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Honeywell C7076D Product Data page 11

Adjustable sensitivity ultraviolet flame detectors
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1
1/2 INCH NPT
CONDUIT SECTION
TO SEAL BOX
1
NOT MORE THAN 18 INCHES IN LENGTH.
Fig. 11. Mounting the C7076D Detector.
3. Detector leadwires can be spliced for longer leadwire
runs observing the following considerations:
a. Make required splices in a junction box.
b. Use moisture-resistant no. 14 wire suitable for at
least 167°F (75°C).
c. For High Temperature Installations, use Honeywell
specification no. 32004766-003 or equivalent for the
F leadwire. This wire is rated up to 480°F (250°C)
for continuous duty. It is tested for operation up to
20,000 volts and for breakdown up to 35,000 volts.
For the other leadwires, use moisture-resistant no.
14 wire selected for a temperature rating above the
maximum operating temperature.
d. F and G wires (blue and yellow) must be run in their
own conduit, independent of other power-carrying
leadwires. More than one scanner F and G wires
can be run in the same conduit.
e. A shielded twisted-pair wire may be substituted for
using conduit for routing the F leadwire (blue). Be
advised of the capacitance per foot of shielded wire
effectively reduces the flame signal at the flame
safeguard device. Be sure to ground the shield to
the G terminal at the flame safeguard wiring
subbase.
f.
The detector power and shutter wires need to be run
in their own conduit, as well, avoiding other
electrical noise-carrying wiring.
g. The scanner wires should remain separated 2 in.
(51 mm) minimum from other line voltage wires in
the main control panel to the flame safeguard
device.
4. Installation considerations to be avoided that can
influence detector operation and maximum leadwire
length:
a. Moisture.
b. Ignition interference.
c. High resistance connections and poor grounds.
d. Leadwire capacitance.
e. Voltage fluctuations.
f.
Induced line transients.
C7076A,D ADJUSTABLE SENSITIVITY ULTRAVIOLET FLAME DETECTORS
g. Floating grounds—ground at some voltage above
h. No G wire—burner used as ground.
i.
Wiring Diagrams
Follow approved system wiring diagrams. Refer to Fig. 12, 13,
14, or 15 for approved system wiring diagrams.
TERMINAL
BLOCK
FSP5075
TERMINALS
FLAME
DETECTOR
WIRES
M20756
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED. POWER SUPPLY MUST MATCH VOLTAGE
AND FREQUENCY RATING OF FLAME DETECTOR.
2 OPTIONAL SPST SWITCH FOR REMOTE SENSITIVITY SELECTION.
FLAME SAFEGUARD
CONTROL TERMINALS
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
2 OPTIONAL SPST SWITCH FOR REMOTE SENSITIVITY SELECTION.
Fig. 13. Wiring C7076A,D to flame safeguard control.
11
earth ground.
Detector output less than maximum attainable for
the installation (inadequate sighting).
C7076
TERMINALS
L1
1
L2
L2
2
3
SHUTTER
13
4
SHUTTER
5
G
7
6
F
Fig. 12. Wiring C7076A,D to FSP5075.
C7076
TERMINALS
1
L2
3
SHUTTER
X
4
SHUTTER
X
5
G
7
6
F
PROTECTION AS REQUIRED. POWER SUPPLY MUST MATCH VOLTAGE
AND FREQUENCY RATING OF FLAME DETECTOR.
L1
(HOT)
L2
1
SENSITIVITY
SELECTOR
2
SWITCH
B
A
M20757A
L1
(HOT)
L2
1
SENSITIVITY
SELECTOR
2
SWITCH
A
B
M20758A
95-8269—1

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