Cooper MODEL 4 LED STYLE III L-852T User manual

DOCUMENT 2529
REVISION E
September 17, 2009
Instruction Manual
Model 4 – LED
Style III
Taxiway Omni-directional Light (TOL)
L-852T
Pro-III In-pavement Omni-directional Fixture
Cooper Industries
Crouse-Hinds Division
Airport Lighting Products
1200 Kennedy Road
Windsor, CT 06095 Copyright © 2009 Cooper Technologies Company For Parts or Technical Service Call [phone]

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1Revisions
Revision Issue/Reissue
Letter Number Description Created/Updated Checked Approved
A A205-291 INITIAL RELEASE DAT KWF JMM
B A208-078
Added item 31 to Figure 5;
Parts List, added item 31 &
item 8 P/N was 10000-506 &
qty was 6 for 12 inch version;
8.5, added support ring to text
PG KWF 7/3/08
C A208-230
Parts list item 8 P/N was
10B06-019D32 PG KWF 1/20/09
D A209-037
Parts list item 8 P/N was
10000-518 & qty 12 for 12 inch
versions and deleted item 31,
P/N 21453, qty 1 and item 7
P/N was 21259; Figure 5,
deleted item 31
PG KWF 4/7/09
E A209-092
Parts list item 12 P/N was
21304-2 & item 13 P/N was
21304-2H; 6.1, FAA AC
150/5345-46D was -46C
PG KWF 9/17/09

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2Limited Product Warranty
THE FOLLOWING WARRANTY IS EXCLUSIVE AND IN LIEU OF ALL OTHER
WARRANTIES, WHETHER EXPRESS, IMPLIED OR STATUTORY, INCLUDING,
BUT NOT BY WAY OF LIMITATION, ANY WARRANTY OF
MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE.
Crouse-Hinds Airport Lighting Products (the “Company”) warrants to each original
Buyer of Products manufactured by the Company that such Products are, at the time of
delivery to the Buyer, free of material and workmanship defects, provided that no
warranty is made with respect to:
(a) any Product which has been repaired or altered in such a way, in Company’s
judgment, as to affect the Product adversely;
(b) any Product which has, in Company’s judgment, been subject to negligence, accident
or improper storage;
(c) any Product which has not been operated and maintained in accordance with normal
practice and in conformity with recommendations and published specification of
Company; and,
(d) any Products, component parts or accessories manufactured by others but supplied by
Company (any claims should be submitted directly to the manufacturer thereof).
Crouse-Hinds Airport Lighting Products’ obligation under this warranty is limited to use
of reasonable efforts to repair or, at its option, replace, during normal business hours, at
any authorized service facility of Company, any Products which in its judgment proved
not to be as warranted within the applicable warranty period. All costs of transportation
of Products claimed not to be as warranted and of repaired or replacement Products to or
from such service facility shall be borne by Purchaser. Company may require the return
of any Product claimed not to be as warranted to one of its facilities as designed by
Company, transportation prepaid by Purchaser, to establish a claim under this warranty.
The cost of labor for installing a repaired or replacement product shall be borne by
Purchaser. Replacement parts provided under the terms of this warranty are warranted
for the remainder of the warranty period of the Products upon which they are installed to
the same extent as if such parts were original components thereof. Warranty services
provided under the Agreement does not assure uninterrupted operations of Products;
Company does not assume any liability for damages caused by any delays involving
warranty service. The warranty period for the Products is 24 months from date of
shipment or 12 months from date of first use whichever occurs first.

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3Safety Notices
This equipment is normally used or connected to circuits that may employ voltages that are dangerous and
may be fatal if accidentally contacted by operating or maintenance personnel. Extreme caution should be
exercised when working with this equipment. While practical safety precautions have been incorporated in
this equipment, the following rules must be strictly observed:
3.1 Keep Away from Live Circuits
Operating and maintenance personnel must at all times observe all safety regulations. Do not perform
maintenance on internal components or re-lamp with power ON.
3.2 Resuscitation
Maintenance personnel should familiarize themselves with the technique for resuscitation found in widely
published manuals of first aid instructions.
IMPORTANT:
IMPORTANT See FAA Advisory Circular AC 150/5340-26 for additional information.

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4Table of Contents
Title Page i
1 Revisions ii
2 Limited Product Warranty iii
3 Safety Notices iv
4 Table of Contents v
5 Part Number Explanation 1
6 General Description 2
6.1 Taxiway Omni-directional Light, L-852T 2
7 Installation 2
8 Maintenance 3
8.1 Cleaning Lenses 3
8.2 Relamping 3
8.3 Power Supply Replacement 3
8.4 O-Ring Replacement 4
8.5 Lens Replacement 4
8.6 Feed-thru Replacement 5
8.7 Pressure Test 5
8.8 Cleanliness and Workmanship 5
8.9 Maintenance Program 5
9 Parts List 7
Figure 1 Top View of Fixture 8
Figure 2 Side View of Fixture 8
Figure 3 Feed-thru Adapter Detail 9
Figure 4 Bottom View of Fixture 9
Figure 5 Sectioned View of Fixture 10

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5Part Number Explanation – Taxiway Centerline Light, L-852T

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6General Description
6.1 Taxiway Omni-directional Light, L-852T
The Crouse-Hinds Taxiway Omni-directional Light is a Style 3, FAA L-852T per FAA AC 150/5345-46D.
It is designed for installation at the taxiway edge or any other location where visual guidance of moving
aircraft or ground vehicles is desirable. The fixture is designed to fit on a FAA L-868, steel, size B or FAA
L-867, steel, size B light bases per FAA AC 150/5345-42 (latest version), and have a total height above
grade/ground level of .250 inch. The fixture is omni-directional, projecting the beam of light 360° in the
horizontal direction. The light fixture consists of a 1-piece aluminum optical assembly. The aluminum
optical assembly is mounted to a light base with six bolts (3/8-16 UNC x 7/8 lg., stn. stl.) and lock washers
(3/8, stn. stl.). The aluminum housing has a die cast bottom cover that is attached using 4 screws. A o-ring
is used to provide a watertight seal between the inner cover and the optical housing. An LED module is
secured to the lens bracket, which is fastened to the optical housing. Electrical connections are made at one
feed-thru assembly in the inner cover. The feed-thru has an ITS verified L-823 plug for connecting to FAA
L-830/ L-831 Isolation Transformer. The outer lens is held into the aluminum housing with a bracket,
gaskets and 6 screws. All hardware is type 18-8 stainless steel except for the 6 screws holding the outer
lens bracket onto the aluminum housing, which are type 316 cold worked stainless steel. The complete light
unit is 11.94 inches in diameter, 5.13 inches deep, and weighs 10.5 lbs.
CAUTION:
CAUTION Never handle the light assembly by the leads as this can break the waterproof seal.
7Installation
The Style 3 TOL light units are shipped complete and are ready for installation as received. Installation of a
light unit is to be done with primary POWER OFF and SECURED. At each light location, install a steel,
Size B, 12 inch deep minimum, L-868 Light Base per FAA AC 150/5340-4 (latest revision). For TOL
fixtures, the fixture orientation is not a factor; however, it is recommended that all fixtures be installed in
the same way, “Crouse-Hinds” label on the aluminum housing towards the center of the taxiway. Place the
properly sized isolation transformer in the light base and make necessary primary power connections using
L-823 connectors. The TOL light unit requires a minimum 10/15W watt, 6.6A secondary transformer for
the standard fixture and a minimum 20/25 watt, 6.6A secondary transformer for the heater option fixture.
Verify that the mounting flange on the light base is clean and the o-ring (optional on deep cans) is coated
with Dow Corning FS 1292 grease and is in place on the light base. Connect the plug from the light unit to
the secondary of the previously installed isolation transformer. Installation tool, Crouse-Hinds P/N 19999,
will ease in the installation and removal of the light unit. The threaded eyebolts on the lifting tool screw
into threaded holes in the light fixture. Lower the light unit straight down onto the base. The light fixture is
subject to optical misalignment or mechanical damage if not seated properly. Secure the light fixture to the
base with six 3/8-16 UNC x 7/8 lg., stn. stl. bolts and lock-washers and tighten to 225 -0 +10 in-lbs. (18 ft-
lbs.). It is recommended that Loctite 242 be used on the mounting bolts to prevent loosening due to
vibration. Loctite is required for fixtures subjected to repeated aircraft impacts and roll-overs.
8Maintenance

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The preferred method of maintaining these lights is to periodically and systematically replace the units and
return it to the maintenance shop for renovation. As an alternative, the units can be serviced in the field.
However, it is recommended that field servicing be limited to cleaning the lens only as described in section
8.1.
8.1 Cleaning Lenses
With a compressed air blast or suitable brushes, remove all accumulated debris from the unit. Clean the
outer lens surface with a detergent solution. If the lens is coated with a substance impervious to the
detergent, a suitable solvent should be sparingly applied with a wad of cotton or a patch of cloth on the end
of a wood splint. After the solvent has acted the remaining solvent and softened coating should be removed
with a clean piece of cotton or cloth. Care should be taken to avoid excessive contact between the solvent
and the lens seal. Remove all remaining solvent from lens and seal. A gentle air blast may be used.
8.2 Relamping
LED Module Replacement Kit P/N 21334 contains all necessary parts to change the LED module.
Remove and secure power to the fixture.Turn the fixture upside down and remove the four screws
holding the inner cover to the light housing. Disconnect the LED module leads from the power supply. Remove
the lens retaining bracket screws from the light housing. Remove the lens-retaining bracket and remove the LED
module and thermal tape by unscrewing the screws. Install the new LED module and thermal tape by
reversing the procedure above and making sure that the screws are tightened to 25 - 30 in-lbs; tightening
the lens retaining bracket screws may cause damage. For the heater option fixture, make sure that the
heater wires are aligned with the slot on the lens retaining bracket so that they are not pinched.
Inspect/replace the optical housing’s o-ring per paragraph 8.4. Assemble the inner cover onto the light
housing. Assemble the inner cover onto the light housing. The screw-hole patterns in the inner cover and
light housing are offset to insure proper alignment. Torque the mounting screws to 25 - 30 in-lbs. Perform
a pressure test per paragraph 8.7. Clean the mounting flange area of the base. Place the fixture into the base.
Apply Loctite 242 (P/N 10048-30), per manufacturer’s instructions, to all mounting bolts and immediately
torque them to 225 - 235 in-lbs.
8.3 Power Supply Replacement
Remove and secure power to the fixture.Turn the fixture upside down and remove the four screws
holding the inner cover to the light housing. Disconnect the LED module leads from the power supply.
Disconnect the power supply leads from the feed-thru on a standard fixture or both the feed-thru and thermostat
on a heater option fixture. Remove the power supply bracket screws and remove the bracket, power supply, and
rubber isolator. Install a new power supply with the rubber isolator and bracket. Torque the power supply
bracket screws to 25 - 30 in-lbs. Inspect/replace the optical housing’s o-ring per paragraph 8.4. Assemble
the inner cover onto the light housing. The screw-hole patterns in the inner cover and light housing are
offset to insure proper alignment. Torque the mounting screws to 25 - 30 in-lbs. Perform a pressure test per
paragraph 8.7. Clean the mounting flange area of the base. Place the fixture into the base. Apply Loctite
242 (P/N 10048-30), per manufacturer’s instructions, to all mounting bolts and immediately torque them to
225 - 235 in-lbs.
8.4 O-Ring Replacement

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Every time the unit is opened, the o-ring must be closely examined and replaced, if necessary. Any o-ring
that is stretched, torn, has permanent set, or some other defect which would prevent it from forming a
watertight seal must be replaced with a new o-ring.
NOTICE:
NOTICE A bad o-ring seal is the most common cause of inset fixture leaks. It is strongly
recommended that a new o-ring be installed every time the Optical Assembly is opened
Remove the old o-ring from the groove in the optical housing. Carefully clean the o-ring groove and flange
mating surface on the inner cover. Take care not to damage the mating surface or the o-ring. Coat the o-ring
(P/N 10035-62) with a thin layer of Dow Corning FS 1292 Lubricating grease. Position the new o-ring in
the center of the groove and press it into place. Torque the inner cover screws to 25 - 30 in-lbs. Perform a
pressure test as described in paragraph 8.6. Clean the mounting flange area of the base. Place the fixture
into the base. Apply Loctite 242 (P/N 10048-30), per manufacturer’s instructions, to all mounting bolts and
immediately torque them to 225 - 235 in-lbs.
NOTICE:
NOTICE The groove is designed to be wider than the o-ring. This provides room for the
displacement of the o-ring when compressed between the housing and mating surface.
Properly tightened screws are important in obtaining a complete seal.
8.5 Lens/Heater Replacement
Outer Lens:
If an outer lens is broken, leaks, or is badly pitted or scarred, it must be replaced. It is highly recommended
that this task be performed in a clean shop environment. Outer Lens Replacement Kit P/N 21332 contains
all necessary parts to change a lens. Remove and secure power to the fixture.Turn the fixture
upside down and remove the four screws holding the inner cover to the light housing. Remove the lens retaining
bracket screws from the light housing. Remove the lens-retaining bracket and support ring and discard the lens-
retaining gasket. Firmly push the lens/boot assembly from the outside of the light housing; discard the old lens
and boot. Thoroughly clean the lens opening with isopropyl alcohol and let dry. Inspect the lens opening for
scratches or pits; a damaged lens opening surface will not seal properly. Place a new lens boot (P/N 21256)
over the replacement outer lens (P/N 21254). Apply a thin coat of Dow Corning FS 1292 grease over the
entire outside surface of the lens boot. Align the lens/boot assembly in the lens opening and press it into
place. Verify that the lens boot is not pinched in the lens opening. Using a new lens retaining gasket (P/N
21258), fasten the lens retaining bracket (P/N 21259) and support ring (P/N 21453) to the light housing.
Torque the mounting screws to 25 - 30 in-lbs; over tightening these screws may cause damage.
Inspect/replace the optical housing’s o-ring per paragraph 8.4. Assemble the inner cover onto the light
housing. The screw-hole patterns in the inner cover and light housing are offset to insure proper alignment.
Torque the mounting screws to 25 - 30 in-lbs. Perform a pressure test per paragraph 8.7. Clean the
mounting flange area of the base. Place the fixture into the base. Apply Loctite 242 (P/N 10048-30), per
manufacturer’s instructions, to all mounting bolts and immediately torque them to 225 - 235 in-lbs.

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Outer Lens with Heater:
Outer Lens/Heater Replacement Kit P/N 21333 contains all necessary parts to change a lens/heater
assembly. Do as stated above; however, this fixture will not have a lens retaining gasket since it is
incorporated into the heater assembly and make sure that when mounting the lens retaining bracket, the
heater wires are aligned with the slot on the lens retaining bracket so the wires are not pinched. The heater
must be unplugged from the thermostat prior to removing the lens/heater assembly.
8.6 Feed-thru Replacement
Remove and secure power to the fixture.Turn the fixture upside down and remove the four screws
holding the inner cover to the light housing. Disconnect the power supply leads from the feed-thru terminals.
Remove the feed-thru by unscrewing the retaining collar. Clean the mounting surfaces with Isopropyl Alcohol
and let dry. Apply a thin coat of Dow Corning FS 1292 grease to the mounting flange of a new feed-thru.
Apply a drop of Loctite 242 to the feed-thru adapter threads. Screw the feed-thru retaining collar onto the
adapter; refer to Figure 4 for proper inner cover/feed-thru orientation. Torque the retaining collar to 25 - 30 in-
lbs. Inspect/replace the optical housing’s o-ring per paragraph 8.4. Assemble the inner cover onto the light
housing. The screw-hole patterns in the inner cover and light housing are offset to insure proper alignment.
Torque the mounting screws to 25 - 30 in-lbs. Perform a pressure test per paragraph 8.7. Clean the
mounting flange area of the support ring. Place the Optical Assembly into the base. Apply Loctite 242 (P/N
10048-30), per manufacturer’s instructions, to all mounting bolts and immediately torque them to 225 -235
in-lbs.
8.7 Pressure Test
A light fixture should be subjected to a 20-psi air pressure test to verify that it is waterproof whenever it has
been opened or components have been replaced. A tire valve style pressure fitting is located on the bottom
of the inner cover. Pressurize the fixture to 20-psi then place it in a tub of water or use a soap solution to
locate escaping air bubbles. Carefully inspect the areas around the lens, inner cover seal, and feed-thru
adapter for leaks. Relieve the internal air pressure before installing the fixture or attempting to repair a leak.
WARNING:
WARNING Do not exceed 20-psi when pressure testing the fixture. Serious injury and/or
permanent damage to the fixture may result if a higher air pressure is used. Once
the pressure test is complete, be sure to relieve the air pressure.
8.8 Cleanliness and Workmanship
Service life depends upon the entire assembly being waterproof. All surfaces must be clean, dry and free of
all foreign matter if the light fixture is to operate for extended periods without requiring maintenance.
8.9 Maintenance Program
In order to insure maximum light fixture life, the installed units should be subject to a maintenance program in
accordance with the following:

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A daily operation check should be made of the lighting fixture. The lights should be energized and visually
inspected. If any fixtures are out, the location of the fixture should be recorded and the unit inspected at a time
when the circuit is de-energized. (See Section 8.2)
8.9.1 Regular cleaning is necessary in order to insure that inset lighting fixtures operate at maximum efficiency.
The lens should be cleaned periodically with a soft cloth and solvent. The weather and the location of the
fixtures will dictate the regularity and type of cleaning.
8.9.2 Snowplow operators should exercise extra care not to strike the light fixtures with snowplow blades (use
rubber blades for added protection to the fixture). After snowplow removal operations, inspect all light
fixtures to locate and replace if necessary, any damaged Light Assemblies. Passes over the light rows
should be made with a power broom only if practical. Snowplows must NOT traverse TOL fixtures unless
they have the blades lifted clear of the fixtures; doing so may cause severe damage to the fixtures.
Recommended snow removal techniques are described in AC 150/5200-23.
8.9.3 The light is designed to exclude both ground and surface water from entering. If the lights are not properly
maintained (i.e., bolts tightened and seals in good condition) water may enter the fixture. To prevent this
from occurring, it is recommended that each fixture be inspected for the presence of water at least once a
month. More frequent inspection is desirable during and following rainy seasons.
8.9.4 TOL fixtures hold-down bolts should be checked for proper torque (225 - 235 in-lbs.) at least once every
three months or whenever a fixture is serviced regardless of the season. Light fixtures in and around the
Touchdown Zone area are especially prone to vibration damage if the mounting bolts are not properly
torqued. The mounting surface of the light base must be clean and free of foreign matter when checking
mounting bolts.
8.9.5 If any fixture contains water, the water should be removed and the entire fixture cleaned and dried. Perform
a pressure test per paragraph 8.7 to locate the source of the leak. Replace the o-ring (100035-62), See
Section 8.4.

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STANDARD W/ HEATER STANDARD W/ HEATER STANDARD W/ HEATER
852T4-8 852T4-8-1 852T4-12A 852T4-12A-1 852T4-12B 852T4-12B-1
100111121273-XXX HOUSING, OPTICAL, 12-INCH
212000021253 HOUSING, OPTICAL, 8-INCH
311111110035-62 O-RING, 3/32 THK, 6.25 I.D., POLYURETHANE, 90 DUROMETER
411111121254 LENS, OUTER
511111121256 BOOT, LENS, OUTER
611111121258 GASKET, LENS RETAINING
711111121259-1 BRACKET, LENS RETAINING
866666610000-519 SCREW, BUTTON HD SOCKET CAP, #10-32 x 3/4 INCH LG, 316 STN STL, CW
911111121312 HEATSINK, LED ASSEMBLY
1011111121310 THERMAL TAPE
1122222210000-468 SCREW, SEMS, PAN HD TYPE 1A CROSS/DRI-LOC, #10-32x1/2 LG, SSTL
1210101021365-1T POWER SUPPLY, LED
1301010121365-3T POWER SUPPLY, LED, HEATER OPTION
1411111121320 BRACKET, LOCKING, POWER SUPPLY
1522222221314 ISOLATOR, POWER SUPPLY
1622222210B06-019D12 SCREW, PAN HD, #10-32 X 3/8 LG, STN STL
1711111121305 COVER, BOTTOM
1811111121120 ADAPTER, THREADED, FEED-THRU, ALUMINUM
1911111110035-61 O-RING
2011111121122 FEED-THRU ASS'Y, 1 LAMP/1 PLUG, ALUMINUM
2111111110000-471 SCREW, PAN HD TYPE 1A CROSS, GREEN, #10-32 x 3/8 LG, 18-8 SS
2211111110037-795 FITTING, PRESSURE TEST, 1/8 NPT
2344444410000-470 SCREW, 100° FLAT HD/DRI-LOC, #10-32 x 7/16 LG, 18-8 SS
2401010121325 HEATER ASSEMBLY
2502020210047-2880 CONNECTOR, PIGGY-BACK REC & TAB, 20-16 AWG, BRASS
2623233310046-95 WIRE, #16 AWG, STRANDED, 600V, BLACK TEFLON
2722222210047-2758 TERMINAL, FLAG, INSULATED, .250 x .032 TAB, 16-14 AWG
2822222210047-2868 CONNECTOR, RECEPTACLE INSULATED, #14-16 AWG
2901010110047-2943 THERMOSWITCH
3002020210033-81 RIVET, POP, 1/8 DIA, .265 LG, #SSD42SSBS
31
ITEM NO. PART NUMBER DESCRIPTION
9Parts List

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Figure 1: Top View of Fixture
Figure 2: Side View of Fixture

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Figure 3: Feed-thru Adapter Detail
Figure 4: Bottom View of Fixture

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Figure 5: Sectioned View of Fixture