FOR FURNACES INSTALLED IN THE COMMON- WEALTH OF MASSACHUSETTS ONLY
For all side wall horizontally vented gas fueled equipment installed in every dwelling, building or structure used in whole or in part for resi- dential purposes, including those owned or operated by the Com- monwealth 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 require- ments 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
a.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.
b.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 mon- oxide detector with an alarm shall be installed.
2.APPROVED CARBON MONOXIDE DETECTORS. Each carbon monoxide detector as required in accordance with the above pro- visions shall comply with NFPA 720 and be ANSI/UL 2034 listed and IAS certified.
3.SIGNAGE. A metal or plastic identification plate shall be perma- nently 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 heat- ing 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 car- bon monoxide detectors and signage installed in accordance with the provisions of 248 CMR 5.08(2)(a)1 through 4.
INSPECTION
As soon as a unit is received, it should be inspected for possible dam- age during transit. If damage is evident, the extent of the damage should be noted on the carrier’s freight bill. A separate request for inspection by the carrier’s agent should be made in writing. Also, before installation, the unit should be checked for screws or bolts which may have loosened in transit. There are no shipping or spacer brackets which need to be removed from the interior of this unit.
FURNACE LOCATION AND CLEARANCES
The furnace shall be located using the following guidelines:
1.Where a minimum amount of air intake/vent piping and elbows will be required.
2.As centralized with the air distribution as possible.
3.Where adequate combustion air will be available (particularly when the appliance is not using outdoor combustion air).
4.Where it will not interfere with proper air circulation in the confined space.
5.Where the outdoor vent terminal will not be blocked or restricted. Refer to “VENT CLEARANCES” located in SECTION VII of these instructions. These minimum clearances must be maintained in the installation.
6.Where the unit will be installed in a level position with no more than 1/4” (6.4 mm) slope side-to-side and front-to-back to provide proper condensate drainage.
Installation in freezing temperatures:
1.Furnace shall be installed in an area where ventilation facilities pro- vide for safe limits of ambient temperature under normal operating conditions. Ambient temperatures must not fall below 32°F (0°C) unless the condensate system is protected from freezing.
Improper installation in an ambient below 32ºF (0.0° C) could create a hazard, resulting in damage, injury or death.
2.Do not allow return air temperature to be below 55º F (13°C) for extended periods. To do so may cause condensation to occur in the main heat exchanger, leading to premature heat exchanger failure.
3.If this furnace is installed in an unconditioned space and an extended power failure occurs, there will be potential damage to the internal components. Following a power failure situation, do not operate the unit until inspection and repairs are performed.
Liquid anti-freeze will cause damage to internal plastic parts of this furnace. DO NOT attempt to winterize the furnace using liquid anti-freeze.
Clearances for access/service:
Ample clearances should be provided to permit easy access to the unit. The following minimum clearances are recommended:
1.Twenty-four (24) inches (61 cm) between the front of the furnace and an adjacent wall or another appliance, when access is required for servicing and cleaning.
2.Eighteen (18) inches (46 cm) at the side where access is required for passage to the front when servicing or for inspection or replace- ment of flue/vent connections.
In all cases, accessibility clearances shall take precedence over clear- ances for combustible materials where accessibility clearances are greater.
Installation in a residential garage:
A gas-fired furnace for installation in a residential garage must be installed so the burner(s) and the ignition source are located not less than 18” (46 cm) above the floor, and the furnace must be located or protected to avoid physical damage by vehicles.
Table 1: Unit Clearances to Combustibles
Application | Upflow | Downflow | Horizontal |
Top | 1" | 0" | 0" |
Vent | 0" | 0" | 0" |
Rear | 0" | 0" | 0" |
Side | 0" | 0" | 1" |
Front* | 0" | 0" | 0" |
Floor | Combustible | Combustible1 | Combustible |
Closet | Yes | Yes | Yes |
Line Contact | No | No | Yes |
1. For combustible floors only when used with special sub-base.
*24" clearance in front and 18" on side recommended for service access. All furnaces approved for alcove and attic installation.
