ASI's Gas Furnace Tips on Preventing a Cracked Heat Exchanger
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Preventing Cracked Heat Exchangers in Gas and Oil Furnaces
Homeowners can help prevent failure of their oil or gas furnace heat exchanger by simply maintaining their system regularly. This includes having an annual inspection of the system which should always including cleaning of the blower and cabinet. More importantly the homeowner needs to make sure that they maintain and clean or change their system air filters.Air Filters are important because as they get dirty they reduce the air flow significantly and this reduced air flow causes the heat exchanger itself to get much hotter because there is less air to transfer the heat. The heat exchanger is under tremendous stress, it is constantly being heat to a high temperature and cooled back down in a constant cycle.
This heating and cooling expands and contracts the metal countless times causing metal fatigued over the lifetime of the system. While they are designed to handle this extreme expansion and contraction they are designed with limits to just how hot they can get and when the air flow is reduced by clogged filters or improper installation practices the metal expands beyond it's design tolerance.
Every newer gas furnace has a temperature sensor built into the system that will shut down the furnace when it exceeds the high limit air temperature inside the unit at the heat exchanger. Many of these automatically reset and allow the furnace to start and run again after it cools back down. This causes your system to short cycle and prevents the user from knowing that there is an issue.
These high limit temperature sensors are also prone to failure the more times they trip out on high limit and become unstable. Under these conditions these sensors should be replaced to prevent premature failure of the heat exchanger. Proper maintenance and servicing of your system goes a long way towards getting the expected lifetime out of your system and return on your investment.
ASI's Heating Related Articles
  If
your Gas Furnace is an older gas furnace (usually 10 plus years old) it
may have a standing pilot light like a water heater, if this is the
case carefully follow the instructions on the furnace to light the
pilot. Some models have an intermittent pilot light or spark ignition
and you can usually hear the the system try to light the pilot flame
with a spark .. |
  Maintaining
your gas heating furnace system is important both to help make the
system last longer and to help keep the operating costs as low as
possible. All furnaces should be cleaned and inspected annually and
there are some things you can do yourself to save money but everyone
should call a qualified technician to inspect the system every fall as
well as to make any necessary repairs. |
  The
first thing that must happen is that the control thermostat must
provide a voltage signal to the furnace heating unit. The thermostat can
be most understood as simply a switch that turns a low voltage 24 volt
power on and off to the respective terminals. In the case of the
thermostat calling for heat the thermostat switches on the .. |
  Homeowners
can help prevent failure of their oil or gas furnace heat exchanger by
simply maintaining their system regularly. This includes having an
annual inspection of the system which should always including cleaning
of the blower and cabinet. More importantly the homeowner needs to make
sure that they maintain and clean or change their system air filters |
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Breaking News: The Cost to Repair your old Air Conditioner just Skyrocketed
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Copyright 2011. ASI Heating and Cooling a Division of Ameri-Serv, Inc. All rights reserved