Patterson-Kelley Thermific, Инструкция по установке и эксплуатации

Страница: 11 / 46

Thermific
®
Gas-Fired Boiler Installation
Page 7
starting the boiler, check to ensure that the proper
voltage and amperage is connected to the boiler.
An external electrical disconnect (not supplied with
the boiler) with adequate overload protection is re-
quired. The boiler must be grounded in accordance
with local codes or in the absence of such require-
ments, in the U.S. with National Electrical Codes,
ANSI/NFPA No. 70 latest edition and in Canada, wire
according to the current Canadian Electrical Code.
Note: A dedicated earth ground (green wire) is re-
quired to avoid nuisance shutdowns. Do not ground
through the conduit. It is also important that proper
polarity be maintained.
3.5 C
OMBUSTION
A
IR
Combustion air must be free from dust, lint, etc. The
presence of such materials in the air supplied to the
burner could cause nuisance "Low Air" shutdowns or
premature burner failure. The boiler should not be
operated during construction while the possibility of
drywall dust, demolition dust, etc. exists.
Provisions for combustion and ventilation air must be
in accordance with Section 5.3, Air for Combustion
and Ventilation, of the National Fuel Gas Code, ANSI
Z223.1, latest edition, or applicable provisions of the
local building codes. In Canada, combustion air open-
ings shall comply with CSA 4.9. The formula is "1 sq.
in. per 1,000 Btu/hr of gas input not less than 100 sq.
in." The location shall be "neither more than 18," nor
less than 6" above the floor level.
The boiler room shall be provided with two openings
to ensure adequate combustion air and proper ventila-
tion. One opening should be 6 to 12 inches above the
floor and the other 6 to 12 inches below the ceiling,
preferably on opposite walls. The size of each open-
ing is determined by whether air is taken from inside
or outside the building. In Canada, ventilation air
openings shall be at least 10% of the cross sectional
area required for combustion air, but not less than 10
square inches. It is to be located at the highest practi-
cal point communicating with outdoors.
If air is taken directly from outside the building, each
opening should have a net free area of 1 square inch
for each 4,000 Btu per hour of total boiler input. For
instance, 300 square inches (2-1/12 square feet) are
required for 1,200,000 Btu per hour input.
When air is taken from the outdoors through a vertical
duct, 1 square inch per 4,000 Btu per hour is required.
If a horizontal duct is used, 1 square inch per 2,000
Btu per hour is required, i.e., 600 square inches for
1,200,000 Btu per hour input.
If air is taken from another interior space, each open-
ing should have a net free area of 1 square inch for
each 1,000 Btu per hour of boiler input (1,200 square
inches for a 1,200,000 Btu per hour.)
WARNING!
Under no circumstances shall the boiler room ever be
under a negative pressure. Particular care should be
taken when exhaust fans, compressors, air-handling
units or other equipment may rob air from the boiler.
The combustion air supply must be completely free of
chemical fumes which may be corrosive when burned
in the boiler. Common chemicals which must be
avoided are fluorocarbons and other halogenated com-
pounds, most commonly present as refrigerants or sol-
vents, such as freon, trichlorethylene, perchlorethyl-
ene, chlorine, etc. These chemicals, when burned,
form acids which quickly attack the boiler tubes, tube
sheets, flue collectors and the boiler stack. The result
is improper combustion and premature boiler failure.
3.6 F
LUE
V
ENTING
For boilers connected to gas vents or chimneys, vent
installations shall be in accordance with Part 7, Vent-
ing of Equipment, of the National Fuel Gas Code,
ANSI Z223.1, or applicable provisions of the local
building codes.
This boiler is certified as Category I as it is defined in
ANSI Z21.13/CSA 4.9, latest edition. This boiler is
suitable for use with Type "B" vent.
In Canada, the boiler is certified for installation with a
"Power Venter" by the Canadian Gas Association
when installed with the "listed accessories." Consult
your local distributor for information on proper selec-
tion.