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8

11. MAINTENANCE

• 

Disconnect pump when power is interrupted or unstable.

• 

To avoid overheating, do not restrict the suction end to adjust flow.

• 

If there are any abnormal noises, stop the pump immediately and 

check the connections, hose clamps, mounting hardware, etc.

• 

If the pump will remain unused for an extended time, or to winterize, 

be sure to drain the water to prevent damage from freezing water. 

The best way to do this is to disconnect the power and plumbing 

lines, turn the pump upside down to fully drain the pump and control

-

ler. 

12. TROUBLESHOOTING

Issue

Solution

The pump does not 
run

• 

Check the voltage on the label and make 

sure the input voltage is within 10 volts of 

the value

• 

Check the fuse or thermal protector for 

damage

The pump does not 
pump properly

• 

Make sure the head isn’t too high

• 

Verify the suction head is in water

• 

Prime the pump

The pump runs but no 
water

• 

Check the suction side intake connection 
and ensure it is not blocked or damaged. 

If so, clean or replace the connection.

• 

Clean or replace intake screen, if present

• 

Ensure the pump is fully primed and no 

air exists in the suction side of the pump 

including the connection lines. This pump 

operates best with a flooded suction 

connection. If pump is located above the 

water source a loss of prime may occur. 

This pump is not self priming and may 

require manual repriming.

The flow reduces

 

drastically

• 

Clean or replace intake screen, if present

• 

Check water level as it may be too low for 

pump operation

The pump keeps 
stopping and starting

• 

There is a small leak in the delivery pipe-

line: check for any leaking taps or running 

toilets

The motor is overheat-
ing, or, stops soon 

after starting

• 

Verify supply voltage under load is within 

10 volts of the required voltage (110 volts)

• 

Improve ventilation

Summary of Contents for MHP50

Page 1: ...MHP50 MHP75 MHP150 USER MANUAL...

Page 2: ...It is the installer s responsibility to read understand and comply with these instructions...

Page 3: ...tions requirements Optionally for added ease of use the pump may be paired with an aux iliary pump controller RainFlo PC115A for on off functions and run dry protection Please Note This appliance is o...

Page 4: ...e intended for use in pumping circulating and boosting water industrial fluids and other weak chemical industrial mediums Rainwater harvesting systems Greywater systems Water treatment processes Water...

Page 5: ...n damage the product Before proceeding with installation make sure the unit shows no visible signs of damage Mounting Location The pump must be mounted in a horizontal orientation and must be mounted...

Page 6: ...ns should always be made by a qualified electrician Extra care should be taken to verify that all components are properly grounded NOTICE This pump must be primed prior to first use Priming Procedure...

Page 7: ...ure up to 45 PSI up to 45 PSI up to 45 PSI Inlet outlet size 1 FNPT 1 FNPT 1 FNPT 1 FNPT 1 FNPT 1 FNPT Weight 19 65 lbs 22 lbs 25 5 lbs Dimensions 15 75 L x 6 5 W x 9 H 15 75 L x 6 5 W x 9 H 16 L x 6...

Page 8: ...0 170 160 150 140 130 120 110 100 90 80 70 60 50 40 30 20 10 0 Hft RainFlo MHP50 RainFlo MHP75 RainFlo MHP150 10 PERFORMANCE CHARTS RainFlo MHP50 Performance Chart TDH PSI GPM 79 34 3 5 77 33 5 74 32...

Page 9: ...0 104 45 15 8 92 40 17 0 81 35 18 8 69 30 20 2 58 25 21 4 46 20 22 7 35 15 24 0 23 10 25 0 13 5 5 26 2 RainFlo MHP150 Performance Chart TDH PSI GPM 160 68 2 139 60 12 127 55 15 2 116 50 19 3 104 45 2...

Page 10: ...isn t too high Verify the suction head is in water Prime the pump The pump runs but no water Check the suction side intake connection and ensure it is not blocked or damaged If so clean or replace the...

Page 11: ...9...

Page 12: ...RainHarvest Systems RainHarvest com 800 654 9283 030524...

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