Running it "dry" while the engine is running will burn thru the copper line quickly. Adjusting the "Y" valves provides a positive pressure thru the heater coil at all times. Remember that cold water line suggested for blaster use above? It really needs to be connected to the "Y" connector with your hot water line at the top of the surge tank. Connect to the highest point on your surge tank via another "Y" connector. The discharge line from your heater coil must be heat resistant hose (think washing machine hose again). The most necessary part of your heater system is the surge tank. Use swage or flare fittings to attach hose bib connectors to both ends of the heater coil. (this is usually easier to do with a fresh piece of flat stock rather than piece the original back into place). Install heater coil and reweld the end plate. Drill 2 holes to accommodate input and exit of copper water lines. Remove the end of the exhaust that lacks the exhaust port. You should be able to blow freely thru it when finished. After coiling the tubing, hammer it against a solid surface and rotate while pouring to remove all the sand. The sand keeps from crimping the tubing excessively while wrapping. Wrap the stoppered tubing around the smallest mandrel that you can find (I usually start with 1.5 inch wooden dowel). Stopper one end of the tubing and fill from the other end with dry sand. It will serve, after a fashion, but the heat recovery is sorely lacking. Putting the tubing on the outside is simply not acceptable. For more divers, you will be better served with 1/2 inch tubing (same length). The other half of the "Y" can be used to supply a blaster nozzle.įor the heater portion, you can get by with 25 feet of 3/8 copper (enough for 1-2 divers). A short water hose should be connected to one side of the "Y", making certain to use a hose washer/strainer just like the one on the back of your washing machine. You need one with a shut-off on each side. Start with a simple "Y" connector at your pump. All of this is good information, but let's see if an old-time dredger can set you straight.
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