Sterling SSE-2 & Before proceeding, review the connecting diagram included with the unit.

SSE 2
Assembly instructions 4-9
4.6. Installation of the optional SKW proportioning valve
& Before proceeding, review the connecting diagram included with the unit.
For more information, refer to the manual that shipped with the SKW valve.
Connecting the SKW-E proportioning valve:
Control and power of the proportioning valve is supplied through a 4-wire control
connection.
Brown – Positive Power X7, L
Blue – Negative power X7, N
Black – Line signal X7, ZKW
Green w/ Yellow – Ground X3
1. Remove the control box face, and locate the removable plug in the bottom of the
box.
2. Remove the plug and feed the wire of the proportioning valve through the empty
hole.
3. Tighten the lock nut inside, position the wire length for optimum use and tighten the
lock nut on the outside.
4. Strip the wires so that 1/4” of wire is showing, for connection to terminal blocks.
5. Upon removal of the loader control face you will see two printed circuit boards. One
board on the reverse of the control face, and the other mounted inside the control
box. The ground wire will connect to the terminal block X3 on the back of the control
face. The other three wires connect to terminal block X7 inside the control box, in
order from left to right Brown, Blue, then Black. Please refer to the schematic in the
back of the manual.