Manual Worcester-Bosch GREENSPRING CWi47 (page 24 of 64) (English)

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Installation instructions

GREENSPRING CWi47 – 6 720 646 322 (2015/04)

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 at least

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 water heater, 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.

Fitting an external air break

•Refer to Fig. 31 when a rain water down pipe is used to

dispose of condensate.

• An air break must be installed in the 43mm pipe work,

between the water heater condensate outlet and the

drainpipe, outside the property, to avoid flooding during

adverse weather conditions.

Fig. 31 Disposal into a rainwater down pipe

Where the pipe terminates over an open drain or gully, the pipe

should terminate below the grating level, but above water level,

in order to minimise “wind chill” at the open end.

The use of a drain cover (such as those used to prevent

blockage by leaves) may offer further protection from wind

chill.

Pipe drainage will be improved if the end is cut at 45 ° as

opposed to a straight cut.

Fig. 32 External disposal

Continued - Key to condensate illustrations

8 Condensate trap

9 100mm Ø minimum plastic pipe

10 Drainage holes

11 Limestone chippings

12 Bottom of sealed tube

13 Insulate and increase pipe size

14 Pipe work transition

15 External air break

16 Air gap

17 External rain water pipe into foul water

18 43mm 90 ° male/female bend

19 PVCu strap on fitting

* Condensate trap of 75mm already incorporated into

the water heater

Table 8

Condensate drainage pipe can be run above

or below ground.

6720646322-12.1V

6720646322-13.1V

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Worcester-Bosch GREENSPRING CWi47 Manual

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