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LR3D Technical Manual
Rev. IR (5/13/2020)
Step 4.
Select a suitable location to mount the low voltage warning light in your instrument
panel. An incandescent light has been included with the LR3D; however, an LED
indicator (user supplied) may be substituted, if desired. The warning light should be
positioned within the pilots' peripheral vision — generally, a 45-degree angle in front
of the pilot. A panel location away from direct sunlight is preferred.
Step 5.
Select a suitable panel location to mount the 2A and 5A circuit breakers. A panel
location within the pilot's field of vision and reach is recommended.
Step 6.
Select a suitable panel location to mount the alternator field switch. A panel location
immediately adjacent to the ship's battery master is recommended, if practicable.
Step 7.
Mount the LR3D to the firewall or selected location, terminal strip down. On a metal
firewall, AN4-4A bolts, AN960-416L flat washers, and AN365-428A locking nuts,
will be adequate to secure the regulator.
Step 8.
Wire the LR3D sense and field supply circuits using M22759/16 Tefzel wire and the
supplied S814R6 ring terminals, according to the wiring diagram on page E-1.
The LR3D senses bus voltage through terminal #3. If the low voltage
warning light is not desired, terminal #5 may be left unconnected; but
terminal #3 must still be connected to the bus through a fuse or circuit
breaker. If terminal #3 is not connected to power, the LR3D will not
work. "Jumpering" terminal #3 to terminal #6 is not recommended.
Step 9.
Wire the LR3D to ground using M22759/16 Tefzel wire and the supplied S814R6 ring
terminals, according to the wiring diagram on page E-1. Be certain to establish ground
connections to both terminal #7 and the threaded ground stud located below the
terminal strip.
This step is important for all airframes, and crucial for composite
aircraft. The LR3D obtains a redundant connection to ground through
the threaded stud. A jumper between terminal #7 and the ground stud
will compromise redundancy. Ground connections must be totally
independent and not rely on common fasteners. Select 18AWG wire
Step 10. Wire the 2A and 5A circuit breakers and alternator field switch using M22759/16
Tefzel wire, according to the wiring diagram on page E-1.
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Regulator Installation
(or larger) and ring terminals for these connections.
NOTE
NOTE
Section B
Installation
Page B - 2
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