*PLUMBERSSTOCK EXPERT* responded:
Good day. This Symmons BP56-300-B30-V-LR-X Shower Valve and Trim Set features a limit stop screw which is used to control the valve handle from being turned to excessively hot water discharge temperatures. To adjust, remove first the dome cover, open the valve to your desired maximum temperature, and turn the limit stop screw in until it seats. For reference, please read the IMPORTANT notice written on page 1 of this manual. If you need further technical assistance, you may call the manufacturer at 800-796-6667. Thank you for visiting PlumbersStock.com!