28/07/2019
When it comes to ensuring a consistent and reliable water supply in your mobile or off-grid applications, Seaflo pumps stand out as a premier choice. Designed to deliver efficient water flow and pressure, these pumps are widely utilised in everything from recreational vehicles (RVs) and caravans to yachts and various industrial spraying systems. Understanding the different types of Seaflo pumps and their unique features is key to selecting the right model for your specific needs, ensuring optimal performance and longevity for your water system.
- Understanding Seaflo Diaphragm Pumps
- Seaflo Variable Speed Smart Pumps (56A, 56C Series)
- Comparing Standard and Variable Speed Seaflo Pumps
- Installation Considerations for Seaflo Pumps
- Frequently Asked Questions (FAQs)
- What is a Seaflo pump?
- What is the purpose of the bypass valve on a Seaflo pump?
- Can I adjust the pressure switch or bypass valve on my Seaflo pump myself?
- What's the main difference between a standard Seaflo pump and a variable speed one?
- Are Seaflo pumps self-priming and can they run dry?
- What types of applications are Seaflo pumps suitable for?
- Conclusion
Understanding Seaflo Diaphragm Pumps
Seaflo pumps, particularly the 51, 52, 52A, and 54 Series, are robust 5-chamber diaphragm pumps engineered for demanding applications. These pumps are renowned for their reliability and ease of use, providing a maximum pressure of 60 PSI and an open flow rate ranging from 3 to 5 GPM (Gallons Per Minute). A significant advantage of these models is their self-priming capability, meaning they can draw water from a source without needing to be pre-filled. Furthermore, they are designed to run dry without sustaining damage under normal workloads, offering peace of mind in various operational scenarios.
A core feature across many Seaflo pumps is their automatic operation. They are controlled by a pressure switch, which automatically starts the pump when a faucet or outlet is opened (causing a drop in pressure) and stops it when the faucet is closed (as pressure builds up). This intelligent design contributes to efficiency and conserves power by only running the pump when water is actively demanded.
The Role of the Bypass Valve in Seaflo Pumps
Certain Seaflo pump series, specifically the 52A-bypass version and the 54 Series, incorporate a sophisticated bypass valve. This innovative feature is crucial for maintaining smooth performance, especially as water demands fluctuate. Here's how it works:
- When water demand is high, such as when a faucet is fully open, the pump delivers its full water flow, and the bypass valve remains closed.
- However, when water demand is low or non-existent (e.g., a tap is partially open or closed), the bypass valve opens. This allows water to recirculate from the outlet side of the pump back to the inlet side.
The primary benefit of this recirculation is the significant reduction of rapid cycling. Without a bypass, a pump might frequently turn on and off in response to minor pressure changes, leading to increased wear and tear and noisy operation. The bypass valve ensures a steady flow of water within the pump, resulting in almost no cycling, a quieter operation, and reduced current draw, which collectively extends the pump's lifespan and enhances overall reliability.
Adjusting Standard Seaflo Pumps: Pressure Switch and Bypass Valve
Adjusting the pressure switch and bypass valve on Seaflo pumps is a task that requires precision and the right tools. While it is possible to perform these adjustments, it is strongly recommended that a professional technician undertakes this work using proper gauges and equipment. Incorrect adjustments can lead to improper pump operation or even damage.
Adjusting the Pump's Shut-Off Pressure:
The shut-off pressure determines at what point the pump will cease operation when water demand stops.
- To raise the shut-off pressure: Use a 2mm Allen wrench and turn the pressure switch screw clockwise to the desired pressure setting.
- To lower the shut-off pressure: Use a 2mm Allen wrench and turn the pressure switch screw counter-clockwise to the desired pressure setting.
Adjusting the Bypass Valve:
The bypass adjustment influences the pressure at which the bypass function activates and the full bypass pressure.
- To raise the pressure at which the bypass starts and raise the full bypass pressure: Use a 2mm Allen wrench and turn the bypass screw clockwise to the desired pressure.
- To lower the pressure at which the bypass starts and lower the full bypass pressure: Use a 2mm Allen wrench and turn the bypass screw counter-clockwise to the desired pressure.
CAUTION: A critical point to remember is that the pressure setting for full bypass must be at least 8 PSI higher than the pump's shut-off pressure. If these settings are too close, the bypass and switch shut-off can overlap, preventing the pump from shutting off entirely, which could lead to pump damage or excessive power consumption.
Key Features of Standard Seaflo Pumps (51, 52, 52A & 54 Series):
- 5-chamber diaphragm pump design
- Continuous duty capability
- Bypass function (52A-bypass version and 54 Series only) for reduced cycling
- Run dry capable for normal workloads
- Automatic operation controlled by pressure switch
- Industry standard mounting pattern for easy installation
- Self-priming functionality
- Quiet operation
- Ignition protected for safety
Common Applications:
- Yacht/RV/caravan pressurised water systems
- Sprayer fixtures (vehicle-mounted sprayers, electric sprayers)
- Cleaning machines
- Humidifiers
- Water purification systems
- Medical apparatus
- Food and beverage filling & liquid transfer
- Solar water systems
- Any other pressurisation system requiring reliable water transfer
Seaflo Variable Speed Smart Pumps (56A, 56C Series)
For those seeking an even more advanced and refined water pressure experience, Seaflo offers variable speed smart pumps, such as the 56A and 56C Series. These pumps represent a significant leap forward in water system technology, providing constant pressure across multiple outlets through integrated electronic controls. This innovative design eliminates the need for traditional pressurised tanks and separate pressure switches, simplifying plumbing and enhancing user experience.
The 5-chamber diaphragm and bypass technology found in these variable speed models further reduces cycling and significantly lowers operational noise. A new demand switch offers more precise control of pressure, ensuring stable performance, particularly with a low starting pressure. This protects the pump from frequent starts, which can contribute to wear. Furthermore, the switch is in direct contact with the liquid, facilitating good heat dissipation and preventing burnout, while also offering superior sealing performance.
Adjusting Variable Speed Pumps: Shut-Off Pressure & Bypass
Similar to standard models, variable speed pumps also allow for adjustment of shut-off pressure and bypass settings. Again, it is highly recommended to consult a professional technician for these adjustments to prevent damage or improper function.
Adjusting the Pump's Shut-Off Pressure:
- To raise the shut-off pressure: Use a 2mm Allen wrench to turn the pressure switch screw clockwise.
- To lower the shut-off pressure: Use a 2mm Allen wrench to turn the pressure switch screw counter-clockwise.
Adjusting the Bypass:
For variable speed models, the bypass valve access may be covered.
- Slide a screwdriver into the removal slot and pry out the bypass valve access hole cover.
- Locate the bypass valve adjustment screw on the pump housing at the bottom of the access hole.
- 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 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.
CAUTION: As with standard pumps, ensure the pressure setting for full bypass is at least 8 PSI higher than the shut-off pressure. Overlapping settings can lead to the pump not shutting off correctly.
Key Features of Seaflo Variable Speed Smart Pumps (56A, 56C Series):
- Variable speed technology for constant pressure
- 5-chamber diaphragm pump
- Can supply up to 4 fixtures simultaneously
- Industry standard mounting pattern
- Low voltage protection
- Quiet operation due to reduced cycling
- Long service life
- Ignition protected
- Safety bypass feature
- Self-priming capability
- Run dry safe
Common Applications:
- Yacht/RV/caravan pressurised water systems (ideal for multiple outlets)
- Sprayer fixtures (vehicle-mounted sprayers, electric sprayers)
- Solar water systems
- Any other pressurisation system requiring precise and stable pressure control
Comparing Standard and Variable Speed Seaflo Pumps
To help you decide which Seaflo pump is best suited for your requirements, here's a comparative overview:
| Feature | Standard Seaflo Pumps (e.g., 51, 52, 52A, 54 Series) | Variable Speed Seaflo Pumps (e.g., 56A, 56C Series) |
|---|---|---|
| Pressure Control | Automatic start/stop via pressure switch (on/off operation) | Constant pressure via integrated electronic controls |
| Cycling | Reduced cycling with bypass (52A-bypass, 54 Series); more cycling without bypass | Significantly reduced cycling due to variable speed and advanced bypass |
| Tank Requirement | Often benefits from a small accumulator tank to further reduce cycling | Eliminates the need for pressurised tanks |
| Noise Level | Generally quiet, bypass further reduces noise | Very quiet due to smooth, continuous operation |
| Flow Rate | Fixed flow rate when running | Variable flow rate to maintain constant pressure |
| Switch Technology | Micro cut-off pressure switch (52 Series), TTI cut-off switch (52A Series), Micro cut-off and bypass switch (54 Series) | New demand switch: precise control, stable performance, low starting pressure, good heat dissipation, better sealing |
| Complexity | Simpler mechanical operation | More advanced electronic control system |
| Cost | Generally lower initial cost | Higher initial cost, but offers enhanced user experience |
Installation Considerations for Seaflo Pumps
Proper installation is paramount for the optimal performance and longevity of any Seaflo pump. While the pumps are designed for durability, incorrect setup can lead to issues not covered by warranty. Always refer to the specific instruction manual for your model.
- Mounting: Pumps can generally be mounted in any position. If mounting vertically, position the pump head downwards to prevent potential leakage into the motor casing. Secure the feet firmly but avoid overtightening, as this can reduce their ability to dampen noise and vibration.
- Hosing: Use flexible, reinforced hose piping with a collapsing strength at least twice the inlet collapsing pressure. For 54 series, minimum 1/2" ID hose is recommended, while 52 series require 3/4" ID. Main distribution lines from the pump should also be 1/2" ID, with branch lines no smaller than 3/8" ID.
- Connections: Use stainless steel hose clamps and screws for secure connections. Teflon tape or sealant can be used on threaded fittings to prevent leaks. Avoid kinks or fittings that could restrict flow.
- Inlet Pressure: Do not apply inlet pressure exceeding 30 PSI. In general, try to avoid any inlet pressure completely if possible.
- Strainer: Always attach a strainer to the inlet side of the pump. This protects the pump from debris that could cause damage or blockages.
- Electrical: Ensure a proper electrical cut-off switch and fuse are installed in the circuit to protect the pump and your electrical system.
Frequently Asked Questions (FAQs)
What is a Seaflo pump?
A Seaflo pump is a type of electric diaphragm pump designed for transferring and pressurising water in various applications, commonly found in RVs, yachts, caravans, and industrial spraying systems. They are known for their reliability, self-priming ability, and capacity to run dry without damage.
What is the purpose of the bypass valve on a Seaflo pump?
The bypass valve, found on specific Seaflo series (like 52A-bypass and 54 Series), allows water to recirculate within the pump when demand is low. This feature significantly reduces rapid on/off cycling of the pump, leading to quieter operation, less wear and tear, and a more consistent, smoother water flow. It helps maintain a steady pressure without the pump constantly starting and stopping.
Can I adjust the pressure switch or bypass valve on my Seaflo pump myself?
While adjustment instructions are provided, it is strongly advised to have a professional technician perform these adjustments using appropriate gauges and equipment. Incorrect adjustment can lead to improper pump function, damage, or the pump failing to shut off, which is not covered by warranty.
What's the main difference between a standard Seaflo pump and a variable speed one?
The key difference lies in pressure control. Standard pumps operate on an on/off cycle based on a set pressure switch. Variable speed pumps, such as the 56A and 56C Series, use integrated electronic controls to maintain a constant pressure across all outlets, eliminating the need for a pressurised tank and providing a smoother, more consistent flow regardless of demand fluctuations. They also typically offer quieter operation and a longer service life due to reduced cycling.
Are Seaflo pumps self-priming and can they run dry?
Yes, all the Seaflo pump series discussed (51, 52, 52A, 54, 56A, 56C) are self-priming, meaning they can draw water into the pump without needing to be manually filled first. They are also designed to run dry for normal workloads without sustaining damage, which is a significant advantage in many mobile and intermittent use applications.
What types of applications are Seaflo pumps suitable for?
Seaflo pumps are highly versatile and suitable for a wide range of applications, including pressurised water systems in yachts, RVs, and caravans, vehicle-mounted sprayers, electric sprayers, cleaning machines, humidifiers, water purification systems, medical apparatus, food and beverage filling, liquid transfer, and solar water systems. Their robust design makes them ideal for any system requiring reliable water pressurisation.
Conclusion
Seaflo pumps offer a reliable and efficient solution for water pressurisation in various settings. Whether you opt for a robust standard model with its effective bypass system or a cutting-edge variable speed pump for constant, unwavering pressure, Seaflo provides durable and high-performing options. Remember, proper installation and professional adjustment are key to unlocking the full potential and ensuring the longevity of your investment. By understanding the features and capabilities of these advanced pumps, you can confidently choose the right Seaflo model to meet your specific water system demands.
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