Ducted Split Pipe Freezing: Causes, Solutions, Preventing

Ducted split systems are one of the most widely used HVAC systems in residential and commercial buildings. By combining an outdoor compressor unit with an indoor air-handling unit, it efficiently provides cooling in summer and heating in winter, making it a popular choice among all users.

ducted split pipe freezing reasons

The Main Causes of Ducted Split Pipe Freezing

Typically, a pipe freezing issue is specific to the return pipe of the ducted split system and occurs during the cooling mode. This phenomenon usually happens when there is a malfunction in the refrigeration cycle or when airflow across the evaporator coil is restricted. As a result, the system’s efficiency drops, while compressor workload increases, potentially leading to severe damage over time.
Therefore, identifying the main causes of pipe freezing and addressing them promptly is crucial. Regular maintenance, cleaning of filters and coils, and checking refrigerant levels are essential preventive measures to avoid this problem and extend the system’s lifespan.

Low Refrigerant: Low refrigerant levels reduce pressure and coil temperature, causing the pipes to freeze.
Dirty Filters & Coils: Dirty filters and coils restrict airflow, leading to excessive cooling and pipe freezing.
Faulty Blower Fan: A faulty or weak blower fan disrupts heat exchange, causing excessive cooling and pipe freezing.
Blocked Ducts/Vents: Blocked ducts or vents restrict airflow, resulting in pipe freezing.
Operation in Very Cold Weather: Running the ducted split in very cold weather without a winter kit may cause pipe freezing.
Faulty Thermostat/Sensor: A faulty thermostat or temperature sensor prevents proper compressor cycling, causing freezing.
Refrigerant Line Blockage/Leak: Blockage in the capillary tube or expansion valve disrupts refrigerant flow, leading to freezing.

Solutions of Freezing Ducted Split Pipe

To solve the problem of ducted split pipe freezing, the first step is to accurately identify the root cause. If the refrigerant level is low, the system should be recharged with the correct amount after repairing any possible leaks. In cases where filters or coils are dirty, regular cleaning and replacing damaged filters will help restore proper airflow. It is also important to check the fans to ensure they are working efficiently to maintain correct heat exchange.

Additionally, thermostats and sensors should be inspected regularly and properly calibrated. If the issue is due to blocked air ducts or operating the system in very cold conditions, the ducts should be cleaned, or a suitable winter kit should be installed. Preventive maintenance and addressing minor issues early are the best ways to avoid major failures and extend the lifespan of the system.

How to Prevent Ducted Split Pipe from Freezing?

By observing a few points, you can prevent the split duct pipe from freezing. The first thing that can be done in this regard is to change the filter and clean the evaporator coil, and continuously control them. Another issue is to check the blower fan so that if it has a problem, it is replaced or the problem is fixed. One of the other things you can do to prevent the split duct return pipe from freezing is to ensure that the airflow inside the device is established. Also, if you use the device's fan mode when the weather is cold, you will avoid freezing. But in any case, after performing the above initial steps, it is better to contact the authorized after-sales service of your Ducted Split brand to solve this problem as soon as possible.

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The Final Word

Ducted split pipe freezing usually indicates a problem with the refrigeration system or airflow. Regular maintenance of filters, coils, fans, and refrigerant levels prevents this issue and extends the unit’s lifespan.
We hope that we have been able to provide useful information in this brief article. You can visit DamaTajhiz's specialized collection, such as DamaTajhiz ducted splits, mini chillers, cooling towers, etc. We are the first and most reliable specialized collection in Building facilities equipment and all air conditioners since 2004. You can also contact the experts of the DamaTajhiz air conditioning unit during office hours to get more information and get advice through the phone number +98-930-288-0251.

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