Separating The Neutralizing System (If Installed) From The Boiler And Connecting The Drain Hose; Cleaning The Combustion Chamber And Heating Surfaces; Checking Gaskets And Thermal Insulation Parts; Checking All Connections For Leaks - Viessmann Vitocrossal 200 CM2 400 Service Instructions Manual

Vitocrossal 200, CM2 400, 500, 620 and 620 TX Service
Steps – Commissioning, Inspection and Maintenance
Commissioning, Inspection, Maintenance
(continued)
Separating the neutralizing system (if installed) from the
boiler and connecting the drain hose
1. Separate hose A to the neutralizing system from
siphon B.
2. Connect drain or cleaning hose C to the siphon and
run it to the drain.

Cleaning the combustion chamber and heating surfaces

Thoroughly clean the combustion chamber and heating
surfaces with a water jet.
Note: Scratches on parts that are in contact with flue gas
can lead to corrosion. Only use plastic brushes, not
wire brushes nor sharp objects.
For normal cleaning, flush the heating surfaces thoroughly
with a water jet. You may use cleaning agents if you
notice stubborn residues, surface discoloration or soot
deposits. For this, observe the following:
■ Only use solvent-free cleaning agents. Ensure that no
cleaning agent gets between the boiler body and the
thermal insulation.
Note: The cleaning agent must not contain
hydrocarbon-based solvents or potassium.
Follow the cleaning agents instructions.
■ Remove deposits of combustion by-products with
alkaline agents.
■ Remove coatings and surface discoloration (yellowish
brown) with phosphoric acid-based Antox 75 E Plus or
citric acid-based CitiSurf 3050 (by Stellar Solutions Inc.
■ Rinse thoroughly with water.

Checking gaskets and thermal insulation parts

1. Check gaskets and the sealing rope in the boiler door
for damage.
2. Check the thermal insulation components of the boiler
door for possible damage.
3. Replace any damaged parts.

Checking all connections for leaks

1. Check all connections on the heating water side and
sensor well for leaks.
Note: Also check the connections to control equipment
and to the minimum pressure switch (low water
indicator) for leaks.
21