Room Sealed System - elco THISION L EVO Series System Manual

Open flue systems continued...
When using an open flue system, Elco recommends that
an air inlet cover or air filter must be fitted on the air inlet
connection on the boiler, to stop any debris entering the
air supply and causing issues with the boilers
combustion. The flue system must be fitted with flue
pipes that have seamless connections only to avoid
leaks.
The maximum temperature of the flue gas for the wall
hung boiler range that we supply is 77°C so no protective
measures or clearances towards combustible objects
needs to be taken.
1.3 Room sealed flue systems
Room sealed flue can be constructed with either concentric flue pipe
or single pipe plastic flue (PPs). These type of systems are defined
by taking the combustion air supply from outside the room the boiler
is located.
With concentric flue pipe the combustion air is supplied and the flue
gas extracted through one concentric coaxial pipe. The combustion
air is supplied through the gap between the external painted
aluminium air pipe and the internal plastic flue pipe. Flue gases are
extracted through the internal plastic pipe (PPs).
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When designing a room sealed system please ensure that the
horizontal lengths must have a 3° fall towards the boiler to aid in any
condensate draining. It is not necessary to make a separate
condensate drain in the flue gas system as the condensate will be
drained via the boiler syphon.
In addition to this, we also recommend that flue brackets be used at 1
metre increments to support the flue pipe installation. The flue pipe
should also be designed to be as straight as possible to utilise the
maximum length of the flue that the boiler can run. If a bend is
unavoidable then they must not be installed directly one after another.
The maximum temperature of the flue gas for the wall hung boiler
range that we supply is 77°C so no protective measures or
clearances towards combustible objects needs to be taken.