Bosch Greenstar 12i Service Manual download pdf (Page 16)

PRE-INSTALLATION

6 720 644 743b (2011/08)

3.4.2 EXTERNAL CONNECTIONS

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:

B The external run be kept as short as possible and not

exceed three metres.

B 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.

B 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.

B 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 figure 13 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 boiler condensate outlet and the

drainpipe, outside the property, to avoid flooding

during adverse weather conditions.

Fig. 13 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. 14 External disposal

NOTICE: Freezing conditions

B Pipe work length should be kept to a

minimum and the route as vertical as

possible.

B Weather proof insulation must be used.

NOTICE: Condensate waste

B Care should be taken when siting a soak-

away to avoid obstructing existing

services.

Continued - Key to condensate illustrations

8 PVCu strap on fitting

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

* Condensate trap of 75mm already

incorporated into the boiler

Tab. 12

Condensate drainage pipe can be run above

or below ground.

18 8

6720644744-09.2Wo

25mm min.

6720644744-10.2Wo

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 71 72

Comments to this Manuals

No comments

Bosch Greenstar 12i Service Manual Page 16

Comments to this Manuals

Related products and manuals for Water heaters & boilers Bosch Greenstar 12i