increase the pressure inside the EP wet chamber. A low pressure 1/2 psi pressure switch (P/N 70-
02315) is also available and can be installed in lieu of the 5 psi pressure switch supplied.
b. The bulb has become disconnected from the bulb connector. Disconnect the power cord from the
electrical outlet, open the electrical enclosure bonnet and confirm the bulb connector is firmly in
place. At the same time, check all exposed wires for a possible loose connection. Plug the electrical
cord back into the electrical outlet ONLY after the electrical enclosure bonnet has been re-installed
on the EP unit.
c. Verify that the electrical cord is plugged into a hot outlet. Test the electrical outlet. You should
confirm the availability of the same power as indicted on the electrical label on your EP unit.
d. Make sure you have not plugged your unit into any power source other than that specified on your
unit’s electrical label. If you have done so in error, the ballast has been damaged and needs to be
replaced. Contact your supplier for the correct replacement ballast. (Not warranted)
18.2 The UV Bulb Is No Longer Lit - This occurs after the unit has been operating successfully for a period
of time.
a.The bulb has burned out. Replace the UV bulb.
b.The ballast has burned out. Contact your supplier or Delta UV for assistance in obtaining a new
ballast.
c.Verify that the electrical outlet where the EP unit is plugged into has the proper voltage and the cord
is securely plugged into the outlet.
d.Verify that the GFCI has not tripped. To verify the operating state of the GFCI, trip the GFCI manually
and reset it manually. The GFCI should reset. If it does not, it indicates a fault to ground in the
electrical circuit or the EP unit itself.
18.3 The UV Bulb Stays Lit When The Pump Is Off - The EP unit is equipped with a safety pressure switch
that turns the UV bulb off when the pump is turned off. This function guards against having the bulb lit
accidentally when the electrical enclosure bonnet is removed and serves to ensure that there is water flowing
in the EP unit wet chamber to cool the bulb and extend its life.
a.If the EP unit is located below the water level of the pond or pool, there is a static head of water that
causes pressure to be found inside the wet chamber. This static head of pressure closes the pressure
switch and the bulb stays lit even when the pump is off. Contact your supplier or Delta UV to obtain
a special pressure switch that can be adjusted to allow for the static head of water.
b.If the EP unit is located above the water level of the pond and the bulb stays lit when the pump is off,
replace the pressure switch.
18.4 The Water Is Green - Green water is an indication that the UV rays generated by the EP unit are
not effective or are not being generated by the UV bulb.
a.Check the bulb to make sure it is on. If it is not on, follow the procedures above regarding the UV
bulb not lighting.
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