Federal Signal 121X Instructions D'installation Et De Service page 5

or reassembling unit. Lubricated joints exposed for long periods of time
may attract small particles of dirt or other foreign materials.
Body and cover joints should be reassembled immediately.
2. Loosen the lens clip screw (1 to 3 turns) and rotate the clip 90 degrees. Remove
the lens to expose the lamp. To remove the 120 Vac lamp, unscrew the lamp
(turn it counterclockwise) to remove it from the socket. Remove the 24 Vdc
lamp by pushing it in, turning it counterclockwise 3 degrees, and then pulling
it out of the socket.
3. Replace the 120 Vac lamp with lamp Part No. K8444A173. Replace the 24 Vdc
lamp with lamp Part No. K8107A041.
4. Place the lens in position under the hold-down tabs (2). Rotate the clip into
place on the lip of lens and tighten the screw.
5. Reassemble the unit by threading glass dome assembly into the main housing
until tight.
B. Cleaning the Enclosure
Maintenance procedures sometime require fixtures to be
hosed down for good housekeeping. The circuit must be
turned OFF and the dome MUST be allowed to cool to
Fixture should be cleaned periodically to maintain maximum light output. Only
mild, non-abrasive cleaning agents should be used. F The glass dome should be
regularly inspected for scratches and chips, and, if damaged, must be replaced.
C. Cleaning the Reflector
Remove and replace the glass dome assembly dome in accordance with instruc-
tions in paragraph IV.A. To clean reflector, use a soft cloth and any liquid household
cleaner. DO NOT USE abrasive cleaners. Reassemble the light by threading the
glass dome assembly into the main housing until it is tight.
Periodic cleaning is important to prevent the accumulation of
dust and dirt, which will impair the light output of the fixture.
D. Lubrication
1. The threaded joint on the pendant mount should be well lubricated. If corro-
sive products have accumulated on explosion-proof joints and cannot readily be
removed with solvents, the parts should be discarded and replaced.
EXPLOSION HAZARD — Never use an abrasive material or file to
remove corrosive products from threaded surfaces. In extremely
corrosive locations, equipment should be periodically inspected
to guard against unusual deterioration and possible porosity,
since this may weaken the enclosure structurally.
ambient room temperature before cleaning.
NOTE
NOTE
WARNING
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