Lens Replacement - Eaton L-852G Instruction Manual

First, remove and secure power to the light unit. Separate the Optical Assembly from the
outer ring by removing the two bolts. There are two pry slots in the optical housing to help
separate the optical assembly from the support ring. Disconnect the light unit lead from the
isolation transformer. Open the light unit and disconnect the LED wires as described in
Section 10.4. Remove the old gasket from the groove in the inner cover using a plastic (or
comparably soft) tool. Carefully clean the inner cover's gasket groove and the mating sealing
surface on the optical housing. Take care not to damage the sealing surfaces or the new gasket.
Coat the gasket with a thin layer of Dow Corning FS 1292 lubricating grease. Position the new
gasket in the center of the groove and press it into place. Torque the inner cover screws to 30 in-
lbs. Perform a pressure test as described in Section 10.10. Connect the light unit lead from the
isolation transformer. Clean the mounting flange area of the light base. Install the light unit into
the light base per Section 9.1.
10.6

Lens Replacement

The warranty is void if the screws holding the L852G optical housing to the
WARNING
If a 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. Refer to Table 1 to determine the appropriate lens
replacement for your light unit. REMOVE and SECURE power to the light unit. Separate the Optical
Assembly from the outer ring by removing the two bolts. There are two pry slots in the optical housing
to help separate the optical assembly from the support ring. Disconnect the fixture lead from the
isolation transformer. Turn the optical assembly upside down and remove the four screws holding the
inner cover to the light housing. Disconnect the power supply lead from the LED module. Remove the
two screws holding the light reflector and LED board to the block heat-sink. Carefully remove the LED
board with reflector attached and place aside in a clean location. Leave the heat-sink attached to the
optical housing. Remove the two lens retaining bracket screws from the optical housing. Remove the
lens-retaining bracket and discard the lens-retaining gasket. Firmly push the lens/boot assembly from the
outside of the optical housing; discard the old lens and boot. Thoroughly clean the lens opening with
denatured alcohol and allow it to dry. Inspect the lens opening for scratches or pits; a damaged lens
opening surface will not seal properly. Place the new lens boot over the replacement lens. 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 (from the inside of the fixture) and press it into place. Verify that the lens
boot is not pinched in the lens opening. Using the new lens retaining gasket, fasten the lens retaining
bracket to the optical housing. Torque the mounting screws to 25-30 in-lbs. Re-install the LED module
per Section 10.4. Connect the power supply lead to the LED module. Inspect the feed-thru terminal for
signs of corrosion. Replace feed-thru assembly per Section 10.7 if corrosion is found. Inspect/replace the
optical housing's O-ring gasket per Section 10.5. Assemble the inner cover onto the light housing.
Tighten the mounting screws to 30 in-lbs. Perform a pressure test as described in Section 10.10. Connect
Instruction Manual
PRO APF Series LED
Inset Runway Guard Light L-852G
WARNING:
inner cover are loosened or removed.
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