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Requirements for installation – Commonwealth of Massachusetts
For all side wall horizontally vented gas fueled equipment installed in every dwelling, building or structure used in whole or in part for
residential purposes, including those owned or operated by the Commonwealth and where the side wall exhaust vent termination is
less than seven (7) feet above finished grade in the area of the venting, including but not limited to decks and porches, the following
requirements shall be satisfied:
1. INSTALLATION OF CARBON MONOXIDE DETECTORS. At the time of installation of the side wall horizontal vented gas fueled
equipment, the installing plumber or gasfitter shall observe that a hard wired carbon monoxide detector with an alarm and battery
back-up is installed on the floor level where the gas equipment is to be installed. In addition, the installing plumber or gasfitter shall
observe that a battery operated or hard wired carbon monoxide detector with an alarm is installed on each additional level of the
dwelling, building or structure served by the side wall horizontal vented gas fueled equipment. It shall be the responsibility of the
property owner to secure the services of qualified licensed professionals for the installation of hard wired carbon monoxide detectors.
-In the event that the side wall horizontally vented gas fueled equipment is installed in a crawl space or an attic, the hard
wired carbon monoxide detector with alarm and battery back-up may be installed on the next adjacent floor level.
-In the event that the requirements of this subdivision can not be met at the time of completion of installation, the owner
shall have a period of thirty (30) days to comply with the above requirements; provided, however, that during said thirty (30)
day period, a battery operated carbon monoxide detector with an alarm shall be installed.
2. APPROVED CARBON MONOXIDE DETECTORS. Each carbon monoxide detector as required in accordance with the above
provisions shall comply with NFPA 720 and be ANSI/UL 2034 listed and IAS certified.
3. SIGNAGE. A metal or plastic identification plate shall be permanently mounted to the exterior of the building at a minimum height
of eight (8) feet above grade directly in line with the exhaust vent terminal for the horizontally vented gas fueled heating appliance or
equipment. The sign shall read, in print size no less than one-half (1/2) inch in size, “GAS VENT DIRECTLY BELOW. KEEP CLEAR OF
ALL OBSTRUCTIONS”.
4. INSPECTION. The state or local gas inspector of the side wall horizontally vented gas fueled equipment shall not approve the
installation unless, upon inspection, the inspector observes carbon monoxide detectors and signage installed in accordance with the
provisions of 248 CMR 5.08(2)(a)1 through 4.
-EXEMPTIONS: The following equipment is exempt from 248 CMR 5.08(2)(a)1 through 4:
• The equipment listed in Chapter 10 entitled “Equipment Not Required To Be Vented” in the most current edition of
NFPA 54 as adopted by the Board; and
• Product Approved side wall horizontally vented gas fueled equipment installed in a room or structure separate from
the dwelling, building or structure used in whole or in part for residential purposes.
Special Installation Requirements
Installation Requirements—Massachusetts
Installation Requirements—High Altitudes
5. This appliance is equipped with an automatic combustion characteristic adjustment system, provided the installed elevation above
sea level is entered into the operating control when the elevation is greater than 2,000 feet and less than or equal to 19,000 feet. To
enter the operating elevation:
• From the setup menu, enter the password for the installer level or higher. Enter the parameters menu, then the altitude
parameter set. Enter the appropriate elevation for the installation.
• The adjusted altitude entered is internally converted to an offset on top of the maximum fan speed.
•
By adjusting the combustion characteristics as described above, there is no de-rate required at altitudes up to 19,000
feet. For elevations in excess of 19,000 feet or gas BTU content levels below 950 BTU/cubic foot, consult the Armstrong
Hot Water, Inc. for adjustments and de-rating information.