Viessmann VITODENS 200 Start-Up And Service Instructions page 21

Steps
(continued)
S
ervice
S
ervice
19. Check neutralization unit (if applicable)
1. Check the pH value of the
condensate with pH measuring strip.
If the pH value is less than 6.5,
replace granulate.
2. If contaminated:
Rinse neutralization unit with tap
water.
3. Add granulate as marked.
20. Clean combustion chamber/heat exchanger surfaces, and mount burner
1. Remove burner cover panel (if still
installed) as per the removal and
reinstallation instructions on page 7
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. Mount burner and tighten diagonally
to a torque of 3.3 lb.ft. / 4.5 Nm
(six hexagon socket head cap
screws).
4. Fasten threaded connection for the
gas connection hose with a new
O-ring.
5. Connect electrical cables to
corresponding parts.
Initial Start-up and Service
IMPORTANT
pH measuring strip must be field
supplied.
IMPORTANT
The granulate is consumed as it
neutralizes the condensate. The red
marking indicates the min. filling level.
Installation Instructions
Neutralization Unit
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.
WARNING
Follow cleaning agent manufacturer's
safety instructions and wear
appropriate protective equipment.
IMPORTANT
Perform leak test.
Accessory
21