28 Installing the System Piping
10
9
2
1
3
4
11
5
6
7
8
#
Description
1
Condensate discharge pipe from boiler
2
Pipe size transition point
3
Water/weather proof insulation
4
43 mm 90° male/female bend
5
External rain water pipe into foul water
6
External air break
7
Air gap
8
68 mm ø PVCu strap-on fitting
9
Minimum internal diameter 19 mm
10 Minimum internal diameter 30 mm
11 End cut at 45°
1
8
9
10
3
4
5
6 7
≥500
≥300
≥25
2
11
#
Description
1
Condensate discharge pipe from boiler
2
Ground (this section of the condensate drainage pipe may
be run either above or below ground level); End cut at 45°
3
Diameter 100 mm minimum plastic tube
4
Bottom of tube sealed
5
Limestone chippings
6
Two rows of three 12 mm holes at 25 mm centres, 50 mm
from bottom of tube and facing away from house
7
Hole depth 400 mm minimum by 300 mm diameter
8
Minimum internal diameter 19 mm
(fall at least 45 mm per meter)
9
Pipe size transition point
10 Minimum internal diameter 30 mm
11 Water/weather proof insulation
1
7
8
2
75
450
3
5
9
4
6
#
Description
1
Boiler
2
Visible air break
3
75 mm trap
4
Soil and vent stack
5
Invert
6
450 mm minimum up to three storeys
7
Minimum internal diameter 19 mm
(fall at least 45 mm per meter)
8
Pipe size transition
9
Minimum internal diameter 30 mm
10 Water/weather proof insulation
38
1
6
2
8
9
7
3
5
≥25
4
#
Description
1
Boiler
2
Visible air break
3
38 mm minimum trap
4
External length of pipe 3 m maximum
5
Open end of condensate drainage pipe direct into gully 25
mm min below grating but above water level; end cut at 45°
6
Minimum internal diameter 19 mm
(fall at least 45 mm per meter)
7
Pipe size transition point
8
Minimum internal diameter 30 mm
9
Water/weather proof insulation
Summary of Contents for NCB300-28K
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