HVACR installation work consists of:
1) Installing the indoor and outdoor equipment, (a split system is preferred
because it offers more installation options and because small tubes penetrate
the building envelope).
2) Installing the refrigerant lines.
3) Installing supply air outlets and returns.
4) Installing duct runs (must be sealed and insulated to R-6 or R-8 if in unconditioned space).
5) Installing control system.
6) Installing furnace gas piping and vent (if applicable).
7) Charging the refrigerant system.
