Little GIANT MS320P-6B MS-Series Circulation Pumps Owner’s Manual
- June 3, 2024
- Little Giant
Table of Contents
MS320P-6B MS-Series Circulation Pumps
Owner’s Manual
OWNER’S MANUAL
MS320P-6B MS-Series Circulation Pumps
MS-Series Circulation Pumps
These stainless steel and bronze pumps come in four models and are meant to be
used submerged or inline with a flooded suction. They are intended to
circulate fresh or salt water through marine air conditioner heat exchanger
coils. Each pump includes a sturdy mounting bracket for securing the pump in
position and holding it in place.
This product is covered by a Limited Warranty for a period of 2 years from the
date of original purchase by the consumer. For complete warranty information,
refer to
www.LittleGiant.com.
Specifications
Model| Volts| HZ| Amps| Watts|
Shut Off ft (m)
---|---|---|---|---|---
MS320P-6B| 115| 60| 0.50| 60| 14.8 (4.51)
MS580P-6B| 0.65| 70| 13.2 (4.02)
MS580P-6-2B| 230| 50/60| 0.40| 92| 10.0 (3.05) /
13.2 (4.02)
MS900P-6B| 115| 60| 0.75| 85| 15.6 (4.75)
MS1200P-6B| 1.00| 105| 20 (6.10)
Model
| Inlet Size| Discharge Size
---|---|---
Thread| Hose I.D. in (cm)| Thread| Hose I.D. in
(cm)
MS320P-6B| 1/2 – 14 MNPT| 3/4” (1.91)| 1/4 – 18 MNPT| 1/2” (1.27)
MS580P-6B| ****
3/4 – 14 MNPT
| ****
1” (2.54)
| ****
1/2 – 14 MNPT
| ****
3/4” (1.91)
MS580P-6-2B
MS900P-6B
MS1200P-6B
SAFETY INSTRUCTIONS Specifications
SAFETY INSTRUCTIONS
This equipment should be installed and serviced by technically qualified
personnel who are familiar with the correct selection and use of appropriate
tools, equipment, and procedures. Failure to comply with national and local
electrical and plumbing codes and within Little Giant recommendations may
result in electrical shock or fire hazard, unsatisfactory performance, or
equipment failure. Know the product’s application, limitations, and potential
hazards. Read and follow instructions carefully to avoid injury and property
damage. Do not disassemble or repair unit unless described in this manual.
Failure to follow installation or operation procedures and all applicable
codes may result in the following hazards:
DANGER
Risk of death, personal injury, or property damage due to explosion, fire, or electric shock.
- Do not use to pump flammable, combustible, or explosive fluids such as gasoline, fuel oil, kerosene, etc.
- Do not use in explosive atmospheres or hazardous locations as classified by the NEC, ANSI/NFPA70.
- Do not handle a pump or pump motor with wet hands or when standing on a wet or damp surface, or in water.
- When a pump is in its application, do not touch the motor, pipes, or water until the unit is unplugged or electrically disconnected.
- If the power disconnect is out of sight, lock it in the open position and tag it to prevent unexpected application of power.
WARNING
Risk of severe injury or death by electrical shock.
- To reduce risk of electrical shock, disconnect power before working on or around the system.
- Wire pump system for correct voltage.
- Be certain that this pump is connected to a circuit equipped with a ground fault circuit interrupter (GFCI) device if required by code.
- Check electrical outlets with a circuit analyzer to ensure power, neutral, and ground wires are properly connected.
- Some pumps are supplied with a grounding conductor and grounding-type attachment plug. To reduce risk of electric shock, be certain that it is connected only to a properly grounded grounding-type receptacle. Do not remove the third prong from the plug. The third prong is to ground the pump to help prevent possible electric shock hazard. Do not use an extension cord.
- Some pumps are supplied with lead wires and are intended to be hardwired using a junction box or other approved enclosure. The pumps include a grounding connector. To reduce risk of electric shock, be certain that it is properly connected to ground.
- Check local electrical and building codes before installation. The installation must be in accordance with their regulations as well as the most recent National Electrical Code (NEC) and the Occupational Safety and Health Act (OSHA), and marine electrical codes.
- Do not use the power cord for lifting the pump.
- The pump should only be used with liquids compatible with pump component materials. If the pump is used with liquids incompatible with the pump components, the liquid can cause failure to the electrical insulation system resulting in electrical shock.
CAUTION
Risk of bodily injury, electric shock, or equipment damage.
- This equipment must not be used by children or persons with reduced physical, sensory or mental abilities, or lacking in experience and expertise, unless supervised or instructed. Children may not use the equipment, nor may they play with the unit or in the immediate vicinity.
- Equipment can start automatically. Always unplug the pump power cord and disconnect the electrical power before servicing the pump or switch.
- The pump has been evaluated for use with water only.
- Operation of this equipment requires detailed installation and operation instructions provided in this manual. Read entire manual before starting installation and operation. End User should receive and retain manual for future use.
NOTICE
Risk of damage to pump or other equipment.
- If pump is run dry, it may damage pump and void the warranty.
- Periodically inspect pump and system components. Regularly check hoses for weakness or wear, making certain that all connections are secure.
- Schedule and perform routine maintenance as required and in accordance with “Maintenance” on page 6 of this manual.
Physical Installation
NOTE: This pump can be used inline or submerged. It is not self-priming and must be located below the waterline. Seawater enters low and exits high.
-
Connect the strainer to the pump inlet. Refer to “Specifications” on page 1.
• Ensure accessibility for future maintenance.
• Both pump and strainer must be mounted within 2 ft of the through-hull.
IMPORTANT: Do not connect the pump to the engine water cooling intake as this can cause the engine to run dry. -
Connect the seacock and strainer. Refer to “Specifications” on page 1.
• Secure every connection with stainless steel clamps.
NOTE: The through-hull and seacock must be installed at least 8-12” below the water line. -
Connect the pump discharge to the air conditioner. Refer to “Specifications” on page 1.
• This pump is ignition-protected and must be within 10 ft of the air conditioner.
IMPORTANT: Do not cut hose until it is positioned in its final location. -
Attach the bracket to the pump and mount the assembly horizontally in a stable, flat place in the bilge.
• For power boats: ensure the pump always sits below the water line, even during hydroplaning.
• For sail boats: mount the pump close to the centerline to avoid losing water intake when heeling.
NOTE: The discharge must always sit above the inlet.
NOTE: Always orient the volute so that the inlet remains closest to the strainer and the discharge closest to the A/C. -
Position the through-hull water return line as close to the pump as possible and 4-8” above the water.
Electrical Connections
-
Employ an electrician to do the wiring.
-
Connect the power cord to a constant source of power matching the pump nameplate voltage.
-
The pump should be connected or wired to its own circuit, with no other equipment in the circuit.
-
Do not connect to a fan or any device that runs intermittently.
-
The fuses or circuit breaker should be of ample capacity.
-
Connect to a circuit equipped with a ground fault circuit interrupter (GFCI) if required by code.
-
Do not splice into the pump power cord. If necessary to add additional cord length, use a sealed junction box to splice marine grade cable to existing pump cable.
-
Do not remove the existing cable supplied with the pump.
IMPORTANT: If the power cord is damaged, the whole unit must be replaced.
MAINTENANCE
Periodic Maintenance
Periodically observe the pump’s performance. If a decrease in flow is noted,
clean the pump as follows:
-
Disconnect pump from power and remove from water source.
-
Unscrew the pump housing from the pump body.
IMPORTANT: Do not open the motor housing. -
Carefully clean any debris from the impeller and pump housing.
IMPORTANT: Do not remove the impeller from the motor shaft. -
Replace the pump housing, taking care to also replace the O-ring in the groove on the pump body.
Storage
- Refer to “Periodic Maintenance” on page 6 for cleaning.
- Coat the pump housing, impeller, shaft, and seal with a general purpose oil.
- Reassemble the pump.
- Store in a dry place.
Troubleshooting
Problem| Probable Causes|
Corrective Action
---|---|---
No water flow from pump
| There is no power to pump| Connect the pump to power.
The pump is not priming| Ensure that the inlet of the pump is below the water
sur- face.
Low water flow from the pump| The pump intake is blocked| Remove debris
blocking the intake or impeller.
The pump is not large enough| Select a larger capacity pump.
The seacock is partially or completely closed| Open seacock to allow for full
flow.
Pump runs intermittently| The pump is too hot| Check to see that no debris is
clogging the suction port.
Replacement Parts
Item(s)| Model(s)| Description|
Order Number
---|---|---|---
1| MS320P-6B| Overhaul Kit| 305626005
MS580P-6B; MS580P-6-2B| 305626006
MS900P-6B| 305626007
MS1200P-6B| 305626008
2| MS320P-6B| Mounting Plate Kit (Includes: 1 Mounting Plate, 4
Bushings, 1 Hose Cap)| 305626011
3| MS580P-6B; MS580P-6-2B; MS900P-6B; MS1200P-6B| Bracket Kit
(Includes: 2 Bracket Sets with upper and lower parts, 8 Bushings, 4 Screws, 4
Nuts)| **** 305626012
For technical assistance, parts, or repair, please
contact:
800.701.7894 | littlegiant.com
10000007658 Rev. 001 06/22
Franklin Electric Co., Inc. | Oklahoma City, OK 73157-2010
Copyright © 2022, Franklin Electric, Co., Inc. All rights reserved.
References
- HVAC and Wastewater Pumps & Systems | Little Giant
- HVAC and Wastewater Pumps & Systems | Little Giant
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