Step1: Disconnect electrical power and ensure the equipment is completely cool before servicing.
Step2: Remove the access panel and carefully locate the existing hi-limit thermostat assembly.
Step3: Disconnect wiring connections and carefully remove the capillary bulb from its bracket.
Step4: Install new thermostat, insert bulb into mounting position, and securely tighten fittings.
Step5: Reconnect wiring according to diagram, verify temperature settings, restore power, and test operation safely.