Section 385-890-F-III - Optional AppliancesA.Comfort cooling systems When not provided and installed by the home manufacturer, any comfort cooling systems that are installed must be installed according to the appliance manufacturer's installation instructions.
1.Air conditioners Air conditioning equipment must be listed or certified by a nationally recognized testing agency for the application for which the unit is intended and installed in accordance with the terms of its listing or certification (see part 3280.714):
a.Energy efficiency(i) Site-installed central air conditioning equipment must be sized to meet the home's heat gain requirement in Chapter 28 of the 1997 ASHRAE Handbook of Fundamentals (incorporated by reference) or ACCA Manual J, Residential Cooling Load, 8th edition (incorporated by reference).Information necessary to calculate the home's heat gain can be found on the home's comfort cooling certificate.(ii) The BTU/hr. rated capacity of the site-installed air conditioning equipment must not exceed the air distribution system's rated BTU/hr. capacity as shown on the home's compliance certificate.b.Circuit ratingIf a manufactured home is factory provided with an exterior outlet to energize heating and/or air conditioning equipment, the branch circuit rating on the tag adjacent to this outlet must be equal to or greater than the minimum circuit amperage identified on the equipment rating plate.
c.A-coil units(i) A-coil air conditioning units must be compatible and listed for use with the furnace in the home and installed in accordance with the appliance manufacturer's instructions.(ii) The air conditioner manufacturer instructions must be followed.(iii) All condensation must be directed beyond the perimeter of the home by means specified by the equipment manufacturer.2.Heat PumpsHeat pumps must be listed or certified by a nationally recognized testing agency for the application for which the unit is intended and installed in accordance with the terms of its listing or certification (See part 3280.714).
3.Evaporative Coolersa. A roof-mounted cooler must be listed or certified by a nationally recognized testing agency for the application for which the unit is intended and installed in accordance with the terms of its listing (Seepart 3280.714): (i) Any discharge grill must not be closer than three feet from a smoke alarm.(ii) Before field installing a roof mounted evaporative cooler on-site, the installer must ensure that the roof will support the weight of the cooler.(iii) A rigid base must be provided to distribute the cooler weight over multiple roof trusses to adequately support the weight of the evaporative cooler.b. An evaporative cooler that is not roof-mounted is to be installed in accordance with the requirements of its listing or the equipment manufacturer's instructions, whichever is the more restrictive.B.Fireplaces and Wood-Stoves When not provided by the home manufacturer, fireplaces and wood-stoves including chimneys and air inlets for fireplaces and wood stoves must be listed for use with manufactured homes and must be installed in accordance with their listings.
C.Appliance Venting1. All fuel burning heat producing appliances of the vented type except ranges and ovens must be vented to the exterior of the home.2. Upon completion, the venting system must comply with all requirements of 3280.707(b) and 3280.710 of the MHCSS.3. When the vent exhausts through the floor, the vent must not terminate under the home and must extend to the home's exterior and through any skirting that may be installed.D.Clothes Dryer Exhaust Duct SystemA clothes dryer exhaust duct system must conform with and be completed in accordance with the appliance manufacturer instructions and part 3280.708.The vents must exhaust to the exterior of the home, beyond any perimeter skirting installed around it, as shown in the Figure to Subchapter F, Section III.
Figure to Subchapter F, Section III - Optional Appliances: Dryer Exhaust System
Notes to Figure:
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1. Installation of the exhaust system must be in accordance with the dryer manufacturer instructions 2. Dryer exhaust system must not contain reverse slope or terminate under the home.02- 385 C.M.R. ch. 890, § F-III