
3.0 Desired UV Unit Flow Rates – Ponds
Note: Multiple EP units can be used for flow rates beyond those specified herein. (See Sec. 17.7) - Do not exceed
8ft/sec flow rate for your piping.
4.0 Desired UV Unit Flow Rates – Swimming Pools, Fountains, Water Features
Note: Multiple EP units can be used for flow rates beyond those specified herein. (See Sec.17.7) - Do not exceed
8ft/sec flow rate for your piping.
Sizing Chart Notes: The GPM/LPM flow rates shown are to illustrate the maximum bacteria killing capacity of the UV
unit. In practical application, the flow rates through your plumbing system should not exceed 8ft/sec. - By maintaining
your flow rate at or below the maximum flow rates shown, you will achieve the same killing power output in micorwatts/
sec/cm
2
as used by Public Health officials worldwide for potable drinking water. Upsizing your unit to the next larger
size further improves the sanitation achieved without much appreciable increase in purchase cost, when used with a
lower output pump.
5.0 Installation - Before starting your installation, PLEASE read this manual cover to cover. A few moments spent
initially becoming totally familiar with the EP unit and its installation will save wasted time (and expense) later on. If
you have any questions that are unanswered when you have completed the reading of this manual, contact your
supplier or Delta UV to get the answers you need before going forward and creating a problem later on by proceeding
incorrectly. We want to have your installation meet your expectations and operate properly and are ready to assist
you at any time.
5.1 Locating The UV Unit - Once you have confirmed the sizing of your pond or pool and compared that
information against the requirements of your EP UV unit by using the charts above, it is now time to install
your unit. The EP unit comes with all internal components fully assembled and ready for installation. Only
the Inlet/Outlet unions and pressure gauge need to be installed to ready your unit for installation. The housing
of the EP UV unit is stainless steel and the electrical enclosure bonnet is UV inhibited ABS plastic. Thus,
your unit will function fine in the outdoors. Installing the EP unit indoors or inside a covered area is preferred,
however, to keep your unit looking new. The EP unit will need to be powered from a 120 V/15A electrical
outlet. If the outlet is outdoors and open to the weather, it will need to be an Outdoor type receptacle. The EP
unit comes with an eight foot power cord. Do not use an extension cord unless it is at least a 16/3 size
conductor waterproof type and is no longer than twenty five (25) feet long.
Note: 240V / 50/60HZ units are available - Contact your dealer for more information.
5.2 Plumbing The UV Unit – Plumbing Diagram and Bypass Diagram - Your EP unit will next need to be
plumbed into your pond or swimming pool circulation system. The diagram (Fig. 1) shows how the unit is to
be plumbed. Note that the water is to be piped from the pressure side of the pump and after the filter, in and
out of the EP unit. The inlet for the water is at the bottom of the EP unit, and the outlet is at the top of the EP
unit. If your pump exceeds the maximum flow rate of the EP unit, installation of a plumbing by-pass will be
6
Delta UV Maximum Maximum Minimum UV Max Volume Max Volume Max Volume Max Volume
EP UV Flow Rate Flow Rate Microwatts 12 Hr. Turnover 12 Hr. Turnover 8 Hr. Turnover 8 Hr. Turnover
Model (GPM) (LPM)
sec/cm²
(Gallons) (Liters) (Gallons) (Liters)
EP-5 31 117 30290 22320 84490 14880 56327
EP-10 63 238 30840 45360 171706 30240 114470
EP-20 88 333 30290 63360 239843 42240 159895
EP-40 100 379 30980 72000 272549 48000 181699
Delta UV Maximum Maximum Minimum UV Max Volume Max Volume Max Volume Max Volume Max Volume Max Volume
EP UV Flow Rate Flow Rate Microwatts 2 Hr. Turnover 2 Hr. Turnover 3 Hr. Turnover 3 Hr. Turnover 4 Hr. Turnover 4 Hr. Turnover
Model (GPM) (LPM)
sec/cm²
(Gallons) (Liters) (Gallons) (Liters) (Gallons) (Liters)
EP-5 31 117 30290 3720 14082 5580 21123 7440 28163
EP-10 63 238 30840 7560 28618 30240 114470 15120 57235
EP-20 88 333 30290 10560 39974 42240 159895 21120 79948
EP-40 100 379 30980 12000 45425 48000 181699 24000 90850
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