What is the sequence of failure when an AC filter is not changed, left to
clog up, and the system fail? Can someone who knows AC explain how this
works through the components.

Steve

On Jun 13, 8:32*pm, "SteveB" wrote:
What is the sequence of failure when an AC filter is not changed, left to
clog up, and the system fail? *Can someone who knows AC explain how this
works through the components.

Steve

I do not work with AC but I might be able to answer your question.
Inside air is moved by the blower over the cooling coils and into the
rooms.
If the filter is clogged then the air will not move freely and the
blower will have to work
harder making it susceptible to damage. As the air moves over the
cooling coils
heat is absorbed by the coils preventing them from freezing. If the
air flow is restricted
then there is a chance the coils will ice up further restricting the
flow of air and not
able to provide the volume to cool down your place.

On a fairly ordinary central AC, the clogged air filter reduces air
flow (of course). The thermostat isn't satisfied, so the system runs
all the time. Since there is less air movement, the blower runs under
less load, but runs more hours. On most sytems, the cooling action in
the indoor coil continues, and eventually, the coils freeze. Since the
system is moving less BTU per hour, the load on the compressor is
lower.

Eventually, the refrigerant system is working, more hours but less
hard.

--
Christopher A. Young
Learn more about Jesus
www.lds.org
..


"SteveB" wrote in message
...
What is the sequence of failure when an AC filter is not changed, left
to
clog up, and the system fail? Can someone who knows AC explain how
this
works through the components.

Steve

Stormin Mormon wrote:
On a fairly ordinary central AC, the clogged air filter reduces air
flow (of course). The thermostat isn't satisfied, so the system runs
all the time. Since there is less air movement, the blower runs under
less load, but runs more hours. On most sytems, the cooling action in
the indoor coil continues, and eventually, the coils freeze. Since the
system is moving less BTU per hour, the load on the compressor is
lower.

Eventually, the refrigerant system is working, more hours but less
hard.


Sounds reasonable. The suction pressure drops. If it gets below
atmospheric pressure it could suck in moisture, but not unless there is
a leak. Systems may cycle on a low pressure limit.

Doesn't sound to me like a good sabotage method.