This article explains how easy it is to have all nozzles outputting at an "Optimum Misting Pressure" to achieve fantastic mosquito killing effectiveness. All information contained assume a 10 ft nominal distance between nozzles.
Rule #1 Pump pressure at the system should be adjusted to 250 psi, never higher. The factory presets the pump for a 40 nozzle system. If necessary, adjust pump pressure by turning a screw in a small port located at the bottom of the left side -- near the corner of the unit. The port may be covered by a cap (plug), just remove and replace when done. Use a flathead screwdriver, turning clockwise to increase pressure and counter clockwise to reduce pressure.
Rule #2 For best result we want to ensure nozzles operate in the Target Misting Zone, between 200 to 250 psi outputting 40-50 ml per minute. I know it sounds scary technical, but it's easy, read on. This happens automatically in smaller circuits of less than 36 nozzles (if spaced roughly 10 ft apart). For larger installations, simply respect a few guidelines below.
If desired, checking pressure at nozzle locations may be done with a pressure testing gauge. If you need a pressure gauge buy one here. We include one in all our 50 nozzle, or larger, kits.
Guideline #1 On a single run of nozzles, limit the nozzle count to no more than 35. There are optional layouts for over 35 nozzles... continue reading.
Guideline #2 A first option is to divide the flow. Tee the nozzle circuit as close as possible to the system unit so as to divide the flow. This is to say positioning the unit somewhere in the middle of the circuit if possible. This layout allows TWO runs of 30-35* nozzles as described above resulting in two “branches” for a total of 60-65* nozzles. Multiple branching is good, but keep the total count to 60-65* or less. Additional branching (dividing the flow) is always good as long as total nozzle-count is respected.
Guideline #3 A second option is to create a looped nozzle circuit. This would also be an optimum solution in Guideline #2 when the branches of the circuit are very different in length and nozzle count.
Guideline #4 If neither #2 or #3 are a good solution for you -- then using a 3/8” trunk-line to boost the pressure at the middle of the run is the answer. If you need to do this we've made a kit for this situation, called our Big Circuit Kit. The kit has the fittings and 3/8 tubing needed to branch off the main nozzle circuit right at the system and tie back in near the center of the nozzle circuit. (NOTE: The 3/8 tubing can be run directly to the mid-point -- or follow the path of the nozzle circuit before it ties back in; running parallel is shown.)
Guideline #5 For distances over 25-30 feet WITHOUT nozzles, bump up to 3/8” tubing instead of standard 1/4” tubing. This prevents friction loss from killing your nozzle circuit pressure. We made a kit for this situation, called the Long Run Kit. Be sure to select the needed length.
Guideline #6 If planning OVER 65-70* nozzles up to a maximum of about 120-130* nozzles buy an ADDITIONAL ZONE. Then you'll be able to create TWO nozzle circuits (Zones) with ONE MACHINE for a total of about 120-130* nozzles. Beyond 120-130* nozzles it is necessary to buy another misting system(s).
With this solution the nozzle circuit is split into two zones, the system first operates Zone 1, then mists Zone 2 in sequence. On each nozzle circuit follow the guidelines outlined above.
Guideline #7 To attain a mist volume of 40-50 ml per minute, keep your nozzle tips clean and in good condition. This is much easier since the introduction of the Nozzle Circuit Filter introduced in 2017. The nozzle circuit Filter is placed at the system unit and the filter element is replaced annually. We include one of these in every system kit we sell. If you bought your system elsewhere -- buy one here.
In summary, branching the nozzle circuit is always a good thing. If you need to split off the main run and put some nozzles in another area, that is fine. Just be sure to keep your total nozzle count true. A straight run is 35 max, a loop is 60-65* max, and even split is 30-35* per side for 60-65 max. All the above layouts assume a 10 ft distance between nozzles.
FINAL POINT: Do you really need to follow the guidelines? Maintaining adequate nozzle pressure by following these rules and guidelines ensures the misting plumes created will have the best effect while using the least amount of juice.
*Every installation is different, the bends, the ups & downs, actual distances between each nozzle, etc. Therefore it is necessary to give a range for total possible nozzles in many of the above explanations. Having slightly low pressure (below 200 psi) at the weakest nozzle is fine so don't fret. Just know that performance will suffer as one gets further and further away from the Guidelines. Even a poorly installed nozzle circuit will kill mosquitoes, just not as many or as effectively.