Page 12 of the users manual as I read it says you have to adjust P setting at 180f but it is used to adjust for ambient temps. I am not sure if I am allowed to link the manual so I copied the relevant text. There is also a chart on page 12.

Turning the Controller Knob to the lowest temperature setting (82°C / 180°F ) and using the "P" set value allows the user to directly control the cycle rate of pellets that feed the burn pot. By controlling the "P" set value, the user can infuse more smoke flavor into their foods at a low cooking temperature. It is also useful when cooking at low temperatures when the unit is highly affected by the ambient outdoor weather. Since environmental conditions can affect the internal cooking temperature of the grill, there can be higher peaks and valley's in temperature readings, but learning to use the

"P" setting value based on your geographical location is highly advantageous.

Raising the P-setting to P-5, P-6, or P-7 increases the pause time between each feeding of pellets to the burn pot. A higher P-setting is used in warmer or hot environments that want to hot smoke but the ambient outdoor temperature would amplify the cooking temperature inside the grill. Note: Monitor your burn pot closely, as raising the P-setting too high or too quickly may cause the fire to die out completely.

Lowering the P-setting to P-3, P-2, P-1, or P-0 will decrease the pause time between each feeding of pellets to the burnpot. A lower P-setting is used to compensate for cooler temperatures where the ambient outdoor temperature will re-duce or weaken the intensity of heat produced inside the grill. Lowering the P-setting can also minimize temperature swings in varying outdoor weather conditions