I've only seen it one way and that's as a complete header assy .. life would suck for some knuckleheads I know if it came any other way . .
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See the attachment which displays in on page 7 the Carrier by-flow accurator along with picture and part numbers. 38-2apd.pdf
Carriers' Biflow Accurator functions as a restrictor when refrigerant flow enters the indoor coil from the outdoor unit (cooling mode) and as a bypass valve when the flow is reversed.
Split system heat pumps had a flared accurator body at the air handler and another accurator body built into the liquid line service valve at the condensing unit for metering to the outdoor coil during heating.
The correct size accurator piston for the air handler was packaged with the condensing unit and was supposed to be swapped out with the original piston in the air handler.
It was used primarily on 10-12 SEER units. They are a precisely formed orifice which the refrigerant flows thru. They do not modulate refrigerant flow, as does the TXV. The flow rate thru the restrictor is a function of the pressure drop and the density of the refrigerent like a capillary tube. Units were charged by superheat like a cap tube unit.
On package heat pumps a dual accurator body contained an accurator piston on both ends of the body. In cooling mode one accurator would seat in the body, metering refrigerant flow and the other accurator would unseat providing bypass; on heating the flow and function would switch.
I don't believe Carrier uses these on higher SEER units and may have used a different name in later production. Some later package units had a fixed flow metering device "crimped" into the header tubes.
JUST A LITTLE CLOSER AND THE LITTER BOX IS ALL MINE!