MDM SEQUENCE ALPHA PRIMER Manual

© MDM INCORPORATED
WWW.MDMINC.COM
Reliable. Efficient.
PROUDLY MADE
IN THE USA
®
ALPHA PRIMER
P.1
Read this manual 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.
INSTALLATION AND SERVICE MANUAL
Model 6800PRM19 7800PRM24
INLET 2” 2”
DISCHARGE 2” 2”
MAX FLOW (GPH) 6800 7800
MAX HEAD (FEET) 19’ 24’
MAX POWER (WATTS) 369 504
MAX CURRENT (AMPS) 3.93 @115V 5.02 @115V
VOLTS 115/230 115/230
MOTOR HP 1/2, 1/3 1/2, 1/3
MOTOR TYPE 56Y 56Y
MOTOR ENCLOSURE TEFC TEFC
TYPE: STRAIGHT CENTRIFUGAL
MOTOR: NEMA 56Y
HORSEPOWER: 1/3, 1/2 (1750 RPM)
INLET: 2” FNPT WITH 2” SLIP ADAPTERS
DISCHARGE: 2” & 2 1/2” SLIP ADAPTERS
MATERIAL: GLASS-FILLED POLYPROPYLENE
HARDWARE: STAINLESS STEEL
OPTIONS: SALTWATER SERVICE
ACCESSORIES: SWING CHECK VALVES (1.5”, 2”, 3”)
S/N: XXXX-XXXXXX
XXXXPRMXX
*MOTORS ARE SUBJECT TO CHANGE DUE TO
AVAILABILITY OR SPECIFICATION REQUIREMENTS.
FILL IN FOR FUTURE REFERENCE:
MODEL: ______________________________
SERIALNUMBER:_______________________
DATEPURCHASED:______________________
COMPLETE AND MAIL YOUR WARRANTY REGISTRATION
CARD INCLUDED WITH THIS PRODUCT OR FILE ONLINE AT:
WWW.MDMINC.COM/PUMP-REGISTRATION
®

© MDM INCORPORATED
WWW.MDMINC.COM
Reliable. Efficient.
PROUDLY MADE
IN THE USA
®
ALPHA PRIMER
P.2
WARNING: ALWAYS SHUT OFF ELECTRICAL POWER BEFORE INSTALLATION AND / OR SERVICING THIS PUMP.
ALL ELECTRICAL WIRING SHOULD MEET STATE AND LOCAL ORDINANCES. IMPROPER WIRING MAY NOT ONLY BE A SAFETY HAZARD BUT MAY
PERMANENTLY DAMAGE THE MOTOR AND/OR PUMP. 230V 50HZ MOTORS ARE AVAILABLE. CONTACT YOUR SUPPLIER FOR INFORMATION.
ELECTRICAL HOOK-UP
1. Check that supply voltages match the motor’s requirements.
2. Check motor wiring and connect, according to instructions on motor, to match supply voltage.
3. Power cord should be protected by conduit or by cable and be of proper gauge. It should be no longer than necessary.
4. Power should be drawn directly from a box with circuit breaker protection or with a fused disconnect switch.
We congratulate you on your choice of the Sequence®Alpha Primer. It has been carefully designed using the advantages of today’s technology and carefully
constructed to give you the dependability of yesterday. 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 or visit www.mdminc.com/support.
INSTALLATION
Please read carefully. When properly installed the Sequence®Alpha Primer will provide dependable trouble-free service.
1. Locate pump as near the source to be pumped as possible. A flooded suction situation is preferred. This pump is self-priming, however, there must be fluid in the
pump for it to function properly. A check valve is recommended for non-flooded suction (Figure 1).
2. Mount motor base to a secure, immobile foundation.
3. Use only plastic fittings on both the intake and discharge ports. Seal pipe connections with Teflon®paste. These fittings should be self-supported and in neutral
alignment with each port (i.e. Fittings must not be forced into alignment which may cause premature line failure or damage to the pump volute).
4. Never restrict the intake. Keep both input 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.
5. Before starting pump, the priming pot must be filled with water.
PRIMER
SWING CHECK VALVE
FLOODED SUCTION
BALL VALVE
SUCTION LIFT
(Figure 1)
WARNING: DO NOT RUN DRY

© MDM INCORPORATED
WWW.MDMINC.COM
Reliable. Efficient.
PROUDLY MADE
IN THE USA
®
ALPHA PRIMER
P.3
PUMP END ASSEMBLY
1. Inspect all pump parts (O-ring, O-ring groove, impeller hub ID, motor shaft, etc.) and clean if necessary.
2. If replacing the seal, apply sealant in bracket bore hole and around seal case according to sealant instructions. We recommend using Gasgacinch®. Silicone
sealant can also be used.
3. Press seal into bracket while taking care not to damage seal face.
4. Place slinger (rubber washer) over motor shaft and mount bracket to motor.
5. If replacing the seal, carefully lubricate the boot around ceramic piece and press it into the impeller hub making certain that the ceramic is in evenly - the
sealing surface should be parallel with the impeller hub.
6. Apply clean water to the carbon-graphite and seal seat sealing surfaces. Do not use silicon lubricants or grease.
7. Mount bracket to motor face.
8. Thread impeller onto shaft and install o-ring and screw. If required, remove motor end-cap and use a screwdriver on the back of motor shaft to prevent shaft
rotation while tightening. Replace motor end cap.
9. Place diffuser over impeller and tighten the allen bolts used to hold diffuser in place. Note: Be sure diffuser is in an upright position. (The word “top” appears
on the diffuser as an indicator).
10. Seat O-ring on diffuser. Assemble diffuser to bracket with 2 allen screws.
11. Seat O-ring in bracket slot and assemble casing to bracket.
12. Install drain plugs with its O-rings in casing drain holes.
DISASSEMBLY
1. Shut off power to motor before disconnecting any electrical wiring.
2. Close all necessary valves on inlet and discharge lines and drain the pump by removing both drain
plugs. The water will drain faster if you loosen the lid.
3. Disassemble bracket-motor assembly from casing by removing the nuts and bolts. (The casing
may be left in-line).
4. Unscrew the two allen bolts and remove diffuser. Diffuser may need to be pried off with a flathead
screwdriver.
5. Remove screw and O-ring from front side of impeller. Screw is a left-handed thread and loosens
in a clockwise direction.
6. Remove cap covering shaft at back of motor. Unscrew the impeller by twisting counterclockwise
while holding the shaft with a large screwdriver to prevent shaft rotation.
7. Remove ceramic piece from impeller (if replacing the seal).
8. Detach bracket from motor.
9. Remove seal from bracket by pressing out from the back (if replacing the seal). Do not dig out
from the front.
NO. DESCRIPTION P/N
1 SEAL 1000.0414
2 IMPELLER *DEPENDS ON MODEL CONSULT FACTORY
3 O-RING (CASING TO BRACKET) 9000.061
4 CASING 9000.070
5 DRAIN PLUG 1000.110
6 O-RING (DRAIN PLUG) 805-0112
7 DIFFUSER 9000.120
8 O-RING (DIFFUSER) 9000.121
9 LID 9000.779
10 HARDWARE KIT 9000.502
11 SLINGER 1000.010V
12 BRACKET 9000.030
13 O-RING (LID) 9000.777
14 STRAINER BASKET 9000.778
15 2” ADAPTER (2 ½” UNION X 2” SOCKET) 9000.070-2
IMPELLER*
SEAL DRAIN PLUG
& O-RING
STRAINER
BASKET
HARDWARE
BRACKET
O-RING,
(CASING TO BRACKET) O-RING
(DIFFUSER)
DIFFUSER
LID
O-RING
(LID)
CASING
SLINGER
2” ADAPTER
( 2 ½” UNION X 2” SOCKET)
10
11
12
3
7
8
4
13
9
15
14
5 6
2
1

© MDM INCORPORATED
WWW.MDMINC.COM
Reliable. Efficient.
PROUDLY MADE
IN THE USA
®
ALPHA PRIMER
P.4
SYMPTOM PROBLEM RESOLUTION
No Flow
Insufficient Prime Prime system with water and purge all air from suction piping.
Install check valve.
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.
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 & pipe are sized for the system.
Low Flow
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 & 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.
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.
Verify proper voltage. Some models are dual voltage (115/230).
Poor Ventilation Ensure adequate airflow 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 compatibility: 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
3345 N. Cascade Ave • Colorado Springs, CO • 80907
Phone [phone] • Fax [phone]
www.mdminc.com • [email protected]
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.
Gasgacinch®is a registered trademark of Porter Manufacturing.
Teflon®is a registered trademark of the Chemours Corporation.
Sequence®is a registered trademark of MDM Incorporated.
Sequence Alpha Primer Installation Manual 2020.indd. Adobe Indesign CC. Updated 10/12/20.