Weil-McLain GOLD CGa Manual page 11

GOLD CGa Gas-Fired Water Boiler — Boiler Manual
FREE AREA
given in this manual are free area (equals the area,
length times width of opening, after deduction for
louver obstruction).
Use the free area information provided by the louver manufacturer.
When this information is not available, assume:
of each opening with wood louvers would be 5 times the required
free area.
louvers, the actual area of each opening must be 1.67 times the
required free area.
Single air opening option
A single combustion air opening can be used in lieu of the two-opening
options on page 10, provided:
Clearances from boiler to walls
page 7.
Opening must be directly to outside
communicates directly to the outdoors (not to an interior space).
or vertical duct.
Opening placement
Opening size
area of all equipment vent connectors in the space, and . . .
Exception for large spaces
pliances) are installed in a space with a volume
of all installed appliances, provided:
tion, this page)
Figure 1a, page 7.
To determine if the space is large enough to qualify:
volume is 50 x 100 = 5,000 cubic feet. At a ceiling height of 8 feet, the
space must have at least 5,000 ÷ 8 = 625 square feet (25 feet x 25 feet,
for instance).
Part Number 550-101-009/0107
of openings — the minimum areas
(see defini-
Unusually tight construction
buildings in which:
a. Walls and ceilings exposed to the outside atmo-
sphere have a continuous water vapor retarder with
a rating of 1 perm or less with openings gasketed,
and . . .
b. Weather-stripping has been added on openable
windows and doors, and . . .
joints around windows and door frames, between
sole plates and floors, between wall-ceiling joints,
between wall panels, at penetrations for plumbing,
electrical, and gas lines, and in other openings.
For such construction cases, if appliances use inside air
for combustion,
. Size and locate these openings per the
appropriate case in
Exhaust fans and air movers
The appliance space must never be under a negative
pressure, even if the appliance(s) are installed as direct
vent. Always provide air openings sized not only to the
dimensions required for the firing rate of all appli-
ances, but also to handle the air movement rate of the
exhaust fans or air movers using air from the building
or space.
Motorized air dampers
If the air openings are fitted with motorized dampers,
electrically interlock the damper to:
fully open.
ing boiler operation.
-
To accomplish this interlock, wire an
(proving the damper open) in series with the thermo-
stat input to the boiler. The boiler will not start if this
contact is open, and will shut down should it open
during operation.
on page 10.
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