MACH® Series
Gas-Fired Boiler
Installation
Page 7
requires less than 15 amps. Before starting the boiler,
check to ensure that the proper electrical service is
connected to the boiler.
An external electrical disconnect (not supplied with
the boiler) is required. The boiler electrical service
must be installed and grounded in accordance with
local codes or in the absence of such requirements, in
the U.S. with National Electrical Codes, ANSI/NFPA
No. 70 latest edition or, in Canada, to the Canadian
Electrical Code, Part I, CSA C22.1, latest edition.
Conduit must be installed vertically so that the side
doors can be opened.
Note:
A dedicated earth ground (green wire) and
neutral is required to avoid nuisance shutdowns. Do
not ground through the conduit. It is also important
that proper polarity be maintained.
Note:
Refer to electrical wiring section for terminal
block assignments (Section 6.1).
Customer Connections for the Boiler
Viewed from Front of Boiler.
3.5
C
OMBUSTION
A
IR
Note: Additional information is contained in the
venting supplement “MACH-07VG”.
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.
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
compounds, most commonly present as refrigerants
or solvents, such as freon, trichlorethylene,
perchlorethylene, chlorine, etc. These chemicals,
when burned, form acids which quickly attack the
boiler and the boiler stack. The result is improper
combustion and premature boiler failure.
Provisions for combustion and ventilation air must be
in accordance with Section 9.3, 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 openings shall comply with CSA B.149
Installation Code.
3.5.1 Air Inlet Requirements
Caution.
The boiler room should not be at a negative
pressure. Particular care should be taken when
exhaust fans, compressors, air-handling units or
other equipment may rob air from the boiler.
Combustion air may be supplied from within the
building or from outdoors. The minimum required
volume of the mechanical room and connected spaces
is 50 cu. Ft. per 1000 Btu/hr (4.8 m
3
/kW). If this
volume is not available, air must be taken from
outdoors.
When air is supplied from inside the building, the
total required volume shall be the sum of the required
volume for all the appliances located in the
mechanical room. Adjacent rooms furnished with
fixed openings communicating directly with the
mechanical room are considered part of the required
volume.
Openings used to connect indoor spaces to obtain the
required minimum volume shall be sized as follows:
•
When rooms are on the same floor, each opening
shall have an area equal to 1 square inch for each
1000 Btu/hr (2200 mm
2
/ kW) of installed
appliance input capacity, but not less than 100
square
inches. One opening should be less than
12 inches above the floor and the other less than
12 inches below the ceiling. The minimum
dimension of air openings shall be 3 inches.
Low Voltage
Junction Box
120 Volt
Junction Box
Содержание MACH C1500
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