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6.8 Condense water drain
The condense water drain is next to the centre at the bottom of the boiler and has a ¾ inch hose discharge.
Connect this flexible hose to the drains via a tundish or oversize waste pipe. Also consider a waste trap.
N.B.!
Use only plastic parts with the condense water drain. Metal lines are not allowed.
Tip!
Blockage of this drain may cause damage to the boiler. The drain connection is correct when the condense
water can be seen flowing away, e.g. using a funnel. Any damage that may occur due to a blockage is not
covered by the warranty.
6.9 Central Heating
If plastic material for the flow and return from the radiators or under floor heating is being used and not
oxygen diffusion proof to DIN standard 4726/4729 a separation between the central heating water of the
boiler and the system will be required, e.g. using a plate heat exchanger. This will prevent contamination of
the boiler heat exchanger with magnetite. If the plastic material is not to the DIN standard failure to provide
such separation will void the warranty of any boiler parts relating to water.
6.9.1 Central Heating circuit
The S-CB has no pressure relief safety valve. This should be fitted in the flow of the system in close
proximity to the boiler (Boiler side of any valves). See pages 5 & 6.
The S-CB has no internal bypass. Low loss headers must be used to allow flow, even when all system valves
are closed.
Tip!
To prevent contamination of the S-CB heat exchanger, it is recommended to thoroughly flush the system
with clean running water prior to first use.
6.9.2 The expansion vessel
Please remember that the capacity of an expansion vessel is chosen or installed to match the capacity of the
central heating system and the static pressure. Fit the expansion vessel in the return of the central heating
system (see page 5 & 6 2.1 and 2.2) Expansion vessels and fill units available at extra cost from Strebel.
