Condensate Drain - Buderus Logamax plus GB162 Technical Manual

7

Condensate drain

7.1 Condensate drain
Route condensate from condensing boilers into the
public sewer system in accordance with local regulations.
It is crucial to determine whether the condensate must be
neutralised prior to induction into the sewer system. This
depends on the boiler output and the respective
regulations of the local water authority (
of Practice A 251 of the ATV applies [in Germany] to the
calculation of the annual amount of condensate. This
Code of Practice lists a specific amount of condensate as
a guide value of 0.14 kg/kWh.
It is appropriate to check local regulations
appertaining to draining condensate in good
time prior to installation. The local water
supply utility is the responsible body for
questions concerning waste water.
Neutralisation obligation
Boiler output
[kW]
≤ 25
> 25 to ≤ 200
> 200
Table 28 Neutralisation obligation for gas condensing
boilers
1) Neutralisation of the condensate is required when draining the
domestic waste water into a small treatment plant and for
buildings and properties with waste pipes which do not meet
the material requirements of the Code of Practice A 251
[Germany].
2) Neutralisation of the condensate is required for buildings where
the requirement of adequate admixing (
domestic waste water (at a ratio of 1:25) is not met.
Boiler output
2)
[kW]
25
50
100
150
200
Table 29 Conditions for adequate admixing of condensate with domestic waste water
1) Maximum values at a system temperature 40/30 °C and 2000 hours run
2) Combustion output
6 720 645 821 (2010/09) – Logamax plus GB162
tab. 28). Code
Neutralisation
1)
no
2)
no
yes
tab. 29) with
Boiler load
1)
Amount of condensate
3
[m /a]
7
14
28
42
56
For small systems with less than 25 kW output, there is
no obligation to neutralise (
does not flow into small treatment plants or if the drain
lines meet the material requirements of the Code of
Practice A 251 [Germany].
Materials for condensate hoses
According to the ATV datasheet A 251, the following are
suitable materials for condensate hoses:
• 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 an admixing of the condensate with domestic waste
water in a ratio of at least 1:25 is assured (
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 assured if the conditions in table 29 are
met. The above details refer to 2000 hours of full
utilisation in accordance with guideline VDI 2067
(maximum value).
Office and commercial
1)
buildings
Number of employees
≥ 10
≥ 20
≥ 40
≥ 60
≥ 80
Condensate drain 7
tab. 28) if the waste water
tab. 29),
1)
Residential building
Number of residential
units
≥ 1
≥ 2
≥ 4
≥ 6
≥ 8
85