LiftMaster 3900 3900PLD Manual - Page 13
Installation Step 8
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INSTALLATION STEP 8 Mount the Standby Power Unit (SPU) (Not Provided) If the optional 475LM Standby Power Unit is part of this installation it should be installed at this time. • The SPU can be mounted to either the ceiling or a wall within 3' (.9 m) of the motor unit. • Position the SPU as desired to a structural support (ceiling joist or wall stud). • Attach the SPU to the support using the mounting holes on either side of the SPU. • Secure the SPU using the 1-1/2" lag screws (2) provided with the SPU unit. • Connect the SPU cord into the connector on the bottom of the motor unit. • Follow all instructions included with the 475LM unit to test for proper operation and testing of the SPU. SPU Cord 475LM Standby Power System Connector 13
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13
INSTALLATION STEP 8
Mount the Standby Power Unit (SPU)
(Not Provided)
If the optional 475LM Standby Power Unit is part of this
installation it should be installed at this time.
•
The SPU can be mounted to either the ceiling or a wall
within 3' (.9 m) of the motor unit.
•
Position the SPU as desired to a structural support
(ceiling joist or wall stud).
•
Attach the SPU to the support using the mounting holes
on either side of the SPU.
•
Secure the SPU using the 1-1/2" lag screws (2) provided
with the SPU unit.
•
Connect the SPU cord into the connector on the bottom
of the motor unit.
•
Follow all instructions included with the 475LM unit to
test for proper operation and testing of the SPU.
SPU Cord
Connector
475LM Standby
Power System