Bedienungsanleitung Junkers MKB 400-3 A (Seite 41 von 116) (Englisch)

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Engineering information and sizing the heat source

6 720 645 817 (2010/09)

5.4 Condensate drainage

Route the condensate from condensing boilers correctly

into the public sewage system. It is essential to

determine whether the condensate must be neutralised

prior to discharge into the sewer system. This depends

on the boiler output and the relevant regulations of the

local water authority (Æ table 20). In Germany, the Code

of Practice ATV-DVWK-A 25 of the Deutsche Vereinigung

für Wasserwirtschaft, Abwasser und Abfall e.V (DWA)

applies for the calculation of the amount of condensate

created per annum. This Code of Practice lists a specific

amount of condensate as an empirical value for natural

gas, i.e. a maximum of 0.14 kg/kWh.

Form. 5 Accurate calculation of the condensate volume

per annum

Boiler hours in full use (full load) in h/a

Specific condensate volume in kg/kWh

(assumed density = 1 kg/l)

Rated heat input of the heat source in kW

Condensate flow rate in l/h

Neutralising obligation

Materials for condensate lines

Suitable materials for condensate lines in accordance

with DWA Code of Practice ATV-DVWK-A 25 [Germany]

are the following:

• Earthenware pipes (to DIN EN 295-1)

• Rigid PVC pipes

• PVC pipes (polyethylene)

• PE-HD pipes (polypropylene)

• PP pipes

• ABS-ASA pipes

• Stainless steel pipes

• Borosilicate glass pipes

If admixing of the condensate with domestic waste

water in a ratio of at least 1:25 is assured (Æ table 21),

then the following may be used:

• Fibre cement pipe

• Cast iron or steel pipes to DIN 19522-1 and

DIN 19530-1 and 19530-2

Copper pipes are unsuitable for draining condensate.

Adequate admixing

Adequate admixing of the condensate with domestic

waste water is given when the conditions in table 21 are

met. The details refer to 2000 hours of full utilisation in

accordance with guideline VDI 2067 (maximum value).

It is advisable to check local regulations on

draining condensate in good time prior to

installation. The local water supply utility is

the responsible body for questions

concerning waste water.

Boiler output in kW Neutralisation

> 25 to ≤ 200 no

1) Neutralisation of the condensate is required for buildings

where the requirement of adequate admixing (Æ table 21)

with domestic waste water (at a ratio of 1:25) is not met.

> 200 yes

Tab. 20 Neutralising obligation for gas condensing boilers

× b×

Boiler load

Boiler

output

1) Rated heat input

Volume of

condensate

2) Maximum values at a system temperature 40/30 °C and

2000 hours run

Office and

commercial

buildings

Number of

employees

Residential

building

Number of

residential

units

100 28 ≥ 40 ≥ 4

150 42 ≥ 60 ≥ 6

200 56 ≥ 80 ≥ 8

Tab. 21 Conditions for adequate admixing of condensate

with domestic waste water

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