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Honeywell C7076D Product Data page 12

Adjustable sensitivity ultraviolet flame detectors
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C7076A,D ADJUSTABLE SENSITIVITY ULTRAVIOLET FLAME DETECTORS
EXTERNAL
SELECTOR
SWITCH
A
B
6 F
G
5
4
SHUTTER
L1
SHUTTER
L2
C7076A1031 OR
C7076D1043,
220/240 VAC, 50/60 HZ
2
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
2
CA UTION: PREVENT POSSIBLE DAMAGE TO SHUTTER MECHANISM.
ON EC7800 SERIES RELAY MODULE APPLICATIONS ONLY.
INSTALL A 200/220/240 VAC TO 120 VAC, 10VA MINIMUM STEP-DOWN
TRANSFORMER (NOT PROVIDED) TO DRIVE THE SHUTTER.
3
OPTIONAL SPST SWITCH FOR REMOTE SENSITIVITY SELECTION.
Fig. 14. Wiring C7076A,D to EC78XX Wiring
Subbase at 220/240 Vac, 50/60 Hz.
Remote System Sensitivity
For systems firing more than one fuel, each with a different
level of UV emission, or whose flame patterns change with
firing rate, two sensitivity adjustments are provided. An
external selector switch (spst) is required to choose between
the two sensitivity settings. (Refer to Sensitivity Adjustments
in the Adjustments and Checkout section.) With the external
selector switch open, the A sensitivity control setting will
determine the sensitivity of the detector; with the switch
closed, the B setting will determine the sensitivity. For
automatic sensitivity selection, the switch may be
incorporated into the fuel selector switch or the firing rate
switch.
Connecting Detectors in Parallel
Two C7076A or two C7076D Flame Detectors with the same
voltage rating can be connected in parallel to the same
terminals. To avoid exceeding the rating of the shutter control
circuit, do not connect more than two detectors in parallel.
95-8269—1
3
7
MASTER
SWITCH
L1
8
(HOT)
L2
1
2
F
Q7800
WIRING SUBBASE
22
G
L2
M20759A
6 F
G
5
4
SHUTTER
1
SHUTTER
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
2
OPTIONAL SPST SWITCH FOR REMOTE SENSITIVITY SELECTION.
Fig. 15. Wiring 120 Vac C7076A,D to RM78XX wiring
Making the Connection
1. Provide access to the terminal block in the detector as
follows:
a. For the C7076A, swing open the detector from the
faceplate. Loosen the four captive screws that
secure the cover plate (with the viewing lens) to the
detector, and remove the plate to provide access to
the terminal block.
b. For the C7076D, remove the four screws that
secure the faceplate (attached to the sight pipe) to
the detector. Force the faceplate from the housing
far enough to allow the detector to be sufficiently
reoriented on the conduit to provide access to the
terminal block.
2. Run the wires from the flame safeguard control through
the conduit to the C7076A or C7076D detector.
3. Connect each wire to the proper terminal on the
terminal block in the detector.
4. Reassemble the detector by performing step 1a or 1b
above, as applicable, in the reverse order.
12
EXTERNAL
SELECTOR
SWITCH
2
A
B
7
MASTER
SWITCH
8
L1
1
L2
2
F
WIRING SUBBASE
22
G
subbase.
L1
(HOT)
L2
1
Q7800
L2
M20760

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