PENSOTTI PCH 34B H Cleaning Procedure page 20

Combustion Chamber Cleaning Procedure
Warning
14. Clean the heat exchanger surfaces. Refer to the safety precautions section of this manual, beginning on page 5, before proceeding.
Remove the condensate drain hose from the neutralizer and/or drain and place into a bucket to collect the cleaning water. Using a vacuum
with a high efficiency filter, remove all of the loose debris from within the combustion chamber and heat exchanger surfaces.
Vacuum All Loose Debris From the Heat Exchanger Surfaces
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