Progressive Industries EMS-LCHW50 - Manual (Page 4)

Installation Instructions Before Transfer Box Model EMS-LCHW50
For installation, in addition to the EMS Kit, you will need:
• 6 mounting screws
• In some cases you will need a jumper cable, length to be
determined based on the placement of the EMS
• Always use #6 wire.
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
Picture A)
4. Strip back each conductor 3/8 inch on both stripped ends, (See
Picture A)
and attach ring terminals to green ground wires. If
this wire is solid wire, do not use ring terminals. Loop the wire
around the ground screw.
5. Remove the lid from the EMS. Next, remove the digital display
and pack of screws and then 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. Then connect the wires to the contactor by
attaching black to L1, white to L2, red to L3, and green to
ground screw on side of box. (See Picture B) 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 current sensor and
attach to T3. The arrow that is on the sensor needs to face T1
and T3 and the green ground wire to the ground screw on side of
box. (See Picture B) Make sure that the wire colors match up
across from each other. Torque down set screws and ground nut
to secure connections.
8. Double check all connections and make sure they are secure.
9. Remove the two screws on contactor where marked L1, L2, etc.
Next remove the top plastic plate with markings. Examine
inside, ensuring there are no loose plastic pieces inside the
contactor. If so, remove and re-install cover with two screws.