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Resideo TK300-30A-1FM Boiler Trim Kit 319847-401 This maintains the high-side pressure

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Description

Resideo TK300 30A 1FM Boiler Trim Kit 319847 401 This maintains the high side pressure This maintains the high side pressure at a level sufficient to keep the thermostatic expansion valve (TXV) operating within its intended capacity during low outdoor temperatures using the specified Laars R0458601 is recommended to ensure the rod length and positioning correctly intersect the flame envelope for a stable signal

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