Document UT-MT-0780_EN
Page 30 of 39
Edition 03/10/2015
Supersedes edition 03/11/2014
LED INSET THRESHOLD AND THRESHOLD WING BAR LIGHT L
RTH04
INSTRUCTION MANUAL FOR USE, INSTALLATION AND MAINTENANCE
Figure 19 - Prism Cleaning
4.4
PRISM REPLACEMENT
If the prism is damaged it must be replaced as described below.
It is highly recommended to do a complete overhaul of the fixture. Contact OCEM -
ENERGY TECHNOLOGY for any suggestion.
4.4.1
Removing the Prism
Remove the fixture from the base and open it following instructions of
“Removing
and Opening the Light Unit From the Base”
.
Clean out possible pieces of the old prism and all accumulated debris from the inside.
Unscrew the two screws HSCS M5x12 (Figure 20- n°6) and remove the mounting
plate (Figure 20 - n°5). Then remove the old prism and the gasket, carefully clean the
prism seat by scraping and taking care not to damage the relevant walls.
4.4.2
Installing the New Prism
Place a new gasket (Figure 20 - n°2) in the prism cavity on the dome, then position
and press by hand the prism (Figure 20 - n°3) in the relevant seat and place a new
gasket in the back side of the prism (Figure 20 - n°4).
Then fasten the mounting plate (Figure 20 – n°5) with the two relevant screws HSCS
M5x12 (Figure 20 - n°6); tightening torque is 2.5 Nm. Inspect all components inside
the fixture for damages or signs of corrosion. Replace all necessary components.
Close the light fixture following instructions of paragraph
“Closing the Fixture”,
“Leakage Test”
and
“Reinstalling the fixture”
.
