Navien NCB700-2S Plus 42K Installation & Operation Manual page 40

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# 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
Minimum internal diameter 19 mm
7
(fall at least 45 mm per meter)
8 Pipe size transition
9 Minimum internal diameter 30 mm
10 Water/weather proof insulation
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6
# Description
1 Boiler
2 Visible air break
3 38 mm minimum trap
4 External length of pipe 3 m maximum
Open end of condensate drainage pipe direct into gully 25
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mm min below grating but above water level; end cut at 45°
Minimum internal diameter 19 mm
6
(fall at least 45 mm per meter)
7 Pipe size transition point
8 Minimum internal diameter 30 mm
9 Water/weather proof insulation
40 Installing the System Piping
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# 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°
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9 10
# Description
1 Condensate discharge pipe from boiler
Ground (this section of the condensate drainage pipe may
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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
Two rows of three 12 mm holes at 25 mm centres, 50 mm
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from bottom of tube and facing away from house
7 Hole depth 400 mm minimum by 300 mm diameter
Minimum internal diameter 19 mm
8
(fall at least 45 mm per meter)
9 Pipe size transition point
10 Minimum internal diameter 30 mm
11 Water/weather proof insulation
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≥500
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