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Ductless System Install and Maintenance
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- Опубликовано: 24 ноя 2022
- Bert and Sam teach a class about ductless system install and maintenance practices. They particularly focus on wall-mounted mini-splits and do some flaring and cleaning prep demonstrations.
When installing a ductless system, you will need to think about the placement of the head, condenser, drain, line set, and high-voltage components. Before installation, it is best to review the scope of work, make sure you have all the necessary supplies in your van, read the manufacturer's manual, determine the placement of the components, and communicate all necessary information to the customer. It is also important to have appropriate PPE for procedures like cleaning and drilling, and you'll want to make sure you don't strain yourself while you work.
Flare joints are prone to leaking if we don't thoroughly test them, so we need to make sure we make flare connections that are tight and have strong copper. Make sure the copper has been deburred after being cut to avoid causing turbulence in the lines or creating ridges and cracks. You also want to use a high-quality flaring tool, whether you use a flaring block or power flaring tool; that way, the flare should have the proper diameter and depth. When torquing the flare nut, use a torque wrench set to the proper specs for the best results.
All line sets should also be insulated, though some technicians have reported that some sheaths may contribute to premature leaking. Cork tape and thumb gum are also inadequate for insulating ductless line sets. Pressure testing is also critical for identifying leaks early on. You will want to coat the joints in a bubble solution, wait for a little while, and make sure you inspect each joint with a flashlight and a mirror to check for microbubbles. Vacuum practices are very similar to the best practices for traditional split A/C units and heat pumps. The decay test can also help you realize that a system has a leak.
Ductless mini-splits usually have a relatively small charge compared to other types of systems. Be sure to follow the manufacturer's instructions and account for line length when setting the charge. You'll also want to make sure your condensate disposal methods are appropriate and working properly at the end of the installation. Generally, you will use either a gravity drain or a condensate pump. In many cases, gravity drains are ideal because they are quiet, have little maintenance compared to pumps, and have a lower chance of causing damage indoors. Condensate pumps may be the only feasible option when the unit is on an interior wall.
When you close out an installation, be sure to explain the most important aspects of equipment and remote operation, maintenance expectations, and condensate pump noise levels to the customer.
Regularly maintained ductless systems often don't take long to maintain, but they need attention to that they don't smelly and dirty quite quickly. PMs require you to talk to the customer and work inside their home, so customer service is critical. Ask the customer about their system, go over the scope of work with them, and show care for their home by wearing shoe covers and placing down drop clothes.
The maintenance process can be broken down into roughly five stages: pre-inspection, communicating issues, cleaning, confirming operation non-invasively, and having a closing conversation with the customer about what you did.
Before testing the system, let it run for at least 10 minutes. Then, do non-invasive testing, including checking the delta T. Watch out for things like low suction, ice on the expansion line, low split, or sloshing noises.
When it comes to cleaning, you will want to pull the filters and clean them with water. Try to wash condensers with water only unless they get impacted by soil, animal hair, or other debris. You'll probably have to expose the evaporator coil, drain pan, and blower wheel. You will likely need to remove the blower wheel for cleaning. When the evaporator coil is only a little bit dirty, you might use a rag or soft bristle brush, but you may need to clean the evaporator coil in place if there is significant soil. You can clean an evaporator coil in place using a bib kit.
To clean a gravity drain, flush and vacuum it and clean out the pan. You may need to remove the pan to access it. To clean a condensate pump, clean the reservoir, tubes, and screen, ensuring that the float is positioned correctly. Avoid using cleaners on pumps.
To finish up a maintenance job, make sure you leave the customer's home exactly how you found it. Check the make sure the system runs as it should. Communicate everything with the customer and allow them to raise questions or concerns.
Read all the tech tips, take the quizzes, and find our handy calculators at www.hvacrschool.com/.
thanks for the tips
Finally got it up and running. The only delays we had was because we realized we needed some extra parts (I’ll list that below) ruclips.net/user/postUgkxihMYiJNXcHdbH-7ihymsLz61l7jVyb5O . So we have a loft where our current hvac just couldn’t seem to keep cool during the summer. We have been using a window unit since we bought this house over 6 years ago (all the houses in this neighborhood were built in the 80’s and majority of the houses built like ours use a window unit). I hate window units because they are just so noisy and the one we had really only cools one side of the loft. I had contemplated upgrading our current HVAC, but with all the rising prices these days, it would take years before saving up enough to do that. With the advice of my father-in-law (used to run an HVAC business), he recommended we get an inverter instead. We thought we bought everything we needed, but there were just a few other parts we didn’t anticipate needing (which is what caused most of our delay). My friend and father-in-law did all the work to get it installed and running and now we have nice cool air circulating nicely throughout the entire loft. It is very quiet and even the outside unit is much quieter than our main HVAC unit. Saved ourselves thousands getting this.
I like how the class weighed in and wanted everything shown how to be done very thorough.and hats off to Bert for being patient and explaining it.good stuff
Thank you guys, you have no idea how long I’ve been wanting to watch a video like this!!! I get a little intimidated by mini splits since I don’t work on them on the regular basis and when I do get a service call for a mini split my minds goes crazy trying to think what’s wrong before I even get there lol. Thanks you sooo much for taking the time to make these awesome videos!!!
great stuff! making me a better hvac guy every video! thanks for sharing on youtube. paul
Great Class Bryan & Brett. Thank you.
36:32 - It makes sense to put this point here on the "Closing with the Customer" slide because this is where you talk about discussing what the customer can expect regarding maintenance of their system. You did right by putting that in here.
Very well detailed cleaning and tech tips.
Great job once again
Thank you. Very informative.
That was really good
Good going 👍
just a DIYer but learned a lot, thanks for the content
29:20 It's because there's trapped air in the ball valve seat, cycle the valve once or twice during a stage of high vacuum to solve this issue.
Thank you chalos from indonesia
Salam Alaykum, Muslim convert from USA. Looking to move to Indonesia inshallah. Was curious what states/provinces I could find a good amount of work in.
for a multi-head installation, beware gravity drains that get joined together before exiting the building. (don't do it). If two units have a gravity drain that is tied together (with a "t" for example) the single pipe that goes out of the building can not be used to suck the drain clear. If one of the units has a clogged drain, the normal clearing procedure of sucking (using a simple hand purpose built pump) on the exit/drain pipe outside the building will fail because the clear unit will prevent the sucking action from reaching the clogged unit. (At minute 1:01 in the video, the presenter recommends "blowing" from the outside to clear junk in the drain line....that can cause a cleaning problem if residue is blown inside the house....and a big cleanup problem if the installer has multiple heads on the outside drain line ... dirt will come out from all the heads inside the house!!...) Sucking on the drain line is the preferred way to clear junk from the line, but as I said at the outset. Don't let an installer hookup multiple drain lines from multiple heads into the same drain system from the house.... Each head should have its own drain line pipe to the outside of the house. One last thing: Outstanding presentation !!!... I thought the presenters (Sam and Bert) were terrific (I particularly liked Bert's humor ...(kinda reminded me of the old Bert and I recordings from Maine...:-) )
Thanks, for your video. Could you tell me which are the normal pressures readings for a 12000btu Mitsubishi mini split? Thank you in advance.
How do you take the cover off Fujitsu halcyon indoor unit for cleaning
Hello brain sir ..i mostly learn tips from this platform and like HVAC school...so i point is i generally weak in RAC & commercial types of system mainly in ductable wiring diagram.... please share or do a class in this catagory....my mostly complaints not complete because of my weakness in knowing wiring.....so that it....also my English is so so....so please lights on it.... thanks 🙏 for you have....
A blue light helps with mold issues. should come with each install.
I'm questioning the slide a 9:53. I was taught that putting a minislpit head over a door or window was bad. And I guess I never fully understood why.
Will manual explain size of condensation or gravity line setting
Where’s the 410A flare gauge size tester? How do we know the flare is the right size after flaring? If flare leaks are the most common call backs we gotta ensure they end up the right size. Even though our flare tools have a height gauge for the pipe, you would be surprised how much it doesn’t pass the gauge size test.. I’ve been using the manual tool from this brand with an orange pipe stopper.. slightly too much pressure or not enough not passing
Must be nice to gravity drain. Code here won’t allow it. All pumped. Pumps at least now have a fuse. I have had a pump fry and take out the board on the minisplit when it failed.
Gracias por darnos de sus conocimientos.
I mostly deals in installation maintenance AMC services....in new delhi.....
Where are install ductless before proposal, do you measure atmosphere and water column
What countries is my epa 608 good in?
👍
How do customers find right size of ductless
Install ductless wall and ceiling what is the measurement
Can use camera to find stud
Install ductless do it was delivered to txv or dtv
This can probably be condensed into a 45 m presentation. I found my self skipping through the chapters because of too much talking. A separate section on basic ops checks during PMs would be great.
If you have add to the line set in order to reach the indoor unit should One flare it, or is it okay to braze?
Flare it, unless you are in the real world, then braze it with best practices and you wouldn't have an issue
I am brazing it, I can guarantee you that.
Try to learn how to keep the camera in one position as much as possible
Let's make sure the power is off 30 minutes after the unit is in pieces. 😆 😆😆 not a fan of the bib.