Thanks for all the VRV content! We had massive compressor failures at two VRF sites both different brands my former company installed them both. One of the field service reps found high static airhandlers were spec'd with low static duct and plus the airhandlers never had the airflow setup properly. Every ducted unit was moving too much air. EEV pulses were open way too far because the unit thought it needed more refrigerant based on sensors. Lots of shattered scroll plates on all the compressors these units run really hard in heat mode. Its interesting to hear how overcharge can effect these units. I'm guilty of gassing up VRF units just to get them by didn't realize it was that bad of a problem.
It is interesting to see how something we see as just normal practice can have such a huge impact on the overall health of the system! Makes you think differently about gassing it up on the fly! Thanks for watching!
Great rant. What do you think about situations where different versions of the OEM piping laying program gives different charge amount or even line sizes for the same inputs? It’s especially sticky in legal situations.
We have seen different versions of a certain OEM program give different outputs for the same inputs. I see your point about the manual, and I can also see how OEMs would love to say “follow the piping program output” but then say “the manual as shipped with the unit overrides all” when it’s their rear on the line.
What would be something to look for if you were getting too much liquid back to the compressor on daikin service checker? Or if you aren’t getting enough oil back?
Liquid back to the compressor is usually 2 things, refrigerant bypassing at a valve where it should be stopped or closed. Or insufficient heat exchange at a heat exchanger which could be airflow or restriction.
Im curious i built a system to what the design team had spec they didn't know i have some experience with webxpress so i took there as builts made my own with all the pipe runs for FC units and Mains all the piping checks outs but theres a orange boxs saying to up the 96k to a larger unit, now with being a 10 story building is upping the condensers need, they say no because noone will be running all at the same time at maximum but with the random weather cold ❄️ spells or heat domes would you want to have equipment capable of meeting those loads?
You always build out your indoor load and lengths then it auto populates your outdoor sizing. With that said I would be curious what length differences you have on your report compared to theirs that would up capacity. Sounds like something was overlooked
I do not disagree. Unfortunately most contractors have no clue what a VRV Xpress is, this goes back to making sure we are educating those installing the equipment and the importance of As Builts.
@@RomanBaugh Sometimes they magically appear after you spend 40 hours measuring a job. In any case I do agree the best way is to measure out a job . Thanks for the information.
Bang on mate. Another great video. Tom 🇬🇧
Thanks for all the VRV content!
We had massive compressor failures at two VRF sites both different brands my former company installed them both. One of the field service reps found high static airhandlers were spec'd with low static duct and plus the airhandlers never had the airflow setup properly. Every ducted unit was moving too much air. EEV pulses were open way too far because the unit thought it needed more refrigerant based on sensors. Lots of shattered scroll plates on all the compressors these units run really hard in heat mode.
Its interesting to hear how overcharge can effect these units. I'm guilty of gassing up VRF units just to get them by didn't realize it was that bad of a problem.
It is interesting to see how something we see as just normal practice can have such a huge impact on the overall health of the system! Makes you think differently about gassing it up on the fly! Thanks for watching!
Thanks ROMAN, To understand vrf better with your videoes
Anytime!
Great rant.
What do you think about situations where different versions of the OEM piping laying program gives different charge amount or even line sizes for the same inputs? It’s especially sticky in legal situations.
They typically do not contradict each other unless you are working out of 2 different versions of the program. The manual is still the bible.
We have seen different versions of a certain OEM program give different outputs for the same inputs. I see your point about the manual, and I can also see how OEMs would love to say “follow the piping program output” but then say “the manual as shipped with the unit overrides all” when it’s their rear on the line.
What would be something to look for if you were getting too much liquid back to the compressor on daikin service checker? Or if you aren’t getting enough oil back?
Liquid back to the compressor is usually 2 things, refrigerant bypassing at a valve where it should be stopped or closed. Or insufficient heat exchange at a heat exchanger which could be airflow or restriction.
Or wet operation from exp valve bleeding through when it's a 0pls
Im curious i built a system to what the design team had spec they didn't know i have some experience with webxpress so i took there as builts made my own with all the pipe runs for FC units and Mains all the piping checks outs but theres a orange boxs saying to up the 96k to a larger unit, now with being a 10 story building is upping the condensers need, they say no because noone will be running all at the same time at maximum but with the random weather cold ❄️ spells or heat domes would you want to have equipment capable of meeting those loads?
You always build out your indoor load and lengths then it auto populates your outdoor sizing. With that said I would be curious what length differences you have on your report compared to theirs that would up capacity. Sounds like something was overlooked
When a contractor installs the equipment the AS BUILTS are the key.
I do not disagree. Unfortunately most contractors have no clue what a VRV Xpress is, this goes back to making sure we are educating those installing the equipment and the importance of As Builts.
@@RomanBaugh Sometimes they magically appear after you spend 40 hours measuring a job. In any case I do agree the best way is to measure out a job . Thanks for the information.
Roman calling these dogs out! The people raging on these system becuase they got no idea how to work on them or install them
We all start some where when it comes to VRF, through training, repetition and dedication we can rise to the challenge
@RomanBaugh can you do a video on how you perform a vac on the vrv and what you use?