MDC33 and MDC50 Series Submersible Sump Pumps

Hazardous voltage. Can shock, burn orkill. The pump should always be electrically grounded toa suitable electrical ground such as a grounded waterpipe or a properly grounded metallic raceway, or groundwire system. Do not modify the cord or plug or cut off theround ground pin.9. If the pump discharge line is exposed to an outside subfreezingatmosphere, the portion of the line exposedmust be installed so any water remaining in the pipe willdrain to the outfall by gravity. Failure to do this can causethe water trapped in the discharge to freeze which couldresult in damage to the pump.10. After the piping and check valve have been installed, theunit is ready for operation.11. Check the operation by filling the sump with water andobserving pump operation through one complete cycle.Risk of Flooding. Failure to make thisoperational check may lead to improper operation, prematurefailure, and flooding.OPERATION / MAINTENANCERisk of electrical shock. Can burn or causedeath. Do not handle a pump or pump motor with wet handsor when standing on a wet or damp surface, or in water.Before attempting to check why unit has stopped operating,disconnect power from unit.Risk of fire and explosion. Can causesevere injury, property damage or death. Do not use inexplosive atmospheres. Pump water only with this pump.1. The shaft seal depends on water for lubrication and cooling.Do not operate the pump unless it is submerged inwater as the seal may be damaged if allowed to run dry.2. The motor is equipped with an automatic reset thermalprotector. If the temperature in the motor should riseunduly, the switch will cut off all power before damagecan be done to the motor. When the motor has cooledsufficiently, the switch will reset automatically and restartthe motor. If the protector trips repeatedly, the pumpshould be removed and checked as to cause of difficulty.Low voltage, long extension cords, clogged impeller, verylow head or lift, etc., could cause cycling.3. The pump will not remove all water. If a manually operatedpump is operating and suddenly no water comes out of thedischarge hose, shut the unit off immediately. The waterlevel is probably very low and the unit has broken prime.3649 02003-1/2"(89 mm)Figure 2 – Float Switch Tether Length, Models MDC33P1,MDC33PC1, MDC50P1 and MDC50PC1.NOTICE: Do not change the tether length of the float switch.The float must be able to swing through its complete arcwithout interference.AIRLOCKSWhen a pump airlocks, it runs but does not move any water.An airlock will cause the pump to overheat and fail. Thesepumps have a built in anti-airlock hole. See the explodedview on the repair parts page for the location of the hole.Leakage from the anti-airlock hole is normal.If you suspect an airlock, unplug the pump, clean out theanti-airlock hole with a paper clip or a piece of wire, andrestart the pump.TROUBLESHOOTING CHARTSYMPTOM PROBABLE CAUSE(S) CORRECTIVE ACTIONPump won’t start Blown fuse. If blown, replace with a fuse of proper size.or run. Low line voltage. If the voltage is under the recommended minimum, check the sizeof the wiring from the main switch on the property. If OK, contactpower company or hydro authority.Defective motor.Replace the pump.Defective float switch. Replace the float switch.Impeller.If the impeller won’t turn, remove the lower pump body and locatethe source of the binding.Float is obstructed.Remove the obstruction.Pump starts and stops Backflow of water from Install or replace the check valve.too often.piping.Faulty float switch.Replace the float switch.Pump won’t shut off. Defective float switch. Replace the float switch.Restricted discharge Remove the pump and clean the pump and piping.(obstacle in piping).Float obstructed.Remove the obstruction.Pump operates but Low line voltage. If the voltage is under the recommended minimum, check the sizedelivers little or noof the wiring from the main switch on the property. If OK, contactwater.power company or hydro authority.Something is caught in Clean out the impeller.impeller.Anti-airlock hole is plugged. Turn off the pump, clean out the anti-airlock hole, and restart pump.3