INSTALLATION AND SERVICE MANUAL
Contents
1. SEQUENCE 750 INSTALLATION AND SERVICE MANUAL PLEASE FILL IN FOR FUTURE REFERENCE MODEL SERIAL NUMBER DATE PURCHASED PLEASE FILL OUT THE WARRANTY REGISTRATION CARD INCLUDED WITH THIS PRODUCT OR ONLINE AT WWW MDMINC COM STRAIGHT CENTRIFUGAL INLET DISCHARGE MATERIAL INDUSTRIAL DUTY 1 8 HP 1 PHASE TEFC 1550 RPM 115 VAC MOTOR 8 FT 3 PRONGED CORD 2 FNPT 1 1 2 FNPT 40 GLASS FILLED POLYPROPYLENE WITH NORYL IMPELLER HARDWARE STAINLESS STEEL OPTIONS SALTWATER SERVICE ACCESORIES 90 CUBIC INCH STRAINER BASKETS 1 5 amp 2 SWING CHECK VALVES 1 5 2 3 Model 3600SEQ12 4200SEQ12 INLET 2 2 DISCHARGE 1 5 1 5 MAX FLOW gph 3600 4200 MAX HEAD feet 12 12 MAX POWER watts 139 160 MAX CURRENT amps 1 40 1 56 volts 115 115 MOTOR HP 1 8 1 8 MOTOR ENCLOSURE TEFC TEFC IMPELLER 8 9 WARNING Please read completely before you install or operate your new pump This is an external out of pond pump It is NOT submersible Do NOT allow this pump to become submerged Never run dry Max case pressure 25 PSI Proudly Made in the USA 2014 MDM INC Sustainable Efficient 7 SEQUENCE 750 We congratulate you on your choice of the Sequence 750 centrifugal pump Its leading edge design provides you with high output at a minimal operating cost It is carefully constructed to g2. ibility i e pump and pipe are sized for the system Insufficient Power Verify power supply and connection from panel to pump Verify proper voltage Some models are dual voltage 115 230 Flow Restriction Ensure valves are open Ensure plumbing is clear including suction strainers check valves etc Verify check valve orientation and direction of permitted flow MDM INCORPORATED AZ EDO MNA 3345 N Cascade Ave Colorado Springs CO 80907 PAN Gasgacinch is a registered trademark of Porter Manufacturing Noryl is a registered trademark of the General 7 Toll Free Phone 800 447 8342 Fax 866 425 1346 Electric Company Teflon is a registered trademark of DuPont Company Sequence is a registered trademark of www mdminc com info mdminc com MDM Incorporated Sequence 750 Installation Manual indd Adobe Indesign CC 06 06 14 Proudly Made in the USA 2014 MDM INC Sustainable Efficient
3. ive you long term reliable service To insure proper performance we urge you to carefully follow the instructions in this manual If you have any questions please call your supplier for assistance INSTALLATION Please read carefully When properly installed the Sequence 750 will provide dependable trouble free service Do not submerse the unit in water it is not a submersible pump Do not allow the pump to become submerged during transient periods such as heavy rain run off etc Locate the pump as near the water source as possible A flooded suction is preferred The pump is not self priming Therefore if the fluid level is below the pump a swing check valve must be installed below water level The pump and inlet line must be primed prior to start up Do not run pump dry For non flooded installations a strainer basket and check valve are recommended Mount the motor base to a secure immobile foundation Use only plastic fittings on both the inlet and discharge ports Seal the inlet amp discharge fittings with Teflon pipe dope These fittings should be self supported and in neutral alignment with each port i e Fittings must not be forced into port alignment which may cause premature line failure or damage to the pump volute Never restrict the inlet Keep both inlet and discharge lines as free of elbows and valves as possible Always use pipe of adequate diameter This will reduce friction losses and maximize output Never use a
4. le Before operating the Sequence 750 allow a proper cure time for the sealant used in step 2 DESCRIPTION SEQUENCEG P N BRACKET 0 RING DRAIN PLUG wur san ll 4B 07 06 05 01 04 03 50 10 0 75 i i Note These part numbers are only for standard models within the Sequence 750 series 750 05__ Reference page one for 0 7 __ M 4 Impeller number 5 8 9 1 5 FNPT DISCHARGE DRAIN PLUG amp O RING 2 INLET FNPT TE oL 0 25 DRAIN PORT FNPT PLUGGED DISASSEMBLY Shut off power to the motor before servicing any pump Unplug the power cord Disassemble the volute from the bracket six P Bolts and six flanged lock nuts The volute may remain attached to the plumbing to help simplify re installation Lock the shaft by placing a screwdriver blade into the shaft slot at the fan end of the motor Unthread the impeller from the motor shaft Take care not to misplace the small metal impeller washer Remove the ceramic with rubber boot from the impeller hub if you are replacing the seal Loosen the four M Bolts attaching the bracket to the motor Rotate the bracket counter clock wise until the screw heads are located in the large key hole slots Lift off the bracket from the motor Remove the carbon graphite seal assembly from the bracket by pressing it out from the motor side of the bracket Do not pry it out wi
5. n inlet line of smaller diameter than the discharge line Minimize the suction lift For additional plumbing tips review MDM s website www mdminc com for pond plumbing and pump installation hints n is BALL VALVE KRAAAAAAAAHKL BALL VALVE FLOODED SUCTION PUMP SUCTION LIFT SWING CHECK VALVE WARNING DO NOT RUN DRY MEET STATE AND LOCAL ORDINANCES NOTE THE PUMP MOTOR IS DESIGNED FOR 115 VAC 60HZ POWER ONLY WARNING SHUT OFF ELECTRICAL WARNING ALWAYS SHUT OFF ELECTRICAL POWER BEFORE INSTALLATION AND OR SERVICING THIS PUMP ALL ELECTRICAL WIRING SHOULD POWER BEFORE INSTALLATION AND OR SERVICING THIS PUMP ELECTRICAL HOOK UP CAREFULLY EXAMINE THE POWER CORD BEFORE USE DO NOT USE THIS POWER CORD IF THERE IS ANY VISIBLE DAMAGE DO NOT USE THIS POWER CORD IN WATER OR IF THE MOTOR OR ELECTRICAL RECEPTACLE IS IN CONTACT WITH ANY STANDING WATER THIS POWER CORD SHOULD ONLY BE PLUGGED INTO A PROPERLY INSTALLED 115 VAC GFI RECEPTACLE ALWAYS TEST CYCLE A GFI RECEPTACLE TO DETERMINE ITS CONDITION BEFORE USE Proudly Made in the USA Sustainable Efficient 2014 MDM INC 10 11 12 Whe on 7 SEQUENCE 750 PUMP END ASSEMBLY Inspect all pump parts O ring O ring groove impeller hub ID motor shaft etc and clean if necessary Apply sealant to the bracket bore ID wall and around the seal case follow sealant mfg in
6. ntake side System Incompatibility Verify hydraulic compatibility i e pump amp pipe are sized for the system 2 Verify power supply and connection from panel to pump Insufficient Power Verify proper voltage Some models are dual voltage 115 230 Ensure valves are open Flow Restriction Ensure plumbing is clear including suction strainers check valves etc Low Flow Clean out leaves or other debris from basket strainer if applicable Insufficient Prime Prime system with water and purge all air from suction piping Cavitation Verify airtight plumbing on the suction plumbing especially fittings Clean out leaves or other debris from basket strainer if applicable Increase pipe size where possible Decrease suction pipe length reduce the number of elbows etc Verify hydraulic compatibility i e pump and pipe are sized for the system Sporadic Operation Insufficient Power Verify power supply and connection from panel to pump Poor Ventilation Verify proper voltage Some models are dual voltage 115 230 Ensure adequate aiflow over motor to prevent overheating Excessive Noise Cavitation Verify airtight plumbing on the suction plumbing especially fittings Clean out leaves or other debris from basket strainer if applicable Increase pipe size where possible Decrease suction pipe length reduce the number of elbows etc Verify hydraulic compat
7. structions We recommend using Gasgacinch Silicone sealant can also be used Press the carbon graphite seal into the bracket while taking care not to touch or damage the carbon graphite face Never touch or apply pressure to the carbon graphite seal face Screw four M Bolts five complete turns into the threaded holes located on the motor face Mount the bracket to the motor by aligning the key holes over each bolt head then rotate clockwise which will position the small key hole slot under each bolt head Tighten each bolt with a wrench to secure the bracket to the motor 8 25 Ib in Carefully lubricate the seal seat elastomer OD and impeller hub ID with water Press the seal seat into the impeller hub making certain that the ceramic is in evenly the sealing surface should be parallel with the impeller hub Apply CLEAN water to the carbon graphite and seal seat sealing surfaces Do not use silicon lubricants or grease Lock the shaft by placing a screwdriver blade into the shaft slot at the fan end of the motor Thread the impeller onto the motor shaft Insure that the small impeller washer is in place on the impeller Thread until the washer securely contacts the shaft shoulder Seat the large O ring into the bracket O ring groove Assemble the volute onto the bracket with six P Bolts 10 24 x 2 3 4 carriage bolts and six flanged lock nuts Tighten in a cross pattern 30 Ib in Install the drain plug and O ring into the volute drain ho
8. th a screwdriver from the pump cavity side of the bracket if you are replacing the seal Proudly Made in the USA Sustainable Efficient 2014 MDM INC 7 SEQUENCE 750 MAINTENANCE Lubrication Motor Permanently Lubricated ball bearings no service required Rotary Seal Requires no lubrication after assembly WARNING EYE PROTECTION IS STRONGLY RECOMMENDED The pump must be drained before servicing or if stored below freezing temperatures Periodic replacement of seals may be required due to normal carbon wear Symptom Problem Resolution Prime system with water and purge all air from suction piping Insufficient Prime Install check valve 2 Verify power supply and connection from panel to pump Insufficient Power Verify proper voltage Some models are dual voltage 115 230 Ensure valves are open No Flow Ensure plumbing is clear including suction strainers check valves etc Flow Restriction i s Verify check valve orientation and direction of permitted flow Clean out leaves or other debris from basket strainer if applicable Air leak Fix air leaks at fittings connections strainer basket etc This typically occurs on the intake side System Incompatibility Verify hydraulic compatibility i e pump amp pipe are sized for the system Air leak Fix air leaks at fittings connections strainer basket etc This typically occurs on the i
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