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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
" it cannot drop to trigger the switch
providing the necessary phase shift for both the compressor (35 microfarad) and the condenser fan motor (5 microfarad)
alternative adapters or linkages would be required to ensure proper mechanical engagement
making it suitable for coil freeze-up prevention rather than furnace over-temp protection
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