Bedienungsanleitung Buderus SB625WS (Seite 25 von 52) (Englisch)

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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°

6 720 805 218-22.1T

Type

Dimensions

inch [mm]

Fitting

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.

6 720 805 218-23.1T

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