MG3P Installation Manual

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placed on each floor level where there are bedrooms. The
detector shall comply with NFPA 720 (2005 Edition) and
be mounted in the living area outside the bedroom(s).
b.) A (CO) detector shall be located in the room that houses
the appliance or equipment and shall:
• Be powered by the same electrical circuit as the
appliance or equipment. Only one service switch shall
power the appliance and the (CO) detector;
• Have battery back-up power;
• Meet ANSI/UL 2034 Standards and comply with
NFPA 720 (2005 Edition); and Approved and listed
by a Nationally Recognized Testing Laboratory as
recognized under 527 CMR.
c.) A Product-approved vent terminal must be used, and
if applicable, a product-approved air intake must be
used. Installation shall be in strict compliance with the
manufacturer’s instructions. A copy of the installation
instructions shall remain with the appliance or equipment
at the completion of the installation.
d.) A metal or plastic identification plate shall be mounted at
the exterior of the building, four feet directly above the
location of vent terminal. The plate shall be of sufficient
size, easily read from a distance of eight feet away, and
read “Gas Vent Directly Below”.
2. For direct-vent appliances, mechanical-vent heating
appliances or domestic hot water equipment where the bottom
of the vent terminal and the air intake is installed above four
feet above grade the following requirements must be satisfied:
a.) A (CO) detector and alarm shall be placed on each floor
level where there are bedrooms. The detector shall
comply with NFPA 720 (2005 Edition) and be mounted
in the living area outside the bedroom(s).
b.) The (CO) detector shall:
• Be located in the room that houses the appliance or
equipment;
• Be hard-wired or battery powered or both.
• Shall comply with NFPA 720 (2005 Edition).
c.) A product-approved vent terminal must be used, and
if applicable, a product-approved air intake must be
used. Installation shall be in strict compliance with the
manufacturer’s instructions. A copy of the installation
instructions shall remain with the appliance or equipment
at the completion of the installation.
The information listed below is for reference purposes only
and does not necessarily have jurisdiction over local or state
codes. Always consult with local authorities before installing
any gas appliance.
Combustion & Ventilation Air
• US: National Fuel Gas Code (NFGC), Air for Combustion and
Ventilation
• CANADA: Natural Gas and Propane Installation Codes
(NSCNGPIC), Venting Systems and Air Supply for Appliances
Duct Systems
• US and CANADA: Air Conditioning Contractors Association
(ACCA) Manual D, Sheet Metal and Air Conditioning
Contractors National Association (SMACNA), or American
Society of Heating, Refrigeration, and Air Conditioning
Engineers (ASHRAE) Fundamentals Handbook
Electrical Connections
• US: National Electrical Code (NEC) ANSI/NFPA 70
• CANADA: Canadian Electrical Code CSA C22.1
Gas Piping & Gas Pipe Pressure Testing
• US: NFGC and National Plumbing Codes
• CANADA: NSCNGPIC
General Installation
• US: Current edition of the NFGC and the NFPA 90B. For
copies, contact the National Fire Protection Association Inc.,
Batterymarch Park, Quincy, MA 02269; or American Gas
Association, 400 N. Capitol, N.W., Washington DC 20001 or
www.NFPA.org
• CANADA: NSCNGPIC. For a copy, contact Standard Sales,
CSA International, 178 Rexdale Boulevard, Etobicoke
(Toronto), Ontario, M9W 1R3 Canada
Safety
• US: (NFGC) NFPA 54–1999/ANSI Z223.1 and the Installation
Standards, Warm Air Heating and Air Conditioning Systems
ANSI/NFPA 90B.
• CANADA: CAN/CSA-B149.1 and .2–M00 National Standard
of Canada. (NSCNGPIC)
Combustion Air Quality
CAUTION:
Combustion air must not be drawn from a
corrosive atmosphere.
To maximize heat exchanger life, the combustion air must be
free of chemicals that can form corrosive acidic compounds in
the combustion gases. The recommended source of combustion
air is to use outdoor air. However, the use of indoor air in most
applications is acceptable except as listed:
If outside air is used as return air to the furnace for ventilation or
to improve indoor air quality, the system must be designed so
that the return air is not less than 60° F (15° C) during operation.
If a combination of indoor and outdoor air is used, the ducts and
damper system must be designed so that the return air supply
to the furnace is equal to the return air supply under normal,
indoor return air applications.
• If the furnace is a single pipe installation and installed in a
confined space, it is required that the necessary combustion
air come from the outdoors by way of attic, crawl space, air
duct, or direct opening. See pages 7 - 9 for combustion
air requirements.
• Installations in these locations may require outdoor air for
combustion, due to chemical exposures:
Commercial buildings
Buildings with indoor pools
Furnaces installed in laundry rooms
Furnaces installed in hobby or craft rooms
Furnaces installed near chemical storage areas
• Exposure to the following substances in the combustion air
supply may require outdoor air for combustion:
Permanent wave solutions
Chlorinated waxes and cleaners
Chlorine based swimming pool chemicals
Water softening chemicals
De-icing salts or chemicals
Carbon Tetrachloride
Halogen type refrigerants
Cleaning solvents (perchloroethylene)
Printing inks, paint removers, varnishes, etc.
Hydrochloric Acid
Cements and glues
Antistatic fabric softeners
Masonry acid washing materials
Heating Load
This furnace should be sized to provide the design heating
load requirement. Heating load estimates can be made using
approved methods available from Air Conditioning Contractors of
America (Manual J); American Society of Heating, Refrigerating,
and Air Conditioning Engineers; or other approved engineering