next week if i have time i'll try and rig something up. Using the Wall paper steam end wand as a prototype attach 3-4 nozzles inside kind of like a water broom. 1 or 2 Delevan 5800 pumps feeding those nozzles would really pump the debris out nicely while keeping over spray contained. moving on to part 2 Reading about you running 300ft of hose inside , thats a pain in the a$$ and a risk factor. How about using a 5800 or fat boy pump mounted the a cart with a 75 gallon h20 tank plus 50ft of keritec hose . add a hudson float valve and 50ft of feed hose to keep production up. Add a 3 way valve for a chem line. The cart could possibly be loaded on a electric scooter or motor cycle trailer hitch platform with ramp for easy loading.. Most of the weight will be the batteries. or I might be nerding out a little much?? My wife would say "can you just paint the bathroom already"
This is like deja vu to me. I am like you. I am always looking for a better and more efficient way. You can ask Jerry or Paul, I'm always asking them to rig up something I think will work better.
In addition to your idea for the steamer (which we experimented with a few years ago) I also rigged up a similar setup that dispensed foam and forced it deep into the coils about one square foot at a time. It worked! But the trade offs, just like with the steamer, were just too much. I am the king of making things, that cost a lot to research, work on paper, then don't work so well in the real world.
Part 2: Rarely do we run 300 ft of hose through any area where there are people. Most large buildings have dedicated floors just for hvac or they are located on the rooftops. When air handlers are located in ceilings with catwalks we use portables provided by Jerry with electric shutoffs. I can't imagine moving around a 75 gallon tank. Sometimes there are places where you have to bring the unit up and over obstacles many times just to get to the unit. A 15 gallon tank is just about max a couple of guys can handle. What you are talking about would work great if the distance from flat ground wasn't over 2-300 ft at times.
3) While the proponents of high volume vs pressure like to believe that anything can be cleaned with low pressure, I can tell you from experience, there is nothing like the availability of at least 2000 psi to blast out the sides and corners of caked on gunk. Cleaning isn't just dependent on water volume, most cleaning requires agitation. That agitation comes from pressure. The availability of BOTH high volume AND pressure is the happy medium that gets jobs done fast. There is a company that cleans condenser coils with 90 gpm and up to 3500 psi. That is ok for cleaning condensers until you lose accounts for overspray blowing up fan motors. That kind of gpm would flood buildings if used to clean evaporator coils. I know for a fact that one could do maintenance cleaning on condenser coils using nothing but a fire hose hooked to a hydrant. They max out usually around 100 or so psi. It works, but it won't blast through caked on dirt like a 3500 psi blast will, it just gets it wet. There are lots of 500-700 psi coil cleaning units in production that HVAC companies use. I probably have one of each brand in my garage collecting spider webs. They work, especially if you are an hourly union worker. lol. But if your income depends on speed, accuracy, safety and thorough cleaning nothing beats the availability of high volume AND high pressure when needed.
In this video you can see the fan on the gun changing as I had a to change pressure to deal with bad spots at 1:08 - 1:25
And at 1:36 you can see what high pressure looks like when it's finally blasted through and is forcing it's way through the coil.
Low pressure can't do this, without flooding the building. This was taken before we had Jerry's vacuums. Now we don't have to slow down for the vacuum to keep up like we did in this video.
![1440519177327[1].jpg](http://propowerwash.com/board/upload/data/attachments/23/23298-aa08042856eed3e4d78d1e9c25e6cc6b.jpg "1440519177327[1].jpg")