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Installation Instructions Before Transfer Box
HW50C Visual Photo Library page 11 | Wiring Diagram on page 13
HW30C Visual Photo Library page 12 | Wiring Diagram on page 13
For installation, in addition to the EMS Kit, you will need:
• 4 mounting screws
• In some cases you will need a jumper cable, length to be
determined based on the placement of the EMS
•
Always
use #10 wire for the HW30C & #6 wire for the HW50C.
1. Unplug RV from AC power and be sure generator is off.
2. Determine a location for the EMS control box.
3. Cut the RV power cord about three (3) inches greater than the
distance from the junction box to the desired location of the EMS
control box. Then strip back the outer insulation three (3) inches on
input, and three (3) inches on output cable. (See visual references on
pages 11-13).
4. Strip back each conductor 3/8” on both stripped ends. (See visual
references on pages 11-13 ) and attach ring terminals to green
ground wires. If this wire is a solid wire, do not use ring terminals.
Loop the wire around the ground screw.
5. Remove the lid from the EMS. Inside the unit will be a display,
cable and pack of screws. Back off the six set screws from top
of contactor (L1, L2, etc.)
6. Take your long cable with the plug end and connect it to the input
side by sliding through the wire restraint on the end of the EMS
control box. Next connect the wires to the contactor by attaching
the black wire to L1, white to L2, red to L3, and green to ground
screw on side of box. (See visual references on pages 11-13).
Torque down set screws and ground nut to secure connections.
7. Take the short cable coming from the junction box by sliding it
through the wire restraint output side of the EMS control box. Next
slide the black wire through the current sensor containing the green
tape and connect to T1, then connect the white wire to T2. Now
slide the red wire through the other sensor and attach to T3. The
arrow side of the sensor needs to face T1 and T3.
[Continued on page 5]
