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Buderus SB625WS Manual

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Installation | 25
6 720 805 218 (2016/02)SB625WS/SB745WS
5.9 Combustion Air from an adjacent room
Where combustion air is to be used from within the building, air must be
provided into the equipment room through two permanent openings
into the inferior building. Each opening must have a minimum free area
of 1 square inch for each 1,000 Btuh of the total input rating of all fuel
burning equipment in the space. The louvers shall be located as follows:
top louver shall start within 12” of the ceiling and the bottom louver
within 12” of the floor as prescribed in NFPA 54.
5.10 Condensate Removal
The exhaust vent pipe must be pitched at least ¼ “ per foot of length back
to the boiler. This will allow condensate to drain back to the unit to be
disposed. Low spots in the venting where condensate may collect
should be avoided. A plastic hose or PVC drain pipe may be used to
condensate discharge to the neutralization system. Care should be
taken to avoid kinks and from raising the drain line above the trap
assembly.
5.11 Condensate
5.11.1 Draining the condensate
Condensing boilers produce a flow of condensate that varies according
to operating conditions. The maximum hourly production of condensate
is shown in the technical specifications table for each individual model.
The condensate drain system must be suitably dimensioned to cope with
the flow produced. Also, pipe and hose diameter must not be less than
1” at any point. This diameter corresponds to that of the boiler’s
condensate drain fitting [1].
The connection to the waste water drain pit must be made in compliance
with national and local legislation and standards.
To prevent combustion fumes from leaking into the air of the boiler
room, the condensate drain pipe must incorporate a siphon creating a
minimum head equivalent to the fireside pressure drop ( Tab. 5,
page 9) plus 1 inch W.C. The connecting pipes between the boiler,
siphon and waste water drain pit must be laid at a minimum down slope
of 3° and must be installed in such a way as to prevent any build-up of
condensate.
Fig. 23 Draining the condensate
[1] Condensate drain fitting
EX: (SB625WS/290)
• Boiler pressure = 1.284 inches W.C.
• Siphon head = 1.284 inches + 1 inch = 2.28 inches (approx.)
5.11.2 Neutralizing the condensate
Neutralization unit types NB-5LP, NB-6
The NB neutralization unit is designed for systems with boiler
condensate drain pits located at a lower level than the boiler condensate
drain fitting. These neutralization units do not require any electrical
connections.
The inlet fitting of the NB neutralization unit (the lower fitting) must be
connected to the boiler condensate drain fitting.
The outlet fitting of the neutralization unit (the top fitting) must be
connected to the boiler room’s waste water drain pit using a section of
flexible hose or PVC pipe (not supplied).
Fig. 24 Neutralization unit type NB-5LP
[1] Outlet fitting
[2] Inlet fitting
If it ever proves necessary to neutralize the condensate that forms in the
flue gas stack, connect the condensate drain fittings of the boiler and
flue gas stack together using a ‘T’ union and connect the leg of the ‘T’ to
the inlet of the neutralization unit.
≥3°
≥3°
6 720 805 218-22.1T
1
Type
Dimensions
inch [mm]
Fitting
Ø
NB-5LP 9x36 1/4x7 5/16 (228x921x192) 1”
NB-6 12x12x12 3/16 (305x305x306) 1”1/4
Table 12 Neutralization unit types NB-5LP, NB-6
NOTICE:
The boiler room’s condensate drain pit must be located
at a lower level than the fitting on the neutralization unit.
NOTICE:
All connecting hoses must be kept as straight and as
short as possible. Any curves or sharp bends can lead to
the hoses becoming clogged and can therefore prevent
proper condensate discharge.
1
2
6 720 805 218-23.1T
… 25 …


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