LiftMaster RSL12U RSL12U Installation Manual - Page 17

Power Wiring, Operator Power Source

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INSTALLATION STEP 6 continued... POWER WIRING 1. Turn off the AC power from the main power source circuit breaker. 2. Run the AC power wires to the operator. 3. Unplug the transformer. 4. Remove the junction box cover. 5. Run the AC power wires through the knockout in the bottom of the electrical box. 6. Connect the green wire to the earth ground rod and AC ground using a wire nut. NOTE: The earth ground rod can be grounded to the chassis. 7. Connect the white wire to NEUTRAL using a wire nut. 8. Connect the black wire to HOT using a wire nut. 9. Replace the junction box cover. Ensure the wires are not pinched. 10. Plug in the transformer. 11. Turn ON AC power to the operator. OPERATOR POWER SOURCE DIRECT PLUG-IN TRANSFORMER (120 VAC) Wire Gauge 14 1150 feet (351 m) Wire Gauge 12 1850 feet (564 m) Wire Gauge 10 2950 feet (899 m) OR EXTERNAL PLUG-IN TRANSFORMER (24 VAC) Wire Gauge 18 150 feet (46 m) Wire Gauge 16 250 feet (76 m) Wire Gauge 14 400 feet (122 m) Wire Gauge 12 600 feet (183 m) Wire Gauge 10 1,000 feet (305 m) NOTE: Use copper conductors ONLY. Junction Box Cover 16

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16
STEP 6 continued...
POWER WIRING
1. Turn off the AC power from the main power source circuit breaker.
2. Run the AC power wires to the operator.
3. Unplug the transformer.
4. Remove the junction box cover.
5.
Run the AC power wires through the knockout in the bottom of the
electrical box.
6.
Connect the green wire to the earth ground rod and AC ground using
a wire nut.
NOTE:
The earth ground rod can be grounded to the
chassis.
7. Connect the white wire to NEUTRAL using a wire nut.
8. Connect the black wire to HOT using a wire nut.
9. Replace the junction box cover. Ensure the wires are not pinched.
10. Plug in the transformer.
11. Turn ON AC power to the operator.
NOTE:
Use copper conductors ONLY.
Junction Box Cover
INSTALLATION
OPERATOR POWER SOURCE
DIRECT PLUG-IN TRANSFORMER (120 VAC)
Wire Gauge 14
1150 feet (351 m)
Wire Gauge 12
1850 feet (564 m)
Wire Gauge 10
2950 feet (899 m)
OR
EXTERNAL PLUG-IN TRANSFORMER (24 VAC)
Wire Gauge 18
150 feet (46 m)
Wire Gauge 16
250 feet (76 m)
Wire Gauge 14
400 feet (122 m)
Wire Gauge 12
600 feet (183 m)
Wire Gauge 10
1,000 feet (305 m)