How to Adjust Booster Pump Pressure?
Booster systems are designed to operate within a specific pressure range to meet variable flow demands when mains pressure is insufficient. The pressure switch (pressostat) in these systems controls the pump’s start and stop pressures. Incorrect pressure adjustment can reduce pump performance and shorten the lifespan of system components.
When setting booster pressure, factors such as the pump’s performance curve, tank capacity, and application area (e.g., domestic systems, commercial buildings, or irrigation setups) should be considered. In this article, we’ll focus on how to properly adjust the pressure in domestic-type (household) booster systems from a technical perspective.
What Is Booster Pressure?
Booster pressure is the pressure created by a booster system to deliver water to the network or taps. This pressure ensures smooth water flow throughout the plumbing system, allowing water to reach all outlets — even in high-rise buildings or distant points — with sufficient force. Booster systems increase water pressure, enabling water to be transported over longer distances and to higher elevations.
Booster pressure must stay within specific limits.
- Low pressure may cause weak water flow from taps or insufficient delivery.
- Excessive pressure can damage the plumbing system, cause leaks at pipe joints, or break faucet fittings.
Therefore, correct pressure calibration is crucial to ensure both safe and efficient operation. Additionally, properly adjusted systems improve energy efficiency and prevent unnecessary power consumption.
Why Is Booster Pressure Adjustment Important?
- At low pressure: Water doesn’t reach fixtures efficiently, leading to discomfort and poor performance.
- At high pressure: Pipes, fittings, and devices may be damaged, and energy is wasted.
Proper pressure adjustment ensures efficient and safe system performance, guaranteeing both user comfort and long-term durability.
How to Adjust Booster Pressure
Pressure adjustment is typically done via the pressure switch (pressostat) located on the booster. The pressostat continuously monitors system pressure and activates or deactivates the pump based on preset limits. It maintains a stable range between the cut-in pressure (when the pump starts) and the cut-out pressure (when the pump stops).
A properly adjusted pressostat ensures steady water flow and prevents damage caused by overpressure. It also helps reduce energy waste, increasing system efficiency and service life.
How to Adjust the Pressostat
The pressostat usually has two main adjustment screws:
- Pressure Range Adjustment Screw (P):
Sets the lower (cut-in) pressure. Turning clockwise increases both the cut-in and cut-out pressures.
- Differential Pressure Adjustment Screw (ΔP):
Adjusts the difference between cut-in and cut-out pressures. Turning clockwise increases only the cut-out pressure while keeping the cut-in pressure constant.
Example:
- Cut-in pressure: 2 bar
- Cut-out pressure: 3.5 bar
In this case, the pump starts when pressure drops below 2 bar and stops when it reaches 3.5 bar.
Pressure Adjustment in Domestic Boosters
- For domestic (household) booster systems, follow these steps:
- When the pump is off, check the system pressure using the manometer on the tank.
- Check the tank’s air charge — it should be 0.2 bar lower than the system’s cut-in pressure (e.g., for a 2 bar cut-in pressure, the tank air should be 1.8 bar).
- Adjust the pressostat screws as needed.
Note: When checking the tank’s air pressure, make sure the system is depressurized and the booster is turned off.
Important Notes for Masdaf Boosters
Masdaf booster systems are factory-calibrated, and user intervention is not recommended. If the system shows abnormal behavior, contact an authorized service technician instead of adjusting it manually.
Additionally, pressure settings should always align with the pump’s characteristic curve, and the minimum permissible pressure must not be exceeded.
Conclusion
Proper booster pressure adjustment ensures efficient operation and extends system lifespan. If you suspect incorrect settings or are performing adjustments for the first time, refer to the user manual or contact an authorized service center. Incorrect settings can cause malfunctions or serious system damage.
With regular maintenance and routine checks, you can prevent major issues and maintain stable water pressure for consistent performance.