Atmos Multi 24/80, Installation & Servicing Instructions Manual, Page: 15 / 43

ATMOS MULTI version 2002 Page 15
Figure 4: Examples of flueing options.
The equivalent length of the required flue system's
configuration can be calculated from the resistance
factors given for the individual flue components in
table 3. In the worked example (fig 5) the maximum
permitted combined length for a 80mm dia. twin flue
is 64metres at a pressure of 100 Pa. Account has
already been taken of the resistance of the balanced
flue terminal. This can therefore be ignored in the
calculation.
Table 3. Flue resistance factors
Figure 5: Worked flue length example.
6.5 Condensate disposal.
Provisions must be made for the safe disposal of
condensate produced when the Atmos Multi is in
operation. The condensate drainage pipework must
be run in an acid resistant material such as plastic
waste pipe. Copper or steel pipe must not be used.
The pipework must incorporate a minimum 1:20
downward slope towards its point of termination,
which ideally should be an internal soil or waste pipe
to avoid the possible risk of freezing. Alternatively,
where this not possible the condensate may be
discharged into an external gulley or purpose-built
soakaway.
The condensate pipework must be protected against
freezing and any pipework external to the property
must be encased in waterproof insulation and be
restricted to a maximum length of 3m.