5°F - 12°F, the TXV is controlling properly. 2. If SH is less that 5°F, the SH adjustment may be too low. a. Adjust the SH by turning the adjustment stem clock-wise to increase the SH. b. Wait 20 minutes for the system to balance and ad-just again as required. c. If adjusting the valve has no effect on the SH, the. Initiating a Goodman TXV valve adjustment is a pivotal process for the optimal functioning of your HVAC system. In this hands-on guide, we walk you through every necessary step to achieve an accurately adjusted TXV valve, laying the foundation for a more efficient and longer-lasting HVAC system. Image Source: Wikimedia Commons

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Adjusting the TXV. To adjust the TXV, remove the nut covering the adjustable stem. First, make sure you have the manufacturer's instructions at the ready. Those instructions will let you know how much you need to rotate the stem to make fine adjustments. Then, figure out if you need to increase or decrease the superheat.. Bryan does an in-depth review of how to adjust a thermostatic expansion valve, also known as a TXV, TEV, or TX Valve. He explains why one would adjust a TXV.