Step Two: Controls and wiring

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Next: Installing the condenser

  1. The controls can be mounted in many different locations, arrangements, and distance from the unit. The important step is to insert the silver probe on the thermostat into the evaporator coil. This probe will be inserted into the evaporator coil. The probe MUST go into the coil at least 1.5 inches to 2 inches. It does not matter where it enters the fins on the evaporator, it is only important that it is inserted. Be careful when unwinding the coil, they are fragile and if they are broke they have to be replaced.
  2. After the probe is inserted and the controls are ready to install it is time to wire the unit. There is a three-plug wire on the controls and the evaporator unit, the plug will have to male and one female barrel connector, they plug together. There will be a ground wire on the back of the unit; it will have to be grounded. If the unit does not have a black wire with a loop, it will have a stud on the back of the unit. This stud must be grounded, run a wire from a ground location to the back of the unit.
  3. Please note, many units have different color wires. If the thermostat is not hooked up to the blower switch with a jumper and the thermostat does not have a long wire coming off of it, this will have to be done first. On the back of the five prong fan switch there will be one spade connector designated with a "C" this is to be connected to the thermostat, the other connector on the thermostat goes to the compressor. There is not any particular way to hook them up. The final wire on the controls is the ignition wire; this wire will have a FUSE in it. Hook this wire up to a hot source that is turned on with the key.
  4. The wire that is on the thermostat that connects to the compressor will hook into a safety (hi/lo or binary) switch prior to plugging it into the compressor. It is hooked up in series from the thermostat to the binary to the compressor. A binary switch is recommended, but not necessary. The switch will protect the system if a problem occurs. The switches are not included with kits they must be purchased separately.
  5. Some controls are vacuum or electric, separate directions will be included for these setups.
  6. DO NOT HOOK UP THE COMPRESSOR WIRE UNTIL THE SYSTEM IS TO BE CHARGED, DOING SO COULD CAUSE MAJOR HARM TO THE COMPRESSOR.

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Next: Installing the condenser