Honeywell C7061A Product Data page 9

Measure the flame signal for the pilot alone, the main burner
flame alone, and both together (unless monitoring only the pilot
flame when using an intermittent pilot, or only the main burner
flame when using direct spark ignition). Also measure the
flame signal at low and high firing rates and while modulating
in between (as applicable). With the detector in its final
position, all required flame signals must be steady
(or stable) and as specified in Table 1. If you cannot obtain the
proper signal, refer to the Troubleshooting section.
Pilot Turndown Test
When the detector is used to prove a pilot flame before the
main fuel valve(s) can be opened, perform a Pilot Turndown
Test before welding the sight pipe into position. Follow the
procedures in the flame safeguard control instructions and in
the burner manufacturer instructions.
Ultraviolet Response Tests Ignition
Spark Response Test
Test to be sure that ignition spark is not actuating the flame
relay in the flame safeguard control.
Flame Detector Signal Amplifier
C7061A,F R7861 Dynamic
Self-Check
a
Shutter operation of the C7061A causes fluctuations in the voltage reading. Read the average stable voltage, disregarding the
peaks.
b
Shutter operates at 12 cycles per minute.
2. Start the burner and run through the Ignition period. Igni-
tion spark should occur, but the flame LED must
not light. The flame signal should not be greater than
0.25 Vdc.
3. If the flame relay does pull in, reposition the detector far-
ther from the spark, or relocate/resight the detector to
eliminate/reduce the detector response to reflected UV
radiation. It may be necessary 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 the flame signal values indicated in step 2.
Response to other Ultraviolet
Radiation Sources
Some sources of artificial light produce small amounts of
ultraviolet radiation. Under certain conditions, an ultraviolet
detector responds as if it is sensing a flame. Do not use an
artificial light source to check the response of an ultraviolet
flame detector. To check for proper detector operation, conduct
flame failure response tests under all operating conditions.
Table 1. Flame Signal.
Plug-in Flame
Flame Safeguard Control(s)
RM7800E,G,L,M; RM7823A;
RM7838A,B,C; EC7823A;
a,b
RM7840E,G,L,M; RM7890B;
EC7890B; RM7895A,B,C,D;
RM7896A,B,C,D; EC7895A,C;
EC/RM7885; EC7810; EC7820;
EC/RM7830; EC7850.
C7061A,F DYNAMIC SELF-CHECK ULTRAVIOLET FLAME DETECTOR
1. Close the pilot and main burner manual shutoff valves.
NEGATIVE (-)
METER LEAD
Fig. 11. Measuring voltage flame signal
1.25
Weld the Sight Pipe
When the flame signal is acceptable after all adjustments are
made, remove the detector and weld the sight pipe in its final
position. (If you are using a swivel mount, the pipe may be
already welded.) Then reinstall the detector.
Final Checkout
Before putting the burner into service, check out the installation
using the Checkout procedures in the Instructions for the
appropriate flame safeguard control. After completing the
Checkout, run the burner through at least one complete cycle
to verify correct operation.
IMPORTANT
Do not put the system into operation until all
Checkout tests in the Instructions for the appropriate
flame safeguard control and any others specified in
the burner installation instructions are satisfactorily
completed.
9
POSITIVE (+)
METER LEAD
ONE
MEGOHM/VOLT
METER
with 7800 Series controls.
a
Minimum
Acceptable Steady Maximum Expected
Voltage (Vdc) Voltage (Vdc)
5.0
M7382
65-0223—07