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this SPST (Single Pole Single Throw) switch ensures the combustion blower is moving sufficient air to safely vent flue gases before the ignition sequence initiates
This HVAC safety control is designed for standard mounting configurations
ensuring the load is always interrupted once the dial reaches zero
making it suitable for coil freeze-up prevention rather than furnace over-temp protection
As an OEM Carrier furnace part
Trane VAL7991 TXV 319848-301 this SPST (Single Pole SingleThe Trane VAL7991 TXV is a high precision thermostatic expansion valve engineered for 1. 5 ton HVAC systems. Designed for professional refrigerant flow control, this valve features 5 16 inch ODF x 5 8 inch ODF connections and includes a 36 inch capillary tube to ensure accurate superheat monitoring at the evaporator outlet. As a critical component in maintaining system efficiency, the Trane VAL07991 (the updated OEM part number) modulates refrigerant