Fireye D30 Series, Manual

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TYPICAL SCANNER INSTALLATIONS
OPERATION — 45UV5 SELF-CHECKING UV SCANNER
Self-checking ultraviolet scanners should be used in applications where burner firing operation is
continuous or where the burner is on for long periods of time without recycling. In addition, ultra-
violet self-checking systems are mandatory in some locations.
The operation of this type of system consists of maintaining the flame scanning capability at all times
while also proving that the ultraviolet tube is firing properly. This is done periodically by mechani-
cally closing off the sight of the UV tube and checking to make sure that the flame signal goes away.
A shutter assembly in the 45UV5 scanner performs this function. The diagram below explains the
process further.
If the shutter assembly in the scanner fails, the tube is faulty, or there is insufficient power to the
scanner, the control will LOCKOUT. The ultraviolet tube is replaceable (P/N 4-314-1).
A lockout will result if a minimum signal is detected for three consecutive shutter closed periods.
Wiring — UV Scanners
To connect the scanner to the control, the UV1 and UV8A scanners are supplied with 36" or 72" of
flexible cable. The UV2 comes with 36" of flexible cable, to connect the scanner to the control. The
45UV5-1009 is supplied with four 72" lead wires. Install them in a suitable length of flexible armor
cable and connect it to the control. A conduit connector is supplied with the scanner. Connect black
wires (shutter) to terminals L1, L2; red wires (UV tube) to terminals S1, S2.
Use the following instructions if the scanner wiring must be extended. Scanner wires should be
installed in a separate conduit. The wires from several scanners may be installed in a common con-
duit.
The maximum UV signal from a flame
is found in the first one-third of the vis-
ible flame taken from the point where
the flame begins. The scanner sight
pipe should be aimed at this area.
DO NOT EXTEND
MORE THAN
HALF-WAY INTO
REFRACTORY
SCANNER
FORCED
CLEAN AIR
(FROM DISCHARGE
OF FAN)
METHODS OF COOLING SCANNER
INSULATING
TUBING
SEALING
UNION FORCED
AIR
EXTEND SIGHTING TUBE
6”(1524) OR 8”(2032)
DO NOT EXTEND MORE THAN
HALF-WAY INTO REFRACTORY
A
B
SELECT SCANNER LOCATION (A OR B) THAT GIVES THE
BEST VIEW OF THE PILOT FLAME.
SHUTTER OPEN
SHUTTER CLOSED
3.7 SEC.
0.4 SEC. TIME