PENSOTTI PCH 34B H Cleaning Procedure page 14

Combustion Chamber Cleaning Procedure

9. Using a 10mm wrench or socket, loosen the 4 nuts securing the burner to the main heat exchanger. Once loose, remove 3 of the nuts

and place them in a safe location. Hold the pre-mix burner tube with one hand while removing the final nut. Retain the 4 nuts.