Condensate Pipework; Internal Connections; External Connections - Bosch Worcester Greenstar Danesmoor 12/18 Installation, Commissioning And Servicing Instruction Manual

4.4

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
21.5mm Ø Polypropylene pipe.
▶ The condensate pipe work 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 Pipe work transition
3 Soil and vent stack
4 Minimum 450mm and up to three storeys
5 Basin waste
6 Sink or basin with integrated overflow
7 75mm sink waste trap
8 Condensate pump
* Condensate trap of 75mm already incorporated into the boiler
4.4.1

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 internal kitchen or bathroom waste pipe,
washing machine waste pipe etc. A suitable permanent connection to
the foul waste pipe should be used.
Fig. 8 Disposal to a 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.
Fig. 9 Disposal to a waste pipe
Danesmoor Kitchen and Kitchen System 6 720 808218 (2013/10)
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.
Fig. 10 Disposal via a condensate pump
4.4.2

External connections

NOTICE: Freezing conditions
▶ Ideally run the pipework internally if possible.
▶ Pipe work length should be kept to a minimum and
the route as vertical as possible.
▶ Weather proof insulation must be used.
NOTICE: Condensate waste
▶ Care should be taken when siting a soak-away to
avoid obstructing existing services.
Continued - Key to condensate illustrations
9 Increase pipe size
10 Weather proof insulation
11 Rain water down pipe
12 External air break
13 43mm pipe (min 100mm upstand)
14 PVCu strap on fitting
15 43mm 90° male/female bend
If no other discharge method is possible then the use of an externally run
condensate drainage pipe terminating at a suitable foul water discharge
point, or purpose-designed soak away, may be considered. If this
method is chosen then the following measures should be adopted:
▶ The external run be kept as short as possible and not exceed three
metres.
▶ The pipe should be run internally as far as possible before going
externally and the pipe diameter should be increased to 32mm
before it passes through the wall to the exterior. The pipe should be
insulated using suitable waterproof and weather resistant insulation.
▶ The external pipe should take the shortest and least exposed route to
the discharge point, and should "fall" as steeply as possible away
from the boiler, with no horizontal runs in which condensate might
stand.
▶ The use of fittings, elbows etc. should be kept to a minimum and any
internal "burrs" on cut pipe work should be removed so that the
internal pipe section is as smooth as possible.
Pre-Installation
13