Desa BG Series Technical Information, Installation And Operating Instructions page 153

For good heater operation and conservation, we recommend you carry out periodical cleaning and maintenance
operations. Any operation of this type must be carried out by specialised personnel qualified for the function.
The operations must be done when the heater has cooled down, turning off both the electrical and the fuel supplies.
HEAT EXCHANGER CLEANING
Cleaning the heat exchanger must be done by qualified
personnel, and is regulated by specific prescriptions. The
operation should be done at least once a year, at the start
of the winter season, proceeding as follows:
Type 1÷4
Remove the inspection panel (1), the inspection door
–
(2) and the burner following the indications in the
specific manual, and extract the diaphragm (only for
models type 1÷2).
Clean the internal surfaces of the heat exchanger (3)
–
using brushes or other tools of suitable shapes and
sizes.
Remove the deposits
–
combustion chamber (8) using a vacuum system
through the burner opening (9).
Remove the deposits accumulated in the rear fluegas
–
collector (4) using a vacuum system through the
chimney connection (5) (only for models type 1÷2).
Type 5÷7
Remove the inspection panel (1), the inspection door
–
(2), and the burner following the indications in the
specific manual.
Clean the internal surfaces of the heat exchanger (3)
–
using brushes or other tools of suitable shapes and
sizes.
Remove the deposits accumulated in the combustion
–
chamber (8) using a vacuum system through the
burner opening (9).
Remove the deposits accumulated in the rear flue
–
collector (4) using a vacuum system through the
lateral inspection openings (10).
We suggest the use of protective gloves; when using
ladders or other means of access, all operations
must be carried out using suitable systems, in
conditions of complete safety.
MAINTENANCE
that accumulate in the
2
1
1 2
2
25
Type 1÷2
3
4
2
5
1
8
Type 3÷4
3
9
Type 5÷7
7
4
3
6
10
6
9 8 7