Seaflo 51 54 Series - User Manual

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SEAFLO 51, 52, 52A & 54 Series are 5 chambers pump that can provide max pressure of 60 PSI and 3

to 5 GPM open ﬂow rate. They are self-priming, and can run dry without damage. They can

automatically starts and stops the pump when the faucet is opened and closed. 52 series provide a

micro cut oﬀ pressure switch. 52A series provide a TTI cut oﬀ switch, IP54 and external fuse protection

and the bypass function can be optional choose. 54 Series provide a micro cut oﬀ and bypass switch.

The bypass switch in 52A and 54 series is able to reduce rapid cycling and allow water to ﬂow back from

the outlet side to the inlet side of the pump, which ensure the performance reliable and low current.

SEAFLO also oﬀers a variety of easy connect ﬁttings and ﬁlters.

Diaphragm Pump Manual

The bypass comes preset for optimal operation of the pump. If your application calls for a diﬀerent

setting for the bypass, you may change it yourself. Carefully tighten the screw to increase or loosen

the screw to decrease the minimum operational pressure of the bypass.

Please consult a professional technician in the case that the bypass needs adjustment. Improper

adjustment of the bypass may damage the pump.

ABOUT THE BYPASS (52A-BYPASS VERSION, 54 SERIES ONLY)

Please do follow the instruction manual to install the product. Any action outside what is

recommended in this manual may bring damage to the pump. Any inappropriate installation or

operation that causes the pump damage is not covered by warranty.

CAUTION

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picture 2

ADJUSTING THE BYPASS VALVE AND PRESSURE SWITCH (52A-bypass version, 54 SERIES ONLY)

About the Bypass Valve

The pump uses a spring-loaded bypass valve to maintain smooth performance as water

demands rise and fall. When a faucet is turned on the pump is providing full water ﬂow, so

the bypass valve is closed. But when there is little to no water demand, the bypass valve

opens to allow water to ﬂow back from the outlet side to the inlet side, keeping a steady ﬂow

of water within the pump with almost no cycling.

TIP: Bypass adjustment should be performed by a professional technician using a

proper gauge and equipment. Without the proper equipment, you could mis-adjust the valve

or switch causing the pump to work improperly (see Caution below).

ADJUSTING THE PUMP’S SHUT-OFF PRESSURE: (1)

To lower the shut-oﬀ pressure, use a 2mm Allen

wrench to turn the pressure switch screw counter-

clockwise to the desired pressure.

To raise the shut-oﬀ pressure, use a 2mm Allen

wrench to turn the pressure switch screw clockwise

to the desired pressure.

ADJUSTING THE BYPASS: (2)

To lower the pressure at which the bypass starts

and lower the full bypass pressure, use a 2mm

Allen wrench to turn the bypass screw counter-

clockwise to the desired pressure.

To raise the pressure at which the bypass starts

and raise the full bypass pressure, use a 2mm Allen

wrench to turn the bypass screw 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

is adjusted too closely, the bypass and switch

shut-oﬀ can overlap and the pump will not shut

oﬀ.

pressure switch 1

by-pass switch 2

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FEATURES

Bypass: reduces cycling (only for

52A-bypass version and 54 series)

5 chamber diaphragm pump

Continuous duty

APPLICATIONS

Automatic: controlled by pressure switch

Industry standard mounting pattern

Run dry capable for normal workloads

Quiet Operation

Self priming

Ignition protected

Cleaning machines, humidiﬁer, water puriﬁcation, medical apparatus

Yacht/RV/caravan pressurized water system

Solar water system

Sprayer ﬁxtures (vehicle-mounted sprayers, electric sprayers)

Food beverage ﬁlling & liquid transfer

Any other pressurization system

INSTALLATION

Materials

(if desired) Teﬂon tape or sealant

2 (at least) pieces of ﬂexible, reinforced hose piping, with collapsing strength of twice the inlet collapsing

pressure, hose must be minimum 1/2" ID (54 series) or 3/4" ID (52 series)

1 diaphragm pump with related accessories

1 electrical cutoﬀ switch

1 fuse

1 strong cutting implement for tubing

4 screws to fasten the pump to the mounting surface

4 stainless steel hose clamps and screws

1 screwdriver

51, 52, 52A, 54 Series

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Do you have a question about the Seaflo 51 54 Series and is the answer not in the manual?

The SEAFLO 51, 52, 52A, and 54 Series are diaphragm pumps designed for various pressurized water applications. These pumps feature a 5-chamber diaphragm design, providing a maximum pressure of 60 PSI and an open flow rate of 3 to 5 GPM. They are self-priming and can run dry without damage, automatically starting and stopping when a faucet is opened or closed.

Function Description:

The primary function of these pumps is to provide a consistent flow of pressurized water. They are equipped with a spring-loaded bypass valve that maintains smooth performance as water demands fluctuate. When a faucet is turned on, the pump provides full water flow, and the bypass valve remains closed. When there is little to no water demand, the bypass valve opens, allowing water to flow back from the outlet to the inlet side, which helps maintain a steady flow within the pump and minimizes cycling.

The 52 series includes a micro cut-off pressure switch, while the 52A series features a TTI cut-off switch, IP54 protection, external fuse protection, and an optional bypass function. The 54 Series incorporates both a micro cut-off and bypass switch. The bypass switch in the 52A and 54 series is crucial for reducing rapid cycling and ensuring reliable performance with low current draw by allowing water to flow back from the outlet to the inlet side of the pump.

Important Technical Specifications:

Pump Type: 5-chamber diaphragm pump
Maximum Pressure: 60 PSI
Open Flow Rate: 3 to 5 GPM
Power: Continuous duty
Electrical Circuit Protection: Requires a 40 amp fuse in the positive lead.
Inlet Pressure: Do not exceed 30 psi.
Hose Requirements:
- Intake hose: Minimum 1/2" (13 mm) ID for 54 series or 3/4" (19 mm) ID for 52 series, reinforced.
- Main distribution line: 1/2" (13 mm) ID for 54 series or 3/4" (19 mm) ID for 52 series.
- Branch and individual supply lines: No smaller than 3/8" (10 mm).
Wiring: Dedicated circuit, positive lead (red) to positive battery terminal, negative lead (black) to negative battery terminal.
Wire Sizing (AWG):
- 0-20 ft (0-6 m): 14 AWG
- 20-30 ft (6-9 m): 12 AWG
- 30-50 ft (9-15 m): 10 AWG
- 50-65 ft (15-19 m): 8 AWG
Check Valve: If installed, must have a cracking pressure of no more than 2 psi.

Usage Features:

Self-priming: The pump can draw water without external priming.
Run Dry Capable: Can operate without water for normal workloads without damage.
Automatic Operation: Controlled by a pressure switch, starting and stopping automatically based on water demand.
Quiet Operation: Designed for reduced noise during operation.
Ignition Protected: Suitable for use in environments where flammable vapors may be present.
Standard Mounting Pattern: Designed for easy installation with industry-standard mounting.
Bypass Function (52A-bypass version and 54 series): Reduces cycling and ensures consistent performance.
Mounting Flexibility: Can be mounted in any position; if mounted vertically, the pump head should be in the down position to prevent leakage into the motor casing.
Easy Connect Fittings: SEAFLO offers a variety of easy connect fittings and filters.

Maintenance Features:

Bypass Adjustment: The bypass valve can be adjusted to change the pressure at which it starts and achieves full bypass. This adjustment should ideally be performed by a professional technician using a proper gauge and equipment to avoid improper operation. The full bypass pressure must be at least 8psi higher than the pump's shut-off pressure to prevent overlap and ensure proper shut-off.
Shut-off Pressure Adjustment: The pump's shut-off pressure can be adjusted using a 2mm Allen wrench. Turning clockwise increases the pressure, while turning counter-clockwise lowers it.
Sanitization and Maintenance: Regular sanitization and maintenance are crucial for optimal pump performance. It is recommended to perform maintenance and winterize the pump at appropriate times, especially before and after periods of storage.
Troubleshooting: The manual provides guidance for common issues such as pulsating flow, pump cycling, failure to prime, motor not turning on, pump not turning off, low flow/pressure, and noise. These sections help users identify and resolve problems like kinks in lines, air leaks, clogged filters, defective switches, or worn components.
Repair Kits: Detailed repair kits are available for 51, 52, 52A, and 54 Series pumps, including components like pump head assemblies, valve assemblies, diaphragm assemblies, motors, pressure switches, and rubber feet, facilitating easy replacement of parts.