TXVs used in cooling-only air-conditioning units and heat pumps are interchangeable as long as they are the same size and for the same refrigerant.

Question

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TXVs (Thermostatic Expansion Valves) are calibrated specifically for the conditions in which they operate, including the direction of refrigerant flow, which differs between cooling-only systems and heat pumps. Heat pumps require a bi-directional TXV for heating and cooling modes, while cooling-only systems use a unidirectional TXV.

TXVs Used in Cooling-Only Air-Conditioning Units and Heat Pumps Are