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TESTING
1. With the unit plugged in and the discharge line in place, pour water into the pump reservoir until the unit activates to
verify the unit works.
2. To test the overflow safety circuit (Models 20+ULS and 20+ULST only):
a. Energize the appliance so it runs.
b. Kink the tube coming from the pump discharge, or unplug the power cord, so it cannot pump out.
c. Pour water into the pump reservoir, filling it completely.
d. As the water level nears the top of the unit the overflow safety switch should activate, breaking the thermostat
circuit to the appliance (or triggering an alarm circuit, if used.)
e. Un-kink the tube, or plug the cord back in, and allow the pump to empty the tank. As the water level goes down
the overflow safety switch will deactivate and the appliance will energize again (or the alarm will reset.)
MAINTENANCE
WARNING: Before attempting any maintenance on the unit, disconnect the power cord from the power supply to
reduce the risk of electric shock. Also, take whatever precautions are necessary if the safety overflow switch is
wired to a thermostat or alarm circuit.
SERVICING OF A DOUBLE-INSULATED APPLIANCE
In a double-insulated product, two systems of insulation are provided instead of grounding. No grounding means is
provided on a double-insulated product, nor should a means for grounding be added to the product. Servicing a double-
insulated product requires extreme care and knowledge of the system, and should be done only by qualified service
personnel. Replacement parts for a double-insulated product must be identical to the parts they replace. A double-
insulated product is marked with the words “DOUBLE INSULATION” OR “DOUBLE INSULATED”
If the unit does not perform as stated in the above tests, remove the two screws holding the cover from the deck, and
remove the cover. Verify that the float mechanism moves up and down freely. If the float binds, it may be dirty or
damaged. Since the motor is totally enclosed, no maintenance is required on the motor. However, the tank and float may
need to be cleaned periodically. Simply remove the four screws at the corners of the pump deck and lower the tank. The
tank can now be cleaned with a mild detergent. Use a damp cloth to wipe off the float if necessary. The impeller may
need to be cleaned as well.
REFER TO THE FOLLOWING IN ORDER TO CLEAN THE IMPELLER
1. Remove the entire pump from the mounting wall.
2. Disassemble the tank from the deck by removing the four screws in the corners of the deck.
3. Turn the unit upside down and remove the impeller cover by loosening the five screws on the underside of the motor.
4. The impeller and shaft assembly may then be removed and cleaned. The impeller chamber should be cleaned at
this time as well.
5. Wipe off the gasket between the impeller cover and the motor housing with a damp cloth before reassembling the
impeller to the motor.
6. Reassemble the tank to the deck and reinstall the pump.
REFER TO THE FOLLOWING TO CLEAN THE CHECK VALVE AND VERIFY ITS OPERATION
1. Remove the discharge line from the check valve.
2. Use a 9/16" wrench to remove the check valve from the deck of the pump.
3. Visually check the valve for obstructions. If damaged, replace.
4. To re-install the check valve, hand tighten it into the deck. Then, tighten 1/2 turn further with a wrench. Be careful
not to over-tighten as this may distort the O-ring seal under the check valve.