Slant/Fin Gas Steam - Manual (Page 3)

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BOILER PLANT SIZING
Older buildings may have a heat loss significantly less than that
of the original building. To size a replacement steam boiler plant,
consider the following: Replacement steam boiler plants must be
sized to match the connected radiation load. Under-sizing will
prevent steam from reaching distant radiation quickly.
BOILER ROOM DESIGN
Caravan modular boiler systems allow better utilization of floor
space and permit future expansion with minimum cost. The mod-
ules are hand truckable, fit through doorways and often may be
installed around an existing inoperative boiler. They can be
grouped in single or multiple banks. Systems consisting of five or
more modules should be piped in two or more banks.
BOILER ROOM AIR SUPPLY
To ensure safe, efficient operation, the modular boiler system
must be supplied with sufficient air to support complete combus-
tion, replacing air entering draft dampers or draft hoods and ven-
tilating the boiler room or areas.
For additional information, not listed below, see ANSI. Z223.1,
section 5.3.3.
Figure 2: Correct location of combustion-air supply ducts.
INSTALLATION IN ENCLOSED BOILER ROOM REQUIRES
TWO UNOBSTRUCTED OPENINGS FOR PASSAGE OF AIR
INTO THE BOILER ROOM:
1. Air drawn horizontally from outdoors DIRECTLY
through an outside wall; one louvered opening near the
floor (below burner air inlet) and one louvered opening
near the ceiling (above the highest draft regulator), each
opening with a minimum FREE air passage area of
1 square inch per 4000 BTUH of total system input.
2. Air drawn horizontally through HORIZONTAL DUCTS;
one opening near the floor (below burner inlet) and one
opening near the ceiling (above the highest draft regulator),
each opening with a minimum FREE air passage area of
1 square inch per 2000 BTUH.
3. Air drawn VERTICALLY from outdoors; one opening at
the floor and one opening at the ceiling, each opening with
a minimum FREE air passage area of 1 square inch per
4000 BTUH of total system input.
4. Air drawn from inside the building; one opening near
the floor (below burner inlet) and one opening near the
ceiling (above the highest draft regulator), each opening
with a minimum FREE air passage area of 1 square inch
per 1000 BTUH of total system input.
IF BOILERS ARE INSTALLED ADJACENT TO OTHER FUEL
BURNING EQUIPMENT, THE AREA OF FREE OPENINGS
MUST BE APPROPRIATELY INCREASSED TO ACCOMMO-
DATE THE ADDITIONAL LOAD.
UNLESS PROPERLY CONTROLLED, AVOID THE USE OF
FORCED VENTILATION, SINCE IT CAN CREATE AN
UNDESIRABLE PRESSURE DIFFERENTIAL BETWEEN
BOILER ROOM AND AIR SOURCE.