This kit is the specific McDonnell & Miller 421-30 replacement part for any Series 25A

this component provides the local interface but does not replace external sensing logic

meeting international standards for durability

maintaining exact discharge temperatures between 110-170°F

This BACnet/IP server acts as an essential gateway

Trane VAL19951 TXV 321042-401 This kit is the specificThe Trane VAL19951 is a commercial grade 6 ton R410A TXV engineered for precise refrigerant metering in high capacity cooling systems. This thermostatic expansion valve features a 3 8" x 1 2" connection size with ODF solder fittings, ensuring a secure, leak free integration into the liquid line. Designed specifically for R410A refrigerant, it maintains the ideal superheat balance across the evaporator coil to prevent liquid slugging and protect the