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• Only flue systems, which are approved for a flue gas temperature of at
least 120 °C, may be used.
• Route the flue gas as directly as possible to the chimney considering
the best possible flow characteristics (e.g. short, rising, and with the
fewest possible bends). Provide a separate chimney flue for each
boiler. Take the thermal expansion of the system into account.
• Implement deviations in the connection pieces as favourably as
possible where flow is concerned by using bends or deflectors.
Connection pieces with several deviations should be avoided, as they
would have a detrimental effect on air-borne and structure-borne
noise as well as the start-up pressure hammer. Prevent sharp-edged
joints between rectangular connection flanges and the connection
pipe. As with any reductions/expansions that may be required, the
angle of the joint should not exceed 30°.
• Where possible, connection pieces should be joined to the chimney to
provide optimum flow characteristics and with an incline (at an angle
less than 45°). Any terminal pieces at the chimney outlets must
ensure the free discharge of flue gas to atmosphere.
• Any condensate must be able to drain freely over the entire length, be
treated and drained off in accordance with local regulations.
• Provide inspection apertures in accordance with local regulations, if
necessary after discussion with the local authorising body.
• The chimney must be separated from the boiler (e.g. with
compensators) to prevent the transfer of structure-borne noise.
• If a flue gas damper is installed in the flue system, integrate an "OPEN"
limit switch into the boiler control system for safety reasons.
Combustion must only be able to start when the feedback from the
limit switch confirms that the flue damper is fully open. A temperature
drop inside the boiler is possible on account of the time it takes the
actuator to move the damper into position. Set the "CLOSE" limit
position at the flue gas damper in such a way that it never closes fully.
This prevents damage to the fitted burner through heat build up.
5.4.2 Fitting a sealing collar
B Fit the sealing collar in accordance with the installation instructions
supplied.
5.4.3 Connecting the boiler to the pipework
NOTICE: System damage through leaking joints
B Connect pipes without stress to the boiler
connections.
Boiler contamination on the water side is not
permissible.
If required to prevent contamination, install a dirt trap in
the boiler return.
Connecting the heating return
The boiler has two inlet options for the return water. If separate system
returns for differing return temperatures are used (e.g. underfloor
heating, DHW heating), these can be routed to the boiler via separate
return connections.
• RK1 = Low return temperature (e.g. underfloor heating)
• RK2 = High return temperature (e.g. DHW heating)
On delivery, the return is sealed with a dummy flange. If using
connection RK2:
B Remove dummy flange.
If there are no varying return temperatures, return connection RK1 is
used.
Uni Condens 6000F
B Connect the heating system return to the appropriate boiler return
connection [5], [6].
4
5
6
Fig. 12 Boiler connections
[1]
Fittings manifold connection
[2]
Boiler flow connection
[3]
Pressure release valve connection (VSL)
[4]
Flue connection
[5]
Boiler return connection 1 (RK1)
[6]
Boiler return connection 2 (RK2)
Connecting the heating flow
B Connect the heating system flow to the boiler flow connection [2].
Connecting the fittings column
B Connect the fittings manifold (accessory) to the fittings manifold
connection [1].
Connecting the pressure release valve
NOTICE: System damage through connecting the wrong
assemblies to the pressure release valve connection.
B Never connect a DHW cylinder or other heating circuit
to the pressure release vlave connection.
B Connect the safety valve to the pressure release valve connection
(VSL) (
Fig. 12, [3], page 17).
5.4.4 Information on condensate neutralisation
NOTICE: System damage through condensate.
B Always keep the condensate drain pipe clear.
B Ensure that the condensate drain pipe and
neutralising system (where fitted) are working.
For the installation and maintenance of the neutralising
system, see the special installation instructions
(included in the standard delivery of the neutralising
system).
Installation | 17
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6 720 648 053-19.1T
6 720 803 637 (2012/03)
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