Chamberlain LA500DC Installation Manual page 23

STEP 8 continued...
POWER WIRING
LARGE METAL CONTROL BOX
To use solar panels with the Large Metal Control Box (Model XLSOLARCONTU) skip the steps below and refer to the Solar Panels section in the
Appendix.
1. Unplug the J15 plug labeled BATT(-)(+) DC(-)(+) on the control board by squeezing the plug and pulling it from the control board.
2. Turn off the AC power from the main power source circuit breaker.
3. Run the AC power wires to the control box.
4. Remove the toroid assembly from the control box by loosening the three screws and lifting the assembly up and out.
5. Ensure the 120/240 plug is connected to either the 120 or 240 Vac connector on the EMI board depending on your application. Factory default is
120 Vac.
6. Connect the ground wire to the ground screw on the back of the toroid assembly.
7. Connect the white wire from the toroid assembly to NEUTRAL using a wire nut.
8. Connect the black wire from the toroid assembly to HOT using a wire nut.
9. Replace the toroid assembly and tighten the screws. Ensure the wires are not pinched.
10. Connect a jumper between the positive (+) terminal of one battery to the negative (-) terminal of the other battery.
11. Connect the red wire from the J15 plug labeled BATT (+) to the positive (+) terminal of the battery.
12. Connect the black wire from the J15 plug labeled BATT (-) to the negative (-) terminal of the battery.
13. Plug the J15 plug into the control board. The control board will power up. NOTE: You may see a small spark when plugging the J15 plug into the
board.
14. Turn ON AC power.
Red Wire (+)
INSTALLATION
LARGE METAL CONTROL BOX (LA500CONTXLMU)
J15 Plug
Jumper
Black Wire (-)
Toroid Assembly
21
(back view of toroid assembly)
Ground
Screw
(incoming power wires)
240 Vac
Connector
120 Vac
Connector