"trader_4" wrote in message
...
On Monday, February 11, 2019 at 2:35:41 PM UTC-5, Rod Speed wrote:
"trader_4" wrote in message
...
On Monday, February 11, 2019 at 8:39:09 AM UTC-5, TimR wrote:
On Wednesday, February 6, 2019 at 3:16:22 PM UTC-5, Scott Lurndal
wrote:
A dirty filter:

1) Reduces the airflow available to the heat exchanger. This
could
result
in the high-limit switch opening, which will increase the cycle
time
(and blow colder air util the high-limit switch closes after
the
heat
exchanger cools sufficiently, rinse and repeat).

2) Causes the blower to work harder, which consumes additional
power
and
prematurely ages the blower.

A dirty filter does a couple of things.

It reduces air flow, perhaps very slightly to a lot.

It increases the efficiency of filtration. Dirty filters catch more
dirt
and work better, up to the point where reduced air flow becomes a
problem.

If you reduce airflow enough, you might have coil freezeups or other
problems. Residential systems tend to need a steady airflow across
the
coil, balanced to the temperature and the amount of charge. The old
ones
aren't intelligent enough to adjust, I dunno about more recent ones.

If your filter is dirty enough, theoretically it might rupture and
spill
unfiltered air into the equipment. The purpose of a filter is mainly
to
protect the equipment, not the humans. I haven't seen this happen in
a
residential system but I have in a commercial one. So I don't know if
that's really a problem in a house.

I change my filter when I hear the sound in the return increase.
That's
probably about 3 months or so, I don't keep track. I just cleaned my
refrigerator coils last night, they were caked with dust. (I have
that
stupid double A coil setup, where you can only reach the outer two
rows.)



I wonder why the refrigerator companies haven't designed in a filter?
Same problem here, the coils are tucked underneath, you can't get to
anything
more than the front of it to try to clean it. Not only would it be of
benefit to us, but it would be another revenue source for the
companies,
selling the replacement filters. These suck in air at the worst place,
right at the floor surface where they pull in dust, pet hair, etc and
get dirty fast.

In reality you dont get an accumulation of muck around the fridge
compressor,

Compressor? It's the condenser coils fool.

Thats part of the compressor, ****wit.

essentially because air isnt blown over the exposed coils at the
back of the fridge or freezer, they are cooled by convection.

Maybe on your old hillbilly fridge.

Nothing hillbilly about my fridge or freezer. They are
the latest pigeon pair, biggest you can buy, frost free.

On my modern fridge, like the other poster has too, the
condenser coils are underneath and they use a fan to
draw air over it. Even basic cheap fridges and freezers don't
have exposed coils in the back anymore. That's so 60s.

Still dont have a filter on the fan.

Or on the fan that blows freezing air into the fridge
or freezer with a frost free either and you dont get
any dirt blown into the fridge or freezer.

You dont get an accumulation of muck even with frost free fridges and
freezers which blow the cold air thru the inside of the fridge or
freezer.

The cold air path isn't the issue, fool.

Keep this **** up and your **** will be flushed where it belongs, ****wit.

It's the ambient air being drawn over the condenser coils.

But the same argument on the need for a filter applys even more
to the air blown into the fridge or freezer with a frost free, ****wit.

The most you get with my fridge in very humid weather is a bit of
a burble when you close the door due to the feed of the water that
is condensed out of the air before the air is moved into the body
of the fridge being under the water surface in the bowl on top of the
compressor where it evaporates due to the compressor waste heat.

Burbles? Must have missed your meds again.

What else are you going to call that, ****wit ?
Its rather more than just a bubbling noise
because its a much bigger pipe that resonates.