Cleaning Coils- This time, the deep coils

[mixsit]

http://hvac-talk.com/vbb/showthread.php?t=787212
The previous thread had a lot of good opinions regarding pressurized sprayers, vs. a good nozzle and moderate pressure.
I've never used a pressure sprayer but I'm curious how the method compares purely on effectiveness in getting solids out and through large coils? (You know the stumper. Rinse and rinse and the tufts of dirt still come.. :bump:

My instinct says high(er) pressure is higher velocity = good agitation.
But a more or less solid ¼ stream (lower pressure) might do more work deeper.
This is sort of an impedance issue here isn't it.:grin2:

Too many variables to be sure, and not expecting the definitive answer. But I'm presuming (apples for apples) that it takes a given amount of flow through, plus varying attack angles to get past offset tube rows, to move dirt.
So let's say 'split coils, adequate city water/availability issues aside, moving imbedded dirt and fiber out of thick coils is the question.

:whistle:

[buildingengineer]

My experience, the lower pressure electric sprayers work well, Kracher, ect.

[jpsmith1cm]

For "split" coils, all that is really required is a hose. Once you 'unsplit' them, they are single layer, single pass coils and are very easy to clean.

Now, thick, "slab" type coils are a different matter entirely. The equipment that you see on larger air cooled equipment like racks and large air cooled AC units may have a single slab condenser that is many inches thick.

We use a combination of detergent (calclean) and a pressure washer to clean them.

[flange]

I like foaming cleaner, and spraying reverse of the air stream, but NO solid streams to prevent coil damage, especailly for novices.