Cleaning The Flue Outlet And Heat Exchanger - Viessmann Vitoradial 300-T Service Instructions Manual

Commissioning, inspection, maintenance
Checking the heat exchanger gasket
2. Remove retaining springs
ing.
3. Remove heat exchanger cover
4 hexagon nuts.

Cleaning the flue outlet and heat exchanger

Fig. 9
Note
Before and after cleaning the flue draught and heating
surfaces, determine the pressure drop on the hot gas
side; see chapter "Adjusting the burner". If dirt has
caused the pressure drop on the hot gas side to
increase by more than 30 % since the last time it was
cleaned, shorten the cleaning interval. After cleaning,
check the burner adjustment once again in accordance
with the chapter "Adjusting the burner".
1. Remove condensate hose and stench trap from
the heat exchanger.
2. Attach hoses (provided on-site) to the conden-
C
sate drain. Route into appropriate container
3. Vacuum up combustion residues in the flue pipe,
flue gas collector and heat exchanger through
cleaning apertures
A
!
Please note
Contact with unalloyed iron and scratches
on parts in contact with flue gases can lead
to corrosion.
Only use plastic brushes, not wire brushes
or sharp objects.
18
D . Remove fabric lin-
by undoing the
C
C
D
.
D
and .
B
(cont.)
4. Remove gasket
B
Assembly
Assemble in reverse order.
Tighten cleaning cover to 5 Nm.
A
B
4. Coat the heat exchanger coil with cleaning agent
through cleaning aperture
accordance with the cleaning agent manufacturer's
instructions. Use cleaning agents such as Biocircle
or Sotin smoke resin removers.
If heavily contaminated, use a high pressure clean-
ing device and Sotin combustion chamber cleaning
kit WTF1 with a special rotary nozzle and cleaning
agent.
5. Before installation, check the stench trap and con-
densate drain for contamination and clean if
required. Fill the trap with water.
Note
If the trap is found to have dried out, optimise the
system hydraulics to improve its condensation
properties. Increase the number of maintenance
intervals for the trap.
Danger
Escaping flue gas poses a risk to health.
To prevent flue gas from escaping, always
connect the condensate drain with a trap.
Neutralising system installation and operating
instructions
and clean the sealing face.
. Then proceed in
A