Freezing in HVAC Systems 3D
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- Опубліковано 5 лип 2023
- In this 3D video, we look at the causes and effects of freezing in HVAC systems (buildup of frost or ice on the equipment).
Water freezes at 32°F or 0°F. When a surface, such as an evaporator coil, is below water’s freezing point and contains moisture, frost or ice may form on that surface. In many cases, freezing in HVAC systems starts at the evaporator coil and works its way out; freezing can happen when the suction saturation temperature stays below 32°F for an extended period of time.
Some HVAC/R applications, such as commercial freezers and heat pumps in heating mode, need to operate under below-freezing conditions; the formation of frost or ice will hinder heat transfer over time, and periodic defrosting will be required. Evaporator coils in cooling mode should NOT freeze; when freezing happens, it will block system airflow. In general, evaporator coils will be about 35°F below the return air temperature.
The rate at which freezing occurs will depend on the amount of moisture in the air, the length of time at which the evaporator coil temperature is below freezing, the temperature of the return air, the air velocity, and the overall coil design.
When you encounter a frozen system, allow it to defrost completely before troubleshooting. You may allow the system to defrost by leaving it off with (or sometimes without) the blower running. In some cases, you may be able to use a heat gun or run the heat pump in heating mode for a short period. Be mindful of the water as the ice melts and take steps to prevent water damage.
A low evaporator coil temperature may be caused by low load (low airflow and/or low indoor temperature), refrigerant undercharge, low outdoor ambient temperatures, blower issues, and refrigerant side restrictions. We can prevent low load by advising customers not to set their thermostats below 72°F in cooling mode on standard equipment. We can also prevent low airflow from being a factor by making sure we replace dirty filters and clean the evaporator coil and blower wheels as necessary. When freezing happens due to a low refrigerant charge or a restriction, we may also notice high superheat; in humid climates, freezing of this nature can cause the entire system to freeze up.
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Great video and content. Thank you!
The fact that you put out free education with your own time is amazing. Hope Jesus blesses you and your family mightily.😊
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One more small note, when it comes to airflow, always check return air vents and make sure they're not blocked or extremely dirty, because then it's exactly like having a clogged filter
Great basic fundamentals that every HVAC tech needs when diagnosing a frozen evaporator coil.
Did a better job at helping me understand this than my instructor.
Thank you a lot for this channel.
The visuals in this video 🔥🔥🔥
Outstanding graphics presentation.
Awesome video thanks for your support
Thank you!
Thank you for this!
Great video presentation ❤
Thank you. For the Information.
Good info, Thanks Bryan.
Thankyou for the video. Please do more
Great information and very clear
Thanks!
Great Video
GREAT VIDEO THANK YOU.🥶
Thank you.😊
Magnificent
Thanks a lot for this video
Good video, good reminders. Straight to the point. Got sent to deal with a frozen rooftop commercial unit last week and everyone was scratching their heads (filter is good, right? Blower's moving, right? Got pressure right?). Meanwhile nobody bothered to clean the solid compacted dust on the indoor return grills, pulling so hard it was picking them up... But hey, that's why they pay me the big bucks on colorful paper. XD
I just want to say that I really appreciate all the advice and knowledge you give to us in your videos, and I can't thank you enough for taking the time to make ones like these (with all the animations). All hats off to you and your team. 🫡
great vid
I like your explanation good job.
I've asked this so many times but is this a software you are using or do you pay someone to create the video? I am an HVAC instructor and would love to make content like this for my class to cover specific lessons.
Yes I work with a professional 3D animator
Nicely Done! 🤝✌️
excellent
Just had this happen due to undersized copper tubing that wasn't replaced when the AC was updated. A nice little $1400 repair.
Very good
Just like they taught us-- back in 1972 !!!!
Nice work bro
Awesome video !!
Can you make and talk about diagnosing reversing valves ? Bypassing ?
What if you have 40 degree coil, 10 degree sub cool(txv) suction 126 liquid 312 but the suction line temp doesn’t goes below 68 f?
Does the coil temperature to air difference differ in refrigeration? I’m a refrigeration apprentice and was told the coil is 10-15° cooler than the space, but this video is saying it’s a 35° difference
My system freezes sometimes because the blower fails to start with the compressor. I have a split system. This can happen once or twice a month, specially during the monsoon season. I just turn off the system, wait to de-freeze and I am good for another couple of weeks until it happens again. Any ideas? Could it be the blower capacitor?
First art I assisted video?
❤
Why does low refrigerant cause this though? Just would like a better understanding of why low amount of refrigerant in the system would cause ice up
Low air flow also
🤍👍👍👍❤
THANK s