Ensure the sensing bulb is securely strapped to the suction line at the 4 or 8 o’clock position and properly insulated before concluding the thermostatic expansion valve is defective

Rotation is easily reversed by swapping the two leads according to the connection diagram on the motor nameplate

Professionals often ask

000 PSI depending on tube wall thickness

Pro-tip: For precise calibration

Tjernlund Products 950-1067 Timer and Relay R-407C Ensure the sensing bulb isThe Tjernlund 950 1067 Timer and Relay is a specialized post purge control designed to maintain air flow after burner shutdown, effectively clearing combustion gases and preventing residual heat damage in side wall power venting systems. This adjustable 1 to 10 minute timer relay serves as a direct replacement for legacy models 950 1060 (24 VAC) and 950 1065 (115 VAC), offering flexible field integration for HST series side wall power venters,