External Air Roof Equipment

1 300 roof ventilation ratio.

External air roof equipment.

Displaced equipment can puncture and tear roof coverings thus allowing water to leak into the building. The air barrier system is the primary air enclosure boundary that separates indoor conditioned air and outdoor unconditioned air. Rooftop packaged units can be classified according to the type of heating they supply. No services such as hvac distribution ducts air handlers plumbing or fire sprinkler systems should be located external to the air barrier.

Today i will explain electrical wiring for different air conditioning systems types and equipment. An air to air heat exchanger generally installed in a roof space recovers heat from the internal air before it is discharged to the outside and uses that heat to warm the incoming air. Note the air barrier continuity where the wall meets the roof. Roof mounted outdoor air conditioner equipment as developed and agreed upon by the air conditioning heating refrigeration institute ahri and air conditioning contractor s national association inc.

York does not provide roof system materials required in the fl ashing of a structural member through a roof deck. Rooftop equipment frequently becomes detached from rooftops during hurricanes. Never attach roof ashing directly to a york rooftop unit. Equipment blown from a roof can damage buildings and injure people.

Water can enter the building at displaced equipment see figure 1. Electrical wiring diagrams for air conditioning systems continued. York does not recommend vibration isolation be pro vided on both the fan skid inside the unit and the curb. Vented roof assembly roof insulation thermal resistance depth at trus heel roof perimeter should be equal or greater to thermal resistance of exterior wall.

In order to use an antenna your television must have a built in tv tuner or you must have an external tuner connected to the antenna and television. Thus the york curb does not include a counter fl ashing receiver. There are rooftop packed units with either electric heating or gas fired heating. The purpose of these guidelines which cover curb and roof penetrations and sealings is to set forth good construction practices.