ASHRAE 90.1 2007 Appendix G System Type 6

I agree that these definitions are pretty murky. No, I don't think you are correct. See Table G3.1.1B...Package "terminal" units are system 1 and 2. The rest are all "rooftop" units. Whether the reheat occurs decentrally at the terminal (which is common in America) or centrally at the AHU is very unclear. However, in the USA these VAV terminal boxes are typically contain the reheat coil at the terminal (decentral). As they are also used to control the heating setpoint and not just to condition the air to say 22 C but used to heat by supplying air at up to 40 C (bear in mind for the baseline it must be Heating Setpoint + 11C and Cooling Setpoint - 11C), this makes sense. DX means no chilled water, so you don't have a chiller. Heating is electric, so no gas or oil It's not a Vertical, Room or Terminal unit DX is air cooled As you have an electric heater, the DX is not a reversable HP, so not Table 6.8.1B either That leave just Table 6.8.1A which applies to split AND single package systems. You have single package (split refers to the cooling dx coil being decentral as in the indoor units of a VRF system...again murky as this could also fit the system description, but VRF is not old and baseline enough, ha ha...again murky because the heating is split, ha ha). As this is DX (air cooled), forget about water or evap cooled for equipment type. Then sort by kW and Heating Section Type. To all those Americans reading this...I hope this offers a view into our world of confusion.

As Americans we expect everyone to know the vagaries of English and IP units and are equally confused when you don't! :-) Despite the murkiness you have reached the right answer I think. Use Table 6.8.1A.