Condensate Pipework; Internal Connections; External Connections - Worcester 27i System Compact Installation, Commissioning And Servicing Instructions

3.4

CONDENSATE PIPEWORK

NOTICE:
▶ Where a new or replacement boiler is being installed,
access to an internal "gravity discharge" point should
be one of the factors considered in determining boiler
location.
▶ The condensate pipe must be nominally
22mm Ø plastic pipe.
▶ The condensate pipework must fall at least 52mm per
metre towards the outlet and should take the shortest
practicable route.
▶ Ensure there are no blockages in the pipe run.
Key to condensate illustrations
1 Condensate discharge from boiler
2 Soil and vent stack
3 Minimum 450mm and up to three storeys
4 Visible air break at plug hole
5 Sink or basin with integrated overflow
6 75mm sink waste trap
7 Condensate pump
* Condensate trap of 75mm already incorporated into the boiler

3.4.1 INTERNAL CONNECTIONS

In order to minimise risk of freezing during prolonged cold spells, the
following methods of installing condensate drainage pipe should be
adopted, in order of priority.
Wherever possible, the condensate drainage pipe should be routed and
terminated so that the condensate drains away from the boiler under
gravity to a suitable internal foul water discharge point such as an
internal soil and vent stack. A suitable permanent connection to the foul
waste pipe should be used.
*
1
22mm Ø
Fig. 4 Disposal to soil vent stack
Alternatively if the first option is not possible an internal kitchen or
bathroom waste pipe, washing machine waste pipe etc. can be used.
Ensure that the condensate drain pipe is connected "down stream" of
the waste trap.
Greenstar i System Compact - 6 720 807 726 (2013/05)
2
3
*
1
100mm
22mm Ø
Fig. 5 Disposal to a waste pipe
CONDENSATE PUMP
Where "gravity discharge" to an internal termination is not physically
possible, or where very long internal runs would be required to reach a
suitable discharge point, condensate should be removed using a
proprietary condensate pump, of a specification recommended by the
boiler or condensate pump manufacturer.
The pump outlet pipe should discharge to a suitable internal foul water
discharge point such as an internal soil and vent stack, internal kitchen
or bathroom waste pipe, washing machine waste pipe etc. A suitable
permanent connection to the foul waste pipe should be used.
*
1
22mm Ø
Fig. 6 Condensate pump disposal

3.4.2 EXTERNAL CONNECTIONS

NOTICE: Freezing conditions
▶ When the position of the boiler prevents internal
routing, we recommend installing a CondenseSure
siphon to significantly reduce the risk of freezing.
▶ Pipework length should be kept to a minimum and the
route as vertical as possible.
▶ Weather proof insulation must be used, if not using a
CondenseSure siphon.
NOTICE: Condensate waste
▶ Care should be taken when siting a soak-away to avoid
obstructing existing services.
PRE-INSTALLATION
4
5
75mm
min.
6
4
5
75mm
min.
6
7
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