Terry wrote:

On Mon, 19 Jun 2006 15:29:04 GMT, "Pete C."
wrote:

Terry wrote:

On Sun, 18 Jun 2006 15:48:02 GMT, "Pete C."
wrote:

Toller wrote:

"STravis" wrote in message
oups.com...

When deciding between going with an electronic filter vs filter media
(assuming cost isn't an issue) which would be better. I've seen how
electronic filters are built and I would think that they provide less
restriction. However, I've been told the opposite - that filter media
provides less restriction than electronic filters... Is that true?

Unless they clean a whole lot easier than do the ones I got 10 years ago,
you would have to be crazy to buy an electronic filter. I pulled mine and
use a pleated filter instead.
Not only are they difficult to clean and expensive, but expensive to fix.

Not sure which type you had, but most are extremely easy to clean. You
pull the collector grids and either hose them down outside, or just run
them through the dishwasher. Super easy, just have to make sure they are
dried completely before putting them back.

In the middle of a new england winter, hosing them down outside is not
realistic. Putting them thorugh the dishwasher works, but only one wil
fit in ours at a time, and there are two of them, so you have to run
two cycles through the dishwasher. After two cycles you have to wait
for the second one to dry. Not difficult, I agree, but annoying, and
while you're doing this you are running the furnace without an air
cleaner.

Perhaps an earlier design unit, the newer ones seem to be designed to
fit the dishwasher ok. A rinse in the bathtub or laundry sink is also an
option.

When the grids are out for cleaning you should never be operating
without a filter, there should always be a basic media type pre filter
in the system. An EP is not a replacement for that pre filter.

Sure, but you have to clean the pre-filter too. At least you do on our
system, they are an aluminum mesh that you rinse out.

As for fixing, there is little to fix on one. It's just a HV power
supply and a collection grid. Considering the power supply is little
different than a neon sign transformer and those last decades without
failures there is little reason that a quality EP unit should ever need
service in any reasonable lifetime.


I had a Honeywell electronic air cleaner, dates from about 1987. It
has a little sensor that detects air flow in the furnace output. That
way the air cleaner turns itself on and off without tieing into the
furnace fan circuit. When that detector board failed, all you could
do was replace it -- for a cost of $500.

A poor design. An airflow paddle switch, a differential pressure switch
or a sense line to the fan circuit would all be better. There is also
minimal reason not to just leave the unit powered full time as they
consume little power.


I can get good pleated filters that fit in the Honeywell air cleaner
"slot", and that's what I use now. Changing them once a year takes
about 1 minute.

Filters should be changed more than once a year unless you're in a
climate with minimal heating and cooling requirements and you indicated
new england which has substantial HVAC requirements.

OK. I certainly don't have to replace them as often as I had to clean
the electronic filters, and their prefilters.

Another disadvantage of electronic air cleaners is the "snapping"
noise that they make when they run. If you have a bedroom right over
the furnace, you can hear this and it's pretty annoying.

That snapping should be almost non existent if you have a proper pre
filter before the EP. An EP does not "snap" in normal operation, it only
snaps when a large piece of debris bridges the collection grids and
debris that large would never make it past a proper pre filter. It
sounds like your system was not properly configured.


I'm not an expert, but this is my experience. And yes, the system does
have pre-filters. The snapping would be the worst just after cleaning,
then it would get less as the filters got dirtier.

Terry

Odd, I'm not an expert either, but I have some experience with a couple
air handlers with EPs at a place I used to work. They were moderate
sized Carrier units, not really larger than you would have serving a
home since they were serving a couple thousand sq. ft. of office area. I
don't recall hearing much snapping ever, and they were doing their job
as the grids would buildup a good load of crud.

Pete C.