UV1AL-3 Flame Scanners
Owner’s Manual

SC-108
April 6, 2020
FIREYE
FLAME SCANNERS
UV non self-checking Scanner Models:
UV1AL-3, UV1AL-6, UV1AL-CEX

DESCRIPTION

The UV1AL, UV90L, UV1AL-CEX and UV5 scanners are used with the Burner PRO, MBCE and NXF4000 systems. The UV1AL-3/6 scanners come with 3 ft. or 6 ft. cables rated for Tray Cable – Exposed Run (TC-ER) and complies with the crush and impact requirements of the standard for metal  clad cable, UL 1569. The UV1AL-3/6 is  fitted with a 1/2” NPT threaded coupling. The UV90L-1/2 provides field wipeable terminal block. The UV5-1 and UV5-2 come with a 6.5ft UL rated cable for installation. The UV1AL-CEX is a UV1AL mounted in a ATEX compliant housing for environments requiring the rating of Ed IIC T6 ATEX hazardous location.
The UV90L Series Scanners are designed for front and lateral (90°) mounting which, in some applications allow the scanners to obtain a clearer view of the flame. The UV90L, with its exclusive snug fit mounting block, eliminates the need for a threaded sight pipe. The UV5 scanner also supports front and lateral viewing, but it’s highly  recommended for lateral viewing to maximize the UV tube’s sensitivity. The UV5-1 is shipped with a mounting flange and a detachable cable. The UV5-2 is shipped with a mounting flange and integrated cable.
The UV tube is made of quartz and is filled with a gas that ionizes when struck by UV radiation from the flame. In the absence of UV radiation, the gas acts as an insulator  between two electrodes which are mounted inside the tube. These electrodes are energized continuously by a high voltage. During combustion, UV radiation ionizes the gas,  causing current pulses to flow between the electrodes. These current pulses result in a flame signal which is transmitted to the amplifier in the control, where it is processed to energize or hold in the flame relay.

| WARNING: When installing or replacing UV scanners, a minimum pilot turndown test on pilot ignited burners and a spark pickup test on all burners must be performed.
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| WARNING: All installation, service and troubleshooting of Fir eye products must be performed by a qualified technician.

APPLICATION

The UV scanner is ideally suited for gaseous fuels (natural gas & propane). However, it can be used in detecting flames from standard fuel gases, some waste gases and light  oil fuels such as No. 2 oil. Flames from heavier oils can be detected with UV scanners but the unburned fuel shroud and/or atomization shroud can block passage of the UV  from the flame zone to the UV tube, causing nuisance burner/boiler trips. Infrared detection is recommended for fuel oil heavier than No. 2, and some installations where waste gases are burned together with natural gas as a main flame.
It should be noted that certain safety codes and regulations require the use of self-checking ultraviolet scanners. For information on self-checking UV scanners, refer to Bulletin SC-101.

SPECIFICATIONS

(specialty application – contact factory) Terminal block
UV5-1| 80” (2000mm) length, detachable cable
UV5-2| 80” (2000mm) length integrated cable

For scanner dimensions refer to Figures 2, 3 and 4.
Consult factory for custom lead lengths.

NOTICE: The information provided in this bulletin is directed to assist boiler and combustion service technicians who are experienced in the installation and operation of  Fir eye Flame Safety equipment. Persons not familiar with Fir eye products should contact the nearest Fir eye representative or other qualified service group. The UV1AL,  UV5, and UV90L, as well as all other Fir eye scanners, are designed to be used exclusively with the appropriate Fir eye Flame Safeguard and Burner  Management controls. The  application of these scanners to other than Fir eye equipment should be reviewed for approval by Fir eye.

APPLICATION REFERENCE

UV1AL, UV5 and UV90L-1 can be used only with the following FIREYE flame safeguard controls.

BP110UV series
BP230UV series
BP110UVFR series
BP230UVFR series| MBCE-110UV-x
MBCE-230UV-x| NXF4000
NXF4000-230V

The UV90L-2 is only approved for use with the M4RT1.

CAUTION: The UV1AL, UV5 and UV90L ultra-violet flame scanners are non- self checking UV systems and should be applied only to burners that cycle often (e.g.: a  minimum of once per 24 hours) in order for the safety checking circuit to be exercised.

TYPICAL SCANNER MOUNTING FOR UV1AL

MOUNTING DIMENSION FOR UV90L

FIGURE 3. UV1AL SCANNER OUTLINE DIMENSIONS

FIGURE 4. MOUNTING DIMENSION FOR UV5

Use two

8-32 PAN or M4 PAN screws to secure flange to mounting surface ![Fireye

UV1AL-3 Flame Scanners - Figure 5](https://manuals.plus/wp- content/uploads/2023/02/Fireye-UV1AL-3-Flame-Scanners-Figure-5.png)

ACCESSORIES

60-302
35-69
60-1257
60-1290| 1/2″ Swivel Union
Heat Insulator 1/2″ NPT threads each end, (male x female).
1/2″ NPT Union with quartz window
1/2″ NPT Union with quartz lens to increase sensitivity

INSTALLATION OF UV1AL, UV5, & UV90L SCANNERS

WARNING: THE LEADS FROM THE SCANNER TO THE CONTROL MUST BE SHIELDED TO PREVENT ELECTRICAL NOISE FROM GENERATING A  FALSE FLAME SIGNAL TO THE CONTROL.
Where possible, obtain the Burner Manufacturer’s Instructions for mounting the scanner. This information is available for most standard burners. The scanner mounting  should comply with the following general Instructions:

The following UL standards have been revised and now allow the use of TC-ER rated cable on Commercial boilers and burners:

• UL 295: Commercial – Industrial Gas Burners – Sections 10.1.6, 10.1.9, and 11.2.2.
• UL 296: Oil Burners – Sections 31.1.8, 31.1.11, and 32.2.2.
• UL 726: Oil fired Boiler Assemblies – Sections 15.1.6, 15.1.9, and 16.1.6.
• UL 795: Commercial – Industrial Gas Heating Equipment – Section 12.5.

1. The quartz UV tube is brittle. Care must be exercised to avoid dropping or otherwise striking the scanner with force. Keep the scanner protected until mounted.

2. Position the UV scanner within 36 inches of the flame to be monitored.

3. Select a scanner location that will remain within the ambient temperature limits of the UV Scanner. If cooling is required, use an insulating coupling (Fir eye P/N 35-69).

4. The UV Scanners are designed to seal off against pressures up to 1 PSI. To seal against higher pressures, install a union coupling with quartz window (P/N 60-1257).  Add cooling air to reduce the scanner sight pipe temperature. (Not applicable to UV90L and UV5).

5. Install the UV1AL scanner on a standard 1/2 inch NPS pipe whose position is rigidly fixed. If the scanner mounting pipe sights through the refractory, do not extend it  more than halfway through. Swivel flanges are available if desired (P/N 60-302). The sight pipe must permit an unobstructed view of the pilot and/or main flame, and  both pilot and main flames must completely cover the scanner field of view. Oil and gas flames radiate more ultraviolet energy from the base of the flame than from further out in the flame. This fact should be considered when installing the scanner sight pipe.

6. Since the radiated energy from an electric spark ignitor is very rich in the UV region, the field of view should be aimed so that it does not see an electric spark ignitor nor any reflector that is close to the spark.
   CAUTION: The unprotected leads must be run in electrical conduit in order to eliminate pickup of electrical noise which could present an unsafe condition.
   To prevent spark pickup by the UV detector, close and/or disconnect all pilot and main fuel valves.
   Operate the control through a burner startup cycle to determine that ignition spark cannot be detected.
   Burner will not ignite if spark is detected.

7. Avoid running the scanner cables or conduit in close proximity to hot surfaces at the burner.

8. Avoid running the scanner conduit in close proximity to high energy ignition wires.

9. Smoke or unburned combustion gases absorb ultraviolet radiation. On installations having negative pressure combustion chamber, a small hole drilled in the scanner  sight pipe will assist in keeping the pipe clean and free of smoke. For positive pressure furnaces, provide clean air to pressurize the sight pipe, if necessary.

10. Two UV Scanners may be installed on one burner if it is necessary to view two areas to obtain reliable detection of the flame. They should be wired in parallel.

11. To increase scanner sensitivity with the UV Scanners, a quartz lens permits location of the scanner at twice the normal distance. (Union w/quartz lens P/N 60-1290).

12. Request the assistance of any Fir eye Field Office for recommendations of a proper scanner installation on a non-standard application.

CAUTION: Ultra-violet tubes can simulate flame when exposed to high levels of “X” and GAMMA radiation. The table below indicates the maximum dose of radiation that  a UV tube can be exposed to safely.

Minimum Pilot Test
This test assures that the flame detector will not detect a pilot flame too small to reliably light off the main flame.
The test should be made on every new installation and following any repositioning of the flame detector.
THE MINIMUM PILOT TESTS MUST BE ACCOMPLISHED BY A TRAINED AND QUALIFIED BURNER TECHNICIAN.

SPARK REJECTION TEST
CAUTION: The scanner must not sight the ignition spark directly or any part of the burner that can reflect the spark back to the scanner. The scanner must not see a pilot   flame that is too small to reliably ignite the main flame. Test procedures vary according to the control used. See procedures as described in the technical bulletin for the  control being installed.
WIRING – UV SCANNERS
To connect the scanner to the control, the UV1AL Scanners are supplied with up to 72″ of flexible cable. Consult factory for custom lead lengths. The UV90L provides field  wipeable terminal block and the UV5 provides an 80” flexible cable.
Wiring Instructions:
Wire the black and red wires (18 AWG) on the UV1AL flame scanner to terminals S1 and S2 on the
Fir eye flame safeguard control. There is no polarity associated with the wire colors. Either wire (red or black) can be wired to either terminal (S1 or S2). UV5 cable is tagged  with S1 and S2 at the ends of the cable.
Shield and Drain Wire:
The UV1AL scanner provides a shield and drain wire that are internally bonded to the metal threaded 1 /2” NPT coupling nut. This allows a conduit clamp to provide an  electrical ground around the exposed shield when entering a metal junction box or control cabinet, or connect the drain wire to a suitable ground connection when using a  non-metallic (or metallic) junction box or control cabinet. For the UV1AL scanner, use shielded cable for the entire run. Attach shield to electrical ground at the control.
Conduit required:
On those applications where conduit is required for the scanner, Fir eye recommends the Thomas and Betts 449-TB (or suitable) fitting which is used to couple 3/8″ flexible  metal conduit to 1/2″ EMT conduit. The set screw on the fitting bites into the plastic on the scanner and seats onto the metal casing below, providing a secure connection.
If it is necessary to extend the scanner wiring, the following instructions apply:
Scanner wires should be installed in a separate conduit. The wires from several scanners may be installed in a common conduit.
NOTICE: The voltage applied to UV scanner is nominally 300 VDC with no flame present.

Selection of Wire

1. Use #14, 16, or 18 wire with 75 C, 600 volt insulation for up to 100 foot distances (signal loss approximately 20% at 100 feet).
2. For extended scanner wiring up to 500 feet, or for shorter lengths to reduce signal loss, use a shielded wire (Belden 8254, RG-62/U coaxial cable, or equal) for each scanner wire. The ends of the shielding must be taped and not grounded.
3. Asbestos insulated wire should be avoided.
4. Multiconductor cable is not recommended.
5. High voltage ignition wiring should not be installed in the same conduit with flame detector wires.

CAUTION: Keep scanner leads well clear of ignition high voltage wiring or any other high voltage or high current wiring in order to prevent false signal pickup in the scanner leads.
WARNING: Protective filtered lenses should be worn when viewing flame. Infrared and ultraviolet energy can be damaging to the eyes.

MAINTENANCE

Ultraviolet Scanners
The viewing area of the scanner must be kept clean. Even a small amount of contamination on the lens will reduce the flame signal reaching the detector by a measurable  amount. Wipe the viewing area routinely using a soft cloth dampened with concentrated detergent, then wipe dry.
Flame Signal Strength
Routine observation of the flame signal strength will forewarn any deterioration in the capability of the flame detector or its application.
Periodic Safety Check
It is recommended that a procedure be established to test the complete flame safeguard system at least once a month. This test should verify the proper operation of all limit  switches and safety interlocks as well as flame failure protection and fuel safety shutoff valve tightness.
Rotation
It is recommended that control and scanner units purchased as spares be installed periodically to ensure proper operation.

TROUBLESHOOTING NON SELF-CHECKING UV SCANNERS ZERO OR LOW FLAME SIGNAL

1. Zero volts at test jacks on control.
   — Make sure scanner has good view of the first
   1/3 of flame. Reposition scanner for best flame signal. If no signal …

2. Check for approximately 300 VDC across S1-S2 on control, with no flame present, as follows:
   — Use meter with 20k ohms/volt sensitivity.
   — Deenergize control.
   — Close and secure all fuel valves.
   — Energize control and measure voltage across S1-S2.

3. If voltage across S1-S2 is acceptable …
   — With control energized, remove scanner from burner and bring it to within a few inches of a
   UV source such as a gas lighter or propane torch.
   — Check for flame signal at control.

4. If no flame signal …
   — Make sure scanner lens is clean and dry.
   — Deenergize control and check continuity of leads between scanner and control.
   — Replace scanner
   — Replace amplifier or control.

5. If voltage across S1-S2 is low, check L1-L2 for proper line voltage. If line voltage is good:
   — Deenergized control, remove scanner lead wires from terminals S1 and S2.
   — Energize control and recheck for proper voltage across S1 and S2.
   — If voltage across S1 and S2 is good, replace scanner or lead wires.
   — If voltage across S1 and S2 is low, replace amplifier or control.

FALSE FLAME SIGNAL

1. Control will not start burner.
   — Check control wiring, all limits and interlocks.
   — Verify flame signal at test jacks upon energizing control.

2. Flame signal appears at test jacks when no flame is in combustion chamber.
   — Deenergize control to remove scanner leads from S1-S2.
   — Close and secure all fuel valves.
   — Energize control.
   — Check for induced voltage pickup to amplifier.

3. Burner starts up with scanner removed from S1-S2.
   — Deenergize control and connect scanner to S1-S2.
   — Energize control.
   — Check scanner for runaway condition. Look for a blue glow in the UV tube.
   — If glow is present, replace scanner.
   — If no glow is present, check to see that scanner leads are well clear of ignition or other noise carrying lines.

4. Burner does not start up even with scanner removed from S1-S2.
   — Check control wiring, all limits and interlocks.
   — Replace control/amplifier.

WARNING: The leads from the UV1AL, UV90L, or UV5 Scanners to the control must be shielded to prevent electrical noise from generating a false flame signal to the control.

Wiring the UV90L Scanner
Wiring the UV90L scanner is very easy. Remove the rear back shell by undoing the 2 screws (see image below). The terminal block can be accessed with the back shell removed. Use a shielded 2conductor cable to provide connectivity between the scanner and the control. It is recommended that the cable shield be tied to earth ground at the control. The terminal block is designed  to accept a conductor of 14 – 26 AWG. Strip back the conductor insulation to about 0.25inch  and feed the wire into terminal block opening. Torque down the retention screw sufficiently to secure the conductor.
Use the included strain relief to secure the cable to the scanner housing (as shown in image B below). Re-attach the back shell to complete the assembly.

NOTICE
When Fir eye products are combined with equipment manufactured by others and/or integrated into systems designed or manufactured by others, the Fir eye warranty, as  stated in its General Terms and Conditions of Sale, pertains only to the Fir eye products and not to any other equipment or to the combined system or its overall performance.

WARRANTIES
FIREYE guarantees for one year from the date of installation or 18 months from date of manufacture of its products to replace, or, at its option, to repair any product or part  thereof (except lamps, electronic tubes and photocells) which is found defective in material or workmanship or which otherwise fails to conform to the description of  the product on the face of its sales order. THE FOREGOING IS IN LIEU OF ALL OTHER WARRANTIES AND FIREYE MAKES NO WARRANTY OF MERCHANTABILITY OR ANY OTHER WARRANTY, EXPRESS OR IMPLIED. Except as specifically stated in these general terms and conditions of sale, remedies with respect to any product or part number manufactured or sold by Fir eye shall be limited exclusively to the right to replacement or repair as above provided. In no event  shall Fir eye be liable for consequential or special damages of any nature that may arise in connection with such product or part.

FIREYE
3 Manchester Road
Derry, New Hampshire 03038 USA
SC-108
April 6, 2020
supersedes June 12, 2018

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