Derek Cole explains why HVAC technicians must replace the filter drier every time the refrigerant system is opened or any component like service valves, pressure switches, or TXVs is touched. Skipping this step risks system damage and failure.
Never. I don't care if we're changing the service valve. I don't care if we're changing a pressure switch. I don't. As if the pressure switch is not one of the screws on. If you've got to break that and break something in, we should always be changing the filter dryer. I don't care what it is on that system. Txv, service valve, whatever it is, cold filter dryer is mandatory. 100% no questions asked mandatory.
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