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On the specification sheet for OXBOX air-handlers, the “Optional TXV kit” for the 1.5-3.0 Ton / R-454B combination is listed as part number Trane 5AYTXVH3A1836A.
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The same sheet shows different tonnages for other TXV kits: e.g., 3.5-4.0 Ton = 5AYTXVH3A4248A.
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Separate from the TXV kit, the indoor coil options (cased coil) for 1.5-3.0 Ton, R-454B by OXBOX exist; for example: “COIL; R454B; 1.5-3.0 B-CAB CASED COIL” model J5MXCB004AC6HC.
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There is also a listing for “TXV Kit – Coil and Air Handler 1.5-3 Ton – R-454B” (item number 5AYTXVH3A1836A) indicating the kit is indeed marketed as a set for that tonnage.
