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5
Installation
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.
• RK2 = High return temperature (e.g. DHW heating)
• RK1 = Low return temperature (e.g. underfloor heating)
If there are no varying return temperatures, return connection RK1 is
used.
▶ Connect the heating system return to the appropriate boiler return
connection RK1/RK2.
▶ Close off unused connections with a plug or blank flange.
Fig. 15 Boiler connections
[AA]
Flue gas connection
[AKO]
Condensate outlet
[EL]
Drain connection
[M]
Test point (sensor pocket); closed off with plug
[MDW] Minimum pressure switch (alternative to low water indicator)
[RK1]
Return connection 1
[RK2]
Return connection 2
[VK]
Boiler flow connection
[VSL]
Flow safety line/safety valve connections
[WMS]
Low water level limiter
Connecting the heating flow
▶ Connect the heating system flow to the boiler flow connection [VK].
Connecting the safety valve
NOTICE: System damage through connecting the wrong
assemblies to the flow safety line.
▶ Never connect a DHW cylinder or other heating circuit
to the flow safety line.
▶ Connect the safety valve to the flow safety line connection [VSL]
( Fig. 15, page 20).
For open vented systems, the safety pipe flow is connected to the
[VSL] connection.
20
5.5
VK
M
VSL
MDW
RK2
AA
AKO
▶ Fit the siphon provided [3] to the condensate drain [5].
▶ Undo cap [2] and fill siphon with approximately two litres of water.
RK1/EL
6 720 804 354-15.1ITL
Fig. 16 Installing the condensate hose
[1]
[2]
[3]
[4]
[5]
Please refer to the separate installation instructions for installation and
maintenance of the neutralisation system.
Installing the condensate hose and neutralising
system
DANGER: Risk to life through poisoning!
Open connections or siphons not filled with water can
cause escaping flue gas.
▶ Filling the siphon with water.
▶ Ensure that the siphon and flue gas connections are
sealed.
▶ Ensure that the sealing washer with gasket is seated in
the cap.
NOTICE: System damage through condensate.
▶ Always keep the condensate drain pipe clear and
working.
▶ Ensure that the condensate drain pipe and
neutralising system are working.
When installing the condensate line, observe the
following:
▶ Carefully and correctly route the condensate created
inside the boiler and possibly in the flue.
▶ Drain the condensate into the public sewerage system
in accordance with the requirements in your country.
▶ Observe regional regulations.
Connection bend
Cap
Siphon
Siphon outlet to neutralising system or drain
AKO condensate drain
Logano plus SB325 – 6 720 806 328 (2013/07)
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