from RUN and also simulate a
flame signal for 10 seconds to 30 seconds for
PREPURGE.
b. *Flame Detected* fault is displayed on the Keyboard
Display Module. Fault code 9 or 15 or 18 is displayed
to denote the fault.
c. Safety shutdown occurs.
2. Failure to ignite pilot.
a. Close pilot and main fuel manual shutoff valve(s).
b. Cycle burner on.
c. Automatic pilot valve(s) should be energized but the
pilot cannot ignite.
d. *Pilot Flame Fail* fault is displayed on the Keyboard
Display Module. Fault code 28 is displayed four or ten
seconds, depending on the jumper configuration
selection for Pilot Flame Establishing Period (PFEP)
after the pilot valve(s) is energized to denote the fault.
e. Safety shutdown occurs.
3. Failure to ignite main (only interrupted pilot application).
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
the FFRT of the amplifier and the relay module after
the interrupted pilot goes out.
f. *Main Flame Ign.* fault is displayed on the Key-
board Display Module. Fault code 19 is displayed to
denote the fault.
g. Safety shutdown occurs.
4. Loss of flame during RUN.
a. Open the main fuel manual shutoff valve(s) and
open 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. (On intermittent pilot applica-
tions, also, close the pilot manual shutoff valve.)
e. The flame signal should drop below 1.25 Vdc within
the FFRT of the amplifier and the relay module after
the main flame and/or pilot goes out.
f. *Main Flame Fail* fault is displayed on the Keyboard
Display Module. Fault code 17 is displayed to
denote the fault.
g. Safety shutdown occurs, or will recycle if jumper JR2
is intact, then lock out on failure to light the pilot.)
IMPORTANT
If the relay module fails to shut down on any of these
tests, take corrective action; refer to Troubleshooting
and the relay module diagnostics and return to the
beginning of all Checkout tests.
When all Checkout tests are completed, reset all switches to
the original status.
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