REMEHA Gas 310 ECO Technical Information page 16

7.3 Flue gas discharge and air supply
7.3.1 General
The Remeha Gas 310 ECO is suitable for both conven-
tional room ventilated or eccentric room sealed opera-
tion. Room sealed terminals should comply with the
Gastec QA-requirements for vertical outlet constructions.
Any horizontal pipework in the flue gas discharge sys-
tem should slope towards the boiler with a drain connec-
tion positioned approx. 300mm from the boiler connec-
tion. Horizontal pipework in the air supply system should
slope towards the supply opening and may require a
drain point at the low point.
Care should be taken when siting flue exit positions as
a vapour plume will be visible when the boiler is opera-
tional (flue gas temperature will be less than < 77°
resulting in the water vapour condensing out on contact
with the air).
7.3.2 Classification due to discharging flue gases
Classification according to CE:
Type B23: Conventional room ventilated appliance with-
out draft diverter. Air supply from boiler room; flue gas
discharge on roof.
Type C33: Room sealed appliance, connected to com-
bined roof outlet.
Type C43: Room sealed appliance in cascade configu-
ration, connected via two ducts to a common duct sys-
tem serving more than one appliance.
Type C53: Room sealed appliance, connected to sepa-
rate ducts for the air supply and flue gas discharge, ter-
minated in zones of different pressure.
Type C63: Room sealed appliance, supplied without the
terminal or the air supply and flue gas discharge ducts.
Type C83: Boiler with room sealed operation, connected
to separate air supply and flue gas discharge duct, with
flue gas discharge duct always in depression.
Conventional flue or room ventilated installations:
A room-ventilated boiler takes the required combustion
air from the plant room. Combustion air for the boiler
must be provided to the room/ compartment in accord-
ance with BS 6644. A table showing the maximum
discharge lengths for the room ventilated version of the
Remeha Gas 310 ECO can be found in section 7.3.6.
Room sealed installations:
It is unnecessary to provide separate combustion air to
the room/compartment as this is supplied direct to the
boiler via the eccentric flue and air inlet system to the
vertical terminal unit (see 0, VRS 200/250 options avail-
able from Broag).
Additional ventilation will be required to the room/
compartment in accordance with BS 6644 (compart-
ment ventilation). For installations where supply and dis-
charge points are in two different pressure zones CLV
system please contact Broag Technical Dept. for further
details and advice.
Supplied By www.heating spares.co Tel. 0161 620 6677
Note: The boilers can also be installed on a flue dilu-
tion system, but must incorporate a total flue break to
avoid boiler gas/air ratio controls being affected by the
flue dilution fan pressures. For full details please contact
Broag.
A table showing maximum air supply/ flue gas discharge
lengths for the room sealed version of the Remeha Gas
310 ECO can be found in section 7.3.7.
7.3.3 Connection options
The Remeha Gas 310 ECO is available in a room venti-
lated and a room sealed version. If the room-sealed ver-
sion is used, the grille must be removed before installing
the air supply pipe.
7.3.4 Inlets/Outlets
For conventional flue systems the flue terminal exit point
should discharge vertically and be c/w a tapered cone
and bird guard. For room sealed options use the Broag
VRS terminals.
7.3.5 Other requirements
Flue gas discharge materials:
Single wall, rigid: stainless steel, thick-walled aluminium
(to comply with building regulations).
Flexible: stainless steel
(to comply with building regulations).
Flue gas discharge structure:
The flue gas discharge pipe must have airtight and
watertight joints and connections, or should be seam-
less. Horizontal sections in the flue gas discharge pipe
must slope down towards the boiler (at least 5-cm per
meter) and incorporate a drain point within 300mm of
the boiler connection.
Flue liners:
If flue liners are used they must be manufactured from
gas and water tight airtight, thick-walled rigid aluminium
or stainless steel (flexible plastic (with a continuous
operating temperature rating of 120°) and stainless
steel pipe liners are also acceptable provided they are
water and gas tight).
Air supply materials:
Single wall, rigid or flexible: aluminium, stainless steel.
Air supply structure:
The air supply pipe must also be airtight. Horizontal sec-
tions in the air supply must slope away from the boiler
towards the supply opening and incorporate a drain con-
nection if the route rises from a lower point that could
flood.
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