Vaillant ecoTEC plus 612 Instructions For Installation And Servicing page 111

How to add extensions
Use a saw, tin-snips, etc. to cut tubes
to size.
No tools are required when
removing previously-fitted
extensions for cutting to size air
and flue tubes separately. When
doing so, the flue conduit should
be twisted into a position where
the shoulders on the plastic tube
can be pushed through the spacer-
piece. After cutting to size, refit
the flue conduit and secure it to
the air conduit.
Tip:
Start by measuring the required
length of air conduit* (L air ), and then
calculate the corresponding length of
flue conduit (L exhaust ) as follows:
L exhaust = L air + 40 mm
L exhaust = length of flue conduit
L air = length of air conduit
* Minimum length of air-conduit
extension: 100 mm.
Supplied By www.heating spares.co Tel. 0161 620 6677
FITTING AIR/FLUE DUCT EXTENSIONS
2
1
+ 40 mm
Fig. 6.1: Cutting tubes to size
Fig. 6.2: Loosening the flue conduit
Important:
You must fasten extensions to the
ceiling or wall using pipe clamps.
Use one clamp for each extension.
Important:
Where extensions are used, these
must be installed with a slope of 3°
±1° to ensure that condensate does
not remain in the sleeve (equivalent
to 50 mm ± 20 mm rise per metre
length).
1.
1 2
2.
The seals are sensitive to mineral
oil-based grease products. For this
reason, the seals must not be
greased. If the seals need wetting
to aid in installation, use water
only.
De-burr and file down any rough
edges on the tubes before fitting in
order to prevent damage to the
seals. Remove all metal filings and
other debris.
Do not use damaged or dented
tubes, as they will not form an
adequate seal.
Ensure that the seals remain
correctly aligned when installing
the tubes. Do not fit damaged
seals.
Secure the exhaust conduit with
the fixing device in order to ensure
that it is correctly centred relative
to the air conduit.
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