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Adjustments And Checkout - Honeywell C7061A Product Data

Dynamic self-check ultraviolet flame detector
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C7061A,F DYNAMIC SELF-CHECK ULTRAVIOLET FLAME DETECTOR
conduit type and diameter. The ultimate limiting factor in
flame signal leadwire length is the signal current. Refer
to Table 1.
3. The detector has color-coded plastic-insulated, no. 18
leadwires, 8 ft (2.4m) long, rated for 221°F (105°C).
These wires must be run in a conduit.
4. If the leadwires are not long enough to reach the terminal
strip or wiring subbase, make the required splices in a
junction box.
5. If splicing is necessary, use moisture-resistant no. 14
wire suitable for at least 167°F (75°C) if the detector is
used with a flame safeguard primary control, or at least
194°F (90°C) if used with a flame safeguard
programming control.
6. For high temperature installations, use Honeywell
specification no. R1298020 wire or equivalent for the F
leadwire. This wire is rated up to 400°F (204°C) for
continuous duty. It is tested for operation up to 600 volts
and for breakdown up to 7500 volts. For the other
leadwires, use moisture-resistant no. 14 wire selected for
a temperature rating above the maximum operating
temperature.
7. Refer to Fig. 10 for wiring connections.
IMPORTANT
Do not run the flame detector wiring in the same
conduit with high voltage ignition transformer wires.
Connecting Detectors in Parallel
For a flame that is difficult to sight, using two parallel C7061
Flame Detectors reduces nuisance shutdowns. If only one of
the parallel detectors loses the flame signal, the other indicates
the presence of the flame and keeps the burner running. When
two parallel C7061 Detectors are used, a flame-simulating
failure in either detector causes the burner to shut down. Two
C7061 Detectors can be connected in parallel to the same
terminals on 120 volt flame safeguard controls. To avoid
exceeding the rating of the solid-state shutter switch in the
R7861 Flame Signal Amplifier, do not connect more than two
C7061 Detectors in parallel.
When the flame detectors are connected in parallel, the low
level background signals are additive. Also, the background
signal increases as the temperature decreases. Because of
this, the minimum ambient operating temperature must be
increased from -40°F (-40°C) to -10°F (-23°C) when C7061
Flame Detectors are connected in parallel.
IMPORTANT
Voltage and frequency rating of the C7061A must
match the power supply of the flame safeguard
control.
ADJUSTMENTS AND
CHECKOUT
UV Sensor Tube Test
For initial burner lightoff, consult the burner manufacturer
instructions or the flame safeguard control instructions.
If the system does not start during the initial burner lightoff,
check the UV sensor tube in the flame detector. If a reddish
glow appears when there is no flame present, replace the UV
65-0223—07
sensing tube. When performing this test, make sure there are
no extraneous sources of ultraviolet radiation in the test area
(see Radiation Sources section).
Adjust Detector Sighting
With the flame detector installed and the burner running, adjust
the sighting position of the detector for optimum flame signal.
7800 SERIES
FLAME SAFEGUARD
CONTROL
TERMINAL STRIP
1
F
G
22
L2
WIRING MUST BE NEC CLASS 1.
C7061A,F
TERMINAL 1 – NOT USED
TERMINAL 2 – (F)
TERMINAL 3 – (G)
4
TERMINAL 4 – SHUTTER DRIVE
1
5
TERMINAL 5 – SHUTTER DRIVE
4
2
5
3
1 AN R7861 DYNAMIC SELF-CHECK AMPLIFIER MUST BE USED.
VOLTAGE AND FREQUENCY RATING OF THE C7061 MUST
2
MATCH THE POWER SUPPLY OF THE FLAME
SAFEGUARD CONTROL.
3
TWO C7061A,F DETECTORS CAN BE CONNECTED IN
PARALLEL TO THE SAME TERMINAL.
4
C7061A1038 AND C7061A1046 ONLY: KEYED CONNECTOR ALLOWS
CONNECTION IN ONLY ONE POSITION.
5
C7061A1038 ONLY: REFERENCE BRAD HARRISON™ 41310 TYPE CONNECTOR.
MATING CONNECTOR CAN BE BRAD HARRISON™ 41306N OR
41307N TYPE CONNECTOR.
Fig. 10. Wiring diagram for C7061A,F Detectors
with 7800 Series Flame Safeguard
controls with shutter drive circuitry.
It is suggested that a volt-ohm meter with a minimum
sensitivity of one megohm/volt and a zero to five or ten Vdc
scale be used for R7861 Amplifier flame signal measurements.
Measure the flame signal as illustrated in
Fig. 10. Be careful to make the proper connections of
positive (red) meter lead to positive (+) control jack and
negative (black) meter lead to negative (-) or (-Com) jack with
7800 Series controls. When the 7800 Series control has a
Keyboard Display Module, a zero to five Vdc voltage is
displayed on the module.
NOTES:
1.
The shutter operation causes fluctuations in the
voltage reading. Read the average stable reading,
disregarding the peaks.
2.
The flame signal must be steady (or stable as
described in note 1).
Move the detector and sight pipe around to sight the flame
from various positions and angles. Try to get a maximum
steady (or stable) reading on the meter that is above the
minimum acceptable voltage listed in Table 1.
8
2
3
C7061
BLUE
YELLOW
(S)
WHITE
(L2)
WHITE
TO CONTINUOUS
COMPONENT
FLAME
CHECKING
OUTPUT
PROTECTORELAY®
CONTROL (SEE
INSTALLATION)
INSTRUCTIONS.)
M10129C

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