Document UT-MT-0573
Page 22 of 28
Edition 03/13/2012
Supersedes edition 02/09/2010
SLTH – SEMI-FLUSH THRESHOLD LIGHT
INSTRUCTION MANUAL FOR USE, INSTALLATION AND MAINTENANCE
remove the filter assembly (fig.1 - n°8,9) unscrewi ng the relevant screws BHC
M5x10 (fig.1 - n°10)
clean the prisms surfaces with non abrasive glass product
dry them carefully
reassembly the light unit
Final check before fixture re-assembling.
Verify the correct position of O-Ring between dome and lower cover (fig.1 - n°20).
Mount the lower cover on the dome and fasten it by means the three screws HSCH M5x16
(fig.1 - n°22); tightening torque is 2.5 Nm.
Verify that:
•
the O-Ring around the dome (fig.1 – n°19) is right placed on the relevant groove;
•
the O-Ring between fixture and shallow base (fig.7 – n°7) is right placed on the
relevant groove.
The fixture is ready to be field installed.
5.3.
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 for any
suggestion.
5.3.1. Removing the prism
Remove the fixture from the base and open the fixture, as described at paragraph 4.1.
Clean out possible pieces of the old prism and all accumulated debris from the inside.
Remove the filter assembly (fig.1 - n°8,9) unscrewi ng the relevant screws BHC M5x10
(fig.1 - n°10); unscrew the three screws FHCS M5x12 (fig.1 - n°7) and remove the
mounting plate (fig.1 - n°6). Then remove the old p rism and the gasket, carefully clean the
prism seat by scraping and taking care not to damage the relevant walls.
5.3.2. Installing the new prism
Place a new gasket (fig.1 - n°4) in the prism cavit y on the dome, then position and press
by hand the prism (fig.1 - n°3) in the relevant sea t and place a new prism nylon gasket in
the back side of the prism (fig.1 - n°5).
Then fasten the mounting plate (fig.1 – n°6) with t he three relevant screws FHCS M5x12
(fig.1 - n°7); tightening torque is 2.5 Nm. Inspect all components inside the fixture for
damages or signs of corrosion. Replace all necessary components.
Reassembly the fixture following instructions of par 4.2.
5.3.3. Pressure test
The assembly should be given a 1.38 kPa air pressure test. This can be done by
connecting an external air pressure line to the valve (fig.5/6 – n°7) provided on the lower
