Viessmann WB1A Series Installation And Service Instructions Manual page 57

Steps
(continued)
S
Maintenance
ervice
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17. Clean combustion chamber/heat exchanger surfaces
1. Remove burner cover panel (if still
installed) as per the removal and
reinstallation instructions on page 53
in this manual, and reinstall panel
upon completion of service work.
2. If necessary, clean the combustion
chamber and heat exchanger
surfaces with a brush and/or rinse
with water.
Use solvent-free cleaning agents to
remove residues:
H Remove deposits of soot with
alkaline agents containing tenside.
H Remove coatings and (yellowish
brown) surface discoloration with
phosphoric acid-based "Antox 75 E
Plus", or citric acid-based
CitriSurft 3050 by Stellar
Solutions Inc.
H Rinse thoroughly with water.
3. Connect electrical cables to
corresponding parts.
Initial Start-up, Inspection and Maintenance
Please note:
Be careful not to scratch parts which
are in contact with flue gas. Use
plastic brushes, not wire brushes!
The cleaning agents must not contain
hydrocarbon-based solvents or
potassium.
Follow cleaning agent manufacturer's
safety instructions and wear
appropriate protective equipment.
IMPORTANT
Perform leak test.
WARNING
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