How to Connect Lines to a HVAC Unit

Heating, Ventilation and Air Conditioning -- or HVAC -- units contain all the components necessary to force warm or cold air through a building, as the changing seasons and individual preferences demand. HVAC units typically connect with three lines, including an electrical conduit, to deliver the high voltage necessary to drive the fan motor and compressor. The lines connect in less than an hour using standard hand tools.

Adjustable wrench

Instructions

- 1
  Switch off the wall thermostat.
- 2
  Cut power to the outdoor electrical conduit by pulling downward on the lever on the side of the junction box for the HVAC unit. The box is usually located next to the main fuse box or circuit breaker panel in the building.
- 3
  Insert the prongs on the end of the conduit into the 240-volt socket on the side of the HVAC unit and push inward as far as the prongs will go.
- 4
  Slide the heavy hexagonal nut up the conduit and onto the threaded socket on the HVAC unit. Tighten the nut clockwise with an adjustable wrench.
- 5
  Attach the two vapor lines to the ports on the side of the unit and tighten the coupler on each with the adjustable wrench. One vapor line is smaller in diameter than the other, making it simple to identify the correct ports on the HVAC unit.
- 6
  Push the lever on the junction box to the upright position.
- 7
  Turn on the unit at the wall thermostat.

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