What should a technician use to clean a completely clogged pilot assembly orifice of a spark ignition furnace?

Using an awl to clean a completely clogged pilot assembly orifice of a spark ignition furnace is appropriate because it allows for careful and precise cleaning without damaging the delicate components of the orifice. The orifice needs to be unobstructed for the proper flow of gas, and an awl can be used to dislodge any debris or buildup that may be causing the clog.

In this context, compressed air might seem like a viable option; however, it can sometimes push debris further into the assembly rather than removing it. A vacuum cleaner is generally more suitable for removing larger debris or particles from surfaces, but it may not be effective for clearing out small obstructions within the orifice itself. A steel brush, while effective for cleaning surfaces, can be too abrasive and risk damaging the orifice, which could lead to improper gas flow and further issues. Hence, using an awl strikes the right balance between effectiveness and safety for the pilot assembly’s delicate structure.