Flue System For Condensing Boilers; Flue System Installation Options For The Vitoradial 300-T; Flue System For The Vitoradial 300-T - Viessmann VITOPLEX 200 Type SX2A Technical Manual

Design information
(cont.)

Flue system for condensing boilers

The condensing boiler cools the flue gases, subject to the heating
water return temperature, down into the condensing range. They then
leave the system with a relative humidity of 100 %. Subject to system
conditions, the flue gas temperature can reach up to 110 ºC. The low
flue gas temperature and the resulting low draught plus the additional
condensation of the flue gases inside the flue system make it a neces-
sity for the flue system manufacturer to calculate the system, which
must also be made from suitable materials.
Also, special requirements apply to the design and installation of the
flue system of condensing combustion systems.
When installing a Vitoradial 300-T in an attic, (type B33 to TRGI 2008),
the flue gas can be routed out as a vertical roof outlet (short-stemmed
chimney) (see stainless steel flue systems in the Vitoset pricelist).
Condensing boilers must be connected to tested and approved flue
pipes. Flue pipes must comply with Building Regulations.
Flue gas temperature sensor
According to the "Guideline for flue pipe approval" point 3.12, only
components which are approved parts of the flue pipe may be con-
nected to or be incorporated into flue pipes serving condensing boilers.
Therefore, apertures for the installation of flue gas temperature sen-
sors must be designed by the manufacturer and should be tested
together with the flue pipe. Subsequent drilling and fitting of third
party components is not permitted.

Flue system installation options for the Vitoradial 300-T

Open flue operation
A
B
A
1
B
C
A Flue gas
B Secondary ventilation
C Ventilation air

Flue system for the Vitoradial 300-T

The flue gases are expelled from the flue system with positive pres-
sure. The flue system meets the size requirements of the Vitoradial
300-T, is made from suitable materials, and is both tested & CE-des-
ignated.
Note
Use special FPM/FKM gasket sets when fitting PPs flue pipes for oil
operation.
Replace the gaskets before installing the flue system. The boiler flue
connections are already equipped with FPM/FKM gaskets.
Before commissioning the heating system, carry out a tightness test
of the entire flue system (incl. boiler flue connection).
Certificate no. 0036 CPD 9184 001
OIL/GAS BOILERS
The Vitoradial 300-T condensing boilers may also be connected to
moisture-resistant chimneys. According to DIN EN 13384, the chimney
manufacturer must provide a calculated verification, giving due con-
sideration to the flue gas values of the boiler (see specification in the
respective datasheet).
The flue pipes must be raised above roof level inside an existing or a
newly constructed chimney (casing without internal pipe). We would
recommend contacting a flue pipe manufacturer during the design
stage because of the size and design of the chimney.
Routing through a duct (type B
The boiler 1 draws combustion air from the installation room, and
expels flue gas through the flue pipe via the roof (balanced flow).
Connection to a moisture-resistant chimney (MR chimney, type
B , according to TRGI 2008)
23
3
The boiler 2 draws combustion air from the installation room and
expels the flue gas through a moisture-resistant chimney via the
roof.
Vertical outlet where no duct is available (type B
The boiler 3 draws combustion air from the installation room (attic),
and expels flue gas through the flue pipe via the roof.
2
Skoberne
Ostendstr. 1
D-64319 Pfungstadt
According to CE designation in accordance with DIN EN14471, the
plastic flue pipe (PPs) can be utilised up to a max. flue gas temperature
of 120 ºC (type B).
The plastic flue pipes are group B (max. permissible flue gas temper-
ature 120 ºC). Flue pipes in buildings must only be run inside dedica-
ted, linearly ventilated ducts or channels which meet the requirements
for chimney stacks to DIN 18160-1 (issue December 2001), section
4.4 to 4.9 or provide a fire resistance of 90 minutes (F90/L90) and offer
the stated minimum internal duct dimensions.
to TRGI 2008)
23
to TRGI 2008)
23
VIESMANN
35
10