18
6.2
Condensate drain connection
The condensate drain is placed at the centre and at the
bottom of the boiler and has a ¾ inch hose discharge.
Connect this flexible hose to the sewer system.
Use only plastic parts with the condensate drain. Metal
lines are not allowed.
Blockage of this drain might damage the boiler. The drain
connection is correct when the condensate can be seen
flowing away, e.g. using a funnel. Any damage that might
occur, when the drain is not installed correctly, is not
covered by the warranty of the boiler.
There should be an open connection of the condensate
hose into the sewage system. A possible under pressure
in the sewage system must never give the opportunity to
suck on the boiler’s condensate drain hose.
When mounting the bottom part of the siphon, before commissioning the boiler and/or after maintenance,
the siphon must ALWAYS be completely filled with water.
This is a safety measure: the water in the siphon keeps the flue gases from entering the plant room
by leaving the heat exchanger via the condensate drain.
6.3
Flow and return connections
We advise to install two service valves in the flow
and return pipes to the boiler, so the boiler can be
isolated from the heating system, when mainte-
nance or service needs to be carried out.
Mount the boiler pump ALWAYS in the return of
the boiler.
Do not use chlorine based fluxes for soldering any
pipes of the water system.
6.4
The expansion vessel
The capacity of the expansion vessel must be se-
lected and installed to match the capacity of the
central heating system and the static pressure. It
is suggested you fit the expansion vessel in the
return of the central heating system. It can be
combined with a drain valve for service and
maintenance.
Turn LEFT to open
Turn RIGHT to close
Fill with
water
to the
edge
S-CB
+
400 &
550
TOP VIEW
SUPPLIED
WITH
BOILER
SUPPLIED
WITH
BOILER
SAFETY
PRESSURE
RELIEF
VALVE
BOILER
SERVICE
VALVE
EXTERNAL
BOILER
PUMP (P1)
EXPANSION
VESSEL
ISOLATION
VALVE
EXPANSION
VESSEL
BOILER
SERVICE
VALVE
BOILER
DRAIN
VALVE
