Dear Dennis,
Glad to get your message.
About the thermal pad, please only install the outer thermal pad and omit the circular one. You can download the installation guide here and you will see the center circular is blank on the thermal pad.
If you have any questions, feel free to contact us.
https://shop.bitspower.com/index.php?route=product/product&product_id=2657&search=BP-DDCPC-WH