difference between flushing and cleaning in professional machines

In professional heating and maintenance of hot water networks, we often encounter the terms flushing and cleaning, which many confuse, although technically they represent two distinct phases of the process. The difference lies in the fact that flushing is used to mechanically remove free dirt and sludge using water flow, while cleaning involves chemical or physical destruction of deposits and algae on pipe walls.

Physical principle of flushing vs. chemical destruction

Flushing is primarily a hydraulic process that uses the kinetic energy of flowing liquid to carry away free particles from the piping system. The aim is not to remove hardened deposits, but only to transport them to a filter or sump before starting a more aggressive step. Using the KAMMAK machine, we achieve this by creating sufficient pressure and flow rate that exceed the adhesion of free particles to the pipe surface.

On the other hand, cleaning is a more complex process that requires the application of chemical agents or high-pressure mechanical action to break down solid layers such as lime scale, iron oxide, or biological bacteria. While flushing is passive and depends on flow, cleaning actively changes the structure of deposits to make them transportable for subsequent flushing. Without this step, even the most powerful machine would not be able to restore full pipe permeability if the system is long-term clogged with hard scale.

Critical parameters: pressure, temperature, and time factor

The successful outcome depends on the correct setting of parameters, which differ in both processes. For effective flushing, a stable pressure and an average temperature of 40 to 50 degrees Celsius is sufficient, which ensures low water viscosity and better removal of fine fractions. However, during cleaning, the temperature must be increased above 70 °C to activate the chemical reactions of dissolving deposits, or higher pressure must be used for mechanical removal of layers.

• Flushing: Pressure 3-5 bar, temperature 40-50 °C, lasts about 15-20 minutes per circuit.
• Cleaning: Pressure 6-10 bar, temperature 70-90 °C, lasts 30-60 minutes with a chemical cycle.
• Chemical dosing: Added only during the cleaning phase, not during regular flushing.
• Stagnation period: After chemical dosing, the system must be left without flow for 1-2 hours.

Practical procedure for installation and connection to the distribution

During the installation of a professional machine, it is critical to connect it correctly to the water and sewer network to avoid mixing cleaning solutions with drinking water or damaging the sewer system. KAMMAK machines are designed to allow parallel connection of multiple heating branches, with each circuit needing to be isolated by valves for efficient flow control.

Proper preparation includes placing a coarse dirt filter before the machine inlet to prevent clogging of the pump chambers and checking the pressure valves on the outlet. When working with older systems, we recommend performing a short flush to remove free sludge before connecting the chemical pump for the cleaning phase. This procedure protects the internal parts of the machine from wear and prolongs its lifespan, which is crucial when investing in quality equipment.

Difference between stationary and portable solutions

The choice between a stationary and a portable model affects not only the logistics of work, but also the ability to achieve optimal cleaning parameters in different conditions. Stationary machines are intended for large buildings, where they can be permanently connected to installed pipelines and provide continuous performance with minimal risk of leakage, while portable versions are ideal for field repairs and smaller households.

Portable models often require manual water supply and have limited pump capacity, which can slow down the cleaning process in heavily clogged systems. On the other hand, stationary machines allow for more precise regulation of chemical dosing and temperature, which is absolutely necessary in demanding cases, such as removing biological film, to achieve the desired result.

Common operational errors and their consequences

The most common mistake when working with professional machines is attempting to clean without prior flushing, which leads to immediate clogging of filters and loss of time. Another problem is incorrect chemical dosing, when too much substance is used, which can corrode seals and metal parts of the system, or too little, which does not ensure the dissolution of deposits.

• Ignoring filtration: Feeding dirt directly into the pump will destroy it.
• Incorrect temperature: Too cold water does not activate chemicals, too hot water damages hoses.
• Inappropriate time: Premature termination of cleaning means that deposits remain in the system.
• Neglecting safety: Working without protective equipment when handling acids.

Visual differentiation: free sludge vs. solid layer

The diagram illustrates the key difference in particle adhesion – during flushing, particles are only on the surface and easily wash away, while during cleaning we must first mechanically or chemically break their bond with the pipe wall.

Hydraulic profile: laminar vs. turbulent flow

This graph shows that flushing often takes place at a lower speed (laminar flow), which is sufficient to carry away free particles, while effective cleaning requires a high flow speed creating turbulence capable of peeling deposits off the walls.

Frequently asked questions

How long does the complete cleaning and flushing process take?

The time required depends on the degree of contamination, but a typical cycle for an average family home takes approximately 3 to 4 hours, including preparation and final rinsing.

Can you use regular cleaning chemicals?

No, only specially approved chemicals intended for heating systems must be used in professional machines to avoid damaging the device material.

Why does foam appear during cleaning?

Foam is formed by the reaction of chemicals with organic impurities and is a sign that the cleaning process is proceeding correctly, although it needs to be regularly vented through a drain valve.

Understanding the difference between these two terms is key for every technician, as the correct sequence of steps ensures the efficiency of the entire process and protects your investment in the heating system. A proper understanding of this principle will allow you to choose optimal parameters for your specific KAMMAK machine model and avoid unnecessary malfunctions.

Do you have a question about this topic?

Having trouble deciding or dealing with a specific situation in your home? Write to us – we are happy to help.