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> Wiring a Johnson A419 Controller, Contributed by Argyll
post Sep 6 2005, 08:43 AM
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Things you will need:
14ga extension cord
Needlenose pliers
Heavy wire cutters (to cut the extension cord)
Small screwdriver
Tiny screwdriver
Knife (to strip insulation from wire)
Clamp connector (Halex #20511 3/8")
2 Wire nuts (big enough to fit 3 14ga wires)
2 short "pigtail" wires, 14 or 16 gauge

Make certain that the extension cord is UNPLUGGED and REMAINS UNPLUGGED during the entire process.

Here is the Johnson A419 (120V) controller before wiring:

Cut the extension cord to your preferred dimensions. Stip the orange outer insulation back about 1 1/2 to 2 inches. Strip each of the three inside wires about 1/4" (the wires that attach directly to the terminal blocks can be stripped a little shorter). Run both cords through the clamp and attach the clamp to the controller housing.

Make sure you either

a) mark which black wire comes from the plug end or
b ) have a continuity checker handy. You will need to distinguish which black wire is which, and it's tough to do once things get clamped inside the box.

Have two short "pigtail" wires handy. I used white and black since that matches the wires they will attach to. I sacrificed a few inches of cord to obtain these.


1. Twist the two green wires together and put a wire nut on them.
2. Twist the two white wires AND a pigtail together and secure with a wire nut.
3. Attach the black wire from the plug end AND a pigtail to the terminal marked "120V" Attach the other end of the pigtail to the terminal marked "C."
4. Attach the black wire from the female end of the cord to the terminal marked "NO."
5. Attach the pigtail from step #2 to the terminal marked "COM"
6. Using the tiny screwdriver, wire the temperature probe wires to the terminals COM and SEN. This terminal block is toward the top of the controller.

That's it. Here is the controller before wires get attached to the terminals:

Ready to be closed up:

Be sure to set the jumpers inside the housing before you seal it up. These determine if you are in heating or cooling mode, and is you are shutting off or on at the setpoint.

This is the finished controller, ready for mounting on the fridge:
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