VEVOR Diaphragm Pump Instruction Manual

Product Overview

The VEVOR 42 Series is an economical and flexible heavy-duty water pump. It provides high-volume water flow with reduced pump cycling, thanks to its large four-chamber diaphragm. Featuring an on-demand switch, 3.5 GPM flow rate, and 55 PSI pressure, the 42 Series meets special requirements with predictable performance. A built-in bypass function reduces rapid cycling by allowing water to flow back from the outlet to the inlet side of the pump. VEVOR also offers a variety of easy-connect fittings and filters.

Product Specifications

This four-chamber, high-volume pump is driven by a heavy-duty motor, producing flow rates of 3.5 GPM. It is capable of self-priming up to 6 vertical feet and can run dry, making it a price-to-performance leader. The pump also offers easy-connect fittings and filters.

Features

• 4-chamber diaphragm pump
• 5 min on, 10 min off cycle
• Bypass function reduces cycling
• Run dry capable for normal workloads
• Automatic operation controlled by pressure switch
• Industry-standard mounting pattern
• Self-priming
• Quiet Operation
• Ignition protected

Applications

• Yacht/RV/caravan pressurized water system
• Sprayer fixtures (vehicle-mounted sprayers, electric sprayers)
• Cleaning machines, Humidifiers, water purification, medical apparatus
• Food beverage filling & liquid transfer
• Solar water system
• Any other pressurization system

Installation

Materials Required

• 1. Diaphragm pump with related accessories
• 2. At least two pieces of flexible, reinforced hose piping, with collapsing strength of twice the inlet collapsing pressure (hose must be minimum 1/2" ID)
• 3. Stainless steel hose clamps and screws
• 4. Screws to fasten the pump to the mounting surface
• 1 electrical cut off switch
• 1 fuse
• 1 screwdriver
• 1 strong cutting implement for tubing (if desired)
• Teflon tape or sealant

Setup Instructions

1. The pump can be mounted in any position. If mounted vertically, the pump head should be in the down position to avoid leakage into the motor casing in the event of a malfunction.
2. Secure the feet, but do not compress them. Over-tightening the securing screws may reduce their ability to dissipate noise and vibration.
3. The inlet and outlet hoses must be 1/2" (13 mm) ID reinforced hoses. The diameter of branch and individual supply lines from the outlet should be no smaller than 3/8" (10 mm).
4. Plumb the system using high-pressure (2 x pump rating), braided, flexible tubing to minimize vibration/noise.
5. Do not apply inlet pressure in excess of 30psi. In general, try to avoid any inlet pressure completely.
6. Avoid any kinks or fittings which could cause excessive restrictions.
7. A strainer should be attached to the inlet side.
8. The fittings must be secured to avoid leakage.
9. Use clamps at both ends of the hose to prevent air leaks into the water line.
10. If a check valve is installed in the plumbing, it must have a cracking pressure of no more than 2 psi.
11. If applying a sealer or plumbing tape, be careful not to over-tighten, as they may be sucked into the pump.
12. This pump should be wired on its own dedicated circuit. Connect the positive lead (red) to the positive terminal of your battery and the negative wire (black) to the negative terminal of your battery.
13. In an easily accessible location, install a switch to control electricity to the pump. Turn the pump off when not used for extended periods or when the tank is empty.
14. The electrical circuit should be protected with an over-current protection device (fuse) in the positive lead. This pump requires a 15 amp fuse.
15. The pump circuit should not include any other electrical loads.
16. As the water supply pump is non-essential, reference the wire chart under the electrical information. Be sure to have the correct wire sizing for the length of wire you are using.
17. After installation, check the voltage at the pump motor. Voltage should be checked when the pump is operating. Full voltage must be available at the pump motor at all times.

Notes

• Flexible potable water hose or PEX tubing is recommended instead of rigid piping at the pump. If you choose to use rigid piping, provide a short length of hose between the pipe and the pump to avoid noise and vibration.
• Use of metal fittings is not recommended. When possible, use the provided plastic fittings.
• Do not adjust the bypass personally without the help of a technician.
• Lack of sanitizing and maintenance is a primary reason for pump underperformance. Perform maintenance and winterize the pump at appropriate times, especially before and after a period of storage.

About the Bypass Valve

Please consult a professional technician if the bypass needs adjustment. Improper adjustment of the bypass may damage the pump.

The bypass comes preset for optimal pump operation. If your application requires a different setting, you may change it. Carefully tighten the screw to increase or loosen the screw to decrease the minimum operating pressure of the bypass.

Troubleshooting

Pulsating Flow - Pump Cycles On and Off

• Check lines for kinks.
• Plumbing lines or fittings may be too small.
• Clean faucets and filters.
• Check fitting tightness for air leaks.

Failure to Prime but Motor Operates – No Pump Discharge

• Restricted intake or discharge line.
• Air leak in intake line.
• Punctured pump diaphragm.
• Insufficient initial amp supply to start the motor.
• Debris clogs in the valves.
• Crack in the pump housing.

Motor Fails to Turn On

• Loose or improper wiring.
• The pump circuit has no power.
• Blown fuse.
• Failed pressure switch.
• Defective motor.

Pump Fails to Turn Off After All Fixtures Are Closed

• Punctured diaphragm.
• Discharge line leak.
• Defective pressure switch.
• Insufficient voltage.
• Clogged valves in the pump head.

Low Flow and Pressure

• Air leak at the pump intake.
• Accumulation of debris inside pump or plumbing.
• Worn pump bearing (possibly accompanied by loud noise).
• Punctured diaphragm.
• Defective motor.

Noisy Pump

• Check if the mounting feet are compressed too tightly.
• Is the mounting surface flexible? If so, it may be adding noise.
• Check for loose head/screws.
• If the pump is plumbed with rigid pipe, it may transmit noise more easily.

Adjusting Shut-Off and By-Pass Pressures

Diagram: A schematic shows a water tank connected to a pump, which then connects to a pressure gauge, a valve, and an outlet.

1. Install the pump as shown in the diagram.

Adjusting the Bypass Valve and Pressure Switch

TIP: Bypass adjustment should be performed by a professional technician using proper gauge and equipment. Incorrect adjustment can cause the pump to work improperly.

About the Bypass Valve: The pump uses a spring-loaded bypass valve to maintain smooth performance as water demands change. When a faucet is turned on, the bypass valve is closed, allowing full water flow. When there is little or no water demand, the bypass valve opens, allowing water to flow back from the outlet to the inlet side, maintaining a steady flow within the pump with minimal cycling.

Adjusting the Pump's Shut-Off Pressure: (1)

• To raise the shut-off pressure, use a 2mm Allen wrench to turn the pressure switch screw clockwise to the desired pressure.
• To lower the shut-off pressure, use a 2mm Allen wrench to turn the pressure switch screw counter-clockwise to the desired pressure.

Adjusting the Bypass: (2)

• To raise the pressure at which the bypass starts and the full bypass pressure, use a 2mm Allen wrench to turn the bypass screw clockwise to the desired pressure.
• To lower the pressure at which the bypass starts and the full bypass pressure, use a 2mm Allen wrench to turn the bypass screw counter-clockwise to the desired pressure.

Caution

The pressure setting for full bypass must be at least 8psi higher than the shut-off pressure of the pump. If the switch and bypass are adjusted too closely, the bypass and switch shut-off can overlap, and the pump will not shut off.

Picture 2: Shows the top of the pump with labels for pressure switch (1) and bypass switch (2), and +/- indicators for adjustment.

FCC Information

This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.

This product is subject to the provision of European Directive 2012/19/EC. The symbol showing a wheelie bin crossed through indicates that the product requires separate refuse collection in the European Union. This applies to the product and all accessories marked with this symbol. Products marked as such may not be discarded with normal domestic waste, but must be taken to a collection point for recycling electrical and electronic devices.

*There may be minor changes to the numbers included in the user manual without prior notice.

Contact Information

Manufacturer: Xiamen Newmao Pump Co., Ltd

Address: 2nd Pak of Zone III, Floor 3, Main Building of Huaxin General Factory, No. 216, Huanzhu Road, Qiaoying Street, Jimei District, Xiamen

Email: CustomerService@vevor.com