Many modern Breezair evaporative air conditioners include an automatic drain system designed to improve water quality and reduce mineral buildup inside the unit.
One of the most common questions homeowners ask is:
“What should my Breezair drain setting be set to – 4 hours, 24 hours or 72 hours?”
While all three settings have their place, understanding how they work can help improve cooling performance, extend filter pad life and reduce maintenance issues.
What Does The Breezair Drain System Do?
Unlike older evaporative coolers that simply retained water inside the reservoir, many newer Breezair systems use a motorised drain valve.
The drain valve automatically empties water from the reservoir at scheduled intervals.
This process helps:
• Remove dirty water
• Reduce mineral buildup
• Improve water quality
• Protect filter pads
• Reduce mould growth
• Extend component life
The cleaner the water inside the unit, the better the evaporative cooler generally performs.
Why Water Quality Matters
Perth water contains naturally occurring minerals.
As water evaporates through the filter pads, these minerals remain behind and gradually become more concentrated inside the reservoir.
Without regular flushing, this can lead to:
• Scale buildup
• Sludge accumulation
• Reduced cooling efficiency
• Shorter filter pad life
• Increased maintenance requirements
The automatic drain system helps manage this process by periodically replacing old water with fresh water.
What Does The 4-Hour Setting Do?
The 4-hour setting causes the reservoir to drain more frequently.
This means:
• Cleaner water remains inside the unit
• Less scale buildup occurs
• Filter pads stay cleaner
• Reduced risk of mould and odours
• Improved overall water quality
Because water is replaced more often, mineral concentrations remain lower.
In our experience, the 4-hour setting is often the preferred option for maintaining cleaner water and helping protect the evaporative cooling system.
The trade-off is slightly higher water usage.
What Does The 24-Hour Setting Do?
The 24-hour setting drains the reservoir less frequently.
This setting:
• Uses less water
• Still provides regular flushing
• Offers a balance between maintenance and water consumption
Many homeowners use this setting successfully, particularly if the system is serviced regularly.
However, mineral concentrations will generally be higher than with the 4-hour setting.
What Does The 72-Hour Setting Do?
The 72-hour setting allows water to remain inside the reservoir for longer periods before being flushed.
Benefits include:
• Reduced water usage
• Fewer drain cycles
Potential disadvantages include:
• Higher mineral concentration
• Increased scale buildup
• More contamination inside the reservoir
• Faster filter pad deterioration
While this setting may be suitable in some circumstances, water quality inside the unit generally declines more quickly compared with shorter drain intervals.
Which Setting Is Best?
There is no single setting that is perfect for every household.
However, from a maintenance perspective, more frequent flushing generally results in cleaner water.
Many technicians prefer the 4-hour setting because:
• Water remains fresher
• Scale buildup is reduced
• Filter pads often last longer
• Mould growth is less likely
• Internal components remain cleaner
The slight increase in water usage is often outweighed by the maintenance benefits.
What About Salinity Settings?
Many Breezair models also include salinity control settings.
A salinity probe monitors the mineral content of the water inside the reservoir.
When salinity levels rise, the system can automatically dump water and replace it with fresh water.
Lower salinity settings generally:
• Dump water sooner
• Maintain cleaner water
• Reduce scale buildup
Higher salinity settings allow water to remain in the system longer before draining.
The combination of drain settings and salinity settings plays a major role in maintaining water quality.
Signs Your Drain System May Have A Problem
You may require servicing if:
• Water is not draining correctly
• Excessive scale is present
• The drain valve is stuck
• The unit smells unpleasant
• Cooling performance has declined
• Water remains in the reservoir for long periods
Faulty drain valves can prevent the automatic flushing system from working correctly.
Book A Breezair Service In Perth
If you’re unsure whether your Breezair drain settings are configured correctly, Air Legends can inspect the system and recommend the most suitable setup.
We service and repair Breezair evaporative coolers throughout Perth, including drain valve faults, salinity settings, filter pad inspections and annual maintenance.
Contact Air Legends today to arrange a professional Breezair service.