Step1: Disconnect electrical power and shut off the gas supply to the equipment.
Step2: Remove the control panel and label all thermostat wiring before disconnecting it.
Step3: Carefully remove the existing thermostat, sensing bulb, and capillary tube.
Step4: Install the new thermostat and secure the dial in the control panel.
Step5: Route the capillary tube along the original path, avoiding kinks or sharp bends.
Step6: Mount the sensing bulb in its original location and install the required adapters.
Step7: Reconnect wiring, restore power and gas, then verify proper temperature control and thermostat operation.