3D"YORK,

Printed = from YORK=20 (www.YORK.com)

Manufactured Housing = Furnace
Inspection Program=20 Safety Notice

Safety=20 Bulletin

3D"Article Models : = Coleman,=20 Coleman Evcon, & Red T Model numbers, DGAT070xxx (70,000btuh = input)=20 & DGAT075xxx (75,000btuh input) natural and propane, = Manufactured=20 Housing gas furnaces, manufactured during 1997, 1998, & 1999.=20

Based on = several=20 reported premature heat exchanger failures on the above listed = furnaces in=20 Alberta, Canada, the Alberta Canada Municipal Affairs, Safety = Services=20 Agency issued a January 30, 2002 Consumer Advisory, advising that = furnaces=20 installed in the Alberta province, be inspected and serviced by a=20 qualified person. Furnaces involved were found to have heat = exchanger=20 cracking, burn through, and in extreme cases, furnace wrapper burn = through.

These = situations, if=20 left unresolved, can lead to significant property damage, personal = injury=20 and/or death.

Since the = publication=20 of the Consumer Advisory, YORK has initiated extensive field and = factory=20 testing. In all cases, testing revealed that pre-mature = heat=20 exchanger cracking, burn-through and furnace wrapper burn through = are not=20 a result of furnace manufacturing quality, or design, but instead, = a=20 direct result of the following installation and/ or application = related=20 issues:

Furnace heat = exchanger=20 temperature rises that are significantly above the 45-75=B0F = temperature=20 rise data published on the DGAT furnace rating plate.
=20
Restricted indoor = blower=20 airflow as a result of high external duct system and filter = static=20 pressures. Many installations with cracked heat exchangers were = observed=20 to have high static HEPA, or Electro-Static, after-market air = filters=20 installed. In addition, many furnaces with cracked heat = exchangers were=20 installed on very small, restricted ductwork. The small ductwork = itself=20 can be restrictive enough to cause the furnace to operate above = its=20 listed maximum static rating.

U.S. Manufactured Housing=20 Manufacturer=92s are required in new construction to have duct = systems=20 pass HUD duct design requirements, which state that the total = duct=20 external static pressure can not exceed 90% of the furnace = nameplate=20 external static pressure requirement. Canadian Manufactured = Housing=20 Manufacturers presently are not presently required to comply = with this=20 HUD-type requirement.

Older Manufactured Housing = retrofits=20 frequently have overly restrictive ductwork as well, and this=20 installation condition must be addressed by the installation=20 contractor.
Furnace input = over-firing,=20 based on manifold pressure settings and installation. Furnace = inputs=20 must always be de-rated by orifice change, for elevations above = 2,000=20 ft. above sea level.

To assist = technicians=20 in the furnace inspection process, YORK has developed and = distributed a=20 detailed DGAT070 & DGAT075 service inspection sheet. This = inspection=20 sheet specifically guides the technician on heat exchanger = inspection, as=20 well as guides the technician on a step-by-step inspection of the = three=20 potential furnace installation problem areas listed=20 above.

If a heat = exchanger=20 is found to be cracked, it is very important that an inspection of = the=20 installation be performed, BEFORE a heat exchanger or the furnace = is=20 replaced. Failure to do so, can lead to rapidly re-occurring heat=20 exchanger failures, significant damage to property, personal = injury,=20 and/or death.

Mandatory = furnace=20 de-rating may be necessary to compensate for high altitude, or = overly=20 restrictive manufactured housing ductwork to allow furnaces to = comply with=20 published 45-75=B0F heat exchanger temperature rise=20 data.

For more=20 information Canadian consumers can contact our YORK Toronto Office = at=20 1-800-668-2389. Consumers in the U.S. can contact the = Coleman/Stylecrest=20 Technical Service Group at 1-800-228-7896.

3D"YORK,

Printed = from YORK=20 (www.YORK.com)

Manufactured Housing = Furnace
Inspection Program=20 Safety Notice

Safety=20 Bulletin

These = situations, if=20 left unresolved, can lead to significant property damage, personal = injury=20 and/or death.

Furnace heat = exchanger=20 temperature rises that are significantly above the 45-75=B0F = temperature=20 rise data published on the DGAT furnace rating plate.
=20
Restricted indoor = blower=20 airflow as a result of high external duct system and filter = static=20 pressures. Many installations with cracked heat exchangers were = observed=20 to have high static HEPA, or Electro-Static, after-market air = filters=20 installed. In addition, many furnaces with cracked heat = exchangers were=20 installed on very small, restricted ductwork. The small ductwork = itself=20 can be restrictive enough to cause the furnace to operate above = its=20 listed maximum static rating.

U.S. Manufactured Housing=20 Manufacturer=92s are required in new construction to have duct = systems=20 pass HUD duct design requirements, which state that the total = duct=20 external static pressure can not exceed 90% of the furnace = nameplate=20 external static pressure requirement. Canadian Manufactured = Housing=20 Manufacturers presently are not presently required to comply = with this=20 HUD-type requirement.

Older Manufactured Housing = retrofits=20 frequently have overly restrictive ductwork as well, and this=20 installation condition must be addressed by the installation=20 contractor.
Furnace input = over-firing,=20 based on manifold pressure settings and installation. Furnace = inputs=20 must always be de-rated by orifice change, for elevations above = 2,000=20 ft. above sea level.